Abstract
Vibrational Stark effect (VSE) spectroscopy provides a direct measure of electrostatic fields within proteins. VSE also provides a unique way, still underutilized, to test the accuracy of electrostatic interactions in realistic finite-temperature simulations. Here, we quantify the electrostatic contributions of residues surrounding the catalytic reaction center in ketosteroid isomerase. Our goal is to understand how inter-residue charge transfer and local and non-local polarization affect the electric field at a molecular probe inside the protein. In particular, we show that polarization effects and charge transfer are essential to capture the correct thermodynamic structural average, which in turn affects the Stark shift.
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This work was partially supported by a grant from the National Science Foundation (CHE-1404998).
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Richard, A.M., Gascón, J.A. Protein polarization effects in the thermodynamic computation of vibrational Stark shifts. Theor Chem Acc 139, 9 (2020). https://doi.org/10.1007/s00214-019-2522-2
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DOI: https://doi.org/10.1007/s00214-019-2522-2