Structural Classification of Proteins

Fold: alpha/alpha toroid

: multihelical; up to seven alpha-hairpins are arranged in closed circular array; there may be sequence similarities between different superfamilies

Lineage:

Root: scop
Class: All alpha proteins [46456]
Fold: alpha/alpha toroid [48207]
multihelical; up to seven alpha-hairpins are arranged in closed circular array; there may be sequence similarities between different superfamilies

Superfamilies:

Six-hairpin glycosidases [48208] (9)
uperfamily
1. Glucoamylase [48209] (2)
  1. Glucoamylase [48210]
    1. Aspergillus awamori, variant x100 [TaxId: 105351] [48211] (6)
    2. Yeast (Saccharomycopsis fibuligera) [TaxId: 4944] [48212] (3)
2. Cellulases catalytic domain [48213] (13)
  1. CelA cellulase [48214]
    1. Clostridium thermocellum [TaxId: 1515] [48215] (3)
  2. Nonprocessive cellulase Cel9M [81846]
    contains only the catalytic module, which interacts with the substrate
    1. Clostridium cellulolyticum [TaxId: 1521] [81847] (2)
  3. Endo-1,4-beta-xylanase [89105]
    cold-adapted family 8 xylanase
    1. Pseudoalteromonas haloplanktis [TaxId: 228] [89106] (8)
  4. Endo/exocellulase:cellobiose E-4, N-terminal domain [48216]
    1. Thermomonospora fusca [TaxId: 2021] [48217] (4)
    2. Clostridium cellulolyticum, atcc 35319 [TaxId: 1521] [89107] (4)
      endoglucanase 9G
  5. Endo-b-1,4-glucanase [81848]
    1. Termite (Nasutitermes takasagoensis) [TaxId: 62960] [81849] (3)
  6. CelD cellulase, C-terminal domain [48218]
    the other, N-terminal, domain is immunoglobulin-like
    1. Clostridium thermocellum [TaxId: 1515] [48219] (1)
  7. Cellulose 1,4-beta-cellobiosidase CbhA [101363]
    1. Clostridium thermocellum [TaxId: 1515] [101364] (2)
  8. Processive endocellulase CelF (Cel48F) [48220]
    1. Clostridium cellulolyticum [TaxId: 1521] [48221] (9)
    2. Clostridium thermocellum [TaxId: 1515] [74765] (2)
  9. Chitosanase [116987]
    1. Bacillus sp., strain k17 [TaxId: 1409] [116988] (2)
      SQ Q9ALZ1 49-434
  10. Xylanase Y [140784]
    1. Bacillus halodurans [TaxId: 86665] [140785] (3)
      SQ Q9KB30 6-381
  11. Probable endoglucanase CmcAX [140786]
    1. Acetobacter xylinus [TaxId: 28448] [140787] (1)
      SQ P37696 23-341
3. N-acylglucosamine (NAG) epimerase [48222] (2)
  1. N-acyl-D-glucosamine 2-epimerase [48223]
    1. Pig (Sus scrofa) [TaxId: 9823] [48224] (1)
  2. Putative NAG isomerase YihS [140788]
    1. Salmonella typhimurium [TaxId: 90371] [140789] (6)
      SQ Q8ZKT7 2-413
4. Glycosyltransferase family 36 C-terminal domain [63588] (2)
  overall domain organization is similar to Bacterial glucoamylase
  1. Lactobacillus maltose phosphorylase, central domain [63589]
    includes alpha-helical linker to the N-terminal domain and a small C-terminal beta-sandwich subdomain
    1. Lactobacillus brevis [TaxId: 1580] [63590] (1)
  2. Chitobiose phosphorylase ChbP [109951]
    1. Vibrio proteolyticus [TaxId: 671] [109952] (3)
      SQ Q76IQ9
5. Bacterial glucoamylase C-terminal domain-like [81850] (2)
  overall domain organization is similar to Lactobacillus maltose phosphorylase
  1. Bacterial glucoamylase, C-terminal domain [81851]
    1. Thermoanaerobacterium thermosaccharolyticum [TaxId: 1517] [81852] (2)
  2. Glucodextranase, domain A [101365]
    1. Arthrobacter globiformis [TaxId: 1665] [101366] (2)
6. Hypothetical protein YteR [89108] (1)
  unknown function; weak sequence similarity to the catalytic domain of cellulases
  1. Hypothetical protein YteR [89109]
    1. Bacillus subtilis [TaxId: 1423] [89110] (2)
7. Glycosyl Hydrolase Family 88 [109953] (1)
  Pfam 07470
  1. Unsaturated glucuronyl hydrolase [109954]
    1. Bacillus sp. GL1 [TaxId: 84635] [109955] (4)
      SQ Q9RC92
8. CPF0428-like [158737] (2)
  Pfam 06824; DUF1237
  1. Hypothetical protein BT3781 [158738]
    1. Bacteroides thetaiotaomicron [TaxId: 818] [158739] (2)
      SQ Q8A185 39-481
  2. Hypothetical protein CPF0428 [158740]
    1. Clostridium perfringens [TaxId: 1502] [158741] (1)
      SQ Q0TU05 2-427
9. Trehalase-like [158742] (1)
  Pham 01204
  1. Periplasmic trehalase TreA [158743]
    1. Escherichia coli [TaxId: 562] [158744] (2)
      SQ P13482 37-547
Seven-hairpin glycosidases [48225] (1)
uperfamily
1. Class I alpha-1;2-mannosidase, catalytic domain [48226] (5)
  1. Class I alpha-1;2-mannosidase, catalytic domain [48227]
    1. Baker's yeast (Saccharomyces cerevisiae) [TaxId: 4932] [48228] (2)
    2. Trichoderma reesei [TaxId: 51453] [69087] (1)
    3. Fungus (Penicillium citrinum) [TaxId: 5077] [69088] (7)
    4. Human (Homo sapiens) [TaxId: 9606] [48229] (4)
    5. Mouse (Mus musculus) [TaxId: 10090] [101367] (1)
Chondroitin AC/alginate lyase [48230] (2)
incomplete toroid
uperfamily
1. Alginate lyase A1-III [48231] (1)
  1. Alginate lyase A1-III [48232]
    1. Sphingomonas sp., A1 [TaxId: 28214] [48233] (2)
2. Hyaluronate lyase-like catalytic, N-terminal domain [48234] (6)
  1. Chondroitinase AC [48235]
    Chondroitin AC lyase
    1. Pedobacter heparinus (Flavobacterium heparinum) [TaxId: 984] [48236] (5)
    2. Arthrobacter aurescens [TaxId: 43663] [101368] (6)
  2. Hyaluronate lyase [48237]
    1. Streptococcus pneumoniae [TaxId: 1313] [48238] (19)
      SQ Q54873 287-1007
    2. Streptococcus agalactiae [TaxId: 1311] [69089] (3)
      preceded by a small all-beta Ig-like domain
  3. Xanthan lyase [89111]
    1. Bacillus sp. gl1 [TaxId: 84635] [89112] (7)
  4. Chondroitin ABC lyase I [89113]
    domain 2; preceded by a beta-domain of the galactose-binding domain-like fold
    1. Proteus vulgaris [TaxId: 585] [89114] (1)
Family 10 polysaccharide lyase [81853] (1)
uperfamily
1. Family 10 polysaccharide lyase [81854] (2)
  incomplete toroid made of four hairpins
  1. Polygalacturonic acid lyase (pectate lyase) [81855]
    1. Cellvibrio cellulosa [TaxId: 155077] [81856] (3)
    2. Azospirillum irakense [TaxId: 34011] [109956] (1)
      SQ Q9X592
Terpenoid cyclases/Protein prenyltransferases [48239] (4)
uperfamily
1. Terpenoid cyclase N-terminal domain [48240] (2)
  incomplete toroid made of four hairpins
  1. 5-Epi-aristolochene synthase [48241]
    1. Tobacco (Nicotiana tabacum) [TaxId: 4097] [48242] (7)
  2. (+)-bornyl diphosphate synthase [81857]
    1. Garden sage (Salvia officinalis) [TaxId: 38868] [81858] (7)
2. Terpene synthases [48243] (2)
  consists of two toroid domains: one of six and one of five hairpins
  1. Squalene-hopene cyclase [48244]
    1. Alicyclobacillus acidocaldarius [TaxId: 405212] [48245] (16)
  2. Lanosterol synthase [116989]
    1. Human (Homo sapiens) [TaxId: 9606] [116990] (2)
      SQ P48449
3. Protein prenyltransferases [48246] (3)
  1. Protein farnesyltransferase, beta-subunit [48247]
    1. Rat (Rattus norvegicus) [TaxId: 10116] [48248] (29)
      SQ Q02293 22-418 P53610
    2. Human (Homo sapiens) [TaxId: 9606] [69090] (19)
      SQ P49356
  2. Rab geranylgeranyltransferase, beta subunit [48249]
    1. Rat (Rattus norvegicus) [TaxId: 10116] [48250] (9)
4. Complement components [48251] (3)
  probably related to other families, but has no known enzymatic activity
  1. C3D, a C3 fragment and ligand for complement receptor 2 [48252]
    1. Human (Homo sapiens) [TaxId: 9606] [48253] (11)
    2. Rat (Rattus norvegicus) [TaxId: 10116] [48254] (2)
  2. C4adg fragment of complement factor C4a [81859]
    1. Human (Homo sapiens) [TaxId: 9606] [81860] (1)
LanC-like [158745] (1)
comprises seven hairpins
1. LanC-like [158746] (1)
  Pfam 05147; there are seven internal sequence repeats
  1. Nisin biosynthesis protein NisC [158747]
    1. Lactococcus lactis [TaxId: 1358] [158748] (2)
      SQ Q03202 7-415