Application

Phosphorylase from rabbit muscle has been used in a study to assess the molecular mechanisms of oleanolic acid. It has also been used in a study to describe the conversion of phosphorylase B to A, through a conversion enzyme in the presence of ³²P-ATP.

Phosphorylase a from rabbit muscle has been used to mix with glycogen for the preparation of limit dextrin. It has also been used to probe the array in oligosaccharide microarray analysis of phosphorylase activity.

Biochem/physiol Actions

Phosphorylase participates in glycogenolysis. Deficiency of phosphorylase leads to several glycogen storage diseases with hepatomegaly.

Phosphorylase A can be inhibited by these compounds: Polychlorinated biphenyls, polychlorinated biphenylols and polybrominated biphenyls.

Dimeric phosphorylase b is converted to the more active tetramer, phosphorylase a, by the action of phosphorylase kinase.

General description

Phosphorylase A is the active form of glycogen phosphorylase which converts glycogen and orthophosphate (Pi) to glucose 1-phoshate (G-1-P).

Packaging

10, 25 mg in poly bottle

Physical form

Lyophilized powder containing β-glycerophosphate and EDTA

Unit Definition

One unit will form 1.0 µmole of α-D-glucose 1-phosphate from glycogen and orthophosphate per min at pH 6.8 at 30 °C, measured in a system containing phosphoglucomutase, NADP, and glucose-6-phosphate dehydrogenase. (One µmolar unit is equivalent to ~45 Cori units.)