ID   KHSE_RHILW              Reviewed;         321 AA.
AC   B5ZSW0;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   25-NOV-2008, sequence version 1.
DT   04-NOV-2026, entry version 105.
DE   RecName: Full=Homoserine kinase {ECO:0000255|HAMAP-Rule:MF_00301};
DE            Short=HK {ECO:0000255|HAMAP-Rule:MF_00301};
DE            Short=HSK {ECO:0000255|HAMAP-Rule:MF_00301};
DE            EC=2.7.1.39 {ECO:0000255|HAMAP-Rule:MF_00301};
GN   Name=thrB {ECO:0000255|HAMAP-Rule:MF_00301};
GN   OrderedLocusNames=Rleg2_0612;
OS   Rhizobium leguminosarum bv. trifolii (strain WSM2304).
OC   Bacteria; Pseudomonadati; Pseudomonadota; Alphaproteobacteria;
OC   Hyphomicrobiales; Rhizobiaceae; Rhizobium/Agrobacterium group; Rhizobium.
OX   NCBI_TaxID=395492;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=WSM2304;
RX   PubMed=21304679; DOI=10.4056/sigs.44642;
RA   Reeve W., O'Hara G., Chain P., Ardley J., Brau L., Nandesena K., Tiwari R.,
RA   Malfatti S., Kiss H., Lapidus A., Copeland A., Nolan M., Land M.,
RA   Ivanova N., Mavromatis K., Markowitz V., Kyrpides N., Melino V., Denton M.,
RA   Yates R., Howieson J.;
RT   "Complete genome sequence of Rhizobium leguminosarum bv trifolii strain
RT   WSM2304, an effective microsymbiont of the South American clover Trifolium
RT   polymorphum.";
RL   Stand. Genomic Sci. 2:66-76(2010).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=L-homoserine + ATP = O-phospho-L-homoserine + ADP + H(+);
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_00301};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-threonine biosynthesis; L-threonine
CC       from L-aspartate: step 4/5. {ECO:0000255|HAMAP-Rule:MF_00301}.
CC   -!- SIMILARITY: Belongs to the pseudomonas-type ThrB family.
CC       {ECO:0000255|HAMAP-Rule:MF_00301}.
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DR   EMBL; CP001191; ACI53909.1; -; Genomic_DNA.
DR   RefSeq; WP_012556816.1; NC_011369.1.
DR   AlphaFoldDB; B5ZSW0; -.
DR   SMR; B5ZSW0; -.
DR   STRING; 395492.Rleg2_0612; -.
DR   KEGG; rlt:Rleg2_0612; -.
DR   eggNOG; COG2334; Bacteria.
DR   HOGENOM; CLU_053300_0_0_5; -.
DR   OMA; AACRFWS; -.
DR   UniPathway; UPA00050; UER00064.
DR   Proteomes; UP000008330; Chromosome.
DR   GO; GO:0004413; F:homoserine kinase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009088; P:L-threonine biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd05153; HomoserineK_II; 1.
DR   Gene3D; 3.90.1200.10; -; 1.
DR   Gene3D; 3.30.200.20; Phosphorylase Kinase, domain 1; 1.
DR   HAMAP; MF_00301; Homoser_kinase_2; 1.
DR   InterPro; IPR002575; Aminoglycoside_PTrfase.
DR   InterPro; IPR005280; Homoserine_kinase_II.
DR   InterPro; IPR011009; Kinase-like_dom_sf.
DR   InterPro; IPR050249; Pseudomonas-type_ThrB.
DR   NCBIfam; NF003558; PRK05231.1; 1.
DR   NCBIfam; TIGR00938; thrB_alt; 1.
DR   PANTHER; PTHR21064:SF6; AMINOGLYCOSIDE PHOSPHOTRANSFERASE DOMAIN-CONTAINING PROTEIN; 1.
DR   PANTHER; PTHR21064; AMINOGLYCOSIDE PHOSPHOTRANSFERASE DOMAIN-CONTAINING PROTEIN-RELATED; 1.
DR   Pfam; PF01636; APH; 1.
DR   SUPFAM; SSF56112; Protein kinase-like (PK-like); 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; ATP-binding; Kinase; Nucleotide-binding;
KW   Reference proteome; Threonine biosynthesis; Transferase.
FT   CHAIN           1..321
FT                   /note="Homoserine kinase"
FT                   /id="PRO_1000115440"
SQ   SEQUENCE   321 AA;  35826 MW;  CF0E83F22C27CF37 CRC64;
     MAVYTDIAED DLKWFLTEYD AGTLLSYKGI AEGVENSNFL LHTSKDPLIL TLYEKRVEKT
     DLPFFLGLMQ HLSARGLSCP LPLPRRDGAL LGSLSGRPAA LISFLEGMWL RKPEAKHCRE
     VGRALAEMHV AGDGFELKRP NALSIDGWQT LWEKSEARAG EVEAGLQDEI RGELDFLAAA
     WPKNLPAGII HADLFPDNVF FLGDALSGLI DFYFACNDLL AYDVSICLNA WCFEKDGAYN
     ITKGTAMLEG YQSVRPLSGE EIAALPVLSR GSALRFFLTR LYDWLTTPEG AMVTKKDPLE
     YLRKLRFHRQ IKSPAEYGLS L
//