ID   KHSE_PHOPR              Reviewed;         318 AA.
AC   Q6LUP9;
DT   15-FEB-2005, integrated into UniProtKB/Swiss-Prot.
DT   05-JUL-2004, sequence version 1.
DT   03-AUG-2022, entry version 102.
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=PBPRA0553;
OS   Photobacterium profundum (strain SS9).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC   Photobacterium.
OX   NCBI_TaxID=298386;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-1253 / SS9;
RX   PubMed=15746425; DOI=10.1126/science.1103341;
RA   Vezzi A., Campanaro S., D'Angelo M., Simonato F., Vitulo N., Lauro F.M.,
RA   Cestaro A., Malacrida G., Simionati B., Cannata N., Romualdi C.,
RA   Bartlett D.H., Valle G.;
RT   "Life at depth: Photobacterium profundum genome sequence and expression
RT   analysis.";
RL   Science 307:1459-1461(2005).
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; CR378664; CAG18976.1; -; Genomic_DNA.
DR   RefSeq; WP_011217327.1; NC_006370.1.
DR   AlphaFoldDB; Q6LUP9; -.
DR   SMR; Q6LUP9; -.
DR   STRING; 298386.PBPRA0553; -.
DR   EnsemblBacteria; CAG18976; CAG18976; PBPRA0553.
DR   KEGG; ppr:PBPRA0553; -.
DR   eggNOG; COG0083; Bacteria.
DR   HOGENOM; CLU_041243_1_1_6; -.
DR   OMA; CANRIPH; -.
DR   OrthoDB; 610857at2; -.
DR   UniPathway; UPA00050; UER00064.
DR   Proteomes; UP000000593; Chromosome 1.
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; Reference proteome; Threonine biosynthesis;
KW   Transferase.
FT   CHAIN           1..318
FT                   /note="Homoserine kinase"
FT                   /id="PRO_0000156595"
FT   BINDING         97..107
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00384"
SQ   SEQUENCE   318 AA;  34538 MW;  53CBA468CFE5BBB7 CRC64;
     MSVVVYAPAS IGNVSVGFDV LGAAVSPIDG SLLGDRVEVA AGEQPFTLKC VGDFVAKLPV
     EQEENIVYHC WLVFARELDK KNIELKPVSM TLEKNMPIGS GLGSSACSVV AALDALNRFH
     NLPLNEVELL ALMGEMEAKI SGSLHYDNVA PCYLGGLQFM VQELGIISQP VPCFDDWYWV
     MAYPGIKVPT AEARAILPSQ YRRQDVIAHG RYLGGFIHAC HSQQPELAAK MVKDVVAEPY
     RERLLPGFSN ARQYALEAGA LASGISGSGP TMFSVCNDLE VAKRIARWLE DNYVQNDEGF
     VHVCRLDSTG SKVTGSEL