Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1n0ha1 Alpha and beta proteins (a/b) DHS-like NAD/FAD-binding domain DHS-like NAD/FAD-binding domain Pyruvate oxidase and decarboxylase, middle domain Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)
Ad1n0ha2 Alpha and beta proteins (a/b) Thiamin diphosphate-binding fold (THDP-binding) Thiamin diphosphate-binding fold (THDP-binding) Pyruvate oxidase and decarboxylase Pyr module Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)
Ad1n0ha3 Alpha and beta proteins (a/b) Thiamin diphosphate-binding fold (THDP-binding) Thiamin diphosphate-binding fold (THDP-binding) Pyruvate oxidase and decarboxylase PP module Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)
Bd1n0hb1 Alpha and beta proteins (a/b) DHS-like NAD/FAD-binding domain DHS-like NAD/FAD-binding domain Pyruvate oxidase and decarboxylase, middle domain Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)
Bd1n0hb2 Alpha and beta proteins (a/b) Thiamin diphosphate-binding fold (THDP-binding) Thiamin diphosphate-binding fold (THDP-binding) Pyruvate oxidase and decarboxylase Pyr module Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)
Bd1n0hb3 Alpha and beta proteins (a/b) Thiamin diphosphate-binding fold (THDP-binding) Thiamin diphosphate-binding fold (THDP-binding) Pyruvate oxidase and decarboxylase PP module Acetohydroxyacid synthase catalytic subunit baker's yeast (Saccharomyces cerevisiae ) [TaxId: 4932 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyThiamin diphosphate-binding fold (THDP-binding) 8042435 3001790 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyThiamin diphosphate-binding fold (THDP-binding) 8042434 3001790 SCOP2B (2022-06-29)
ASCOP2B SuperfamilyDHS-like NAD/FAD-binding domain 8042432 3001728 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyThiamin diphosphate-binding fold (THDP-binding) 8042434 3001790 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyThiamin diphosphate-binding fold (THDP-binding) 8042435 3001790 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyDHS-like NAD/FAD-binding domain 8042432 3001728 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ATPP_enzyme_Me1n0hA1 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: DHS-like NAD/FAD-binding domainF: TPP_enzyme_MECOD (1.6)
ATPP_enzyme_Ce1n0hA3 A: a/b three-layered sandwichesX: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)T: Thiamin diphosphate-binding fold (THDP-binding)F: TPP_enzyme_CECOD (1.6)
ATPP_enzyme_Ne1n0hA2 A: a/b three-layered sandwichesX: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)T: Thiamin diphosphate-binding fold (THDP-binding)F: TPP_enzyme_NECOD (1.6)
BTPP_enzyme_Me1n0hB1 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: DHS-like NAD/FAD-binding domainF: TPP_enzyme_MECOD (1.6)
BTPP_enzyme_Ce1n0hB3 A: a/b three-layered sandwichesX: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)T: Thiamin diphosphate-binding fold (THDP-binding)F: TPP_enzyme_CECOD (1.6)
BTPP_enzyme_Ne1n0hB2 A: a/b three-layered sandwichesX: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)T: Thiamin diphosphate-binding fold (THDP-binding)F: TPP_enzyme_NECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF00205Thiamine pyrophosphate enzyme, central domain (TPP_enzyme_M)Thiamine pyrophosphate enzyme, central domainThe central domain of TPP enzymes contains a 2-fold Rossman fold.Domain
A, B
PF02775Thiamine pyrophosphate enzyme, C-terminal TPP binding domain (TPP_enzyme_C)Thiamine pyrophosphate enzyme, C-terminal TPP binding domain- Domain
A, B
PF02776Thiamine pyrophosphate enzyme, N-terminal TPP binding domain (TPP_enzyme_N)Thiamine pyrophosphate enzyme, N-terminal TPP binding domain- Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
Acetolactate synthase

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
A, B
acetolactate synthase (biosynthetic)  M-CSA #289

Acetolactate synthase is a thiamin pyrophosphate-dependent enzyme that combines two molecules of pyruvate in a stereospecific condensation to yield 2-acetolactate with the release of carbon dioxide. Only the S enantiomer of 2-acetolactate is formed, which is then relayed into the biosynthesis of valine and leucine. Previously it was though that this protein also requires FAD for the protein to fold correctly, although the FAD is not involved in the reaction itself however recent studies (Lonhienne T et al.) have shown that it is involved in reaction by producing the radical that initiates this reaction. It exists in two distinct forms (biosynthetic and catabolic). This entry represents the biosynthetic form that is found in plants, fungi and bacteria.

Defined by 5 residues: GLU:A-129 [auth A-139]PHE:A-191 [auth A-201]GLN:A-192 [auth A-202]LYS:A-241 [auth A-251]MET:B-572 [auth B-582]
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