ID C6XC30_METGS Unreviewed; 542 AA.
AC C6XC30;
DT 22-SEP-2009, integrated into UniProtKB/TrEMBL.
DT 22-SEP-2009, sequence version 1.
DT 27-MAR-2024, entry version 90.
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 OrderedLocusNames=Msip34_0857 {ECO:0000313|EMBL:ACT50105.1};
OS Methylovorus glucosotrophus (strain SIP3-4).
OC Bacteria; Pseudomonadota; Betaproteobacteria; Nitrosomonadales;
OC Methylophilaceae; Methylovorus.
OX NCBI_TaxID=582744 {ECO:0000313|EMBL:ACT50105.1, ECO:0000313|Proteomes:UP000002743};
RN [1] {ECO:0000313|Proteomes:UP000002743}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=SIP3-4 {ECO:0000313|Proteomes:UP000002743};
RA Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Tice H., Bruce D.,
RA Goodwin L., Pitluck S., Clum A., Larimer F., Land M., Hauser L.,
RA Kyrpides N., Mikhailova N., Kayluzhnaya M., Chistoserdova L.;
RT "Complete sequence of chromosome of Methylovorus sp. SIP3-4.";
RL Submitted (JUL-2009) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:ACT50105.1, ECO:0000313|Proteomes:UP000002743}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=SIP3-4 {ECO:0000313|EMBL:ACT50105.1,
RC ECO:0000313|Proteomes:UP000002743};
RX PubMed=21622745; DOI=10.1128/JB.00404-11;
RA Lapidus A., Clum A., Labutti K., Kaluzhnaya M.G., Lim S., Beck D.A.,
RA Glavina Del Rio T., Nolan M., Mavromatis K., Huntemann M., Lucas S.,
RA Lidstrom M.E., Ivanova N., Chistoserdova L.;
RT "Genomes of three methylotrophs from a single niche uncover genetic and
RT metabolic divergence of Methylophilaceae.";
RL J. Bacteriol. 193:3757-3764(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: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 ---------------------------------------------------------------------------
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; CP001674; ACT50105.1; -; Genomic_DNA.
DR RefSeq; WP_015829664.1; NC_012969.1.
DR AlphaFoldDB; C6XC30; -.
DR STRING; 582744.Msip34_0857; -.
DR KEGG; mei:Msip34_0857; -.
DR eggNOG; COG0504; Bacteria.
DR HOGENOM; CLU_011675_5_0_4; -.
DR OrthoDB; 9801107at2; -.
DR UniPathway; UPA00159; UER00277.
DR Proteomes; UP000002743; 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-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}; Reference proteome {ECO:0000313|Proteomes:UP000002743}.
FT DOMAIN 3..265
FT /note="CTP synthase N-terminal"
FT /evidence="ECO:0000259|Pfam:PF06418"
FT DOMAIN 301..534
FT /note="Glutamine amidotransferase"
FT /evidence="ECO:0000259|Pfam:PF00117"
FT REGION 1..265
FT /note="Amidoligase domain"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT ACT_SITE 378
FT /note="Nucleophile"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00605"
FT ACT_SITE 378
FT /note="Nucleophile; for glutamine hydrolysis"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT ACT_SITE 515
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227,
FT ECO:0000256|PROSITE-ProRule:PRU00605"
FT ACT_SITE 517
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 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 139
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000256|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:0000256|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:0000256|HAMAP-Rule:MF_01227"
FT BINDING 186..191
FT /ligand="UTP"
FT /ligand_id="ChEBI:CHEBI:46398"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 222
FT /ligand="CTP"
FT /ligand_id="ChEBI:CHEBI:37563"
FT /ligand_note="allosteric inhibitor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 222
FT /ligand="UTP"
FT /ligand_id="ChEBI:CHEBI:46398"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 240
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 351
FT /ligand="L-glutamine"
FT /ligand_id="ChEBI:CHEBI:58359"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 379..382
FT /ligand="L-glutamine"
FT /ligand_id="ChEBI:CHEBI:58359"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 402
FT /ligand="L-glutamine"
FT /ligand_id="ChEBI:CHEBI:58359"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT BINDING 468
FT /ligand="L-glutamine"
FT /ligand_id="ChEBI:CHEBI:58359"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
SQ SEQUENCE 542 AA; 59519 MW; 35C36199DA205DAA CRC64;
MTKYVFVTGG VVSSLGKGIA AASLGAILES RGIKVTMLKL DPYINVDPGT MSPFQHGEVF
VTDDGAETDL DLGHYERFIS ARMAKRNNFT TGQIYETVIK KERRGEYLGK TVQVIPHITD
EIKAHIKRGA EGADVAIVEV GGTVGDIESL PFLEAIRQMG IEEGKSNACY IHLTLLPWIP
TAGELKTKPT QHSVKELREI GIQPDILLCR ADRTIPDDER RKIALFTNVP PEAVISAIDA
SSIYQIPGLL HDQMLDEIVC HKLNILARAA DLSSWNKIVH ALANPRYEVN IAFVGKYVDL
TESYKSLTEA LIHAGIHTES KVKIHYIDSE DIEKNGTGAL KAMDAILVPG GFGKRGTEGK
IAAIRYAREN KVPYLGICLG MQLAVIEFAR DVAGLADANS TEFNPDGPHP LVGLITEWKD
ASGNVEVRSE DSDLGGTMRL GAQKCPIEPG TMAAAIYGSE VNERHRHRYE VNNHYVEQLQ
AAGLVISART PTENLCEMIE LPQDVHPWFV ACQFHPEFTS NPRTGHPLFK AYVQAALARK
NK
//
