Journal
BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS
Volume 1700, Issue 1, Pages 53-64Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbapap.2004.03.016
Keywords
Grb2; SH2; binding kinetics; surface plasmon resonance; H/D mass spectrometry; protein structural dynamics
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Growth factor receptor-bound protein 2 (Grb2) is an extensively studied adaptor protein involved in cell signaling. Grb2 is a highly flexible protein composed of a single SH2 domain flanked by two SH3 domains. Here we report on the structural dynamic effects upon interaction of a phosphopeptide ligand derived from the recognition sequence of the Shc adaptor protein with (i) the isolated SH2 domain of Grb2 (Grb2 SH2) and (ii) the full-length Grb2 protein. From kinetic studies using surface plasmon resonance, it was deduced that a conformation change occurred in the SH2 protein as well as the full-length Grb2 after binding. Measurements of hydrogen/deuterium exchange (HDX) in the isolated SH2 domain and full-length Grb2 protein as monitored by electrospray mass spectrometry, showed that binding reduces the overall flexibility of the proteins, possibly via slightly different mechanisms for the single SH2 domain and the full-length Grb2 protein. (C) 2004 Elsevier B.V. All rights reserved.
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