Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyADC synthase8024523 4002317 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyADC synthase8036902 3001093 SCOP2 (2022-06-29)
BSCOP2 FamilyClass I glutamine amidotransferases (GAT)8031778 4003747 SCOP2 (2022-06-29)
BSCOP2 SuperfamilyClass I glutamine amidotransferase-like8044156 3001405 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APF00425,PF04715e1qdlA1 A: a+b duplicates or obligate multimersX: ADC synthase (From Topology)H: ADC synthase (From Topology)T: ADC synthaseF: PF00425,PF04715ECOD (1.6)
BPF00117e1qdlB1 A: a/b three-layered sandwichesX: Flavodoxin-likeH: Class I glutamine amidotransferase-likeT: Class I glutamine amidotransferase-likeF: PF00117ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.60.120.10 Alpha Beta 4-Layer Sandwich Anthranilate synthase Anthranilate synthaseCATH (4.3.0)
B3.40.50.880 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Class I glutamine amidotransferase (GATase) domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF00425chorismate binding enzyme (Chorismate_bind)chorismate binding enzyme- Family
PF04715Anthranilate synthase component I, N terminal region (Anth_synt_I_N)Anthranilate synthase component I, N terminal region- Family
PF00117Glutamine amidotransferase class-I (GATase)Glutamine amidotransferase class-I- Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
PROTEIN (ANTHRANILATE SYNTHASE (TRPE-SUBUNIT)) -
PROTEIN (ANTHRANILATE SYNTHASE (TRPG-SUBUNIT)) -

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

ChainsEnzyme NameDescriptionCatalytic Residues
A, B
anthranilate synthase  M-CSA #314

Anthranilate synthase catalyses the initial reaction in tryptophan biosynthesis in microorganisms and plants. This enzyme is one of a family of glutamine amidotransferases, enzymes that utilise the amide of glutamine in the biosynthesis of amino acids, nucleotides, coenzymes, and an amino sugar. Glutamine amidotransferases thus exert major role in utilisation of assimilated nitrogen. Anthranilate synthase is the most thoroughly characterised glutamine amidotransferase.

The enzyme from Serratia marcescens is a heterotetramer of anthranilate synthase (TrpE) and glutamine amidotransferase (TrpG) subunits both of which are required for function.

Defined by 10 residues: HIS:A-307 [auth A-306]THR:A-334 [auth A-333]TYR:A-358 [auth A-357]ARG:A-378 [auth A-377]GLY:A-394 [auth A-393]GLY:B-56CYS:B-84LEU:B-85HIS:B-175GLU:B-177
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