Structural Classification of Proteins

Fold: T-fold

: beta(2)-alpha(2)-beta(2); 2 layers: alpha/beta; antiparallel sheet 1234
tunnel-shaped: its known members form wide oligomeric barrels different sizes

Lineage:

Root: scop
Class: Alpha and beta proteins (a+b) [53931]
Mainly antiparallel beta sheets (segregated alpha and beta regions)
Fold: T-fold [55619]
beta(2)-alpha(2)-beta(2); 2 layers: alpha/beta; antiparallel sheet 1234
tunnel-shaped: its known members form wide oligomeric barrels different sizes

Superfamilies:

Tetrahydrobiopterin biosynthesis enzymes-like [55620] (4)
bind purine or pterin in topologically similar sites between subunits
uperfamily
1. GTP cyclohydrolase I [55621] (4)
  1. GTP cyclohydrolase I [55622]
    beta-sheets of five subunits form a barrel, closed: n=20, S=20
    1. Escherichia coli [TaxId: 562] [55623] (7)
    2. Human (Homo sapiens) [TaxId: 9606] [55624] (1)
    3. Rat (Rattus norvegicus) [TaxId: 10116] [69790] (3)
      SQ P22288
    4. Thermus thermophilus [TaxId: 274] [143627] (15)
      SQ Q5SH52 32-216
2. 6-pyruvoyl tetrahydropterin synthase [55625] (4)
  1. 6-pyruvoyl tetrahydropterin synthase [55626]
    beta-sheets of three subunits form a barrel, closed: n=12, S=12
    1. Rat (Rattus norvegicus) [TaxId: 10116] [55627] (3)
    2. Plasmodium falciparum [TaxId: 5833] [118057] (1)
      SQ Q6LEZ4
    3. Caenorhabditis elegans [TaxId: 6239] [143628] (1)
      SQ O02058 1-139
    4. Plasmodium vivax [TaxId: 5855] [143629] (2)
      73% similarity to the Plasmodium falciparum enzyme
3. DHN aldolase/epimerase [55628] (4)
  beta-sheets of four subunits form a barrel, closed: n=16, S=16
  1. 7,8-dihydroneopterin aldolase [55629]
    1. Staphylococcus aureus [TaxId: 1280] [55630] (15)
      SQ P56740
    2. Bacteria (Mycobacterium tuberculosis) [TaxId: 1773] [103143] (2)
      SQ O06275 2-115
    3. Thale cress (Arabidopsis thaliana) [TaxId: 3702] [111088] (1)
      SQ Q9SF23
  2. 7,8-dihydroneopterin triphosphate epimerase [55631]
    1. Escherichia coli [TaxId: 562] [55632] (1)
4. Urate oxidase (uricase) [55633] (3)
  1. Urate oxidase (uricase) [55634]
    duplication: one subunit consists of two domains of this fold; beta-sheets of two subunits form a barrel, closed: n=16, S=16
    1. Aspergillus flavus [TaxId: 5059] [55635] (72)
    2. Bacillus sp., strain TB-90 [TaxId: 1409] [111089] (1)
      SQ Q45697 177-482
    3. Arthrobacter globiformis [TaxId: 1665] [143630] (96)
ApbE-like [143631] (2)
duplication: contains two differently decorated beta(2)-alpha(2)-beta(2) subdomains, similar to other T-fold domains; probably does not form the tunnel-shaped oligomers
uperfamily
1. ApbE-like [143632] (1)
  Pfam 02424
  1. Hypothetical protein TM1553 [143633]
    1. Thermotoga maritima [TaxId: 2336] [143634] (1)
      SQ Q9X1N9 44-352
2. DVU1097-like [160566] (1)
  Pfam 04040; DUF375
  1. Hypothetical protein DVU1097 [160567]
    1. Desulfovibrio vulgaris [TaxId: 881] [160568] (1)
      SQ Q72D34 1-248