Analysis of anisotropic spin-label motion in saturation-transfer ESR spectra of spin-labeled cowpea chlorotic mottle virus |
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| Institution: | 1. State Key Laboratory of Natural and Biomimetic Drugs, Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China;2. Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada;3. Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada;4. Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada;5. Program in Molecular Medicine, Hospital for Sick Children Research Institute, Toronto, Ontario M5G 1X8, Canada;1. Departments of Molecular Genetics, Biochemistry and Chemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada;2. Laboratoire des biomolécules, LBM, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France;3. Hospital for Sick Children, Program in Molecular Medicine, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada |
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| Abstract: | A saturation-transfer ESR study is carried out on maleimide spin-labeled cowpea chlorotic mottle virus dissolved in various glycerol-water systems. The saturation-transfer ESR spectra were analyzed by comparing them with reference spectra of isotropically reorienting spin labels. The results are interpreted in terms of the overall motion of the virus particle, described by an isotropic rotational correlation time τR, and a local anisotropic spin-label motion with rotational correlation times τ| and τ⊥. |
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