Furin-, ADAM 10-, and gamma-secretase-mediated cleavage of a receptor tyrosine phosphatase and regulation of beta-catenin's transcriptional activity.

Molecular and Cellular Biology
Lars AndersAxel Ullrich

Abstract

Several receptor protein tyrosine phosphatases (RPTPs) are cell adhesion molecules involved in homophilic interactions, suggesting that RPTP outside-in signaling is coupled to cell contact formation. However, little is known about the mechanisms by which cell density regulates RPTP function. We show that the MAM family prototype RPTPkappa is cleaved by three proteases: furin, ADAM 10, and gamma-secretase. Cell density promotes ADAM 10-mediated cleavage and shedding of RPTPkappa. This is followed by gamma-secretase-dependent intramembrane proteolysis of the remaining transmembrane part to release the phosphatase intracellular portion (PIC) from the membrane, thereby allowing its translocation to the nucleus. When cells were treated with leptomycin B, a nuclear export inhibitor, PIC accumulated in nuclear bodies. PIC is an active protein tyrosine phosphatase that binds to and dephosphorylates beta-catenin, an RPTPkappa substrate. The expression of RPTPkappa suppresses beta-catenin's transcriptional activity, whereas the expression of PIC increases it. Notably, this increase required the phosphatase activity of PIC. Thus, both isoforms have acquired opposing roles in the regulation of beta-catenin signaling. We also found that RPT...Continue Reading

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