PYRG_CHLPN
ID PYRG_CHLPN Reviewed; 537 AA.
AC Q9Z8U8; Q9JRV7;
DT 27-APR-2001, integrated into UniProtKB/Swiss-Prot.
DT 27-APR-2001, sequence version 2.
DT 03-AUG-2022, entry version 145.
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=CPn_0236, CP_0526, CpB0242;
OS Chlamydia pneumoniae (Chlamydophila pneumoniae).
OC Bacteria; Chlamydiae; Chlamydiales; Chlamydiaceae;
OC Chlamydia/Chlamydophila group; Chlamydia.
OX NCBI_TaxID=83558;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=CWL029;
RX PubMed=10192388; DOI=10.1038/7716;
RA Kalman S., Mitchell W.P., Marathe R., Lammel C.J., Fan J., Hyman R.W.,
RA Olinger L., Grimwood J., Davis R.W., Stephens R.S.;
RT "Comparative genomes of Chlamydia pneumoniae and C. trachomatis.";
RL Nat. Genet. 21:385-389(1999).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=AR39;
RX PubMed=10684935; DOI=10.1093/nar/28.6.1397;
RA Read T.D., Brunham R.C., Shen C., Gill S.R., Heidelberg J.F., White O.,
RA Hickey E.K., Peterson J.D., Utterback T.R., Berry K.J., Bass S.,
RA Linher K.D., Weidman J.F., Khouri H.M., Craven B., Bowman C., Dodson R.J.,
RA Gwinn M.L., Nelson W.C., DeBoy R.T., Kolonay J.F., McClarty G.,
RA Salzberg S.L., Eisen J.A., Fraser C.M.;
RT "Genome sequences of Chlamydia trachomatis MoPn and Chlamydia pneumoniae
RT AR39.";
RL Nucleic Acids Res. 28:1397-1406(2000).
RN [3]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=J138;
RX PubMed=10871362; DOI=10.1093/nar/28.12.2311;
RA Shirai M., Hirakawa H., Kimoto M., Tabuchi M., Kishi F., Ouchi K.,
RA Shiba T., Ishii K., Hattori M., Kuhara S., Nakazawa T.;
RT "Comparison of whole genome sequences of Chlamydia pneumoniae J138 from
RT Japan and CWL029 from USA.";
RL Nucleic Acids Res. 28:2311-2314(2000).
RN [4]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=TW-183;
RA Geng M.M., Schuhmacher A., Muehldorfer I., Bensch K.W., Schaefer K.P.,
RA Schneider S., Pohl T., Essig A., Marre R., Melchers K.;
RT "The genome sequence of Chlamydia pneumoniae TW183 and comparison with
RT other Chlamydia strains based on whole genome sequence analysis.";
RL Submitted (MAY-2002) to the EMBL/GenBank/DDBJ databases.
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}.
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DR EMBL; AE001363; AAD18389.1; -; Genomic_DNA.
DR EMBL; AE002161; AAF38350.1; -; Genomic_DNA.
DR EMBL; BA000008; BAA98446.1; -; Genomic_DNA.
DR EMBL; AE009440; AAP98175.1; -; Genomic_DNA.
DR PIR; A72103; A72103.
DR PIR; D86520; D86520.
DR PIR; E81568; E81568.
DR RefSeq; NP_224445.1; NC_000922.1.
DR RefSeq; WP_010892089.1; NZ_LN846995.1.
DR AlphaFoldDB; Q9Z8U8; -.
DR SMR; Q9Z8U8; -.
DR STRING; 115711.CP_0526; -.
DR MEROPS; C26.964; -.
DR EnsemblBacteria; AAD18389; AAD18389; CPn_0236.
DR EnsemblBacteria; AAF38350; AAF38350; CP_0526.
DR KEGG; cpa:CP_0526; -.
DR KEGG; cpj:pyrG; -.
DR KEGG; cpn:CPn_0236; -.
DR KEGG; cpt:CpB0242; -.
DR PATRIC; fig|115713.3.peg.266; -.
DR eggNOG; COG0504; Bacteria.
DR HOGENOM; CLU_011675_5_0_0; -.
DR UniPathway; UPA00159; UER00277.
DR Proteomes; UP000000583; Chromosome.
DR Proteomes; UP000000801; 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; PTHR11550; 1.
DR Pfam; PF06418; CTP_synth_N; 1.
DR Pfam; PF00117; GATase; 1.
DR SUPFAM; SSF52317; SSF52317; 1.
DR SUPFAM; SSF52540; SSF52540; 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.
FT CHAIN 1..537
FT /note="CTP synthase"
FT /id="PRO_0000138176"
FT DOMAIN 293..533
FT /note="Glutamine amidotransferase type-1"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT REGION 1..268
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 506
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT ACT_SITE 508
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 14
FT /ligand="CTP"
FT /ligand_id="ChEBI:CHEBI:37563"
FT /ligand_note="allosteric inhibitor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 14
FT /ligand="UTP"
FT /ligand_id="ChEBI:CHEBI:46398"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 15..20
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 72
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 72
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 142
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000255|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:0000255|HAMAP-Rule:MF_01227"
FT BINDING 188..193
FT /ligand="CTP"
FT /ligand_id="ChEBI:CHEBI:37563"
FT /ligand_note="allosteric inhibitor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 188..193
FT /ligand="UTP"
FT /ligand_id="ChEBI:CHEBI:46398"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 224
FT /ligand="CTP"
FT /ligand_id="ChEBI:CHEBI:37563"
FT /ligand_note="allosteric inhibitor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT BINDING 224
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 461
FT /ligand="L-glutamine"
FT /ligand_id="ChEBI:CHEBI:58359"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01227"
FT VARIANT 279
FT /note="R -> K (in strain: CWL029 and TW-183)"
SQ SEQUENCE 537 AA; 59645 MW; CED3A0D2C428B992 CRC64;
MPFKCIFLTG GVVSSLGKGL TAASLALILE RQRLNVAMLK LDPYLNVDPG TMNPFEHGEI
YVTDDGVETD LDLGHYHRFS SAALSRHSSA TSGQIYARVI KREREGDYLG STVQVIPHIT
NEIIQVILDA AKEHSPDVLI VEIGGTIGDI ESLPFLEAIR QFRYDHSEDC LNIHMTYVPY
LQAADEVKSK PTQHSVQTLR GIGIIPDAIL CRSEKPLTQE VKSKISLFCN VPNRAVFNVI
DVKHTIYEMP LMLAQEKIAN FIGEKLKLAT VPENLDDWRV LVNQLSQDLP KVKIGVVGKY
VQHRDAYKSI FEALTHAALR LGHAAEIIPI DAEDENLTME LSQCDACLVP GGFGVRGWEG
KIAAAKFCRE QGIPYFGICL GMQVLVVEYA RNVLNLDQAN SLEMDPNTPH PIVYVMEGQD
PLVATGGTMR LGAYPCLLKP GSKAHKAYNE SSLIQERHRH RYEVNPDYIQ SLEDHGLRIV
GTCPPQGLCE IIEVSDHPWM IGVQFHPEFV SKLISPHPLF IAFIEAALVY SKDASHV
