L-seryl-[3-hydroxy-3-methylglutaryl-coenzyme A reductase] + ATP <=> O-phospho-L-seryl-[3-hydroxy-3-methylglutaryl-coenzyme A reductase] + ADP + H(+)
l-seryl-[3-hydroxy-3-methylglutaryl-coenzyme a reductase] + atp <=> o-phospho-l-seryl-[3-hydroxy-3-methylglutaryl-coenzyme a reductase] + adp + h(+)