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Updated: May 16, 2026

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
Published on: April 13, 2022
Coupled flexibility change in cytochrome P450cam substrate binding determined by neutron scattering, NMR, and
Yinglong Miao1, Zheng Yi, Carey Cantrell
1University of Tennessee/Oak Ridge National Laboratory Center for Molecular Biophysics, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
Abstract:
Neutron scattering and nuclear magnetic resonance relaxation experiments are combined with molecular dynamics (MD) simulations in a novel, to our knowledge, approach to investigate the change in internal dynamics on substrate (camphor) binding to a protein (cytochrome P450cam). The MD simulations agree well with both the neutron scattering, which furnishes information on global flexibility, and the nuclear magnetic resonance data, which provides residue-specific order parameters. Decreased fluctuations are seen in the camphor-bound form using all three techniques, dominated by changes in specific regions of the protein. The combined experimental and simulation results permit a detailed description of the dynamical change, which involves modifications in the coupling between the dominant regions and concomitant substrate access channel closing, via specific salt-bridge, hydrogen-bonding, and hydrophobic interactions. The work demonstrates how the combination of complementary experimental spectroscopies with MD simulation can provide an in-depth description of functional dynamical protein changes.
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