Molecular motion of spin labeled side chains in the C-terminal domain of RGL2 protein: a SDSL-EPR and MD study |
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Authors: | Pistolesi Sara Ferro Elisa Santucci Annalisa Basosi Riccardo Trabalzini Lorenza Pogni Rebecca |
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Affiliation: | Department of Chemistry, University of Siena, Via A. Moro, 53100 Siena, Italy. |
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Abstract: | Five singly spin labeled side chains at surface sites in the C-terminal domain of RGL2 protein have been analyzed to investigate the general relationship between nitroxide side chain mobility and protein structure. At these sites, the structural perturbation produced by replacement of a native residue with a nitroxide side chain appears to be very slight at the level of the backbone fold. The primary determinants of the nitroxide side chain mobility are backbone dynamics and tertiary interactions. On the exposed surfaces of alpha-helices, the side chain mobility is not restricted by tertiary interactions but appears to be determined by backbone dynamics, while in loop sites, the side chain mobility is even higher. For a better understanding of the changes in the EPR spectral line shape, molecular dynamics simulations were performed and found in agreement with EPR spectral data. |
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Keywords: | RGL2, RalGDS like protein-2 SDSL, site-directed spin labeling EPR, electron paramagnetic resonance MD, molecular dynamics RBD, Ras binding domain |
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