On the mechanism of action of muscle and potato phosphorylase.

It has recently been reported by Doudoroff, Barker, and Hassid (1) t’hat an exchange occurs between the phosphate group of glucose-l-phosphate and inorganic phosphate in the presence of sucrose phosphorylase and in the absence of acceptor. On the basis of this exchange, they postulate a mechanism involving the formation of an enzyme-glucose complex, thus endowing the enzyme wit,h the ability to transfer glucose to fructose and other acceptors; viz.,