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- W2605819511 abstract "The electron spin resonance (ESR) spectra of spin-labeled proteins are sensitive to dynamics, but discrimination between the various dynamics is often difficult. Here, we report an improvement in ESR spectral sensitivity to local backbone dynamics of a protein by a methodology that performs ESR measurement when the protein is confined in the nanochannels of a mesoporous material. An extensive set of ESR data, which includes the spectra of a nitroxide-based side chain from buried and solvent-exposed sites of a T4 lysozyme (T4L) protein, were obtained over a range of temperatures, 200–300 K, to explore the dynamics of T4L under nanoconfinement. Spectra were simulated by performing theoretical fits to the data using the microscopic ordering with macroscopic disordering model. Two principle dynamic modes, which differ in mobility and ordering, are required to account for the spectra at temperatures >240 K. We show that the mobile one correlates only with the local backbone dynamics of buried sites, whereas the other reflects the difference in local hydration dynamics between the labeling sites in T4L. The assignment of the mobile component is supported by the X-ray crystallography data of T4L. Collectively, this study has demonstrated the validity of such a methodology for improving ESR sensitivity to buried sites in a protein." @default.
- W2605819511 created "2017-04-28" @default.
- W2605819511 creator A5003070282 @default.
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- W2605819511 creator A5091824929 @default.
- W2605819511 date "2017-04-24" @default.
- W2605819511 modified "2023-10-18" @default.
- W2605819511 title "Study of Protein Dynamics under Nanoconfinement by Spin-Label ESR: A Case of T4 Lysozyme Protein" @default.
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- W2605819511 doi "https://doi.org/10.1021/acs.jpcb.7b00014" @default.
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