Abstract
The p120RasGAP protein contains two Src homology 2 (SH2) domains, each with phosphotyrosine-binding activity. We describe the crystallization of the isolated and purified p120RasGAP SH2 domains with phosphopeptides derived from a binding partner protein, p190RhoGAP. Purified recombinant SH2 domain protein is mixed with synthetic phosphopeptide at a stoichiometric ratio to form the complex in vitro. Crystallization is then achieved by the hanging drop vapor diffusion method over specific reservoir solutions that yield single macromolecular co-crystals containing SH2 domain protein and phosphopeptide. This protocol yields suitable crystals for X-ray diffraction studies, and our recent X-ray crystallography studies of the two SH2 domains of p120RasGAP demonstrate that the N-terminal SH2 domain binds phosphopeptide in a canonical interaction. In contrast, the C-terminal SH2 domain binds phosphopeptide via a unique atypical binding mode. The crystallographic studies for p120RasGAP illustrate that although the three-dimensional structure of SH2 domains and the molecular details of their binding to phosphotyrosine peptides are well defined, careful structural analysis can continue to yield new molecular-level insights.
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Acknowledgments
We acknowledge Rachel Jaber Chehayeb and Jessica Wang. Kimberly Vish is acknowledged for helpful comments. This research was supported by 1R01NS117609 and 1R01GM138411 to T.J.B.
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Stiegler, A.L., Boggon, T.J. (2023). Structure Determination of SH2–Phosphopeptide Complexes by X-Ray Crystallography: The Example of p120RasGAP. In: Carlomagno, T., Köhn, M. (eds) SH2 Domains. Methods in Molecular Biology, vol 2705. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-3393-9_5
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