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In enzymology, a homoserine kinase is an enzyme that catalyzes the chemical reaction

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 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 , and HSK. This enzyme participates in glycine, serine and threonine metabolism.

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