Phosphorylates the last serine residue (Ser-833) in the cytoplasmic domain of the low-density lipoprotein receptor from bovine adrenal cortex. Casein can also act as a substrate but with lower affinity. GTP can act instead of ATP.
Cofactor
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Atp + [low-density-lipoprotein receptor]-L-serine = adp + [low-density- lipoprotein receptor]-O-phospho-L-serine.