ID   TYSY_HAEIE              Reviewed;         283 AA.
AC   A5UDH0;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   10-JUL-2007, sequence version 1.
DT   03-AUG-2022, entry version 76.
DE   RecName: Full=Thymidylate synthase {ECO:0000255|HAMAP-Rule:MF_00008};
DE            Short=TS {ECO:0000255|HAMAP-Rule:MF_00008};
DE            Short=TSase {ECO:0000255|HAMAP-Rule:MF_00008};
DE            EC=2.1.1.45 {ECO:0000255|HAMAP-Rule:MF_00008};
GN   Name=thyA {ECO:0000255|HAMAP-Rule:MF_00008};
GN   OrderedLocusNames=CGSHiEE_07490;
OS   Haemophilus influenzae (strain PittEE).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC   Pasteurellaceae; Haemophilus.
OX   NCBI_TaxID=374930;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PittEE;
RX   PubMed=17550610; DOI=10.1186/gb-2007-8-6-r103;
RA   Hogg J.S., Hu F.Z., Janto B., Boissy R., Hayes J., Keefe R., Post J.C.,
RA   Ehrlich G.D.;
RT   "Characterization and modeling of the Haemophilus influenzae core and
RT   supragenomes based on the complete genomic sequences of Rd and 12 clinical
RT   nontypeable strains.";
RL   Genome Biol. 8:R103.1-R103.18(2007).
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:0000255|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:0000255|HAMAP-Rule:MF_00008};
CC   -!- PATHWAY: Pyrimidine metabolism; dTTP biosynthesis. {ECO:0000255|HAMAP-
CC       Rule:MF_00008}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00008}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00008}.
CC   -!- SIMILARITY: Belongs to the thymidylate synthase family. Bacterial-type
CC       ThyA subfamily. {ECO:0000255|HAMAP-Rule:MF_00008}.
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DR   EMBL; CP000671; ABQ98821.1; -; Genomic_DNA.
DR   RefSeq; WP_005666042.1; NC_009566.1.
DR   AlphaFoldDB; A5UDH0; -.
DR   SMR; A5UDH0; -.
DR   KEGG; hip:CGSHiEE_07490; -.
DR   HOGENOM; CLU_021669_0_1_6; -.
DR   OMA; KQYLDLC; -.
DR   UniPathway; UPA00575; -.
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; -; 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   PANTHER; PTHR11548; PTHR11548; 1.
DR   Pfam; PF00303; Thymidylat_synt; 1.
DR   PRINTS; PR00108; THYMDSNTHASE.
DR   SUPFAM; SSF55831; SSF55831; 1.
DR   TIGRFAMs; TIGR03284; thym_sym; 1.
DR   PROSITE; PS00091; THYMIDYLATE_SYNTHASE; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Methyltransferase; Nucleotide biosynthesis; Transferase.
FT   CHAIN           1..283
FT                   /note="Thymidylate synthase"
FT                   /id="PRO_1000000605"
FT   ACT_SITE        160
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         22
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         180..183
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         183
FT                   /ligand="(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate"
FT                   /ligand_id="ChEBI:CHEBI:15636"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         191
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         221..223
FT                   /ligand="dUMP"
FT                   /ligand_id="ChEBI:CHEBI:246422"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
FT   BINDING         282
FT                   /ligand="(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate"
FT                   /ligand_id="ChEBI:CHEBI:15636"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00008"
SQ   SEQUENCE   283 AA;  32479 MW;  C1B34C5651B8D033 CRC64;
     MKQYLELCRR IVSEGEWVAN ERTGKRCLTV INADLEYDVA NNQFPLITTR KSYWKAAIAE
     FLGYIRGYDN AADFRALGTK TWDANANENA AWLANPHRRG VDDMGRVYGV QGRAWRKPNG
     ETIDQLRKIV NNLTKGIDDR GEILTFFNPG EFDLGCLRPC MHTHTFSLVG DTLHLTSYQR
     SCDVPLGLNF NQIQVFTFLA LMAQITGKKA GKAYHKIVNA HIYEDQLELM RDVQLKREPF
     PLPKLEINPD IKTLEDLETW VTMDDFKVVG YQSHEPIKYP FSV