Homoserine kinase
homoserine kinase | |||||||||
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Homoserine kinase tetramer, Methanocaldococcus jannaschii | |||||||||
Identifiers | |||||||||
EC no. | 2.7.1.39 | ||||||||
CAS no. | 9026-58-8 | ||||||||
Databases | |||||||||
IntEnz | IntEnz view | ||||||||
BRENDA | BRENDA entry | ||||||||
ExPASy | NiceZyme view | ||||||||
KEGG | KEGG entry | ||||||||
MetaCyc | metabolic pathway | ||||||||
PRIAM | profile | ||||||||
PDB structures | RCSB PDB PDBe PDBsum | ||||||||
Gene Ontology | AmiGO / QuickGO | ||||||||
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In enzymology, a homoserine kinase (EC 2.7.1.39) is an enzyme that catalyzes the chemical reaction
- ATP + L-homoserine ADP + O-phospho-L-homoserine
Thus, the two substrates of this enzyme are ATP and L-homoserine, whereas its two products are ADP and O-phospho-L-homoserine.
This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:L-homoserine O-phosphotransferase. Other names in common use include homoserine kinase (phosphorylating), and HSK. This enzyme participates in glycine, serine and threonine metabolism.
Structural studies
As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes 1FWK, 1FWL, 1H72, 1H73, 1H74, and 2PPQ.
References
- FLAVIN M, SLAUGHTER C (1960). "Purification and properties of threonine synthetase of Neurospora". J. Biol. Chem. 235: 1103–8. PMID 13823379.
- Watanabe Y, Konishi S, Shimura K (1957). "Biosynthesis of threonine from homoserine. VI. Homoserine kinase". J. Biochem. 44 (5): 299–307. doi:10.1093/oxfordjournals.jbchem.a126756.
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phosphotransferase/kinase
(PO4)
2.7.1: OH acceptor | |
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2.7.2: COOH acceptor | |
2.7.3: N acceptor | |
2.7.4: PO4 acceptor |
(P2O7)
(PO4-nucleoside)
Polymerase |
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Phosphorolytic 3' to 5' exoribonuclease | |||||
Nucleotidyltransferase | |||||
Guanylyltransferase | |||||
Other |
Phosphatidyltransferases | |
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Glycosyl-1-phosphotransferase |
(PO4; protein acceptor)
2.7.10: protein-tyrosine |
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2.7.11: protein-serine/threonine |
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2.7.12: protein-dual-specificity |
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2.7.13: protein-histidine |