ID A0A4D6Y8L7_9GAMM Unreviewed; 376 AA. AC A0A4D6Y8L7; DT 31-JUL-2019, integrated into UniProtKB/TrEMBL. DT 31-JUL-2019, sequence version 1. DT 27-NOV-2024, entry version 20. DE RecName: Full=Carbamoyl phosphate synthase small chain {ECO:0000256|HAMAP-Rule:MF_01209}; DE EC=6.3.5.5 {ECO:0000256|HAMAP-Rule:MF_01209}; DE AltName: Full=Carbamoyl phosphate synthetase glutamine chain {ECO:0000256|HAMAP-Rule:MF_01209}; GN Name=carA {ECO:0000256|HAMAP-Rule:MF_01209}; GN ORFNames=D9V79_00475 {ECO:0000313|EMBL:QCI26286.1}; OS Buchnera aphidicola (Stegophylla sp.). OC Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales; OC Erwiniaceae; Buchnera. OX NCBI_TaxID=2315800 {ECO:0000313|EMBL:QCI26286.1, ECO:0000313|Proteomes:UP000298636}; RN [1] {ECO:0000313|EMBL:QCI26286.1, ECO:0000313|Proteomes:UP000298636} RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=Ssp {ECO:0000313|EMBL:QCI26286.1, RC ECO:0000313|Proteomes:UP000298636}; RA Chong R.A.; RT "Comparative functional genomics of the obligate endosymbiont Buchnera RT aphidicola."; RL Submitted (OCT-2018) to the EMBL/GenBank/DDBJ databases. CC -!- FUNCTION: Small subunit of the glutamine-dependent carbamoyl phosphate CC synthetase (CPSase). CPSase catalyzes the formation of carbamoyl CC phosphate from the ammonia moiety of glutamine, carbonate, and CC phosphate donated by ATP, constituting the first step of 2 biosynthetic CC pathways, one leading to arginine and/or urea and the other to CC pyrimidine nucleotides. The small subunit (glutamine amidotransferase) CC binds and cleaves glutamine to supply the large subunit with the CC substrate ammonia. {ECO:0000256|HAMAP-Rule:MF_01209}. CC -!- CATALYTIC ACTIVITY: CC Reaction=hydrogencarbonate + L-glutamine + 2 ATP + H2O = carbamoyl CC phosphate + L-glutamate + 2 ADP + phosphate + 2 H(+); CC Xref=Rhea:RHEA:18633, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, CC ChEBI:CHEBI:17544, ChEBI:CHEBI:29985, ChEBI:CHEBI:30616, CC ChEBI:CHEBI:43474, ChEBI:CHEBI:58228, ChEBI:CHEBI:58359, CC ChEBI:CHEBI:456216; EC=6.3.5.5; Evidence={ECO:0000256|HAMAP- CC Rule:MF_01209}; CC -!- CATALYTIC ACTIVITY: CC Reaction=L-glutamine + H2O = L-glutamate + NH4(+); CC Xref=Rhea:RHEA:15889, ChEBI:CHEBI:15377, ChEBI:CHEBI:28938, CC ChEBI:CHEBI:29985, ChEBI:CHEBI:58359; Evidence={ECO:0000256|HAMAP- CC Rule:MF_01209}; CC -!- PATHWAY: Amino-acid biosynthesis; L-arginine biosynthesis; carbamoyl CC phosphate from bicarbonate: step 1/1. {ECO:0000256|ARBA:ARBA00005077, CC ECO:0000256|HAMAP-Rule:MF_01209}. CC -!- PATHWAY: Pyrimidine metabolism; UMP biosynthesis via de novo pathway; CC (S)-dihydroorotate from bicarbonate: step 1/3. {ECO:0000256|HAMAP- CC Rule:MF_01209}. CC -!- SUBUNIT: Composed of two chains; the small (or glutamine) chain CC promotes the hydrolysis of glutamine to ammonia, which is used by the CC large (or ammonia) chain to synthesize carbamoyl phosphate. Tetramer of CC heterodimers (alpha,beta)4. {ECO:0000256|HAMAP-Rule:MF_01209}. CC -!- SIMILARITY: Belongs to the CarA family. {ECO:0000256|ARBA:ARBA00007800, CC ECO:0000256|HAMAP-Rule:MF_01209}. CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_01209}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; CP032998; QCI26286.1; -; Genomic_DNA. DR AlphaFoldDB; A0A4D6Y8L7; -. DR OrthoDB; 9804328at2; -. DR UniPathway; UPA00068; UER00171. DR UniPathway; UPA00070; UER00115. DR Proteomes; UP000298636; Chromosome. DR GO; GO:0005951; C:carbamoyl-phosphate synthase complex; IEA:TreeGrafter. DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule. DR GO; GO:0004088; F:carbamoyl-phosphate synthase (glutamine-hydrolyzing) activity; IEA:UniProtKB-UniRule. DR GO; GO:0004359; F:glutaminase activity; IEA:RHEA. DR GO; GO:0006207; P:'de novo' pyrimidine nucleobase biosynthetic process; IEA:InterPro. DR GO; GO:0044205; P:'de novo' UMP biosynthetic process; IEA:UniProtKB-UniPathway. DR GO; GO:0006526; P:arginine biosynthetic process; IEA:UniProtKB-UniRule. DR GO; GO:0006541; P:glutamine metabolic process; IEA:UniProtKB-UniRule. DR CDD; cd01744; GATase1_CPSase; 1. DR FunFam; 3.50.30.20:FF:000001; Carbamoyl-phosphate synthase small chain; 1. DR Gene3D; 3.40.50.880; -; 1. DR Gene3D; 3.50.30.20; Carbamoyl-phosphate synthase small subunit, N-terminal domain; 1. DR HAMAP; MF_01209; CPSase_S_chain; 1. DR InterPro; IPR006274; CarbamoylP_synth_ssu. DR InterPro; IPR002474; CarbamoylP_synth_ssu_N. DR InterPro; IPR036480; CarbP_synth_ssu_N_sf. DR InterPro; IPR029062; Class_I_gatase-like. DR InterPro; IPR035686; CPSase_GATase1. DR InterPro; IPR017926; GATASE. DR NCBIfam; TIGR01368; CPSaseIIsmall; 1. DR PANTHER; PTHR11405:SF4; CARBAMOYL-PHOSPHATE SYNTHASE ARGININE-SPECIFIC SMALL CHAIN; 1. DR PANTHER; PTHR11405; CARBAMOYLTRANSFERASE FAMILY MEMBER; 1. DR Pfam; PF00988; CPSase_sm_chain; 1. DR Pfam; PF00117; GATase; 1. DR PRINTS; PR00099; CPSGATASE. DR PRINTS; PR00096; GATASE. DR SMART; SM01097; CPSase_sm_chain; 1. DR SUPFAM; SSF52021; Carbamoyl phosphate synthetase, small subunit N-terminal domain; 1. DR SUPFAM; SSF52317; Class I glutamine amidotransferase-like; 1. DR PROSITE; PS51273; GATASE_TYPE_1; 1. PE 3: Inferred from homology; KW Amino-acid biosynthesis {ECO:0000256|HAMAP-Rule:MF_01209}; KW Arginine biosynthesis {ECO:0000256|HAMAP-Rule:MF_01209}; KW ATP-binding {ECO:0000256|ARBA:ARBA00022840, ECO:0000256|HAMAP- KW Rule:MF_01209}; KW Glutamine amidotransferase {ECO:0000256|HAMAP-Rule:MF_01209, KW ECO:0000256|PROSITE-ProRule:PRU00605}; KW Ligase {ECO:0000256|ARBA:ARBA00022598, ECO:0000256|HAMAP-Rule:MF_01209}; KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP- KW Rule:MF_01209}; Pyrimidine biosynthesis {ECO:0000256|HAMAP-Rule:MF_01209}; KW Reference proteome {ECO:0000313|Proteomes:UP000298636}. FT DOMAIN 3..133 FT /note="Carbamoyl-phosphate synthase small subunit N- FT terminal" FT /evidence="ECO:0000259|SMART:SM01097" FT REGION 1..187 FT /note="CPSase" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT ACT_SITE 264 FT /note="Nucleophile" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209, FT ECO:0000256|PROSITE-ProRule:PRU00605" FT ACT_SITE 348 FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209, FT ECO:0000256|PROSITE-ProRule:PRU00605" FT ACT_SITE 350 FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209, FT ECO:0000256|PROSITE-ProRule:PRU00605" FT BINDING 47 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 236 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 238 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 265 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 268 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 306 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" FT BINDING 309 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01209" SQ SEQUENCE 376 AA; 43035 MW; 8C4C1BF5503886E7 CRC64; MTQYALLVLE DGTIFQGKSI GYNGITIGEI VFNTSMTGYQ EILTDPSYKN QIITFTYPHI GNTGINKYDT ESNHIQVKGI IIRDISLSNN HCDSIYNLSE YLKYHHIIGI SNLDTRKITR IIRNQGTQYG CIITKYNFSL AYKYTKNFYE HKNMYLVQTS NKKKIYHWTP TKNITIKKTI KNKKKLFHII VYDFGIKNSI LQILSKHGCY FTIVPSDTSY KKILHLQPDG IILSNGPGDP RFYNNAITNI KNIIRINIPT FGICLGHQLL ALSQGAKIIK MKFGHHGSNH PVQNIQTKQV MITTQNHNFT IDHKNIPNNI HITHISLFDK TIQGIQIINK SAFSFQGHPE SSPGPHDAKP LFNTFINYII NTPKLY //