ID   B5XUQ2_KLEP3            Unreviewed;       264 AA.
AC   B5XUQ2;
DT   25-NOV-2008, integrated into UniProtKB/TrEMBL.
DT   25-NOV-2008, sequence version 1.
DT   27-MAR-2024, entry version 90.
DE   RecName: Full=Thymidylate synthase {ECO:0000256|ARBA:ARBA00011947, ECO:0000256|HAMAP-Rule:MF_00008};
DE            Short=TS {ECO:0000256|HAMAP-Rule:MF_00008};
DE            Short=TSase {ECO:0000256|HAMAP-Rule:MF_00008};
DE            EC=2.1.1.45 {ECO:0000256|ARBA:ARBA00011947, ECO:0000256|HAMAP-Rule:MF_00008};
GN   Name=thyA {ECO:0000256|HAMAP-Rule:MF_00008,
GN   ECO:0000313|EMBL:ACI08665.1};
GN   OrderedLocusNames=KPK_0879 {ECO:0000313|EMBL:ACI08665.1};
OS   Klebsiella pneumoniae (strain 342).
OC   Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Klebsiella/Raoultella group; Klebsiella.
OX   NCBI_TaxID=507522 {ECO:0000313|EMBL:ACI08665.1, ECO:0000313|Proteomes:UP000001734};
RN   [1] {ECO:0000313|EMBL:ACI08665.1, ECO:0000313|Proteomes:UP000001734}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=342 {ECO:0000313|EMBL:ACI08665.1,
RC   ECO:0000313|Proteomes:UP000001734};
RX   PubMed=18654632; DOI=10.1371/journal.pgen.1000141;
RA   Fouts D.E., Tyler H.L., DeBoy R.T., Daugherty S., Ren Q., Badger J.H.,
RA   Durkin A.S., Huot H., Shrivastava S., Kothari S., Dodson R.J., Mohamoud Y.,
RA   Khouri H., Roesch L.F., Krogfelt K.A., Struve C., Triplett E.W.,
RA   Methe B.A.;
RT   "Complete genome sequence of the N2-fixing broad host range endophyte
RT   Klebsiella pneumoniae 342 and virulence predictions verified in mice.";
RL   PLoS Genet. 4:E1000141-E1000141(2008).
CC   -!- FUNCTION: Catalyzes the reductive methylation of 2'-deoxyuridine-5'-
CC       monophosphate (dUMP) to 2'-deoxythymidine-5'-monophosphate (dTMP) while
CC       utilizing 5,10-methylenetetrahydrofolate (mTHF) as the methyl donor and
CC       reductant in the reaction, yielding dihydrofolate (DHF) as a by-
CC       product. This enzymatic reaction provides an intracellular de novo
CC       source of dTMP, an essential precursor for DNA biosynthesis.
CC       {ECO:0000256|HAMAP-Rule:MF_00008}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + dUMP = 7,8-
CC         dihydrofolate + dTMP; Xref=Rhea:RHEA:12104, ChEBI:CHEBI:15636,
CC         ChEBI:CHEBI:57451, ChEBI:CHEBI:63528, ChEBI:CHEBI:246422;
CC         EC=2.1.1.45; Evidence={ECO:0000256|HAMAP-Rule:MF_00008};
CC   -!- PATHWAY: Pyrimidine metabolism; dTTP biosynthesis. {ECO:0000256|HAMAP-
CC       Rule:MF_00008}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000256|HAMAP-Rule:MF_00008}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000256|HAMAP-Rule:MF_00008}.
CC   -!- SIMILARITY: Belongs to the thymidylate synthase family. Bacterial-type
CC       ThyA subfamily. {ECO:0000256|HAMAP-Rule:MF_00008}.
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DR   EMBL; CP000964; ACI08665.1; -; Genomic_DNA.
DR   AlphaFoldDB; B5XUQ2; -.
DR   KEGG; kpe:KPK_0879; -.
DR   HOGENOM; CLU_021669_0_0_6; -.
DR   UniPathway; UPA00575; -.
DR   Proteomes; UP000001734; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004799; F:thymidylate synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0006231; P:dTMP biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0006235; P:dTTP biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
DR   CDD; cd00351; TS_Pyrimidine_HMase; 1.
DR   Gene3D; 3.30.572.10; Thymidylate synthase/dCMP hydroxymethylase domain; 1.
DR   HAMAP; MF_00008; Thymidy_synth_bact; 1.
DR   InterPro; IPR045097; Thymidate_synth/dCMP_Mease.
DR   InterPro; IPR023451; Thymidate_synth/dCMP_Mease_dom.
DR   InterPro; IPR036926; Thymidate_synth/dCMP_Mease_sf.
DR   InterPro; IPR000398; Thymidylate_synthase.
DR   InterPro; IPR020940; Thymidylate_synthase_AS.
DR   NCBIfam; TIGR03284; thym_sym; 2.
DR   PANTHER; PTHR11548:SF9; THYMIDYLATE SYNTHASE; 1.
DR   PANTHER; PTHR11548; THYMIDYLATE SYNTHASE 1; 1.
DR   Pfam; PF00303; Thymidylat_synt; 1.
DR   PRINTS; PR00108; THYMDSNTHASE.
DR   SUPFAM; SSF55831; Thymidylate synthase/dCMP hydroxymethylase; 1.
DR   PROSITE; PS00091; THYMIDYLATE_SYNTHASE; 1.
PE   3: Inferred from homology;
KW   Cytoplasm {ECO:0000256|ARBA:ARBA00022490, ECO:0000256|HAMAP-Rule:MF_00008};
KW   Methyltransferase {ECO:0000256|ARBA:ARBA00022603, ECO:0000256|HAMAP-
KW   Rule:MF_00008};
KW   Nucleotide biosynthesis {ECO:0000256|ARBA:ARBA00022727, ECO:0000256|HAMAP-
KW   Rule:MF_00008};
KW   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|HAMAP-
KW   Rule:MF_00008}.
FT   DOMAIN          2..264
FT                   /note="Thymidylate synthase/dCMP hydroxymethylase"
FT                   /evidence="ECO:0000259|Pfam:PF00303"
FT   ACT_SITE        146
FT                   /evidence="ECO:0000256|PROSITE-ProRule:PRU10016"
FT   ACT_SITE        146
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         21
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /note="in other chain"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         51
FT                   /ligand="(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate"
FT                   /ligand_id="ChEBI:CHEBI:15636"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         126..127
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         166..169
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /note="in other chain"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         169
FT                   /ligand="(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate"
FT                   /ligand_id="ChEBI:CHEBI:15636"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         177
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /note="in other chain"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         207..209
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /ligand_note="ligand shared between dimeric partners"
FT                   /note="in other chain"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
FT   BINDING         263
FT                   /ligand="(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate"
FT                   /ligand_id="ChEBI:CHEBI:15636"
FT                   /evidence="ECO:0000256|HAMAP-Rule:MF_00008"
SQ   SEQUENCE   264 AA;  30293 MW;  A405AF51A800ED6E CRC64;
     MKQYLDLMQK VLTEGTPKND RTGTGTISIF GHQMRFNLQE GFPLVTTKRC HLRSIIHELL
     WFLQGDTNIA YLHDNNVTIW DEWADENGDL GPVYGKQWRS WPAPDGRHID QITTVMNQLK
     NDPDSRRIIV SAWNVGELDK MALAPCHAFF QFYVADGKLS CQLYQRSCDV FLGLPFNIAS
     YALLVHMVAQ QCDLQVGDFV WTGGDTHLYS NHLEQTNLQL SREPRPLPKL VIKRKPASIF
     DYRFEDFEIE GYDPHPGIKA PVAI
//