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Cloning and expression of protein tyrosine phosphatase-like protein derived from a rat pheochromocytoma cell line.

A novel protein [designated protein tyrosine phosphatase-like protein (PTPLP)] which is distantly related to receptor-type protein tyrosine phosphatases (PTPases) was cloned from a rat pheochromocytoma cell line. The PTPLP was detected exclusively in the brain. Overexpression of the PTPLP decreased the basal PTPase activity of COS-7 cells for Raytide. These results suggest that PTPLP may function as a negative regulator of PTPases in neuronal tissues.