ID PYRG_METBU Reviewed; 534 AA. AC Q12WH5; DT 12-DEC-2006, integrated into UniProtKB/Swiss-Prot. DT 22-AUG-2006, sequence version 1. DT 14-DEC-2022, entry version 94. 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}; OrderedLocusNames=Mbur_1282; OS Methanococcoides burtonii (strain DSM 6242 / NBRC 107633 / OCM 468 / OS ACE-M). OC Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia; OC Methanosarcinales; Methanosarcinaceae; Methanococcoides. OX NCBI_TaxID=259564; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=DSM 6242 / NBRC 107633 / OCM 468 / ACE-M; RX PubMed=19404327; DOI=10.1038/ismej.2009.45; RA Allen M.A., Lauro F.M., Williams T.J., Burg D., Siddiqui K.S., RA De Francisci D., Chong K.W., Pilak O., Chew H.H., De Maere M.Z., Ting L., RA Katrib M., Ng C., Sowers K.R., Galperin M.Y., Anderson I.J., Ivanova N., RA Dalin E., Martinez M., Lapidus A., Hauser L., Land M., Thomas T., RA Cavicchioli R.; RT "The genome sequence of the psychrophilic archaeon, Methanococcoides RT burtonii: the role of genome evolution in cold adaptation."; RL ISME J. 3:1012-1035(2009). 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; CP000300; ABE52201.1; -; Genomic_DNA. DR RefSeq; WP_011499346.1; NC_007955.1. DR AlphaFoldDB; Q12WH5; -. DR SMR; Q12WH5; -. DR STRING; 259564.Mbur_1282; -. DR MEROPS; C26.964; -. DR EnsemblBacteria; ABE52201; ABE52201; Mbur_1282. DR GeneID; 3998306; -. DR KEGG; mbu:Mbur_1282; -. DR HOGENOM; CLU_011675_5_0_2; -. DR OMA; EFNNAYR; -. DR OrthoDB; 14061at2157; -. DR UniPathway; UPA00159; UER00277. DR Proteomes; UP000001979; Chromosome. 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; 3.40.50.300; -; 1. DR Gene3D; 3.40.50.880; -; 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 PANTHER; PTHR11550; CTP SYNTHASE; 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 TIGRFAMs; TIGR00337; PyrG; 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; Reference proteome. FT CHAIN 1..534 FT /note="CTP synthase" FT /id="PRO_0000266273" FT DOMAIN 289..530 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 379 FT /note="Nucleophile; for glutamine hydrolysis" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT ACT_SITE 503 FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT ACT_SITE 505 FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 12 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 12 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 13..18 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 53 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 70 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 70 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 140 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 147..149 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 352 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 380..383 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 403 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" FT BINDING 460 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227" SQ SEQUENCE 534 AA; 59573 MW; A08872A8BBD4BDE9 CRC64; MKYIIVTGGV MSGLGKGITT ASVGRNLKNK GYKVTAIKID PYINIDAGTM SPYQHGEVYV LKDGGEVDLD LGNYERFLDT ELTRDHNLTT GKIYQTVIDK ERKGEYLGKT VQIIPHITNE IKDRIRRIAA KSGADVCLIE VGGTVGDIES MPFLEAVRQM YREESPENIA LLHVTLVPID SQGDQKTKPT QHSVKELREL GLTPHVIVSR CKKALMESTR SKIALFCDVP VEAVISAHDS ADIYEVPLQL ENEGLSNYLL KKLILKSTLE DTNWEEMVIR MNNCTGNVNV AIVGKYTHLE DSYISIVESL KHGAIEIGCK FEITWFDAES FDDDPSEVEK LNGFDGILVP GGFGERGTEG KMLAIKYARE NNIPYLGLCL GMQLAVIEFA RNVVGLDGAN SSEFDENTPY PVIDLLPEQE DVVDMGATMR LGDYEATLKA GSLAESIYGA SLITERHRHR YEVNPNYVDR IEEHGMIFSG KNKNRMEIAE VPSKDFYFAS QFHPEFKSRP GRPSPPFKAF MGAMLKKSKE KKDQ //