The temperature‐dependent protein dynamical transition is investigated using the Instanteous Normal mode analysis (INM) and molecular dynamics (MD) simulation of crystalline myoglobin and Toxin II. The onset of anharmonic dynamics in myoglobin is observed at 150 K, far below the much‐studied solvent‐activated dynamical transition at 220 K. A significant fraction of methyl groups exhibit nanosecond anharmonic rotational jump diffusion at 150 K indicating the essential role of methyl dynamics in the low‐temperature onset of anharmonic protein dynamics. The methyl groups that exhibit many rotational excitations are located near xenon cavities, suggesting that cavities in proteins act as activation centers of anharmonic dynamics. INM analysis of Toxin II indicates the presence of non‐zero barrier‐crossing, diffusive degrees of freedom accessible to the protein below the dynamical transition. The number of these diffusive degrees of freedom increases abruptly at the dynamical transition. In summary, the present investigation suggests that local diffusive processes (for example, methyl dynamics) are activated at low temperatures (much below 220 K) leading to global diffusive protein dynamics (this involves excitation of many protein atoms) at the dynamical transition.
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9 March 2009
THEORY AND APPLICATIONS OF COMPUTATIONAL CHEMISTRY—2008
23–27 September 2008
Shanghai (China)
Research Article|
March 09 2009
Protein Dynamical Transition: Role of Methyl Dynamics and Local Diffusion
M. Krishnan;
M. Krishnan
Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley, Oak Ridge, Tennessee
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R. Schulz;
R. Schulz
Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley, Oak Ridge, Tennessee
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Jeremy C. Smith
Jeremy C. Smith
Center for Molecular Biophysics, Oak Ridge National Laboratory, 1 Bethel Valley, Oak Ridge, Tennessee
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AIP Conf. Proc. 1102, 122–131 (2009)
Citation
M. Krishnan, R. Schulz, Jeremy C. Smith; Protein Dynamical Transition: Role of Methyl Dynamics and Local Diffusion. AIP Conf. Proc. 9 March 2009; 1102 (1): 122–131. https://doi.org/10.1063/1.3108363
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