[hydroxymethylglutaryl-CoA reductase (NADPH)] kinase activity
[hydroxymethylglutaryl-coa reductase (nadph)] kinase activity
Catalysis of the reaction: [3-hydroxy-3-methylglutaryl-CoA reductase (NADPH)] + ATP = [3-hydroxy-3-methylglutaryl-CoA reductase (NADPH)] phosphate + ADP.