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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1ea0a1 All beta proteins Single-stranded right-handed beta-helix Alpha subunit of glutamate synthase, C-terminal domain Alpha subunit of glutamate synthase, C-terminal domain Alpha subunit of glutamate synthase, C-terminal domain (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)
Ad1ea0a2 Alpha and beta proteins (a/b) TIM beta/alpha-barrel FMN-linked oxidoreductases FMN-linked oxidoreductases Alpha subunit of glutamate synthase, central and FMN domains (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)
Ad1ea0a3 Alpha and beta proteins (a+b) Ntn hydrolase-like N-terminal nucleophile aminohydrolases (Ntn hydrolases) Class II glutamine amidotransferases Alpha subunit of glutamate synthase, N-terminal domain (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)
Bd1ea0b1 All beta proteins Single-stranded right-handed beta-helix Alpha subunit of glutamate synthase, C-terminal domain Alpha subunit of glutamate synthase, C-terminal domain Alpha subunit of glutamate synthase, C-terminal domain (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)
Bd1ea0b2 Alpha and beta proteins (a/b) TIM beta/alpha-barrel FMN-linked oxidoreductases FMN-linked oxidoreductases Alpha subunit of glutamate synthase, central and FMN domains (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)
Bd1ea0b3 Alpha and beta proteins (a+b) Ntn hydrolase-like N-terminal nucleophile aminohydrolases (Ntn hydrolases) Class II glutamine amidotransferases Alpha subunit of glutamate synthase, N-terminal domain (Azospirillum brasilense ) [TaxId: 192 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyAlpha subunit of glutamate synthase, GAT domain-like 8056845 4000340 SCOP2 (2022-06-29)
ASCOP2 FamilyGltS central region-like 8056847 4003980 SCOP2 (2022-06-29)
ASCOP2 FamilyGXGXG-motif containing domain 8056849 4000235 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyClass II glutamine amidotransferases 8056846 3000131 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyFMN-linked oxidoreductases 8056848 3000014 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyGXGXG domain-like 8056850 3000109 SCOP2 (2022-06-29)
BSCOP2B SuperfamilyFMN-linked oxidoreductases 8056848 3000014 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyGXGXG domain-like 8056850 3000109 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyClass II glutamine amidotransferases 8056846 3000131 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AGXGXGe1ea0A2 A: beta duplicates or obligate multimersX: Single-stranded right-handed beta-helixH: Alpha subunit of glutamate synthase-C (From Topology)T: Alpha subunit of glutamate synthase-CF: GXGXGECOD (1.6)
AGATase_2_2nde1ea0A1 A: a+b two layersX: Alpha-beta plaitsH: Alpha subunit of glutamate synthase, insertion domain (From Topology)T: Alpha subunit of glutamate synthase, insertion domainF: GATase_2_2ndECOD (1.6)
AGATase_2_1ste1ea0A3 A: a+b four layersX: Ntn/PP2CH: NtnT: Class II glutamine amidotransferasesF: GATase_2_1stECOD (1.6)
AGlu_synthasee1ea0A4 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: Glu_synthaseECOD (1.6)
AGlu_syn_centrale1ea0A5 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: Glu_syn_centralECOD (1.6)
BGXGXGe1ea0B2 A: beta duplicates or obligate multimersX: Single-stranded right-handed beta-helixH: Alpha subunit of glutamate synthase-C (From Topology)T: Alpha subunit of glutamate synthase-CF: GXGXGECOD (1.6)
BGATase_2_2nde1ea0B1 A: a+b two layersX: Alpha-beta plaitsH: Alpha subunit of glutamate synthase, insertion domain (From Topology)T: Alpha subunit of glutamate synthase, insertion domainF: GATase_2_2ndECOD (1.6)
BGATase_2_1ste1ea0B3 A: a+b four layersX: Ntn/PP2CH: NtnT: Class II glutamine amidotransferasesF: GATase_2_1stECOD (1.6)
BGlu_synthasee1ea0B4 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: Glu_synthaseECOD (1.6)
BGlu_syn_centrale1ea0B5 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: Glu_syn_centralECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF01645Conserved region in glutamate synthase (Glu_synthase)Conserved region in glutamate synthaseThis family represents a region of the glutamate synthase protein. This region is expressed as a separate subunit in the glutamate synthase alpha subunit from archaebacteria, or part of a large multidomain enzyme in other organisms. The aligned regi ...This family represents a region of the glutamate synthase protein. This region is expressed as a separate subunit in the glutamate synthase alpha subunit from archaebacteria, or part of a large multidomain enzyme in other organisms. The aligned region of these proteins contains a putative FMN binding site and Fe-S cluster.
Domain
A, B
PF01493GXGXG motif (GXGXG)GXGXG motif- Family
A, B
PF00310Glutamine amidotransferases class-II (GATase_2)Glutamine amidotransferases class-II- Domain
A, B
PF04898Glutamate synthase central domain (Glu_syn_central)Glutamate synthase central domainThe central domain of glutamate synthase connects the amino terminal amidotransferase domain with the FMN-binding domain and has an alpha / beta overall topology [1]. This domain appears to be a rudimentary form of the FMN-binding TIM barrel accordi ...The central domain of glutamate synthase connects the amino terminal amidotransferase domain with the FMN-binding domain and has an alpha / beta overall topology [1]. This domain appears to be a rudimentary form of the FMN-binding TIM barrel according to SCOP.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN -

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

ChainsEnzyme NameDescriptionCatalytic Residues
glutamate synthase (NADPH)  M-CSA #304

Binds FMN, FAD, 2 [4Fe-4S] clusters and 1 [3Fe-4S] cluster. The protein is composed of two subunits, alpha and beta. The alpha subunit is composed of two domains, one hydrolysing L-glutamine to ammonia and L-glutamate, the other combining the produced ammonia with 2-oxoglutarate to produce a second molecule of L-glutamate (cf. EC 1.4.1.4, glutamate dehydrogenase [NADP+]). The ammonia is channelled through a 31 Å channel in the active protein. This entry represents the alpha subunit reaction.

Glutamine hydrolysis is absent (or negligible) in the absence of the other substrates. The enzyme also catalyses the oxidation of NADPH, the ammonia-dependent synthesis of glutamate from 2-oxoglutarate and ammonia and the oxidation of L-glutamate in the presence of iodonitrotetrazolium salts, the latter two of which only occur at high pH. There is still much to be determined with respect to the mechanism of this enzyme [PMID:18421771] as well as how the cross-control of the synthase and glutaminase activities occurs with such precision. This enzyme utilises three iron-sulfur clusters (two Fe4S4 and one Fe3S4) as well as FMN and FAD as cofactors.

Defined by 6 residues: CYS:A-1ASN:A-231GLY:A-232MET:A-479GLU:A-886LYS:A-937
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Explore in 3DM-CSA Motif Definition
Extent of motif is too large to support Structure Motif searching.
EC: 1.4.1.13 (PDB Primary Data)