Structural Classification of Proteins
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Fold: Heme-binding four-helical bundle

core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices

Lineage:

  1. Root: scop
  2. Class: Membrane and cell surface proteins and peptides [56835]
    Does not include proteins in the immune system
  3. Fold: Heme-binding four-helical bundle [81344]
    core: four transmembrane helices, up-and-down bundle, binds one or two heme groups in between the helices

Superfamilies:

  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
    link to SUPERFAMILY database - Superfamily
    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
          1. 1ppj picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with any, azi, bhg, cdl, fes, gol, hec, hem, pee, po4, sma
            1. region c:15-260 [104257] picpiclink
            2. region p:15-260 [104272] picpiclink
          2. 1pp9 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with azi, bhg, cdl, fes, gol, hec, hem, pee, po4, sma, uq
            1. region c:15-260 [104227] picpiclink
            2. region p:15-260 [104242] picpiclink
          3. 2fyu picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1be3c3
            complexed with fdn, fes, hem
            1. region c:2-260 [134397] picpiclink
          4. 1ntm picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem
            1. region c:2-260 [92126] picpiclink
          5. 1ntz picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem, uq2
            1. region c:2-260 [92154] picpiclink
          6. 1l0l picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, fmx, hem
            1. region c:3-260 [84487] picpiclink
          7. 1sqx picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1be3c3
            complexed with fes, hem, sma, uq2
            1. region c:2-260 [119040] picpiclink
          8. 1ntk picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with ay1, fes, hem
            1. region c:2-260 [92110] picpiclink
          9. 1l0n picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem
            1. region c:3-260 [84503] picpiclink
          10. 1sqb picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with azo, fes, hem
            1. region c:2-260 [105895] picpiclink
          11. 1sqv picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1be3c3
            complexed with fes, hem, uhd, uq2
            1. region c:2-260 [119025] picpiclink
          12. 1sqp picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1be3c3
            complexed with cdl, fes, hem, myx, pee, plx
            1. region c:2-260 [119000] picpiclink
          13. 1sqq picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1be3c3
            complexed with fes, hem, ost, uq2
            1. region c:2-260 [119012] picpiclink
          14. 1nu1 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem, qno
            1. region c:2-260 [92172] picpiclink
          15. 1be3 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hec, hem
            1. region c:1-260 [75806] picpiclink
          16. 1bgy picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hec, hem
            1. region c:1-260 [75808] picpiclink
            2. region o:1-260 [75810] picpiclink
          17. 1qcr picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with hem
            1. region c:2-260 [75932] picpiclink
        2. Chicken (Gallus gallus) [TaxId: 9031] [81639] (5)
          1. 1bcc picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with bog, fes, hem, pee, u10
            1. region c:2-261 [75804] picpiclink
          2. 2bcc picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with bog, fes, hem, pee, sig, u10
            1. region c:2-261 [75988] picpiclink
          3. 3cwb picpicxrefxref
            automatically matched to d1bccc3
            complexed with azi, bog, cdl, fes, hec, hem, icx, pee, unl, uq
            1. region c:2-261 [157046] picpiclink
          4. 3cwb picpicxrefxref
            automatically matched to d1bccc3
            complexed with azi, bog, cdl, fes, hec, hem, icx, pee, unl, uq
            1. region p:2-261 [157048] picpiclink
          5. 3bcc picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with amy, fes, hem, sig
            1. region c:2-261 [75999] picpiclink
        3. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [81640] (9)
          1. 3cx5 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1ezvc3
            complexed with 6ph, 7ph, 8pe, 9pe, cn3, cn5, fes, hem, m3l, sma, suc, umq
            1. region c:1-261 [157081] picpiclink
          2. 3cx5 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1ezvc3
            complexed with 6ph, 7ph, 8pe, 9pe, cn3, cn5, fes, hem, m3l, sma, suc, umq
            1. region n:1-261 [157097] picpiclink
          3. 1kb9 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with cdl, fes, hem, pcf, pef, pie, sma, umq, uq6
            1. region c:1-261 [77316] picpiclink
          4. 2ibz picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1ezvc3
            complexed with fes, hem, sma, uq6
            1. region c:1-261 [137220] picpiclink
          5. 1ezv picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem, sma, uq6
            1. region c:1-261 [75834] picpiclink
          6. 3cxh picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1ezvc3
            complexed with 6ph, 7ph, 8pe, 9pe, cn6, fes, hem, m3l, sma, suc, umq
            1. region c:1-261 [157114] picpiclink
          7. 3cxh picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1ezvc3
            complexed with 6ph, 7ph, 8pe, 9pe, cn6, fes, hem, m3l, sma, suc, umq
            1. region n:1-261 [157130] picpiclink
          8. 1p84 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with 3pe, 3ph, cdl, dbt, fes, hem, pc1, umq, uq6
            1. region c:1-261 [87855] picpiclink
          9. 1kyo picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with fes, hem, m3l, sma
            1. region c:1-261 [75905] picpiclink
            2. region n:1-261 [75907] picpiclink
      2. Cytochrome b6 subunit of the cytochrome b6f complex [103498]
        1. Mastigocladus laminosus [TaxId: 83541] [103499] (6)
          1. 2e74 picpicxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1vf5a_
            complexed with bcr, cd, cla, fes, hem, opc, sqd, umq
            1. region a:13-214 [132048] picpiclink
          2. 1vf5 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with bcr, cla, fes, hem, opc, pl9, tds
            1. chain a [100578] picpiclink
            2. chain n [100589] picpiclink
          3. 2e76 picpicxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1vf5a_
            complexed with bcr, cd, cla, fes, hem, opc, sqd, tds, umq
            1. region a:13-214 [132058] picpiclink
          4. 2e75 picpicxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1vf5a_
            complexed with bcr, cd, cla, fes, hem, opc, qno, sqd, umq
            1. region a:13-214 [132053] picpiclink
          5. 2d2c picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1vf5a_
            complexed with bcr, bnt, cla, fes, hec, hem, opc
            1. region a:13-214 [131161] picpiclink
          6. 2d2c picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1vf5a_
            complexed with bcr, bnt, cla, fes, hec, hem, opc
            1. region n:13-214 [131167] picpiclink
        2. Chlamydomonas reinhardtii [TaxId: 3055] [103500] (1)
          1. 1q90 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with bcr, cl1, fes, hem, lfa, lmg, sqd, tds; mutant
            1. chain b [96241] picpiclink
    2. Formate dehydrogenase N, cytochrome (gamma) subunit [75645] (1)
      1. Formate dehydrogenase N, cytochrome (gamma) subunit [75646]
        1. Escherichia coli [TaxId: 562] [75647] (2)
          1. 1kqf picpicxrefxrefxrefxref
            complexed with 6mo, cdl, cse, fs4, hem, mgd
            1. chain c [72874] picpiclink
          2. 1kqg picpicxrefxrefxrefxref
            complexed with 6mo, cdl, cse, fs4, hem, hq, mgd
            1. chain c [72878] picpiclink
  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
    link to SUPERFAMILY database - Superfamily
    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
          1. 1y5i picpicxrefxrefxref
            complexed with 3ph, 6mo, aga, f3s, hem, md1, sf4; mutant
            1. region c:1-225 [144597] picpiclink
          2. 1q16 picpicxrefxrefxref
            complexed with 3ph, 6mo, aga, f3s, hem, md1, sf4
            1. chain c [95549] picpiclink
          3. 1y4z picpicxrefxrefxref
            automatically matched to d1q16c_
            complexed with 6mo, aga, f3s, hem, md1, pci, sf4; mutant
            1. region c:1-225 [122631] picpiclink
          4. 1siw picpicxrefxrefxref
            complexed with 3ph, f3s, gdp, hem, sf4
            1. chain c [105592] picpiclink
          5. 1y5l picpicxrefxrefxref
            complexed with 3ph, 6mo, f3s, hem, md1, sf4; mutant
            1. region c:1-225 [144598] picpiclink
          6. 1y5n picpicxrefxrefxref
            automatically matched to 1Y5I C:1-225
            complexed with 3ph, 6mo, aga, f3s, hem, md1, pci, sf4; mutant
            1. region c:1-225 [144599] picpiclink
  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
    link to SUPERFAMILY database - Superfamily
    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)
          1. 2bs2 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1qlac_
            complexed with f3s, fad, fes, fmr, hem, lmt, na, sf4
            1. region c:1-254 [129035] picpiclink
          2. 2bs2 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1qlac_
            complexed with f3s, fad, fes, fmr, hem, lmt, na, sf4
            1. region f:1-254 [129041] picpiclink
          3. 2bs3 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with cit, f3s, fad, fes, hem, lmt, na, sf4
            1. region c:1-255 [145005] picpiclink
          4. 2bs3 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to 2BS3 C:1-255
            complexed with cit, f3s, fad, fes, hem, lmt, na, sf4
            1. region f:1-255 [145006] picpiclink
          5. 1qlb picpicxrefxrefxrefxrefxref
            1. chain c [43724] picpiclink
            2. chain f [43725] picpiclink
          6. 2bs4 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            complexed with cit, dmw, f3s, fad, fes, hem, lmt, na, sf4
            1. region c:1-255 [145007] picpiclink
          7. 2bs4 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to 2BS4 C:1-255
            complexed with cit, dmw, f3s, fad, fes, hem, lmt, na, sf4
            1. region f:1-255 [145008] picpiclink
          8. 1e7p picpicxrefxrefxrefxrefxref
            complexed with f3s, fad, fes, fs4, hem, lmt, mla, na; mutant
            1. chain c [59352] picpiclink
            2. chain f [59358] picpiclink
            3. chain i [59364] picpiclink
            4. chain l [59370] picpiclink
    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)
          1. 1nek picpicxrefxrefxrefxrefxrefxref
            complexed with ca, cdn, eph, f3s, fad, fes, fs4, hem, oaa, uq2
            1. chain c [80431] picpiclink
          2. 1nen picpicxrefxrefxrefxrefxrefxref
            complexed with ca, cdn, dnt, eph, f3s, fad, fes, fs4, hem, oaa
            1. chain c [80438] picpiclink
          3. 2acz picpicxrefxrefxref
            automatically matched to d1nekc_
            complexed with at5, cdn, f3s, fad, fes, heb, oaa, sf4
            1. region c:1-129 [126566] picpiclink
      2. Succinate dehydrogenase subunit SdhD [82872]
        membrane anchor protein
        1. Escherichia coli [TaxId: 562] [82873] (3)
          1. 1nek picpicxrefxrefxrefxrefxrefxref
            complexed with ca, cdn, eph, f3s, fad, fes, fs4, hem, oaa, uq2
            1. chain d [80432] picpiclink
          2. 1nen picpicxrefxrefxrefxrefxrefxref
            complexed with ca, cdn, dnt, eph, f3s, fad, fes, fs4, hem, oaa
            1. chain d [80439] picpiclink
          3. 2acz picpicxrefxrefxref
            automatically matched to d1nekd_
            complexed with at5, cdn, f3s, fad, fes, heb, oaa, sf4
            1. region d:3-115 [126567] picpiclink
      3. Fumarate reductase subunit FrdC [81370]
        1. Escherichia coli [TaxId: 562] [81369] (7)
          is not known to bind heme
          1. 1kf6 picpicxrefxrefxrefxrefxrefxref
            complexed with 1pe, act, ce1, f3s, fad, fes, fs4, hqo, k, oaa
            1. chain c [72399] picpiclink
            2. chain o [72406] picpiclink
          2. 1l0v picpicxrefxrefxrefxrefxrefxref
            complexed with ce1, f3s, fad, fes, fs4, mq7, oaa
            1. chain c [73417] picpiclink
            2. chain o [73424] picpiclink
          3. 1kfy picpicxrefxrefxrefxrefxrefxref
            complexed with brs, ce1, f3s, fad, fes, fs4, oaa
            1. chain c [72432] picpiclink
            2. chain o [72439] picpiclink
          4. 3cir picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6c_
            complexed with f3s, fad, fes, sf4; mutant
            1. region c:1-130 [156684] picpiclink
          5. 3cir picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6c_
            complexed with f3s, fad, fes, sf4; mutant
            1. region o:1-130 [156691] picpiclink
          6. 2b76 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6c_
            complexed with f3s, fad, fes, flc, mq7, sf4; mutant
            1. region c:1-130 [128014] picpiclink
          7. 2b76 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6c_
            complexed with f3s, fad, fes, flc, mq7, sf4; mutant
            1. region o:1-130 [128021] picpiclink
      4. Fumarate reductase subunit FrdD [81372]
        1. Escherichia coli [TaxId: 562] [81371] (7)
          is not known to bind heme
          1. 1kf6 picpicxrefxrefxrefxrefxrefxref
            complexed with 1pe, act, ce1, f3s, fad, fes, fs4, hqo, k, oaa
            1. chain d [72400] picpiclink
            2. chain p [72407] picpiclink
          2. 1l0v picpicxrefxrefxrefxrefxrefxref
            complexed with ce1, f3s, fad, fes, fs4, mq7, oaa
            1. chain d [73418] picpiclink
            2. chain p [73425] picpiclink
          3. 1kfy picpicxrefxrefxrefxrefxrefxref
            complexed with brs, ce1, f3s, fad, fes, fs4, oaa
            1. chain d [72433] picpiclink
            2. chain p [72440] picpiclink
          4. 3cir picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6d_
            complexed with f3s, fad, fes, sf4; mutant
            1. region d:0-118 [156685] picpiclink
          5. 3cir picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6d_
            complexed with f3s, fad, fes, sf4; mutant
            1. region p:0-118 [156692] picpiclink
          6. 2b76 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6d_
            complexed with f3s, fad, fes, flc, mq7, sf4; mutant
            1. region d:0-118 [128015] picpiclink
          7. 2b76 picpicxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxrefxref
            automatically matched to d1kf6d_
            complexed with f3s, fad, fes, flc, mq7, sf4; mutant
            1. region p:0-118 [128022] picpiclink
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MRC site Generated from scop database 1.75 with scopm 1.101 on Wed Jun 3 10:42:06 2009
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