1BH2
A326S MUTANT OF AN INHIBITORY ALPHA SUBUNIT
External Resource: Annotation
Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage
Chains | Domain Info | Class | Fold | Superfamily | Family | Domain | Species | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | d1bh2a1 | All alpha proteins | Transducin (alpha subunit), insertion domain | Transducin (alpha subunit), insertion domain | Transducin (alpha subunit), insertion domain | Transducin (alpha subunit), insertion domain | Norway rat (Rattus norvegicus ) [TaxId: 10116 ], | SCOPe (2.08) |
A | d1bh2a2 | Alpha and beta proteins (a/b) | P-loop containing nucleoside triphosphate hydrolases | P-loop containing nucleoside triphosphate hydrolases | G proteins | Transducin (alpha subunit) | Norway rat (Rattus norvegicus ) [TaxId: 10116 ], | SCOPe (2.08) |
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Chains | Type | Family Name | Domain Identifier | Family Identifier | Provenance Source (Version) |
---|---|---|---|---|---|
A | SCOP2B Superfamily | Ras-like P-loop GTPases | 8019719 | 3002022 | SCOP2B (2022-06-29) |
A | SCOP2B Superfamily | Galpha insert domain-like | 8056777 | 3000669 | SCOP2B (2022-06-29) |
A | SCOP2B Superfamily | Ras-like P-loop GTPases | 8019719 | 3002022 | 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 | G-alpha | e1bh2A1 | A: alpha arrays | X: Transducin (alpha subunit), insertion domain (From Topology) | H: Transducin (alpha subunit), insertion domain (From Topology) | T: Transducin (alpha subunit), insertion domain | F: G-alpha | ECOD (1.6) |
A | Ras | e1bh2A2 | A: a/b three-layered sandwiches | X: P-loop domains-like | H: P-loop domains-related | T: P-loop containing nucleoside triphosphate hydrolases | F: Ras | ECOD (1.6) |
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.40.50.300 | Alpha Beta | 3-Layer(aba) Sandwich | Rossmann fold | P-loop containing nucleotide triphosphate hydrolases | CATH (4.3.0) |
A | 1.10.400.10 | Mainly Alpha | Orthogonal Bundle | GI Alpha 1, domain 2-like | GI Alpha 1, domain 2-like | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF00503 | G-protein alpha subunit (G-alpha) | G-protein alpha subunit | G proteins couple receptors of extracellular signals to intracellular signaling pathways. The G protein alpha subunit binds guanyl nucleotide and is a weak GTPase. A set of residues that are unique to G-alpha as compared to its ancestor the Arf-like ... | Domain |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR001019 | Guanine nucleotide binding protein (G-protein), alpha subunit | Family | |
IPR011025 | G protein alpha subunit, helical insertion | Homologous Superfamily | |
IPR027417 | P-loop containing nucleoside triphosphate hydrolase | Homologous Superfamily | |
IPR001408 | G-protein alpha subunit, group I | Family |
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
G-protein alpha subunit, group I (GTPase) M-CSA #533 | The alpha subunits of heterotrimeric G proteins are members of the Ras superfamily of GTP hydrolases and function in signal transduction. They are activated by replacement of bound GDP by GTP, a process promoted by activated 7-transmembrane receptors, and by subsequent dissociation of the alpha subunit from the beta and gamma subunits. The G-alpha subunit remains active until its GTPase activity converts the bound GTP back to GDP. The alpha subunit of the G protein Gi1 is expressed in many different tissues and is activated by the alpha-2 adrenergic and M-2 muscarinic cholinergic receptors, amongst others. Its downstream effectors include particular isoforms of adenylate cyclase; types V and VI are particularly sensitive to inhibition by G-alpha-i1. The mechanism of enzymatic GTP hydrolysis (and similar phosphoryl transfer reactions) has been subject to significant debate and still remains to be firmly established. More recent models have proposed a dissociative-like process, in which the transition state shows significant cleavage of the gamma-beta phosphoanhydride bond and relatively little bond formation between the gamma phosphate and the nucleophilic water molecule. (See, for example, the reference pubmed ID 15236956 for a recent discussion). | Defined by 5 residues: GLU:A-12 [auth A-43]THR:A-17 [auth A-48]ARG:A-147 [auth A-178]ASP:A-169 [auth A-200]GLN:A-173 [auth A-204] | EC: 3.6.5 (UniProt) |