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Database: UniProt
Entry: A0A4U8S5I5_9HELI
LinkDB: A0A4U8S5I5_9HELI
Original site: A0A4U8S5I5_9HELI 
ID   A0A4U8S5I5_9HELI        Unreviewed;       549 AA.
AC   A0A4U8S5I5;
DT   31-JUL-2019, integrated into UniProtKB/TrEMBL.
DT   31-JUL-2019, sequence version 1.
DT   24-JAN-2024, entry version 17.
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   ECO:0000313|EMBL:TLD81065.1};
GN   ORFNames=LS68_006275 {ECO:0000313|EMBL:TLD81065.1};
OS   Helicobacter sp. MIT 05-5293.
OC   Bacteria; Campylobacterota; Epsilonproteobacteria; Campylobacterales;
OC   Helicobacteraceae; Helicobacter.
OX   NCBI_TaxID=1548149 {ECO:0000313|EMBL:TLD81065.1, ECO:0000313|Proteomes:UP000029872};
RN   [1] {ECO:0000313|EMBL:TLD81065.1, ECO:0000313|Proteomes:UP000029872}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=MIT 05-5293 {ECO:0000313|EMBL:TLD81065.1,
RC   ECO:0000313|Proteomes:UP000029872};
RX   PubMed=25428971;
RA   Sheh A., Shen Z., Fox J.G.;
RT   "Draft genome sequences of eight enterohepatic helicobacter species
RT   isolated from both laboratory and wild rodents.";
RL   Genome Announc. 2:e01218-e01214(2014).
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:TLD81065.1}.
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DR   EMBL; JROZ02000002; TLD81065.1; -; Genomic_DNA.
DR   RefSeq; WP_034369967.1; NZ_JROZ02000002.1.
DR   AlphaFoldDB; A0A4U8S5I5; -.
DR   STRING; 1548149.LS68_02590; -.
DR   OrthoDB; 9801107at2; -.
DR   UniPathway; UPA00159; UER00277.
DR   Proteomes; UP000029872; 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: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}.
FT   DOMAIN          6..268
FT                   /note="CTP synthase N-terminal"
FT                   /evidence="ECO:0000259|Pfam:PF06418"
FT   DOMAIN          304..534
FT                   /note="Glutamine amidotransferase"
FT                   /evidence="ECO:0000259|Pfam:PF00117"
FT   REGION          1..268
FT                   /note="Amidoligase domain"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   ACT_SITE        380
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000256|PROSITE-ProRule:PRU00605"
FT   ACT_SITE        380
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         16
FT                   /ligand="CTP"
FT                   /ligand_id="ChEBI:CHEBI:37563"
FT                   /ligand_note="allosteric inhibitor"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         16
FT                   /ligand="UTP"
FT                   /ligand_id="ChEBI:CHEBI:46398"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         17..22
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         74
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         74
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         142
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         149..151
FT                   /ligand="CTP"
FT                   /ligand_id="ChEBI:CHEBI:37563"
FT                   /ligand_note="allosteric inhibitor"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         189..194
FT                   /ligand="CTP"
FT                   /ligand_id="ChEBI:CHEBI:37563"
FT                   /ligand_note="allosteric inhibitor"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         189..194
FT                   /ligand="UTP"
FT                   /ligand_id="ChEBI:CHEBI:46398"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         225
FT                   /ligand="CTP"
FT                   /ligand_id="ChEBI:CHEBI:37563"
FT                   /ligand_note="allosteric inhibitor"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         225
FT                   /ligand="UTP"
FT                   /ligand_id="ChEBI:CHEBI:46398"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         353
FT                   /ligand="L-glutamine"
FT                   /ligand_id="ChEBI:CHEBI:58359"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         381..384
FT                   /ligand="L-glutamine"
FT                   /ligand_id="ChEBI:CHEBI:58359"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         404
FT                   /ligand="L-glutamine"
FT                   /ligand_id="ChEBI:CHEBI:58359"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
FT   BINDING         472
FT                   /ligand="L-glutamine"
FT                   /ligand_id="ChEBI:CHEBI:58359"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_01227"
SQ   SEQUENCE   549 AA;  61834 MW;  EB529107ECC2312D CRC64;
     MANSVKYIFV TGGVLSSLGK GITSSSIATL LQHSGYKVSI LKIDPYINVD PGTMSPLEHG
     EVFVTCDGAE TDLDIGHYER FLNRDLSKIN NFTTGQVYMS VIDKERKGKY LGKTIQIVPH
     IVDEIKHRIK LAGEGNEFLV VELGGTVGDI EGMPYLEAMR QMKHELGNKQ VISIHVTLIP
     LVRAAGELKT KPTQHSVQEL RRIGISPQIL VARCERPLDK ELKRKLAMSC DVDDDSVIVA
     EDTESIYKCP LNFLEEGILS PIARYLNLQE LNPKMDDWDI LVKKIIAPKT SVNIGFVGKY
     LSLKESYKSL IEALIHAGAN IDTRVNIKWI DSENLHQDIT LLEDVDSILI PGGFGERGIQ
     GKLKAIQYAR EHQIPLLGIC LGMQLAMIEF ARNVLGISEA NSVEFDTHTK EPIVYLIEDF
     IDAEGKKQFR THTSPMGGTM RLGEYECQIK KDTKLYQAYG CQTLIKERHR HRYEVNPKYR
     EVFHNNGMII SGESNGLIES IELKDHPWFV GVQFHPEFTS RLQRPNPVIL EFVKQSLAFK
     KADNTFDNS
//
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