The enzyme [hydroxymethylglutaryl-CoA reductase ]-phosphatase catalyzes the reaction [hydroxymethylglutaryl-CoA reductase ] phosphate + H2O ⇌ {\displaystyle \rightleftharpoons } [hydroxymethylglutaryl-CoA reductase ] + phosphateThis enzyme belongs to the family of hydrolases, specifically those acting on phosphoric monoester bonds. Wikipedia