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Members of the Prevotella intermedia group possess protein tyrosine phosphatase (PTPase). The purpose of this study was to investigate the effects of catechin derivatives from Japanese green tea on the activity of PTPase in P. intermedia and related organisms. Multilocus enzyme electrophoresis of alkaline phosphatase derived from P. intermedia, Prevotella nigrescens, Prevotella pallens and Porphyromonas gingivalis revealed a species‐specific migration pattern. Among the tea catechin derivatives tested, (–)‐epigallocatechin gallate (EGCg), similar to orthovanadate, a specific inhibitor for PTPase, was effective in inhibiting the PTPase activity in P. intermedia at 0.5 μm, and related species at 5 μm. The results suggested that the inhibitory effect observed is due to the presence of galloyl moiety in the structure. In contrast, neither the green tea catechins nor orthovanadate inhibited the phosphatase …