Identification of Receptor Protein Tyrosine Phosphatases (RPTPs) as Regulators of Receptor Tyrosine Kinases (RTKs) Using an RPTP siRNA-RTK Substrate Screen

Receptor tyrosine kinase (RTK) signaling exists in equilibrium between RTK tyrosyl phosphorylation and RTK tyrosyl dephosphorylation. Despite a detailed understanding of RTK tyrosyl phosphorylation, much less is known about RTK tyrosyl dephosphorylation. The receptor PTPs (RPTPs) are outstanding targets for the dephosphorylation of RTKs because of their mutual membrane proximity. In this chapter, we describe how to identify RPTPs that modulate the activity of RTKs using a siRNA screen and commercially available proteomic applications. The validation of putative RTKs as RPTP substrates using substrate-trapping approaches is detailed.

Source: Springer protocols feed by Protein Science - October 17, 2014 Category: Biochemistry Source Type: news