Q04ZG6 · CARA_LEPBL
- ProteinCarbamoyl phosphate synthase small chain
- GenecarA
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids363 (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 | 45 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: S | ||||||
Binding site | 224 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 226 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Active site | 252 | Nucleophile | ||||
Sequence: C | ||||||
Binding site | 253 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: L | ||||||
Binding site | 256 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: Q | ||||||
Binding site | 294 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: N | ||||||
Binding site | 296 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: G | ||||||
Binding site | 297 | L-glutamine (UniProtKB | ChEBI) | ||||
Sequence: F | ||||||
Active site | 335 | |||||
Sequence: H | ||||||
Active site | 337 | |||||
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
Names & Taxonomy
Protein names
- Recommended nameCarbamoyl phosphate synthase small chain
- EC number
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageBacteria > Spirochaetota > Spirochaetia > Leptospirales > Leptospiraceae > Leptospira
Accessions
- Primary accessionQ04ZG6
PTM/Processing
Features
Showing features for chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Chain | PRO_1000138865 | 1-363 | Carbamoyl phosphate synthase small chain | |||
Sequence: MKAFLVLDNGMILEGESFGYESESVGEIVFNTSMAGYQEILTDPSYCNQIITLTYPMIGNYGIHPDNMESSKIQASGLIVREYVDLPSNFMSQKTLSKFLKEYQIPAIQGIDTRKLTRYIRTNGSPNGGIFVAREYSPEFLEKVKSFPGITGTDLAKVVTTSTKYIFGTHTGKKYKLAVYDYGVKTNILRLLDAAGFAVTVYPALTPAEEIMKEGTDAFFLSNGPGDPAPLDYAIDATRKIMEKGYPLFGICLGHQIIGLSLGKKTEKMKFGHRGGNQPVKNLSTGQVEITSQNHGFAVIDDGKSSEPVSFLNLNDNTVEGILKSGYPLLTVQYHPESAPGPNDSRYLFQKFYDLVETTKRGK |
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.
Structure
Family & Domains
Features
Showing features for region, domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Region | 1-172 | CPSase | ||||
Sequence: MKAFLVLDNGMILEGESFGYESESVGEIVFNTSMAGYQEILTDPSYCNQIITLTYPMIGNYGIHPDNMESSKIQASGLIVREYVDLPSNFMSQKTLSKFLKEYQIPAIQGIDTRKLTRYIRTNGSPNGGIFVAREYSPEFLEKVKSFPGITGTDLAKVVTTSTKYIFGTHTG | ||||||
Domain | 176-362 | Glutamine amidotransferase type-1 | ||||
Sequence: KLAVYDYGVKTNILRLLDAAGFAVTVYPALTPAEEIMKEGTDAFFLSNGPGDPAPLDYAIDATRKIMEKGYPLFGICLGHQIIGLSLGKKTEKMKFGHRGGNQPVKNLSTGQVEITSQNHGFAVIDDGKSSEPVSFLNLNDNTVEGILKSGYPLLTVQYHPESAPGPNDSRYLFQKFYDLVETTKRG |
Sequence similarities
Belongs to the CarA family.
Keywords
- Domain
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length363
- Mass (Da)40,053
- Last updated2006-11-14 v1
- Checksum7FF0D5ACCBC09CD4
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
CP000348 EMBL· GenBank· DDBJ | ABJ79529.1 EMBL· GenBank· DDBJ | Genomic DNA |