ID   KHSE_STRA3              Reviewed;         288 AA.
AC   Q8E546;
DT   15-FEB-2005, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2003, sequence version 1.
DT   03-AUG-2022, entry version 105.
DE   RecName: Full=Homoserine kinase {ECO:0000255|HAMAP-Rule:MF_00384};
DE            Short=HK {ECO:0000255|HAMAP-Rule:MF_00384};
DE            Short=HSK {ECO:0000255|HAMAP-Rule:MF_00384};
DE            EC=2.7.1.39 {ECO:0000255|HAMAP-Rule:MF_00384};
GN   Name=thrB {ECO:0000255|HAMAP-Rule:MF_00384}; OrderedLocusNames=gbs1186;
OS   Streptococcus agalactiae serotype III (strain NEM316).
OC   Bacteria; Firmicutes; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=211110;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=NEM316;
RX   PubMed=12354221; DOI=10.1046/j.1365-2958.2002.03126.x;
RA   Glaser P., Rusniok C., Buchrieser C., Chevalier F., Frangeul L., Msadek T.,
RA   Zouine M., Couve E., Lalioui L., Poyart C., Trieu-Cuot P., Kunst F.;
RT   "Genome sequence of Streptococcus agalactiae, a pathogen causing invasive
RT   neonatal disease.";
RL   Mol. Microbiol. 45:1499-1513(2002).
CC   -!- FUNCTION: Catalyzes the ATP-dependent phosphorylation of L-homoserine
CC       to L-homoserine phosphate. {ECO:0000255|HAMAP-Rule:MF_00384}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + L-homoserine = ADP + H(+) + O-phospho-L-homoserine;
CC         Xref=Rhea:RHEA:13985, ChEBI:CHEBI:15378, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:57476, ChEBI:CHEBI:57590, ChEBI:CHEBI:456216;
CC         EC=2.7.1.39; Evidence={ECO:0000255|HAMAP-Rule:MF_00384};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-threonine biosynthesis; L-threonine
CC       from L-aspartate: step 4/5. {ECO:0000255|HAMAP-Rule:MF_00384}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00384}.
CC   -!- SIMILARITY: Belongs to the GHMP kinase family. Homoserine kinase
CC       subfamily. {ECO:0000255|HAMAP-Rule:MF_00384}.
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DR   EMBL; AL766849; CAD46845.1; -; Genomic_DNA.
DR   RefSeq; WP_001220331.1; NC_004368.1.
DR   AlphaFoldDB; Q8E546; -.
DR   SMR; Q8E546; -.
DR   STRING; 211110.gbs1186; -.
DR   EnsemblBacteria; CAD46845; CAD46845; CAD46845.
DR   GeneID; 66886044; -.
DR   KEGG; san:gbs1186; -.
DR   eggNOG; COG0083; Bacteria.
DR   HOGENOM; CLU_041243_0_0_9; -.
DR   OMA; CANRIPH; -.
DR   UniPathway; UPA00050; UER00064.
DR   Proteomes; UP000000823; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004413; F:homoserine kinase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0016310; P:phosphorylation; IEA:UniProtKB-KW.
DR   GO; GO:0009088; P:threonine biosynthetic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.30.230.10; -; 1.
DR   Gene3D; 3.30.70.890; -; 1.
DR   HAMAP; MF_00384; Homoser_kinase; 1.
DR   InterPro; IPR013750; GHMP_kinase_C_dom.
DR   InterPro; IPR036554; GHMP_kinase_C_sf.
DR   InterPro; IPR006204; GHMP_kinase_N_dom.
DR   InterPro; IPR006203; GHMP_knse_ATP-bd_CS.
DR   InterPro; IPR000870; Homoserine_kinase.
DR   InterPro; IPR020568; Ribosomal_S5_D2-typ_fold.
DR   InterPro; IPR014721; Ribosomal_S5_D2-typ_fold_subgr.
DR   Pfam; PF08544; GHMP_kinases_C; 1.
DR   Pfam; PF00288; GHMP_kinases_N; 1.
DR   PIRSF; PIRSF000676; Homoser_kin; 1.
DR   SUPFAM; SSF54211; SSF54211; 1.
DR   SUPFAM; SSF55060; SSF55060; 1.
DR   TIGRFAMs; TIGR00191; thrB; 1.
DR   PROSITE; PS00627; GHMP_KINASES_ATP; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; ATP-binding; Cytoplasm; Kinase;
KW   Nucleotide-binding; Threonine biosynthesis; Transferase.
FT   CHAIN           1..288
FT                   /note="Homoserine kinase"
FT                   /id="PRO_0000156614"
FT   BINDING         78..88
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00384"
SQ   SEQUENCE   288 AA;  31474 MW;  06C579F81F63015D CRC64;
     MRIIVPATSA NIGPGFDSIG VALSKYLSIE VLEESTEWLV EHNLVNIPKD HTNLLIQTAL
     HVKSDLAPHR LKMFSDIPLA RGLGSSSSVI VAGIELANQL GNLALSQKEK LEIATRLEGH
     PDNVAPAIFG DLVISSIVKN DIKSLEVMFP DSSFIAFIPN YELKTSDSRN VLPQKLSYED
     AVASSSVANV MVASLLKGDL VTAGWAIERD LFHERYRQPL VKEFGVIKQI STQNGAYATY
     LSGAGPTVMV LCSKEKEQPI VTELSKLCLD GQIQVLNIER KGVRVEKR