L-seryl-[low-density-lipoprotein receptor] + ATP <=> O-phospho-L-seryl-[low-density-lipoprotein receptor] + ADP + H(+)
l-seryl-[low-density-lipoprotein receptor] + atp <=> o-phospho-l-seryl-[low-density-lipoprotein receptor] + adp + h(+)