A0A1Z1M4N4 · A0A1Z1M4N4_OSMFI
- ProteinCarbamoyl phosphate synthase small chain
- GenecarA
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids391 (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
- hydrogencarbonate + L-glutamine + 2 ATP + H2O = carbamoyl phosphate + L-glutamate + 2 ADP + phosphate + 2 H+
- L-glutamine + H2O = 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 | 52 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 248 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 250 | L-glutamine (UniProtKB | ChEBI) | |||
Active site | 277 | Nucleophile | |||
Binding site | 278 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 281 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 317 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 319 | L-glutamine (UniProtKB | ChEBI) | |||
Binding site | 320 | L-glutamine (UniProtKB | ChEBI) | |||
Active site | 364 | ||||
Active site | 366 | ||||
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | carbamoyl-phosphate synthase complex | |
Cellular Component | chloroplast | |
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
Encoded on
- Chloroplast
Organism names
- Strain
- Taxonomic lineageEukaryota > Rhodophyta > Florideophyceae > Rhodymeniophycidae > Ceramiales > Rhodomelaceae > Amansieae > Osmundaria
Accessions
- Primary accessionA0A1Z1M4N4
Subcellular Location
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.
Heterodimer composed of 2 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.
Structure
Family & Domains
Features
Showing features for region, domain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Region | 1-176 | CPSase | |||
Domain | 8-138 | Carbamoyl-phosphate synthase small subunit N-terminal | |||
Sequence similarities
Belongs to the CarA family.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusComplete
- Length391
- Mass (Da)43,914
- Last updated2017-09-27 v1
- MD5 Checksum32AD82A6FC37F67010CDA163E365DC78
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
MF101415 EMBL· GenBank· DDBJ | ARW60734.1 EMBL· GenBank· DDBJ | Genomic DNA |