O50235 · CARA_ZYMMO
- ProteinCarbamoyl phosphate synthase small chain
- GenecarA
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids374 (go to sequence)
- Protein existenceInferred from homology
- Annotation score4/5
Function
function
Small subunit of the glutamine-dependent carbamoyl phosphate synthetase (CPSase). CPSase catalyzes the formation of carbamoyl phosphate from the ammonia moiety of glutamine, carbonate, and phosphate donated by ATP, constituting the first step of 2 biosynthetic pathways, one leading to arginine and/or urea and the other to pyrimidine nucleotides. The small subunit (glutamine amidotransferase) binds and cleaves glutamine to supply the large subunit with the substrate ammonia.
Catalytic activity
- 2 ATP + H2O + hydrogencarbonate + L-glutamine = 2 ADP + carbamoyl phosphate + 2 H+ + L-glutamate + phosphate
Carbamoyl phosphate synthase small chain
H2O + L-glutamine = L-glutamate + NH4+
Pathway
Amino-acid biosynthesis; L-arginine biosynthesis; carbamoyl phosphate from bicarbonate: step 1/1.
Pyrimidine metabolism; UMP biosynthesis via de novo pathway; (S)-dihydroorotate from bicarbonate: step 1/3.
Features
Showing features for binding site, active site.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Binding site | 41 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: S | ||||||
Binding site | 235 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 237 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Active site | 264 | Nucleophile | ||||
Sequence: C | ||||||
Binding site | 265 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: L | ||||||
Binding site | 268 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: Q | ||||||
Binding site | 306 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: N | ||||||
Binding site | 308 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 309 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: F | ||||||
Active site | 348 | |||||
Sequence: H | ||||||
Active site | 350 | |||||
Sequence: E |
GO annotations
Aspect | Term | |
---|---|---|
Molecular Function | ATP binding | |
Molecular Function | carbamoyl-phosphate synthase (glutamine-hydrolyzing) activity | |
Molecular Function | glutaminase activity | |
Biological Process | 'de novo' pyrimidine nucleobase biosynthetic process | |
Biological Process | 'de novo' UMP biosynthetic process | |
Biological Process | arginine biosynthetic process | |
Biological Process | glutamine metabolic process |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Protein family/group databases
Names & Taxonomy
Protein names
- Recommended nameCarbamoyl phosphate synthase small chain
- EC number
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageBacteria > Pseudomonadota > Alphaproteobacteria > Sphingomonadales > Zymomonadaceae > Zymomonas
Accessions
- Primary accessionO50235
- Secondary accessions
Proteomes
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_0000112354 | 1-374 | Carbamoyl phosphate synthase small chain | |||
Sequence: MVLADGQMIWGRGFGATGAKVGEVCFHTAMTGYEEIMTDPSFASQIINFTFPHIGNVGANREDVEAKTLHALGCIVREDVTAPSNFRSLWRFDSWLKDHDRIGLAGVDTRALTGLLRKKGAQNAVIAHDPKGQFDIPALIETARSWAGLQGMDLARSVSTHQSYNWQEGIWSLQNGYSVVDNQKGPHVVAIDYGLKHNILRNLVEAGARVTVVKATASFDEVMAHKPDGVFLSNGPGDPAATAEYAVPVIRQLLDIKMPIFGICLGHQLLALAVGATTYKMHQGHRGANHPVKRLDDSKVEITSMNHGFAVATDSLPEQARPTHLSLFDGSLAGLELTDRPAFSVQYHPEASPGPQDSYYLFTKFIDLIAKERP |
Interaction
Subunit
Composed of two chains; the small (or glutamine) chain promotes the hydrolysis of glutamine to ammonia, which is used by the large (or ammonia) chain to synthesize carbamoyl phosphate. Tetramer of heterodimers (alpha,beta)4.
Protein-protein interaction databases
Structure
Family & Domains
Features
Showing features for region, domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Region | 1-183 | CPSase | ||||
Sequence: MVLADGQMIWGRGFGATGAKVGEVCFHTAMTGYEEIMTDPSFASQIINFTFPHIGNVGANREDVEAKTLHALGCIVREDVTAPSNFRSLWRFDSWLKDHDRIGLAGVDTRALTGLLRKKGAQNAVIAHDPKGQFDIPALIETARSWAGLQGMDLARSVSTHQSYNWQEGIWSLQNGYSVVDNQ | ||||||
Domain | 187-374 | Glutamine amidotransferase type-1 | ||||
Sequence: HVVAIDYGLKHNILRNLVEAGARVTVVKATASFDEVMAHKPDGVFLSNGPGDPAATAEYAVPVIRQLLDIKMPIFGICLGHQLLALAVGATTYKMHQGHRGANHPVKRLDDSKVEITSMNHGFAVATDSLPEQARPTHLSLFDGSLAGLELTDRPAFSVQYHPEASPGPQDSYYLFTKFIDLIAKERP |
Sequence similarities
Belongs to the CarA family.
Keywords
- Domain
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length374
- Mass (Da)40,808
- Last updated2002-07-11 v2
- Checksum4C6BFA63818FE09E
Sequence caution
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AF086791 EMBL· GenBank· DDBJ | AAC70355.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation | |
AE008692 EMBL· GenBank· DDBJ | AAV90242.1 EMBL· GenBank· DDBJ | Genomic DNA | Different initiation |