ID A0A954TIS9_9BACT Unreviewed; 550 AA. AC A0A954TIS9; DT 22-FEB-2023, integrated into UniProtKB/TrEMBL. DT 22-FEB-2023, sequence version 1. DT 02-OCT-2024, entry version 6. DE RecName: Full=CTP synthase {ECO:0000256|HAMAP-Rule:MF_01227}; DE EC=6.3.4.2 {ECO:0000256|HAMAP-Rule:MF_01227}; DE AltName: Full=Cytidine 5'-triphosphate synthase {ECO:0000256|HAMAP-Rule:MF_01227}; DE AltName: Full=Cytidine triphosphate synthetase {ECO:0000256|HAMAP-Rule:MF_01227}; DE Short=CTP synthetase {ECO:0000256|HAMAP-Rule:MF_01227}; DE Short=CTPS {ECO:0000256|HAMAP-Rule:MF_01227}; DE AltName: Full=UTP--ammonia ligase {ECO:0000256|HAMAP-Rule:MF_01227}; GN Name=pyrG {ECO:0000256|HAMAP-Rule:MF_01227}; GN ORFNames=KDB22_24475 {ECO:0000313|EMBL:MCA9130275.1}; OS Planctomycetales bacterium. OC Bacteria; Planctomycetota; Planctomycetia; Planctomycetales. OX NCBI_TaxID=2053591 {ECO:0000313|EMBL:MCA9130275.1, ECO:0000313|Proteomes:UP000751317}; RN [1] {ECO:0000313|EMBL:MCA9130275.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=HKST-UBA45 {ECO:0000313|EMBL:MCA9130275.1}; RA Zhang T.; RL Submitted (APR-2020) to the EMBL/GenBank/DDBJ databases. RN [2] {ECO:0000313|EMBL:MCA9130275.1} RP NUCLEOTIDE SEQUENCE. RC STRAIN=HKST-UBA45 {ECO:0000313|EMBL:MCA9130275.1}; RX PubMed=34615557; RA Wang Y., Ye J., Ju F., Liu L., Boyd J.A., Deng Y., Parks D.H., Jiang X., RA Yin X., Woodcroft B.J., Tyson G.W., Hugenholtz P., Polz M.F., Zhang T.; RT "Successional dynamics and alternative stable states in a saline activated RT sludge microbial community over 9 years."; RL Microbiome 9:0-0(2021). 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:0000256|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:0000256|ARBA:ARBA00000314, ECO:0000256|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:0000256|HAMAP- CC 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:0000256|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:0000256|HAMAP- CC Rule:MF_01227}. CC -!- PATHWAY: Pyrimidine metabolism; CTP biosynthesis via de novo pathway; CC CTP from UDP: step 2/2. {ECO:0000256|ARBA:ARBA00005171, CC ECO:0000256|HAMAP-Rule:MF_01227}. CC -!- SUBUNIT: Homotetramer. {ECO:0000256|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:0000256|HAMAP-Rule:MF_01227}. CC -!- SIMILARITY: Belongs to the CTP synthase family. CC {ECO:0000256|ARBA:ARBA00007533, ECO:0000256|HAMAP-Rule:MF_01227}. CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_01227}. CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ CC whole genome shotgun (WGS) entry which is preliminary data. CC {ECO:0000313|EMBL:MCA9130275.1}. 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; JAGQPR010000466; MCA9130275.1; -; Genomic_DNA. DR Proteomes; UP000751317; Unassembled WGS sequence. DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW. DR GO; GO:0003883; F:CTP synthase activity; IEA:UniProtKB-UniRule. DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW. DR GO; GO:0006241; P:CTP biosynthetic process; IEA:InterPro. DR GO; GO:0006541; P:glutamine metabolic process; IEA:UniProtKB-UniRule. 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 {ECO:0000256|ARBA:ARBA00022840, ECO:0000256|HAMAP- KW Rule:MF_01227}; KW Glutamine amidotransferase {ECO:0000256|ARBA:ARBA00022962, KW ECO:0000256|HAMAP-Rule:MF_01227}; KW Ligase {ECO:0000256|ARBA:ARBA00022598, ECO:0000256|HAMAP-Rule:MF_01227}; KW Magnesium {ECO:0000256|HAMAP-Rule:MF_01227}; KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_01227}; KW Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741, ECO:0000256|HAMAP- KW Rule:MF_01227}; KW Pyrimidine biosynthesis {ECO:0000256|ARBA:ARBA00022975, ECO:0000256|HAMAP- KW Rule:MF_01227}. FT DOMAIN 3..267 FT /note="CTP synthase N-terminal" FT /evidence="ECO:0000259|Pfam:PF06418" FT DOMAIN 303..526 FT /note="Glutamine amidotransferase" FT /evidence="ECO:0000259|Pfam:PF00117" FT REGION 1..267 FT /note="Amidoligase domain" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT ACT_SITE 381 FT /note="Nucleophile" FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00605" FT ACT_SITE 381 FT /note="Nucleophile; for glutamine hydrolysis" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT ACT_SITE 507 FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227, FT ECO:0000256|PROSITE-ProRule:PRU00605" FT ACT_SITE 509 FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227, FT ECO:0000256|PROSITE-ProRule:PRU00605" FT BINDING 13 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 13 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 14..19 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 54 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 71 FT /ligand="ATP" FT /ligand_id="ChEBI:CHEBI:30616" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 71 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 140 FT /ligand="Mg(2+)" FT /ligand_id="ChEBI:CHEBI:18420" FT /evidence="ECO:0000256|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:0000256|HAMAP-Rule:MF_01227" FT BINDING 187..192 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 187..192 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 223 FT /ligand="CTP" FT /ligand_id="ChEBI:CHEBI:37563" FT /ligand_note="allosteric inhibitor" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 223 FT /ligand="UTP" FT /ligand_id="ChEBI:CHEBI:46398" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 354 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 382..385 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 405 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" FT BINDING 462 FT /ligand="L-glutamine" FT /ligand_id="ChEBI:CHEBI:58359" FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227" SQ SEQUENCE 550 AA; 61350 MW; 89DE128AFB18BE5A CRC64; MTKHIFVTGG VVSSIGKGLT SASIGMLLEA RGLRVRMQKL DPYINVDPGT MSPYQHGEVY VLDDGSETDL DLGHYERFTE GPLTRNSNYT TGQIYLRVIE KERKGQFLGK TVQVIPHITD EIKSVIRKVG EKDVDVVITE IGGTVGDIES LPFLEAIRQY PLAAGRENCL FIHLTLVPYL KAAGELKTKP TQHSVGQLRQ IGIQPDILIC RCEQSITRDE RDKIALFCNL PPQAVIEERD KDFSIYEVPL SLVSNGLDEQ ICQRLGLSTQ PPNVEPYNDL LHRLRNPKHE ISIAVVGKYA EHKDAYKSIY ESLDHAGIHH HAQIRVGRIQ SADVEDEGAE CLLSGYDGIL VPGGFGERGI EGKLQAVRYA REKDIPFFGI CLGMQCAVIE YGRNVAGLDG ANSTEFDKDT ANPVICLLDE QHEITQMGGT MRLGSQPAVL VDGSKSKLAY GKSSIDERHR HRYEFNNEYR QQFRDAGLEF AGTSPDGKLV EIIELPQHSW FVAVQYHPEF KSKPTRAHPL FAGFVRAAID RRSGRQLKKF APEESNTQTV //