Mechanism of SHP2 activation by bis-Tyr-phosphorylated Gab1

Abstract: The non-receptor tyrosine phosphatase SHP2 (SH2 domain-containing protein tyrosine phosphatase 2) (PTPN11) is a regulator of diverse cellular functions including mitogenic activation and cell migration. It comprises two tandem Src-homology 2 (SH2) domains followed by the catalytic domain and is autoinhibited by the N-terminal SH2 domain blocking access to the active site. Mutations influencing auto-inhibition have been implicated in cancer and other diseases, and allosteric inhibitors have been developed that stabilize the inactive state. Here, we show that the intrinsically disordered bis-phosphorylated SHP2-activating peptide pY⁶²⁷pY⁶⁵⁹-Gab1 binds to both SH2 domains, undergoing partial ordering in the process. In addition to eliciting changes in SH2 domain dynamics, the peptide reorganizes their relative orientations to generate a new SH2-SH2 interface. Our data suggest an active conformation for SHP2 that is also applicable to the hematopoietic cell-specific SHP1 (PTPN6), shedding light on the activation mechanism of both enzymes and paving the way for the development of novel compounds to modulate SHP2 activity.

Keywords: signal transduction; tyrosine phosphatase; SH2 domain; protein structure; protein dynamics; X-ray crystallography; NMR; isothermal calorimetry; electron crystallography; allosteric activation

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