Structural Classification of Proteins

Class: Membrane and cell surface proteins and peptides

: Does not include proteins in the immune system

Lineage:

Root: scop
Class: Membrane and cell surface proteins and peptides [56835]
Does not include proteins in the immune system

Folds:

Toxins' membrane translocation domains [56836] (5)
multi-helical domains of various folds which is thought to unfold in the membrane
1. Colicin [56837] (1)
  uperfamily
  1. Colicin [56838] (4)
    contains "globin-like fold" with additional N-terminal and C-terminal helices
    1. Colicin A [56839]
      1. Escherichia coli [TaxId: 562] [56840] (1)
    2. Colicin B C-terminal domain [103421]
      1. Escherichia coli [TaxId: 562] [103422] (1)
    3. Colicin N [56841]
      contains an additional N-terminal a+b domain with six-stranded meander b-sheet
      1. Escherichia coli [TaxId: 562] [56842] (1)
    4. Colicin Ia [56843]
      the first ~450 residues are organized in coiled-coil structures
      1. Escherichia coli [TaxId: 562] [56844] (1)
2. Diphtheria toxin, middle domain [56845] (1)
  uperfamily
  1. Diphtheria toxin, middle domain [56846] (1)
    1. Diphtheria toxin, middle domain [56847]
      contains globin-like fold with two additional helices at N-termini but has no counterpart to the first globin helix (A)
      1. Corynebacterium diphtheriae [TaxId: 1717] [56848] (6)
3. delta-Endotoxin (insectocide), N-terminal domain [56849] (1)
  uperfamily
  1. delta-Endotoxin (insectocide), N-terminal domain [56850] (4)
    seven-helical bundle with central helix surrounded by six others
    1. delta-Endotoxin (insectocide), N-terminal domain [56851]
      1. Bacillus thuringiensis tenebrionis, CRYIIIA (BT13) [TaxId: 1444] [56852] (1)
      2. Bacillus thuringiensis, CRY3bb1 [TaxId: 1428] [64522] (1)
      3. Bacillus thuringiensis, CRYIA (A) [TaxId: 1428] [56853] (1)
      4. Bacillus thuringiensis subsp. kurstaki, CRY2AA [TaxId: 29339] [64523] (1)
4. Bcl-2 inhibitors of programmed cell death [56854] (1)
  PROVISIONAL CLASSIFICATION, based on structural similarity to the diphtheria toxin domain
  uperfamily
  1. Bcl-2 inhibitors of programmed cell death [56855] (13)
    Pfam 00452
    1. Bcl-2 [64524]
      1. Human (Homo sapiens) [TaxId: 9606] [64525] (5)
    2. Apoptosis regulator Bcl-xL [56856]
      1. Human (Homo sapiens) [TaxId: 9606] [56857] (15)
      2. Mouse (Mus musculus) [TaxId: 10090] [103423] (3)
      3. Rat (Rattus norvegicus) [TaxId: 10116] [56858] (1)
    3. Apoptosis regulator Bcl-w [90103]
      1. Human (Homo sapiens) [TaxId: 9606] [90104] (3)
    4. Proapoptotic molecule Bid [56859]
      1. Human (Homo sapiens) [TaxId: 9606] [56860] (1)
      2. Mouse (Mus musculus) [TaxId: 10090] [56861] (1)
    5. Proapoptotic molecule Bax [56862]
      1. Human (Homo sapiens) [TaxId: 9606] [56863] (2)
    6. Bcl-2 homolog [75637]
      1. Kaposi's sarcoma-associated herpesvirus [TaxId: 37296] [75638] (1)
    7. Apoptosis regulator ced-9 [103424]
      1. Nematode (Caenorhabditis elegans) [TaxId: 6239] [103425] (3)
        SQ P41958 74-237
    8. Early antigen protein R [103426]
      1. Epstein-Barr virus [TaxId: 10376] [103427] (1)
    9. EAT/MCL-1 (Myeloid cell leukemia sequence 1) [118212]
      1. Mouse (Mus musculus) [TaxId: 10090] [118213] (4)
        SQ P97287 152-308
    10. Bcl-2 homolog V-bcl-2 [144081]
      1. Murid herpesvirus 4 [TaxId: 33708] [144082] (5)
        SQ P89884 6-136
5. Exotoxin A, middle domain [56864] (1)
  uperfamily
  1. Exotoxin A, middle domain [56865] (1)
    1. Exotoxin A, middle domain [56866]
      six-helical domain
      1. Pseudomonas aeruginosa [TaxId: 287] [56867] (2)
Family A G protein-coupled receptor-like [81322] (1)
core: up-and-down bundle of seven transmembrane helices tilted 20 degrees with respect to the plane of the membrane
1. Family A G protein-coupled receptor-like [81321] (2)
  uperfamily
  1. Bacteriorhodopsin-like [81319] (6)
    1. Bacteriorhodopsin [56871]
      a light-driven proton pump
      1. Archaeon Halobacterium halobium [TaxId: 2242] [56872] (3)
      2. Archaeon Halobacterium salinarum [TaxId: 2242] [56873] (60)
        SQ P02945 17-245
    2. Archaerhodopsin-1 [90105]
      1. Archaeon Halobacterium sp. [TaxId: 2243] [90106] (1)
    3. Halorhodopsin [56874]
      a light-driven chloride pump
      1. Archaeon Halobacterium salinarum [TaxId: 2242] [56875] (1)
    4. Sensory rhodopsin II [64526]
      1. Archaeon Natronobacterium pharaonis [TaxId: 2257] [64527] (7)
    5. Sensory rhodopsin [118224]
      1. Anabaena sp. PCC 7120 [TaxId: 103690] [118225] (1)
        SQ Q8YSC4 # alr3165
  2. Rhodopsin-like [81320] (1)
    Individual TM segments have a number of kinks and distortions
    1. Rhodopsin [56876]
      1. Cow (Bos taurus) [TaxId: 9913] [56877] (12)
        SQ P02699
Single transmembrane helix [81407] (38)
not a true fold
1. Photosystem II reaction centre subunit H, transmembrane region [81490] (1)
  uperfamily
  1. Photosystem II reaction centre subunit H, transmembrane region [81489] (3)
    1. Photosystem II reaction centre subunit H, transmembrane region [81488]
      1. Rhodopseudomonas viridis [TaxId: 1079] [81485] (11)
        synonym: blastochloris viridis
      2. Rhodobacter sphaeroides [TaxId: 1063] [81486] (39)
        SQ P11846
      3. Thermochromatium tepidum [TaxId: 1050] [81487] (1)
2. Mitochondrial cytochrome c oxidase subunit IV [81406] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit IV [81405] (1)
    1. Mitochondrial cytochrome c oxidase subunit IV [81404]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81403] (21)
3. Mitochondrial cytochrome c oxidase subunit VIa [81411] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIa [81410] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIa [81409]
      probably responsible for the dimerization of the mitochondrial cytochrome c oxidase
      1. Cow (Bos taurus) [TaxId: 9913] [81408] (21)
4. Mitochondrial cytochrome c oxidase subunit VIc [81415] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIc [81414] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIc [81413]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81412] (21)
5. Mitochondrial cytochrome c oxidase subunit VIIa [81419] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIIa [81418] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIIa [81417]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81416] (21)
6. Mitochondrial cytochrome c oxidase subunit VIIb [81423] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIIb [81422] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIIb [81421]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81420] (21)
7. Mitochondrial cytochrome c oxidase subunit VIIc (aka VIIIa) [81427] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIIc (aka VIIIa) [81426] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIIc (aka VIIIa) [81425]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81424] (21)
8. Mitochondrial cytochrome c oxidase subunit VIIIb (aka IX) [81431] (1)
  uperfamily
  1. Mitochondrial cytochrome c oxidase subunit VIIIb (aka IX) [81430] (1)
    1. Mitochondrial cytochrome c oxidase subunit VIIIb (aka IX) [81429]
      function unknown, probably acts as a regulator or is required for the assembly
      1. Cow (Bos taurus) [TaxId: 9913] [81428] (21)
9. Bacterial aa3 type cytochrome c oxidase subunit IV [81469] (1)
  uperfamily
  1. Bacterial aa3 type cytochrome c oxidase subunit IV [81468] (2)
    1. Bacterial aa3 type cytochrome c oxidase subunit IV [81467]
      interacts with subunit I and III, function unknown, non-essential for the enzymatic activity
      1. Paracoccus denitrificans [TaxId: 266] [81465] (1)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81466] (2)
10. Bacterial ba3 type cytochrome c oxidase subunit IIa [81473] (1)
  uperfamily
  1. Bacterial ba3 type cytochrome c oxidase subunit IIa [81472] (1)
    1. Bacterial ba3 type cytochrome c oxidase subunit IIa [81471]
      functionally important, corresponds to the first helix of the aa3 type subunit II absent in the ba3 type subunit II
      1. Thermus thermophilus [TaxId: 274] [81470] (5)
11. F1F0 ATP synthase subunit B, membrane domain [81573] (1)
  uperfamily
  1. F1F0 ATP synthase subunit B, membrane domain [81572] (1)
    1. F1F0 ATP synthase subunit B, membrane domain [81571]
      1. Escherichia coli [TaxId: 562] [81570] (1)
12. Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor [81496] (1)
  uperfamily
  1. Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor [81495] (3)
    1. Cytochrome c1 subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane anchor [81494]
      1. Cow (Bos taurus) [TaxId: 9913] [81491] (19)
        SQ P00125
      2. Chicken (Gallus gallus) [TaxId: 9031] [81492] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81493] (9)
13. ISP transmembrane anchor [81502] (1)
  uperfamily
  1. ISP transmembrane anchor [81501] (5)
    1. Iron-sulfur subunit (ISP) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase), transmembrane region [81500]
      1. Cow (Bos taurus) [TaxId: 9913] [81497] (13)
        SQ P13272; precursor of chains I,E and V,R
      2. Chicken (Gallus gallus) [TaxId: 9031] [81498] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81499] (9)
    2. ISP subunit from the cytochrome b6f complex, transmembrane anchor [103428]
      1. Mastigocladus laminosus [TaxId: 83541] [103429] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103430] (1)
14. Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81508] (1)
  uperfamily
  1. Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81507] (3)
    1. Ubiquinone-binding protein QP-C of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81506]
      together with cytochrome b binds to ubiquinone
      1. Cow (Bos taurus) [TaxId: 9913] [81503] (19)
        SQ P13271 #SP ! SQ P13271
      2. Chicken (Gallus gallus) [TaxId: 9031] [81504] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81505] (9)
15. Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81514] (1)
  uperfamily
  1. Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81513] (3)
    1. Subunit X (non-heme 7 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81512]
      interacts with cytochrome c1 and ISP
      1. Cow (Bos taurus) [TaxId: 9913] [81509] (18)
        SQ P00130
      2. Chicken (Gallus gallus) [TaxId: 9031] [81510] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81511] (9)
16. Subunit XI (6.4 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81518] (1)
  uperfamily
  1. Subunit XI (6.4 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81517] (1)
    1. Subunit XI (6.4 kDa protein) of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81516]
      the smallest subunit of the complex, interacts with subunit 10 and ISP, peripherally located
      1. Cow (Bos taurus) [TaxId: 9913] [81515] (15)
        SQ P07552
17. Subunit III of photosystem I reaction centre, PsaF [81536] (1)
  uperfamily
  1. Subunit III of photosystem I reaction centre, PsaF [81535] (1)
    1. Subunit III of photosystem I reaction centre, PsaF [81534]
      1. Synechococcus elongatus [TaxId: 32046] [81533] (1)
18. Subunit VIII of photosystem I reaction centre, PsaI [81540] (1)
  uperfamily
  1. Subunit VIII of photosystem I reaction centre, PsaI [81539] (1)
    1. Subunit VIII of photosystem I reaction centre, PsaI [81538]
      1. Synechococcus elongatus [TaxId: 32046] [81537] (1)
19. Subunit IX of photosystem I reaction centre, PsaJ [81544] (1)
  uperfamily
  1. Subunit IX of photosystem I reaction centre, PsaJ [81543] (1)
    1. Subunit IX of photosystem I reaction centre, PsaJ [81542]
      1. Synechococcus elongatus [TaxId: 32046] [81541] (1)
20. Subunit XII of photosystem I reaction centre, PsaM [81548] (1)
  uperfamily
  1. Subunit XII of photosystem I reaction centre, PsaM [81547] (1)
    1. Subunit XII of photosystem I reaction centre, PsaM [81546]
      1. Synechococcus elongatus [TaxId: 32046] [81545] (1)
21. Subunit PsaX of photosystem I reaction centre [81552] (1)
  uperfamily
  1. Subunit PsaX of photosystem I reaction centre [81551] (1)
    1. Subunit PsaX of photosystem I reaction centre [81550]
      1. Synechococcus elongatus [TaxId: 32046] [81549] (1)
22. Iron-sulfur subunit of formate dehydrogenase N, transmembrane anchor [81597] (1)
  uperfamily
  1. Iron-sulfur subunit of formate dehydrogenase N, transmembrane anchor [81596] (1)
    1. Iron-sulfur subunit of formate dehydrogenase N, transmembrane anchor [81595]
      1. Escherichia coli [TaxId: 562] [81594] (2)
23. Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor [103431] (1)
  uperfamily
  1. Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor [103432] (2)
    1. Cytochrome f subunit of the cytochrome b6f complex, transmembrane anchor [103433]
      1. Mastigocladus laminosus [TaxId: 83541] [103434] (1)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103435] (1)
24. PetL subunit of the cytochrome b6f complex [103436] (1)
  uperfamily
  1. PetL subunit of the cytochrome b6f complex [103437] (2)
    1. PetL subunit of the cytochrome b6f complex [103438]
      1. Mastigocladus laminosus [TaxId: 83541] [103439] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103440] (1)
25. PetM subunit of the cytochrome b6f complex [103441] (1)
  uperfamily
  1. PetM subunit of the cytochrome b6f complex [103442] (2)
    1. PetM subunit of the cytochrome b6f complex [103443]
      1. Mastigocladus laminosus [TaxId: 83541] [103444] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103445] (1)
26. PetG subunit of the cytochrome b6f complex [103446] (1)
  uperfamily
  1. PetG subunit of the cytochrome b6f complex [103447] (2)
    1. PetG subunit of the cytochrome b6f complex [103448]
      1. Mastigocladus laminosus [TaxId: 83541] [103449] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103450] (1)
27. PetN subunit of the cytochrome b6f complex [103451] (1)
  uperfamily
  1. PetN subunit of the cytochrome b6f complex [103452] (2)
    1. PetN subunit of the cytochrome b6f complex [103453]
      1. Mastigocladus laminosus [TaxId: 83541] [103454] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103455] (1)
28. Preprotein translocase SecE subunit [103456] (1)
  uperfamily
  1. Preprotein translocase SecE subunit [103457] (2)
    1. Preprotein translocase SecE subunit [103458]
      1. Archaeon Methanococcus jannaschii [TaxId: 2190] [103459] (4)
      2. Canis lupus familiaris [TaxId: 9615] [161015] (1)
29. Sec-beta subunit [103460] (1)
  uperfamily
  1. Sec-beta subunit [103461] (2)
    1. Sec-beta subunit [103462]
      1. Archaeon Methanococcus jannaschii [TaxId: 2190] [103463] (4)
      2. Canis lupus familiaris [TaxId: 9615] [161016] (1)
30. Oligosaccharyltransferase subunit ost4p [103464] (1)
  uperfamily
  1. Oligosaccharyltransferase subunit ost4p [103465] (1)
    1. Oligosaccharyltransferase subunit ost4p [103466]
      1. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [103467] (1)
31. Photosystem II reaction center protein L, PsbL [161017] (1)
  1. PsbL-like [161018] (1)
    Pfam 02419
    1. Photosystem II reaction center protein L, PsbL [161019]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161020] (1)
        SQ Q8DIN8 1-37
32. Photosystem II reaction center protein J, PsbJ [161021] (1)
  1. PsbJ-like [161022] (1)
    Pfam 01788
    1. Photosystem II reaction center protein J, PsbJ [161023]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161024] (1)
        SQ P59087 7-40
33. Photosystem II 10 kDa phosphoprotein PsbH [161025] (1)
  1. PsbH-like [161026] (1)
    Pfam 00737
    1. Photosystem II reaction center protein H, PsbH [161027]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161028] (1)
        SQ Q8DJ43 2-65
34. Photosystem II reaction center protein T, PsbT [161029] (1)
  1. PsbT-like [161030] (1)
    Pfam 01405
    1. Photosystem II reaction center protein T, PsbT [161031]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161032] (1)
        SQ Q8DIQ0 1-30
35. Photosystem II reaction center protein M, PsbM [161033] (1)
  1. PsbM-like [161034] (1)
    Pfam 05151
    1. Photosystem II reaction center protein M, PsbM [161035]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161036] (1)
        SQ Q8DHA7 1-36
36. Photosystem II reaction center protein K, PsbK [161037] (1)
  1. PsbK-like [161038] (1)
    Pfam 02533
    1. Photosystem II reaction center protein K, PsbK [161039]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161040] (1)
        SQ Q9F1K9 10-46
37. Photosystem II reaction center protein I, PsbI [161041] (1)
  1. PsbI-like [161042] (1)
    Pfam 02532
    1. Photosystem II reaction center protein I, PsbI [161043]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161044] (1)
        SQ Q8DJZ6 1-35
38. Cytochrome b559 subunits [161045] (1)
  1. Cytochrome b559 subunits [161046] (2)
    Pfam 00283 comprises PsbF beta subunit (PsbF) and the transmembrane helix of alpha subunit (PsbE) that bind one heme group between them; the lumenal region of the alpha subunit is covered by Pfam 00284
    1. Cytochrome b559 subunit alpha, PsbE [161047]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161048] (1)
        SQ Q8DIP0 3-84
    2. Cytochrome b559 subunit beta, PsbF [161049]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161050] (1)
        SQ Q8DIN9 11-45
Bacterial photosystem II reaction centre, L and M subunits [81484] (1)
five transmembrane helices forming a sheet-like structure
1. Bacterial photosystem II reaction centre, L and M subunits [81483] (1)
  uperfamily
  1. Bacterial photosystem II reaction centre, L and M subunits [81482] (8)
    L and M are probably related to each other
    1. L (light) subunit [81477]
      1. Rhodopseudomonas viridis [TaxId: 1079] [81474] (11)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81475] (67)
        SQ P02954
      3. Thermochromatium tepidum [TaxId: 1050] [81476] (1)
    2. M (medium) subunit [81481]
      1. Rhodopseudomonas viridis [TaxId: 1079] [81478] (11)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81479] (65)
        SQ P02953
      3. Thermochromatium tepidum [TaxId: 1050] [81480] (1)
    3. Photosystem II reaction center d2 protein PsbD2 [161051]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161052] (1)
        SQ Q8CM25 13-352
    4. Photosystem Q(B) protein 1, PsbA1 [161053]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161054] (1)
        SQ P0A445 10-344
Cytochrome c oxidase subunit I-like [81443] (1)
12 transmembrane helices in an approximate threefold rotational symmetric arrangement
1. Cytochrome c oxidase subunit I-like [81442] (1)
  uperfamily
  1. Cytochrome c oxidase subunit I-like [81441] (5)
    the largest and best conserved subunit, contains two heme groups, low spin heme a and high spin heme a3
    1. Mitochondrial cytochrome c oxidase, subunit I [81433]
      1. Cow (Bos taurus) [TaxId: 9913] [81432] (21)
    2. Bacterial aa3 type cytochrome c oxidase subunit I [81436]
      1. Paracoccus denitrificans [TaxId: 266] [81434] (2)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81435] (6)
    3. Bacterial ba3 type cytochrome c oxidase subunit I [81438]
      1. Thermus thermophilus [TaxId: 274] [81437] (2)
    4. Cytochrome O ubiquinol oxidase, subunit I [81440]
      1. Escherichia coli [TaxId: 562] [81439] (1)
Cytochrome c oxidase subunit III-like [81453] (1)
core: 7 transmembrane helices organized into two bundles, one formed by the first two helices and the other by the rest
1. Cytochrome c oxidase subunit III-like [81452] (1)
  uperfamily
  1. Cytochrome c oxidase subunit III-like [81451] (4)
    function unknown, possibly involved in the assembly or form the entrance to "oxygen" channel
    1. Mitochondrial cytochrome c oxidase, subunit III [81445]
      1. Cow (Bos taurus) [TaxId: 9913] [81444] (21)
    2. Bacterial aa3 type cytochrome c oxidase subunit III [81448]
      1. Paracoccus denitrificans [TaxId: 266] [81446] (1)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81447] (2)
    3. Cytochrome O ubiquinol oxidase, subunit III [81450]
      1. Escherichia coli [TaxId: 562] [81449] (1)
Transmembrane helix hairpin [81334] (5)
two antiparallel transmembrane helices
1. Cytochrome c oxidase subunit II-like, transmembrane region [81464] (1)
  uperfamily
  1. Cytochrome c oxidase subunit II-like, transmembrane region [81463] (5)
    1. Mitochondrial cytochrome c oxidase, subunit II [81455]
      1. Cow (Bos taurus) [TaxId: 9913] [81454] (21)
    2. Bacterial aa3 type cytochrome c oxidase subunit II [81458]
      1. Paracoccus denitrificans [TaxId: 266] [81456] (3)
      2. Rhodobacter sphaeroides [TaxId: 1063] [81457] (6)
    3. Bacterial ba3 type cytochrome c oxidase subunit II [81460]
      1. Thermus thermophilus [TaxId: 274] [81459] (5)
        the "missing" first helix is complemented by the ba3 subunit IIa
    4. Cytochrome O ubiquinol oxidase, subunit II [81462]
      1. Escherichia coli [TaxId: 562] [81461] (1)
2. F1F0 ATP synthase subunit C [81333] (1)
  uperfamily
  1. F1F0 ATP synthase subunit C [81332] (1)
    1. F1F0 ATP synthase subunit C [56891]
      1. Escherichia coli [TaxId: 562] [56892] (6)
3. Magnesium transport protein CorA, transmembrane region [144083] (1)
  forms homopentameric channel
  uperfamily
  1. Magnesium transport protein CorA, transmembrane region [144084] (1)
    C-terminal part of Pfam 01544
    1. Magnesium transport protein CorA [144085]
      1. Thermotoga maritima [TaxId: 2336] [144086] (20)
        SQ Q9WZ31 286-349
4. Htr2 transmembrane domain-like [158212] (1)
  1. Htr2 transmembrane domain-like [158213] (1)
    1. Sensory rhodopsin II transducer, Htr2 [158214]
      1. Natronomonas pharaonis [TaxId: 2257] [158215] (3)
        SQ P42259 27-79! SQ P42259 29-79
5. PsbZ-like [161055] (1)
  1. PsbZ-like [161056] (1)
    Pfam 01737; Ycf9
    1. Photosystem II reaction center protein Z, PsbZ [161057]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161058] (1)
        SQ Q8DHJ2 1-62
F1F0 ATP synthase subunit A [81337] (1)
core: up-and-down bundle of four transmembrane helices
1. F1F0 ATP synthase subunit A [81336] (1)
  uperfamily
  1. F1F0 ATP synthase subunit A [81335] (1)
    1. F1F0 ATP synthase subunit A [56893]
      1. Escherichia coli [TaxId: 562] [56894] (1)
ATP synthase B chain-like [161059] (1)
long single helix, part of the stator subcomplex
1. ATP synthase B chain-like [161060] (1)
  1. ATP synthase B chain-like [161061] (1)
    Pfam 05405
    1. ATP synthase subunit b, mitochondrial [161062]
      1. Cow (Bos taurus) [TaxId: 9913] [161063] (2)
        SQ P13619 121-225
ATP synthase D chain-like [161064] (1)
non-globular, mostly helical component of the stator subcomplex
1. ATP synthase D chain-like [161065] (1)
  1. ATP synthase D chain-like [161066] (1)
    Pfam 05873
    1. ATP synthase subunit d, mitochondrial [161067]
      1. Cow (Bos taurus) [TaxId: 9913] [161068] (2)
        SQ P13620 4-123
Aquaporin-like [81339] (1)
core: 8 helices, 2 short helices are surrounded by 6 long transmembrane helices
1. Aquaporin-like [81338] (1)
  uperfamily
  1. Aquaporin-like [56895] (6)
    duplication: consist of two similar structural parts
    1. Aquaporin-1 [56896]
      1. Human (Homo sapiens) [TaxId: 9606] [56897] (3)
      2. Cow (Bos taurus) [TaxId: 9913] [75642] (1)
    2. Aquaporin-0 [103468]
      1. Sheep (Ovis aries) [TaxId: 9940] [103469] (2)
      2. Cow (Bos taurus) [TaxId: 9913] [118226] (3)
        SQ P06624
    3. Aquaporin Z [103470]
      1. Escherichia coli [TaxId: 562] [103471] (9)
    4. Glycerol uptake facilitator protein GlpF [56898]
      glycerol conducting channel, related to aquaporin
      1. Escherichia coli [TaxId: 562] [56899] (4)
Ammonium transporter [111351] (1)
11 transmembrane helices; duplication: consist of 2 structural repeats of five helices each plus extra C-terminal helix
1. Ammonium transporter [111352] (1)
  uperfamily
  1. Ammonium transporter [111353] (1)
    Pfam 00909
    1. Ammonium transporter AmtB [111354]
      1. Escherichia coli [TaxId: 562] [111355] (15)
        SQ P37905 2-407
MFS general substrate transporter [103472] (1)
12 transmembrane helices; duplication: the N- and C-terminal halves are structurally similar
1. MFS general substrate transporter [103473] (2)
  uperfamily
  1. Glycerol-3-phosphate transporter [103474] (1)
    1. Glycerol-3-phosphate transporter [103475]
      1. Escherichia coli [TaxId: 562] [103476] (1)
  2. LacY-like proton/sugar symporter [103477] (1)
    1. Lactose permease [103478]
      1. Escherichia coli [TaxId: 562] [103479] (4)
SNF-like [161069] (1)
12 transmembrane helices; duplication: consists of two structurally similar halves
1. SNF-like [161070] (1)
  1. SNF-like [161071] (1)
    Pfam 00209; Sodium:neurotransmitter symporter
    1. Na(+):neurotransmitter symporter homologue LeuT [161072]
      1. Aquifex aeolicus [TaxId: 63363] [161073] (5)
        SQ O67854 5-513
Proton glutamate symport protein [118214] (1)
multihelical membrane protein; partial structural duplication in the C-terminal region; oligomeric state: trimer
1. Proton glutamate symport protein [118215] (1)
  uperfamily
  1. Proton glutamate symport protein [118216] (1)
    1. Proton glutamate symport protein [118217]
      1. Pyrococcus horikoshii [TaxId: 53953] [118218] (7)
        SQ O59010 # PH1295
Clc chloride channel [81341] (1)
core: 18 transmembrane helices
1. Clc chloride channel [81340] (1)
  uperfamily
  1. Clc chloride channel [69912] (2)
    duplication: consist of two similar structural parts
    1. Clc chloride channel [69913]
      1. Escherichia coli [TaxId: 562] [69914] (32)
      2. Salmonella typhimurium [TaxId: 90371] [69915] (1)
Voltage-gated potassium channels [81325] (1)
oligomeric transmembrane alpha-helical proteins
1. Voltage-gated potassium channels [81324] (1)
  uperfamily
  1. Voltage-gated potassium channels [81323] (6)
    1. Potassium channel protein [56901]
      1. Streptomyces coelicolor [TaxId: 1902] [56902] (34)
        identical sequence to Streptomyces lividans, TaxId: 1916
        SQ Q54397 22-124
      2. Streptomyces lividans [TaxId: 1916] [161074] (5)
    2. Potassium channel-related protein MthK [75643]
      calcium gated potassium channel
      1. Archaeon Methanothermobacter thermautotrophicus [TaxId: 145262] [75644] (1)
    3. Potassium channel KVAP [90107]
      1. Archaeon Aeropyrum pernix [TaxId: 56636] [90108] (4)
    4. Inward rectifier potassium channel Kirbac1.1 [90109]
      1. Burkholderia pseudomallei [TaxId: 28450] [90110] (1)
    5. Inward rectifier potassium channel kirbac3.1 [118227]
      1. Magnetospirillum magnetotacticum [TaxId: 188] [118228] (2)
        SQ Q8YY97 # 46% sequence identity; Anabaena sp. PCC 7120 TaxID: 103690
Small-conductance potassium channel [81328] (1)
oligomeric transmembrane alpha-helical protein
1. Small-conductance potassium channel [81327] (1)
  uperfamily
  1. Small-conductance potassium channel [81326] (1)
    1. Small-conductance potassium channel [64528]
      1. Rat (Rattus norvegicus) [TaxId: 10116] [64529] (2)
Gated mechanosensitive channel [81331] (1)
oligomeric transmembrane alpha-helical protein
1. Gated mechanosensitive channel [81330] (1)
  uperfamily
  1. Gated mechanosensitive channel [81329] (1)
    1. Gated mechanosensitive channel [56904]
      Large-conductance ion channel
      1. Mycobacterium tuberculosis [TaxId: 1773] [56905] (5)
Neurotransmitter-gated ion-channel transmembrane pore [90111] (1)
heteropentameric transmembrane alpha-helical protein; 4 transmembrane helices per subunit
1. Neurotransmitter-gated ion-channel transmembrane pore [90112] (1)
  uperfamily
  1. Neurotransmitter-gated ion-channel transmembrane pore [90113] (4)
    1. Acetylcholine receptor protein, alpha chain [90114]
      1. Marbled electric ray (Torpedo marmorata) [TaxId: 7788] [90115] (1)
    2. Acetylcholine receptor protein, beta chain [90116]
      1. Marbled electric ray (Torpedo marmorata) [TaxId: 7788] [90117] (1)
    3. Acetylcholine receptor protein, delta chain [90118]
      1. Marbled electric ray (Torpedo marmorata) [TaxId: 7788] [90119] (1)
    4. Acetylcholine receptor protein, gamma chain [90120]
      1. Marbled electric ray (Torpedo marmorata) [TaxId: 7788] [90121] (1)
Mechanosensitive channel protein MscS (YggB), transmembrane region [82860] (1)
oligomeric fold; 3 transmembrane helices per subunit
1. Mechanosensitive channel protein MscS (YggB), transmembrane region [82861] (1)
  uperfamily
  1. Mechanosensitive channel protein MscS (YggB), transmembrane region [82862] (1)
    1. Mechanosensitive channel protein MscS (YggB), transmembrane region [82863]
      homoheptameric protein
      1. Escherichia coli [TaxId: 562] [82864] (14)
Multidrug resistance efflux transporter EmrE [103480] (1)
oligomeric fold; 3 transmembrane helices per subunit
1. Multidrug resistance efflux transporter EmrE [103481] (1)
  uperfamily
  1. Multidrug resistance efflux transporter EmrE [103482] (1)
    1. Multidrug resistance efflux transporter EmrE [103483]
      1. Escherichia coli [TaxId: 562] [103484] (1)
V-type ATP synthase subunit C [103485] (1)
9 transmembrane helices
1. V-type ATP synthase subunit C [103486] (1)
  duplication: consists of three similar structural parts
  uperfamily
  1. V-type ATP synthase subunit C [103487] (1)
    1. V-type ATP synthase subunit C [103488]
      1. Thermus thermophilus [TaxId: 274] [103489] (2)
Preprotein translocase SecY subunit [103490] (1)
10 transmembrane helices forming of a gated channel
1. Preprotein translocase SecY subunit [103491] (1)
  duplication: consists of two similar structural parts
  uperfamily
  1. Preprotein translocase SecY subunit [103492] (1)
    1. Preprotein translocase SecY subunit [103493]
      1. Archaeon Methanococcus jannaschii [TaxId: 2190] [103494] (2)
Photosystem I subunits PsaA/PsaB [81559] (1)
core:11 transmembrane helices
1. Photosystem I subunits PsaA/PsaB [81558] (1)
  uperfamily
  1. Photosystem I subunits PsaA/PsaB [81557] (2)
    Photosystem I p700 chlorophyll a apoprotein a1/a2
    1. Apoprotein a1, PsaA [81554]
      1. Synechococcus elongatus [TaxId: 32046] [81553] (1)
    2. Apoprotein a2, PsaB [81556]
      1. Synechococcus elongatus [TaxId: 32046] [81555] (1)
Photosystem I reaction center subunit X, PsaK [81564] (1)
core: hairpin of two transmembrane helices
1. Photosystem I reaction center subunit X, PsaK [81563] (1)
  uperfamily
  1. Photosystem I reaction center subunit X, PsaK [81562] (1)
    1. Photosystem I reaction center subunit X, PsaK [81561]
      1. Synechococcus elongatus [TaxId: 32046] [81560] (1)
Photosystem I reaction center subunit XI, PsaL [81569] (1)
core: three transmembrane helices, bundle
1. Photosystem I reaction center subunit XI, PsaL [81568] (1)
  uperfamily
  1. Photosystem I reaction center subunit XI, PsaL [81567] (1)
    1. Photosystem I reaction center subunit XI, PsaL [81566]
      1. Synechococcus elongatus [TaxId: 32046] [81565] (1)
ABC transporter involved in vitamin B12 uptake, BtuC [81346] (1)
multihelical; complex architecture with several transmembrane helices
1. ABC transporter involved in vitamin B12 uptake, BtuC [81345] (1)
  uperfamily
  1. ABC transporter involved in vitamin B12 uptake, BtuC [75648] (1)
    1. ABC transporter involved in vitamin B12 uptake, BtuC [75649]
      1. Escherichia coli [TaxId: 562] [75650] (1)
ABC transporter transmembrane region [90122] (1)
multihelical; complex architecture with several transmembrane helices
1. ABC transporter transmembrane region [90123] (1)
  uperfamily
  1. ABC transporter transmembrane region [90124] (3)
    1. Multidrug resistance ABC transporter MsbA, N-terminal domain [90125]
      a low-resolution structure of the E.coli MsbA in an open conformation is also available (f.35.1.1)
      1. Vibrio cholerae [TaxId: 666] [90126] (1)
      2. Salmonella typhimurium [TaxId: 90371] [161075] (12)
        SQ P63359 10-328
    2. Putative multidrug export ATP-binding/permease protein SAV1866 [144087]
      1. Staphylococcus aureus [TaxId: 1280] [144088] (4)
        SQ Q99T13 1-323
Multidrug efflux transporter AcrB transmembrane domain [82865] (1)
12 transmembrane helices; duplication: the N- and C-terminal halves of the whole proteins are structurally similar
1. Multidrug efflux transporter AcrB transmembrane domain [82866] (1)
  uperfamily
  1. Multidrug efflux transporter AcrB transmembrane domain [82867] (1)
    1. Multidrug efflux transporter AcrB transmembrane domain [82868]
      1. Escherichia coli [TaxId: 562] [82869] (6)
a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81649] (1)
core: three transmembrane helices, up-and-down bundle
1. a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81648] (1)
  uperfamily
  1. a domain/subunit of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81647] (5)
    a part (domain) of mitochondrial cytochrome b subunit, separate subunit in plants and cyanobacteria
    1. Mitochondrial cytochrome b subunit, C-terminal domain [81646]
      1. Cow (Bos taurus) [TaxId: 9913] [81643] (17)
        SQ P00157
      2. Chicken (Gallus gallus) [TaxId: 9031] [81644] (5)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81645] (9)
    2. Subunit IV of the cytochrome b6f complex [103495]
      1. Mastigocladus laminosus [TaxId: 83541] [103496] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103497] (1)
Heme-binding four-helical bundle [81344] (3)
core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices
1. Transmembrane di-heme cytochromes [81342] (2)
  Three of the four heme-ligands are conserved between the two families; both heme groups bind similarly but not identically
  uperfamily
  1. Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81642] (5)
    a part (domain) of a larger mitochondrial cytochrome b subunit, separate subunit in plants and cyanobacteria
    1. Mitochondrial cytochrome b subunit, N-terminal domain [81641]
      also includes extra transmembrane (linker) helix absent in plants and cyanobacteria subunits
      1. Cow (Bos taurus) [TaxId: 9913] [81638] (17)
        SQ P00157
      2. Chicken (Gallus gallus) [TaxId: 9031] [81639] (5)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81640] (9)
    2. Cytochrome b6 subunit of the cytochrome b6f complex [103498]
      1. Mastigocladus laminosus [TaxId: 83541] [103499] (6)
      2. Chlamydomonas reinhardtii [TaxId: 3055] [103500] (1)
  2. Formate dehydrogenase N, cytochrome (gamma) subunit [75645] (1)
    1. Formate dehydrogenase N, cytochrome (gamma) subunit [75646]
      1. Escherichia coli [TaxId: 562] [75647] (2)
2. Respiratory nitrate reductase 1 gamma chain [103501] (1)
  possible link between the two other superfamilies: this subunit corresponds to the gamma subunit of a functionally related Formate dehydrogenase N complex but is structurally closer to the Fumarate reductase subunit FrdC
  uperfamily
  1. Respiratory nitrate reductase 1 gamma chain [103502] (1)
    1. Respiratory nitrate reductase 1 gamma chain [103503]
      1. Escherichia coli [TaxId: 562] [103504] (6)
        SQ P11350
3. Fumarate reductase respiratory complex transmembrane subunits [81343] (2)
  two distinct families: in one family the common fold is contained in a single-chain subunit, in the other it is formed by two chains
  uperfamily
  1. Fumarate reductase respiratory complex cytochrome b subunit, FrdC [56910] (1)
    duplication: consists of two structural repeats; the heme-binding sites are related by pseudo two fold symmetry
    1. Fumarate reductase respiratory complex cytochrome b subunit, FrdC [56911]
      1. Wolinella succinogenes [TaxId: 844] [56913] (8)
  2. Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) [81373] (4)
    consists of two homologous non-identical subunits that form a heterodimer; may or may not contain heme groups
    1. Succinate dehydrogenase subunit SdhC [82870]
      Cytochrome b556 subunit
      1. Escherichia coli [TaxId: 562] [82871] (3)
    2. Succinate dehydrogenase subunit SdhD [82872]
      membrane anchor protein
      1. Escherichia coli [TaxId: 562] [82873] (3)
    3. Fumarate reductase subunit FrdC [81370]
      1. Escherichia coli [TaxId: 562] [81369] (7)
        is not known to bind heme
    4. Fumarate reductase subunit FrdD [81372]
      1. Escherichia coli [TaxId: 562] [81371] (7)
        is not known to bind heme
14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81525] (1)
membrane-associated alpha-helical protein; no transmembrane helices
1. 14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81524] (1)
  location - matrix side of the bc1 complex
  uperfamily
  1. 14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81523] (3)
    probably important for the complex assembly, caps the matrix face of cytochrome b
    1. 14 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81522]
      1. Cow (Bos taurus) [TaxId: 9913] [81519] (19)
        SQ P00129
      2. Chicken (Gallus gallus) [TaxId: 9031] [81520] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81521] (9)
Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81532] (1)
membrane-associated alpha-helical protein; no transmembrane helices
1. Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81531] (1)
  location - intermembrane side of the bc1 complex
  uperfamily
  1. Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81530] (3)
    "acidic/hinge protein", essential for the complex formation, interacts with the functional domain of cytochrome c1
    1. Non-heme 11 kDa protein of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) [81529]
      1. Cow (Bos taurus) [TaxId: 9913] [81526] (19)
        SQ P00126
      2. Chicken (Gallus gallus) [TaxId: 9031] [81527] (3)
      3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81528] (9)
Mitochondrial ATP synthase coupling factor 6 [111356] (1)
2 helices, hairpin
1. Mitochondrial ATP synthase coupling factor 6 [111357] (1)
  uperfamily
  1. Mitochondrial ATP synthase coupling factor 6 [111358] (1)
    Pfam 05511
    1. ATPase subunit F6 [111359]
      1. Cow (Bos taurus) [TaxId: 9913] [111360] (3)
        SQ P02721 33-108
Calcium ATPase, transmembrane domain M [81666] (1)
core: multihelical; consists of three transmembrane regions of 2, 2 and 6 helices, separated by cytoplasmic domains
1. Calcium ATPase, transmembrane domain M [81665] (1)
  uperfamily
  1. Calcium ATPase, transmembrane domain M [81664] (1)
    1. Calcium ATPase, transmembrane domain M [81663]
      the N-terminal 40 residues interact with /form a part of transduction domain A
      1. Rabbit (Oryctolagus cuniculus) [TaxId: 9986] [81662] (17)
        SQ P04191
Light-harvesting complex subunits [56917] (1)
membrane all-alpha fold
1. Light-harvesting complex subunits [56918] (1)
  uperfamily
  1. Light-harvesting complex subunits [56919] (5)
    1. Light-harvesting complex subunits [56920]
      1. Purple bacterium (Rhodoblastus acidophilus) [TaxId: 1074] [56921] (20)
      2. Rhodospirillum molischianum [TaxId: 1083] [56922] (1)
      3. Rhodobacter sphaeroides [TaxId: 1063] [56923] (2)
      4. Rhodoblastus acidophilus [TaxId: 1074] [69916] (1)
      5. Rhodospirillum rubrum [TaxId: 1085] [144089] (1)
        SQ P02947 1-52
Photosystem II antenna protein-like [161076] (1)
6 transmembrane helices arranged in three antiparallel pairs (hairpins), segregated by cofactors; there can be insertions of different small subdomains in different exposed loops
1. Photosystem II antenna protein-like [161077] (1)
  1. Photosystem II antenna protein-like [161078] (2)
    Pfam 00421
    1. Photosystem II core light harvesting protein PsbB [161079]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161080] (1)
        SQ Q8DIQ1 2-489
    2. Photosystem II CP43 protein PsbC [161081]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161082] (1)
        SQ Q8DIF8 15-461
Mitochondrial carrier [103505] (1)
membrane all-alpha fold; 6-helical "barrel" with internal binding cavity
1. Mitochondrial carrier [103506] (1)
  duplication: consists of three alpha-hairpin repeats
  uperfamily
  1. Mitochondrial carrier [103507] (1)
    1. ADP,ATP carrier protein [103508]
      1. Cow (Bos taurus), heart isoform t1 [TaxId: 9913] [103509] (1)
Chlorophyll a-b binding protein [103510] (1)
membrane all-alpha fold; three transmembrane helices
1. Chlorophyll a-b binding protein [103511] (1)
  duplication: contains two structural repeats
  uperfamily
  1. Chlorophyll a-b binding protein [103512] (1)
    1. Chlorophyll a-b binding protein [103513]
      part of chloroplast major light-harvesting complex; see also low-resolution structure of pea protein, PDB entry 1VCR
      1. Spinach (Spinacia oleracea) [TaxId: 3562] [103514] (1)
MAPEG domain-like [161083] (1)
4 helices, bundle; left-handed superhelix
1. MAPEG domain-like [161084] (1)
  1. MAPEG domain [161085] (3)
    Pfam 01124
    1. Arachidonate 5-lipoxygenase-activating protein, FLAP [161086]
      1. Human (Homo sapiens) [TaxId: 9606] [161087] (12)
        SQ P20292 1-139
    2. Microsomal glutathione S-transferase 1 [161088]
      1. Rat (Rattus norvegicus) [TaxId: 10116] [161089] (1)
        SQ P08011 10-148
    3. Leukotriene C4 synthase [161090]
      1. Human (Homo sapiens) [TaxId: 9606] [161091] (14)
        SQ Q16873 2-147
MgtE membrane domain-like [161092] (1)
5 transmembrane helices; bundle, right-handed twist
1. MgtE membrane domain-like [161093] (1)
  homodimer, swapped with the N-terminal helices
  1. MgtE membrane domain-like [161094] (1)
    Pfam 01769; Divalent cation transporter
    1. Mg2+ transporter MgtE [161095]
      1. Thermus thermophilus [TaxId: 274] [161096] (4)
        SQ Q5SMG8 276-448
MetI-like [161097] (1)
core: 5 transmembrane helices; flattened bundle
1. MetI-like [161098] (1)
  1. MetI-like [161099] (5)
    Pfam 00528; Binding-protein-dependent transport system inner membrane component
    1. Sulfate/molybdate ABC transporter, permease protein [161100]
      1. Methanosarcina acetivorans [TaxId: 2214] [161101] (2)
        SQ Q8TTZ4 13-260
    2. Molybdate/tungstate transport system permease protein WtpB (ModB) [161102]
      1. Archaeoglobus fulgidus [TaxId: 2234] [161103] (4)
        SQ O30143 1-252
    3. Maltose transport system permease protein MalG [161104]
      1. Escherichia coli [TaxId: 562] [161105] (1)
        SQ P68183 7-296
    4. Maltose transport system permease protein MalF [161106]
      1. Escherichia coli [TaxId: 562] [161107] (1)
        SQ P02916 261-504
    5. D-methionine transport system permease protein MetI [161108]
      Synonym: YaeE
      1. Escherichia coli [TaxId: 562] [161109] (4)
        SQ P31547 6-208
Rhomboid-like [144090] (1)
6 transmembrane helices
1. Rhomboid-like [144091] (1)
  uperfamily
  1. Rhomboid-like [144092] (2)
    Pfam 01694; transmembrane serine protease
    1. GlpG homolog HI0618 [144093]
      1. Haemophilus influenzae [TaxId: 727] [144094] (1)
        SQ P44783 4-192
    2. GlpG [144095]
      1. Escherichia coli [TaxId: 562] [144096] (7)
        SQ P09391 91-272
Cation efflux protein transmembrane domain-like [161110] (1)
6 transmembrane helices, bundle
1. Cation efflux protein transmembrane domain-like [161111] (1)
  1. Cation efflux protein transmembrane domain-like [161112] (1)
    N-terminal part of Pfam 01545
    1. Ferrous-iron efflux pump FieF [161113]
      1. Escherichia coli [TaxId: 562] [161114] (2)
        SQ P69380 5-208
Connexin43 [118219] (1)
mostly unstructured; 2 helices, hairpin
1. Connexin43 [118220] (1)
  uperfamily
  1. Connexin43 [118221] (1)
    Pfam 03508
    1. Gap junction alpha-1 protein, C-terminal domain [118222]
      1. Rat (Rattus norvegicus) [TaxId: 10116] [118223] (1)
        SQ P08050 251-381
Transmembrane beta-barrels [56924] (6)
not a true fold, gathers together transmembrane barrels of different (n,S)
1. OMPA-like [56925] (4)
  forms (8,10) barrel
  uperfamily
  1. Outer membrane protein [56926] (3)
    1. Outer membrane protein A (OMPA) transmembrane domain [56927]
      1. Escherichia coli [TaxId: 562] [56928] (4)
    2. Outer membrane protein X (OMPX) [56929]
      1. Escherichia coli [TaxId: 562] [56930] (5)
        SQ P36546
    3. Outer membrane protein NspA [90127]
      1. Neisseria meningitidis [TaxId: 487] [90128] (1)
  2. Outer membrane enzyme PagP [82874] (1)
    1. Outer membrane enzyme PagP [82875]
      1. Escherichia coli [TaxId: 562] [82876] (3)
        SQ Q7C2L2
  3. GNA1870 immunodominant domain-like [144097] (1)
    related to Pfam 01298; GNA1870 is a bacterial cell surface-exposed lipoprotein
    1. Lipoprotein GNA1870 immunodominant domain [144098]
      1. Neisseria meningitidis [TaxId: 487] [144099] (1)
        SQ Q6QCC2 120-274
  4. PsbO-like [161115] (1)
    Pfam 01716; MSP
    1. Manganese-stabilising protein, PsbO [161116]
      1. Thermosynechococcus elongatus [TaxId: 146786] [161117] (1)
        SQ P0A431 30-271
2. OMPT-like [69917] (2)
  forms (10,12) barrel
  uperfamily
  1. Outer membrane protease OMPT [69918] (1)
    1. Outer membrane protease OMPT [69919]
      1. Escherichia coli [TaxId: 562] [69920] (1)
  2. Outer membrane adhesin/invasin OpcA [75651] (1)
    1. Outer membrane adhesin/invasin OpcA [75652]
      1. Neisseria meningitidis [TaxId: 487] [75653] (2)
3. Autotransporter [103515] (1)
  forms (12,14) barrel; contains a long alpha-helix running along the barrel axis
  uperfamily
  1. Autotransporter [103516] (1)
    1. Translocator domain of NalP [103517]
      1. Neisseria meningitidis [TaxId: 487] [103518] (2)
4. Outer membrane phospholipase A (OMPLA) [56931] (1)
  forms (12,16) barrel
  uperfamily
  1. Outer membrane phospholipase A (OMPLA) [56932] (1)
    1. Outer membrane phospholipase A (OMPLA) [56933]
      1. Escherichia coli [TaxId: 562] [56934] (7)
5. Porins [56935] (4)
  uperfamily
  1. Porin [56936] (5)
    trimer, one subunit folds into (16,20) barrel
    1. Porin [56937]
      1. Escherichia coli, different sequences [TaxId: 562] [56938] (21)
      2. Rhodobacter capsulatus [TaxId: 1061] [56939] (2)
      3. Rhodopseudomonas blastica, strain DSM2131 [TaxId: 1075] [56940] (9)
      4. Klebsiella pneumoniae [TaxId: 573] [56941] (1)
      5. Comamonas acidovorans [TaxId: 80866] [64534] (3)
        Anion-selective porin OMP32
  2. Maltoporin-like [56942] (3)
    trimer, one subunit folds into (18,22) barrel
    1. Maltoporin (also LamB protein) [56943]
      1. Escherichia coli [TaxId: 562] [56944] (8)
      2. Salmonella typhimurium [TaxId: 90371] [56945] (2)
    2. Sucrose-specific porin [56946]
      1. Enterobacterium (Salmonella typhimurium) [TaxId: 90371] [56947] (3)
  3. Ligand-gated protein channel [56948] (4)
    monomeric (22,24) barrel; ~150 N-terminal residues form a "plug" or "cork" subdomain
    1. Ferric hydroxamate uptake receptor FhuA [56949]
      1. Escherichia coli [TaxId: 562] [56950] (11)
    2. Ferric enterobactin receptor FepA [56951]
      1. Escherichia coli [TaxId: 562] [56952] (1)
    3. Outer membrane transporter FecA [75654]
      1. Escherichia coli [TaxId: 562] [75655] (5)
    4. Outer membrane cobalamin transporter BtuB [90129]
      vitamin B12 receptor
      1. Escherichia coli [TaxId: 562] [90130] (8)
  4. Outer membrane protein transport protein [111361] (1)
    Pfam 03349; monomeric (14,16) barrel; plugged by an N-terminal all-alpha subdomain (1-40)
    1. Long-chain fatty acid transport protein FadL [111362]
      1. Escherichia coli [TaxId: 562] [111363] (2)
        SQ P10384
6. Tsx-like channel [111364] (1)
  forms (12,16) barrel
  uperfamily
  1. Tsx-like channel [111365] (1)
    Pfam 03502
    1. Nucleoside-specific channel-forming protein tsx (NupA) [111366]
      1. Escherichia coli [TaxId: 562] [111367] (3)
        SQ P22786
Outer membrane efflux proteins (OEP) [56953] (1)
subunit fold contains tandem repeat of alpha-beta hairpin-alpha(2) motif
trimeric fold contains barrel (n=12, S=18) formed by beta-hairpins, two from each subunit, and a bundle of helices with a channel running through it
1. Outer membrane efflux proteins (OEP) [56954] (1)
  uperfamily
  1. Outer membrane efflux proteins (OEP) [56955] (2)
    Pfam 02321
    1. Integral outer membrane protein TolC, efflux pump component [56956]
      1. Escherichia coli [TaxId: 562] [56957] (2)
        SQ P02930
    2. Outer membrane protein OprM [118229]
      1. Pseudomonas aeruginosa [TaxId: 287] [118230] (1)
        SQ Q51487 18-485
HlyD-like secretion proteins [111368] (1)
consists of three domains: beta-barrel (res. 29-38,170-259; scop_cf 50412); barrel-sandwich hybrid (39-72,135-169; scop_sf 51230) and long alpha-hairpin (73-134; scop_cf 46556)
1. HlyD-like secretion proteins [111369] (1)
  uperfamily
  1. HlyD-like secretion proteins [111370] (1)
    Pfam 00529
    1. Multidrug resistance protein MexA domain [111371]
      periplasmic component of efflux pump; channel-forming oligomer, interacts with TolC
      1. Pseudomonas aeruginosa [TaxId: 287] [111372] (2)
        SQ P52477
Leukocidin-like [56958] (1)
subunit fold contains beta-sandwich of Ig-like (grerk-key) topology and a beta-ribbon arm that forms an oligomeric transmembrane barrel
1. Leukocidin-like [56959] (2)
  uperfamily
  1. Leukocidin (pore-forming toxin) [56960] (4)
    heptameric fold contains barrel (n=14, S=14) formed by beta-ribbon arms, one from each subunit
    1. Alpha-hemolysin [56961]
      1. Staphylococcus aureus [TaxId: 1280] [56962] (1)
    2. Leucocidin K component LukF-PV [56963]
      1. Staphylococcus aureus [TaxId: 1280] [56964] (1)
    3. Leukocidin F (HlgB) [56965]
      1. Staphylococcus aureus [TaxId: 1280] [56966] (3)
    4. Leucocidin S component LukS-PV [111373]
      1. Staphylococcus aureus bacteriophage PVL [TaxId: 71366] [111374] (1)
        SQ O80066
  2. Porin MspA [103519] (1)
    octameric fold contains barrel (n=16, S=16) formed by beta-ribbon arms, one from each subunit
    1. Porin MspA [103520]
      1. Mycobacterium smegmatis [TaxId: 1772] [103521] (1)
Lipovitellin-phosvitin complex; beta-sheet shell regions [56967] (1)
contains several large open beta-sheets
1. Lipovitellin-phosvitin complex; beta-sheet shell regions [56968] (1)
  uperfamily
  1. Lipovitellin-phosvitin complex; beta-sheet shell regions [56969] (1)
    1. Lipovitellin-phosvitin complex; beta-sheet shell regions [56970]
      1. Lamprey (Ichthyomyzon unicuspis) [TaxId: 30308] [56971] (2)
Aerolisin/ETX pore-forming domain [56972] (1)
3 domains: (1) alpha+beta; (2&3) all-beta
1. Aerolisin/ETX pore-forming domain [56973] (2)
  uperfamily
  1. (Pro)aerolysin, pore-forming lobe [56974] (1)
    1. (Pro)aerolysin, pore-forming lobe [56975]
      contains the APT module at the N-terminus
      1. Aeromonas hydrophila [TaxId: 644] [56976] (9)
  2. ETX/MTX2 [111375] (1)
    Pfam 03318
    1. Epsilon-toxin, ETX [111376]
      1. Clostridium perfringens [TaxId: 1502] [111377] (1)
        SQ Q57398
Perfringolysin [56977] (1)
2 domains: (1) alpha+beta; (2) all-beta, similar to the CalB domain fold but the two last strands are transposed
1. Perfringolysin [56978] (1)
  uperfamily
  1. Perfringolysin [56979] (1)
    1. Perfringolysin [56980]
      1. Clostridium perfringens [TaxId: 1502] [56981] (3)
Viral glycoprotein, central and dimerisation domains [56982] (1)
2 intertwined domains; all-beta and alpha+beta
1. Viral glycoprotein, central and dimerisation domains [56983] (1)
  uperfamily
  1. Viral glycoprotein, central and dimerisation domains [56984] (3)
    1. Envelope glycoprotein [56985]
      1. Tick-borne encephalitis virus [TaxId: 11084] [56986] (2)
      2. Dengue virus type 2 [TaxId: 11060] [90131] (9)
        SQ P12823 281-675
    2. Fusion glycoprotein E1 [75656]
      1. Semliki forest virus [TaxId: 11033] [75657] (3)
VP4 membrane interaction domain [111378] (1)
2 domains; d1: complexed all-beta fold; d2: coiled-coil (trimeric) helical region
1. VP4 membrane interaction domain [111379] (1)
  uperfamily
  1. VP4 membrane interaction domain [111380] (1)
    1. VP4 membrane interaction domain [111381]
      1. Rhesus rotavirus [TaxId: 10969] [111382] (1)
        SQ Q91HI9 253-522
Head and neck region of the ectodomain of NDV fusion glycoprotein [69921] (1)
3 intertwined all-beta domains
1. Head and neck region of the ectodomain of NDV fusion glycoprotein [69922] (1)
  uperfamily
  1. Head and neck region of the ectodomain of NDV fusion glycoprotein [69923] (1)
    1. Head and neck region of the ectodomain of NDV fusion glycoprotein [69924]
      1. Newcastle disease virus [TaxId: 11176] [69925] (1)
OmpH-like [111383] (1)
trimer; one subunit consists of an alpha/beta oligomerization subdomain [3-stranded parallel beta-sheet, order 213], and an antiparallel coiled coil
1. OmpH-like [111384] (1)
  uperfamily
  1. OmpH-like [111385] (1)
    Pfam 03938
    1. Periplasmic chaperon skp (HlpA) [111386]
      1. Escherichia coli [TaxId: 562] [111387] (2)
        SQ P11457
Anthrax protective antigen [56987] (1)
4 domains; I (res. 14-225) and II (226-487) are beta-sandwiches of similar gamma-crystallin like topologies; III (488-594) has a beta-grasp like fold; IV (595-735) has an Ig-like fold
1. Anthrax protective antigen [56988] (1)
  uperfamily
  1. Anthrax protective antigen [56989] (1)
    1. Anthrax protective antigen [56990]
      1. Anthrax bacillus (Bacillus anthracis) [TaxId: 1392] [56991] (3)
        SQ P13423