The Role of Water Molecules in the Binding of Class I and II Peptides to the SH3 Domain of the Fyn Tyrosine Kinase

Camara-Artigas et al., Acta Crystallographica (2016) - PMID: 27599862

Product(s) used in this publication:  Custom Peptide Synthesis

Abstract:

Interactions of proline-rich motifs with SH3 domains are present in signal transduction and other important cell processes. Analysis of structural and thermodynamic data suggest a relevant role of water molecules in these protein-protein interactions. To determine whether or not the SH3 domain of the Fyn tyrosine kinase shows the same behaviour, the crystal structures of its complexes with two high-affinity synthetic peptides, VSL12 and APP12, which are class I and II peptides, respectively, have been solved. In the class I complexes two water molecules were found at the binding interface that were not present in the class II complexes. The structures suggest a role of these water molecules in facilitating conformational changes in the SH3 domain to allow the binding of the class I or II peptides. In the third binding pocket these changes modify the cation-π and salt-bridge interactions that determine the affinity of the binding. Comparison of the water molecules involved in the binding of the peptides with previous reported hydration spots suggests a different pattern for the SH3 domains of the Src tyrosine kinase family.

KEYWORDS:

Fyn tyrosine kinase; SH3 domain; X-ray crystal structure; proline-rich motifs

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