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Microsecond Timescale Dynamics of GDP‐Bound Ras Underlies the Formation of Novel Inhibitor‐Binding Pockets
Author(s) -
Mao Yunyun,
Yao Haijie,
Wang Hui,
Cheng Peng,
Long Dong
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201608653
Subject(s) - microsecond , druggability , molecular dynamics , chemistry , small molecule , relaxation (psychology) , biophysics , mutant , stereochemistry , biology , biochemistry , physics , computational chemistry , astronomy , gene , neuroscience
The recent discovery of inhibitory compounds binding to distinct pockets on GDP‐bound Ras has renewed the view on the druggability of this crucial cancer driver. However, the origin of these pockets, which are not readily formed in the crystal structure in the absence of the compounds, is yet unclear. Herein, we explored the intrinsic flexibility of Ras⋅GDP on microsecond to millisecond timescales using relaxation‐based NMR experiments, and identified substantial slow dynamics with τ ex of 34 μs at 5 °C, which maps to the regions showing a high level of correlation with those displaying conformational differences between the inhibitor‐bound and free states. These findings, which have been demonstrated in both wild‐type Ras and the oncogenic mutant (G12V), support the mechanism of extended conformational selection for Ras–inhibitor interactions where the small molecules redistribute the protein conformational ensemble favoring the final bound states.