ID   B2FPG0_STRMK            Unreviewed;       264 AA.
AC   B2FPG0;
DT   10-JUN-2008, integrated into UniProtKB/TrEMBL.
DT   10-JUN-2008, sequence version 1.
DT   04-NOV-2026, entry version 100.
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:CAQ44389.1};
GN   OrderedLocusNames=Smlt0813 {ECO:0000313|EMBL:CAQ44389.1};
OS   Stenotrophomonas maltophilia (strain K279a).
OC   Bacteria; Pseudomonadati; Pseudomonadota; Gammaproteobacteria;
OC   Lysobacterales; Lysobacteraceae; Stenotrophomonas;
OC   Stenotrophomonas maltophilia group.
OX   NCBI_TaxID=522373 {ECO:0000313|EMBL:CAQ44389.1, ECO:0000313|Proteomes:UP000008840};
RN   [1] {ECO:0000313|EMBL:CAQ44389.1, ECO:0000313|Proteomes:UP000008840}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=K279a {ECO:0000313|EMBL:CAQ44389.1,
RC   ECO:0000313|Proteomes:UP000008840};
RX   PubMed=18419807; DOI=10.1186/gb-2008-9-4-r74;
RA   Crossman L.C., Gould V.C., Dow J.M., Vernikos G.S., Okazaki A.,
RA   Sebaihia M., Saunders D., Arrowsmith C., Carver T., Peters N., Adlem E.,
RA   Kerhornou A., Lord A., Murphy L., Seeger K., Squares R., Rutter S.,
RA   Quail M.A., Rajandream M.A., Harris D., Churcher C., Bentley S.D.,
RA   Parkhill J., Thomson N.R., Avison M.B.;
RT   "The complete genome, comparative and functional analysis of
RT   Stenotrophomonas maltophilia reveals an organism heavily shielded by drug
RT   resistance determinants.";
RL   Genome Biol. 9:R74.1-R74.13(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=dUMP + (6R)-5,10-methylene-5,6,7,8-tetrahydrofolate = 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|ARBA:ARBA00047344,
CC         ECO:0000256|HAMAP-Rule:MF_00008};
CC   -!- PATHWAY: Pyrimidine metabolism; dTTP biosynthesis. {ECO:0000256|HAMAP-
CC       Rule:MF_00008}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000256|ARBA:ARBA00011738, ECO:0000256|HAMAP-
CC       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; AM743169; CAQ44389.1; -; Genomic_DNA.
DR   RefSeq; WP_012479193.1; NC_010943.1.
DR   AlphaFoldDB; B2FPG0; -.
DR   EnsemblBacteria; CAQ44389; CAQ44389; Smlt0813.
DR   GeneID; 90526432; -.
DR   KEGG; sml:Smlt0813; -.
DR   PATRIC; fig|522373.3.peg.782; -.
DR   eggNOG; COG0207; Bacteria.
DR   HOGENOM; CLU_021669_0_0_6; -.
DR   OMA; AAHQWVT; -.
DR   UniPathway; UPA00575; -.
DR   Proteomes; UP000008840; Chromosome.
DR   GO; GO:0005829; C:cytosol; IEA:TreeGrafter.
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-UniRule.
DR   CDD; cd00351; TS_Pyrimidine_HMase; 1.
DR   FunFam; 3.30.572.10:FF:000001; Thymidylate synthase; 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; NF002497; PRK01827.1-3; 1.
DR   NCBIfam; NF002499; thyA; 1.
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}; Reference proteome {ECO:0000313|Proteomes:UP000008840};
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;  30130 MW;  56E239E42712083A CRC64;
     MKAYLDLLSH VLEHGAEKSD RTGTGTRSVF GWQMRFNLAD GFPLVTTKKL HLRSIIHELL
     WFLKGDTNIG YLKDNQVRIW DEWADENGDL GPVYGKQWRS WATADGREID QMQWLVDEIK
     RNPDSRRLVV SAWNVGELSQ MALMPCHNLF QFYVVDGKLS CQLYQRSGDI FLGVPFNIAS
     YALLTHMVAQ ATGLGVGDFV HTLGDAHLYS NHFEQAREQL SREPRALPKL WLNPEVTDLF
     GFQFDDIRID GYDPHPAIKA PVAV
//