Specific interactions outside the proline-rich core of two classes of Src homology 3 ligands.
Feng, S., Kasahara, C., Rickles, R.J., Schreiber, S.L.(1995) Proc Natl Acad Sci U S A 92: 12408-12415
- PubMed: 8618911
- DOI: https://doi.org/10.1073/pnas.92.26.12408
- Primary Citation of Related Structures:
1QWE, 1QWF - PubMed Abstract:
Two dodecapeptides belonging to distinct classes of Src homology 3 (SH3) ligands and selected from biased phage display libraries were used to investigate interactions between a specificity pocket in the Src SH3 domain and ligant residues flanking the proline-rich core. The solution structures of c-Src SH3 complexed with these peptides were solved by NMR. In addition to proline-rich, polyproline type II helix-forming core, the class I and II ligands each possesses a flanking sequence that occupies a large pocket between the RT and n-Src loops of the SH3 domain. Structural and mutational analyses illustrate how the two classes of SH3 ligands exploit a specificity pocket on the receptor differently to increase binding affinity and specificity.
Organizational Affiliation:
Howard Hughes Medical Institute, Department of Chemistry, Harvard University, Cambridge, MA 02138, USA.