Annotations: 1EA0

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1ea0a1	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)
A	d1ea0a2	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)
A	d1ea0a3	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)
B	d1ea0b1	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)
B	d1ea0b2	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)
B	d1ea0b3	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

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Alpha subunit of glutamate synthase, GAT domain-like	8056845	4000340	SCOP2 (2022-06-29)
A	SCOP2 Family	GltS central region-like	8056847	4003980	SCOP2 (2022-06-29)
A	SCOP2 Family	GXGXG-motif containing domain	8056849	4000235	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Class II glutamine amidotransferases	8056846	3000131	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	FMN-linked oxidoreductases	8056848	3000014	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	GXGXG domain-like	8056850	3000109	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	FMN-linked oxidoreductases	8056848	3000014	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	GXGXG domain-like	8056850	3000109	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Class II glutamine amidotransferases	8056846	3000131	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	GXGXG	e1ea0A2	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Alpha subunit of glutamate synthase-C (From Topology)	T: Alpha subunit of glutamate synthase-C	F: GXGXG	ECOD (1.6)
A	GATase_2_2nd	e1ea0A1	A: a+b two layers	X: Alpha-beta plaits	H: Alpha subunit of glutamate synthase, insertion domain (From Topology)	T: Alpha subunit of glutamate synthase, insertion domain	F: GATase_2_2nd	ECOD (1.6)
A	GATase_2_1st	e1ea0A3	A: a+b four layers	X: Ntn/PP2C	H: Ntn	T: Class II glutamine amidotransferases	F: GATase_2_1st	ECOD (1.6)
A	Glu_synthase	e1ea0A4	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Glu_synthase	ECOD (1.6)
A	Glu_syn_central	e1ea0A5	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Glu_syn_central	ECOD (1.6)
B	GXGXG	e1ea0B2	A: beta duplicates or obligate multimers	X: Single-stranded right-handed beta-helix	H: Alpha subunit of glutamate synthase-C (From Topology)	T: Alpha subunit of glutamate synthase-C	F: GXGXG	ECOD (1.6)
B	GATase_2_2nd	e1ea0B1	A: a+b two layers	X: Alpha-beta plaits	H: Alpha subunit of glutamate synthase, insertion domain (From Topology)	T: Alpha subunit of glutamate synthase, insertion domain	F: GATase_2_2nd	ECOD (1.6)
B	GATase_2_1st	e1ea0B3	A: a+b four layers	X: Ntn/PP2C	H: Ntn	T: Class II glutamine amidotransferases	F: GATase_2_1st	ECOD (1.6)
B	Glu_synthase	e1ea0B4	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Glu_synthase	ECOD (1.6)
B	Glu_syn_central	e1ea0B5	A: a/b barrels	X: TIM beta/alpha-barrel	H: TIM barrels (From Topology)	T: TIM barrels	F: Glu_syn_central	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.60.20.10	Alpha Beta	4-Layer Sandwich	Glutamine Phosphoribosylpyrophosphate, subunit 1, domain 1	Aminohydrolase, N-terminal nucleophile (Ntn) domain	CATH (4.3.0)
A	3.20.20.70	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Aldolase class I	CATH (4.3.0)
A	2.160.20.60	Mainly Beta	3 Solenoid	Pectate Lyase C-like	Glutamate synthase, alpha subunit, C-terminal domain	CATH (4.3.0)
B	3.60.20.10	Alpha Beta	4-Layer Sandwich	Glutamine Phosphoribosylpyrophosphate, subunit 1, domain 1	Aminohydrolase, N-terminal nucleophile (Ntn) domain	CATH (4.3.0)
B	3.20.20.70	Alpha Beta	Alpha-Beta Barrel	TIM Barrel	Aldolase class I	CATH (4.3.0)
B	2.160.20.60	Mainly Beta	3 Solenoid	Pectate Lyase C-like	Glutamate synthase, alpha subunit, C-terminal domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01645	Conserved region in glutamate synthase (Glu_synthase)	Conserved region in glutamate synthase	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 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	PF01493	GXGXG motif (GXGXG)	GXGXG motif	-	Family
A, B	PF00310	Glutamine amidotransferases class-II (GATase_2)	Glutamine amidotransferases class-II	-	Domain
A, B	PF04898	Glutamate synthase central domain (Glu_syn_central)	Glutamate synthase central domain	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 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

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN	oxidoreductase activity, acting on the CH-NH2 group of donors glutamate synthase activity, NAD(P)H as acceptor oxidoreductase activity glutamate synthase (NADPH) activity oxidoreductase activity, acting on the CH-NH2 group of donors, NAD or NADP as acceptor catalytic activity glutamate synthase activity iron-sulfur cluster binding binding 3 iron, 4 sulfur cluster binding metal cluster binding small molecule binding cation binding ion binding oxidoreductase activity, acting on the CH-NH2 group of donors glutamate synthase activity, NAD(P)H as acceptor oxidoreductase activity glutamate synthase (NADPH) activity oxidoreductase activity, acting on the CH-NH2 group of donors, NAD or NADP as acceptor catalytic activity glutamate synthase activity iron-sulfur cluster binding binding 3 iron, 4 sulfur cluster binding metal cluster binding small molecule binding cation binding ion binding metal ion binding	oxoacid metabolic process glutamine family amino acid biosynthetic process cellular biosynthetic process amino acid metabolic process organic acid metabolic process organic acid biosynthetic process L-glutamate biosynthetic process alpha-amino acid metabolic process carboxylic acid biosynthetic process glutamine family amino acid metabolic process glutamate metabolic process small molecule metabolic process dicarboxylic acid biosynthetic process small molecule biosynthetic process oxoacid metabolic process glutamine family amino acid biosynthetic process cellular biosynthetic process amino acid metabolic process organic acid metabolic process organic acid biosynthetic process L-glutamate biosynthetic process alpha-amino acid metabolic process carboxylic acid biosynthetic process glutamine family amino acid metabolic process glutamate metabolic process small molecule metabolic process dicarboxylic acid biosynthetic process small molecule biosynthetic process cellular metabolic process dicarboxylic acid metabolic process carboxylic acid metabolic process primary metabolic process L-amino acid biosynthetic process L-amino acid metabolic process proteinogenic amino acid metabolic process amino acid biosynthetic process biosynthetic process proteinogenic amino acid biosynthetic process metabolic process cellular process glutamate biosynthetic process alpha-amino acid biosynthetic process glutamine metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR029055	Nucleophile aminohydrolases, N-terminal	Homologous Superfamily
A, B	IPR013785	Aldolase-type TIM barrel	Homologous Superfamily
A, B	IPR036485	Glutamate synthase, alpha subunit, C-terminal domain superfamily	Homologous Superfamily
A, B	IPR006982	Glutamate synthase, central-N	Domain
A, B	IPR002489	Glutamate synthase, alpha subunit, C-terminal	Domain
A, B	IPR017932	Glutamine amidotransferase type 2 domain	Domain
A, B	IPR002932	Glutamate synthase domain	Domain
A, B	IPR050711	Electron transfer and nitrogen metabolism enzyme	Family

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

Chains	Enzyme Name	Description	Catalytic Residues
A	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 \| Explore in 3D: M-CSA Motif Definition Extent of motif is too large to support Structure Motif searching. EC: 1.4.1.13 (PDB Primary Data)

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.