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Crystalline preparations of glycogen phosphorylase b contain traces of acid phosphatase activity. Non-denaturing gel electrophoresis of phosphorylase b reveals a single band of 1-naphthyl phosphate phosphohydrolase activity which co-migrates with phosphorylase. The two enzymes can be separated by Sephadex G-200 column chromatography, where the phosphatase exhibits an apparent Mr of 17,000. The contaminant enzyme hydrolyzes effectively the phenolic ester of monoorthophosphate with optimal activity for p-nitrophenyl phosphate and L-phosphotyrosine between pH 5.5 and 6.0. The phosphatase is insensitive to inhibition by L(+)-tartrate but strongly inhibited by microM vanadate and Zn2+.
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