What is Low-density-lipoprotein receptor kinase?

In enzymology, a low-density-lipoprotein receptor kinase is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are ATP and -L-serine]], whereas its two products are ADP and -O-phospho-L-serine]].

This enzyme belongs to the family of transferases, specifically those transferring a phosphate group to the sidechain oxygen atom of serine or threonine residues in proteins. The systematic name of this enzyme class is ATP:-L-serine O-phosphotransferase. Other names in common use include ATP:low-density-lipoprotein-L-serine O-phosphotransferase, LDL receptor kinase, kinase, low-density lipoprotein kinase, low-density-lipoprotein receptor kinase , and STK7.