What is the molecular weight (mw) of glycogen phosphorylase?

188 kDa

Glycogen phosphorylase is the enzyme responsible for glycogen breakdown in liver and muscle. It exists in two forms, unphosphorylated phosphorylase b and phosphorylase a with two Ser-PO₄^2– groups. Glycogen phosphorylase is a dimer of two identical 94 kDa subunits. It has a total molecular weight of 188 kDa, which is equivalent to 188,000 g/mol.