Q5WEX1 · Q5WEX1_SHOC1
- ProteinCarbamoyl phosphate synthase small chain
- GenecarA
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids360 (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
- 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 | 45 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: S | ||||||
Binding site | 217 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 219 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Active site | 244 | Nucleophile | ||||
Sequence: C | ||||||
Binding site | 245 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: L | ||||||
Binding site | 248 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: Q | ||||||
Binding site | 286 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: N | ||||||
Binding site | 289 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: Y | ||||||
Active site | 329 | |||||
Sequence: H | ||||||
Active site | 331 | |||||
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 > Bacillota > Bacilli > Bacillales > Bacillaceae > Shouchella
Accessions
- Primary accessionQ5WEX1
Proteomes
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 domain, region.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 1-131 | Carbamoyl-phosphate synthase small subunit N-terminal | ||||
Sequence: MKGSIVLETGETFVGNWHGEPKQVEGEIVFFTGMTGYQEVITDPSFKGQIVVFTYPLIGNYGVNESDFESSKPQVEGVIVCEAASDPSHWKMKKSVVDYLSEHRIPYMSGVDTRAIVKRIRQHGDMRAVLT | ||||||
Region | 1-168 | CPSase | ||||
Sequence: MKGSIVLETGETFVGNWHGEPKQVEGEIVFFTGMTGYQEVITDPSFKGQIVVFTYPLIGNYGVNESDFESSKPQVEGVIVCEAASDPSHWKMKKSVVDYLSEHRIPYMSGVDTRAIVKRIRQHGDMRAVLTTDSRNANVQETRLLSDKFVVADVSVTEPVVYNATGTT |
Sequence similarities
Belongs to the CarA family.
Keywords
- Domain
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length360
- Mass (Da)39,553
- Last updated2004-11-23 v1
- ChecksumC63E62349A176C9A
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AP006627 EMBL· GenBank· DDBJ | BAD65089.1 EMBL· GenBank· DDBJ | Genomic DNA |