ID PYRG_BRUSU Reviewed; 542 AA. AC Q8G0G1; G0KA56; DT 31-OCT-2003, integrated into UniProtKB/Swiss-Prot. DT 01-MAR-2003, sequence version 1. DT 27-MAR-2024, entry version 115. DE RecName: Full=CTP synthase {ECO:0000255|HAMAP-Rule:MF_01227}; DE EC=6.3.4.2 {ECO:0000255|HAMAP-Rule:MF_01227}; DE AltName: Full=Cytidine 5'-triphosphate synthase {ECO:0000255|HAMAP-Rule:MF_01227}; DE AltName: Full=Cytidine triphosphate synthetase {ECO:0000255|HAMAP-Rule:MF_01227}; DE Short=CTP synthetase {ECO:0000255|HAMAP-Rule:MF_01227}; DE Short=CTPS {ECO:0000255|HAMAP-Rule:MF_01227}; DE AltName: Full=UTP--ammonia ligase {ECO:0000255|HAMAP-Rule:MF_01227}; GN Name=pyrG {ECO:0000255|HAMAP-Rule:MF_01227}; GN OrderedLocusNames=BR1134, BS1330_I1130; OS Brucella suis biovar 1 (strain 1330). OC Bacteria; Pseudomonadota; Alphaproteobacteria; Hyphomicrobiales; OC Brucellaceae; Brucella/Ochrobactrum group; Brucella. OX NCBI_TaxID=204722; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=1330; RX PubMed=12271122; DOI=10.1073/pnas.192319099; RA Paulsen I.T., Seshadri R., Nelson K.E., Eisen J.A., Heidelberg J.F., RA Read T.D., Dodson R.J., Umayam L.A., Brinkac L.M., Beanan M.J., RA Daugherty S.C., DeBoy R.T., Durkin A.S., Kolonay J.F., Madupu R., RA Nelson W.C., Ayodeji B., Kraul M., Shetty J., Malek J.A., Van Aken S.E., RA Riedmuller S., Tettelin H., Gill S.R., White O., Salzberg S.L., RA Hoover D.L., Lindler L.E., Halling S.M., Boyle S.M., Fraser C.M.; RT "The Brucella suis genome reveals fundamental similarities between animal RT and plant pathogens and symbionts."; RL Proc. Natl. Acad. Sci. U.S.A. 99:13148-13153(2002). RN [2] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=1330; RX PubMed=22038969; DOI=10.1128/jb.06181-11; RA Tae H., Shallom S., Settlage R., Preston D., Adams L.G., Garner H.R.; RT "Revised genome sequence of Brucella suis 1330."; RL J. Bacteriol. 193:6410-6410(2011). CC -!- FUNCTION: Catalyzes the ATP-dependent amination of UTP to CTP with CC either L-glutamine or ammonia as the source of nitrogen. Regulates CC intracellular CTP levels through interactions with the four CC ribonucleotide triphosphates. {ECO:0000255|HAMAP-Rule:MF_01227}. CC -!- CATALYTIC ACTIVITY: CC Reaction=ATP + H2O + L-glutamine + UTP = ADP + CTP + 2 H(+) + L- CC glutamate + phosphate; Xref=Rhea:RHEA:26426, ChEBI:CHEBI:15377, CC ChEBI:CHEBI:15378, ChEBI:CHEBI:29985, ChEBI:CHEBI:30616, CC ChEBI:CHEBI:37563, ChEBI:CHEBI:43474, ChEBI:CHEBI:46398, CC ChEBI:CHEBI:58359, ChEBI:CHEBI:456216; EC=6.3.4.2; CC Evidence={ECO:0000255|HAMAP-Rule:MF_01227}; CC -!- CATALYTIC ACTIVITY: CC Reaction=H2O + L-glutamine = L-glutamate + NH4(+); CC Xref=Rhea:RHEA:15889, ChEBI:CHEBI:15377, ChEBI:CHEBI:28938, CC ChEBI:CHEBI:29985, ChEBI:CHEBI:58359; Evidence={ECO:0000255|HAMAP- CC Rule:MF_01227}; CC -!- CATALYTIC ACTIVITY: CC Reaction=ATP + NH4(+) + UTP = ADP + CTP + 2 H(+) + phosphate; CC Xref=Rhea:RHEA:16597, ChEBI:CHEBI:15378, ChEBI:CHEBI:28938, CC ChEBI:CHEBI:30616, ChEBI:CHEBI:37563, ChEBI:CHEBI:43474, CC ChEBI:CHEBI:46398, ChEBI:CHEBI:456216; Evidence={ECO:0000255|HAMAP- CC Rule:MF_01227}; CC -!- ACTIVITY REGULATION: Allosterically activated by GTP, when glutamine is CC the substrate; GTP has no effect on the reaction when ammonia is the CC substrate. The allosteric effector GTP functions by stabilizing the CC protein conformation that binds the tetrahedral intermediate(s) formed CC during glutamine hydrolysis. Inhibited by the product CTP, via CC allosteric rather than competitive inhibition. {ECO:0000255|HAMAP- CC Rule:MF_01227}. CC -!- PATHWAY: Pyrimidine metabolism; CTP biosynthesis via de novo pathway; CC CTP from UDP: step 2/2. {ECO:0000255|HAMAP-Rule:MF_01227}. CC -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_01227}. CC -!- MISCELLANEOUS: CTPSs have evolved a hybrid strategy for distinguishing CC between UTP and CTP. The overlapping regions of the product feedback CC inhibitory and substrate sites recognize a common feature in both CC compounds, the triphosphate moiety. To differentiate isosteric CC substrate and product pyrimidine rings, an additional pocket far from CC the expected kinase/ligase catalytic site, specifically recognizes the CC cytosine and ribose portions of the product inhibitor. CC {ECO:0000255|HAMAP-Rule:MF_01227}. CC -!- SIMILARITY: Belongs to the CTP synthase family. {ECO:0000255|HAMAP- CC Rule:MF_01227}. 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; AE014291; AAN30054.1; -; Genomic_DNA. DR EMBL; CP002997; AEM18472.1; -; Genomic_DNA. DR RefSeq; WP_004690886.1; NZ_KN046804.1. DR AlphaFoldDB; Q8G0G1; -. DR SMR; Q8G0G1; -. DR MEROPS; C26.964; -. DR GeneID; 55590818; -. DR KEGG; bms:BR1134; -. DR KEGG; bsi:BS1330_I1130; -. DR PATRIC; fig|204722.21.peg.1987; -. DR HOGENOM; CLU_011675_5_0_5; -. DR PhylomeDB; Q8G0G1; -. DR UniPathway; UPA00159; UER00277. DR Proteomes; UP000007104; Chromosome I. DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW. DR GO; GO:0003883; F:CTP synthase activity; IEA:UniProtKB-UniRule. DR GO; GO:0004359; F:glutaminase activity; IEA:RHEA. DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW. DR GO; GO:0044210; P:'de novo' CTP biosynthetic process; IEA:UniProtKB-UniPathway. DR GO; GO:0006541; P:glutamine metabolic process; IEA:UniProtKB-KW. DR CDD; cd03113; CTPS_N; 1. DR CDD; cd01746; GATase1_CTP_Synthase; 1. DR Gene3D; 3.40.50.880; -; 1. DR Gene3D; 3.40.50.300; P-loop containing nucleotide triphosphate hydrolases; 1. DR HAMAP; MF_01227; PyrG; 1. DR InterPro; IPR029062; Class_I_gatase-like. DR InterPro; IPR004468; CTP_synthase. DR InterPro; IPR017456; CTP_synthase_N. DR InterPro; IPR017926; GATASE. DR InterPro; IPR033828; GATase1_CTP_Synthase. DR InterPro; IPR027417; P-loop_NTPase. DR NCBIfam; TIGR00337; PyrG; 1. DR PANTHER; PTHR11550; CTP SYNTHASE; 1. DR PANTHER; PTHR11550:SF0; CTP SYNTHASE-RELATED; 1. DR Pfam; PF06418; CTP_synth_N; 1. DR Pfam; PF00117; GATase; 1. DR SUPFAM; SSF52317; Class I glutamine amidotransferase-like; 1. DR SUPFAM; SSF52540; P-loop containing nucleoside triphosphate hydrolases; 1. DR PROSITE; PS51273; GATASE_TYPE_1; 1. PE 3: Inferred from homology; KW ATP-binding; Glutamine amidotransferase; Ligase; Magnesium; Metal-binding; KW Nucleotide-binding; Pyrimidine biosynthesis. FT CHAIN 1..542 FT /note="CTP synthase" FT /id="PRO_0000138168" FT DOMAIN 291..541 FT /note="Glutamine amidotransferase type-1" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT REGION 1..265 FT /note="Amidoligase domain" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT ACT_SITE 380 FT /note="Nucleophile; for glutamine hydrolysis" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT ACT_SITE 514 FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT ACT_SITE 516 FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 13 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 13 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 14..19 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 54 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 71 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 71 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 139 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 146..148 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 186..191 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 186..191 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 222 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 222 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 353 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 381..384 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 404 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 469 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" SQ SEQUENCE 542 AA; 60058 MW; B88F10406370B7B0 CRC64; MARYVFITGG VVSSLGKGIA AAALAALLQA RGYRVRIRKL DPYLNVDPGT ISPYQHGEVF VTDDGAETDL DLGHYERFTG RPANQQDNIT TGRIYRNIIE KERRGDYLGA TVQVIPHVTD EIKNFVLEGN EDYDFVLCEI GGTVGDIEAM PFLEAIRQLG NELPRGTAVY IHLTLMPYIP AAGELKTKPT QHSVKELRSI GIAPDILLVR ADREIPESER RKLSLFCNVR ESAVIQALDV ATIYDVPIAY HKEGLDSEVL SAFGIDPAPK PRMDRWEEVS HRLHNPEGEV TIAVVGKYTG LKDAYKSLIE ALHHGGLANK VKVNLDWIEA QVFESEDPAP YLEKVHGILV PGGFGERGAE GKILAAKFAR ERKVPYFGIC FGMQMACIEA ARNLVGIEDA SSSEFGPTRE PVVGLMTEWL KGNMLEKRAA AGDLGGTMRL GAYEAVLKPD SKIAQIYGST DIHERHRHRY EVNIDYKDRL EAAGLNFAGM SPDGVLPETV EYADHPWFIG VQYHPELKSR PFEPHPLFAS FIEAAIEQSR LV //