Abstract
We report density functional theory (DFT) calculations of the Raman spectra for hexapepetides of glutamic acid and lysine in three different conformations (α, β and PPII). The wave numbers of amide I, amide II and amide III bands of all three conformations predicted at B3LYP/6-31G and B3LYP/6-31G* are in good agreement with previously reported experimental values of polyglutamic acid and polylysine. Agreement with experiment improves when polarization functions are included in the basis set. Explicit water molecules, H-bonded to the backbone amide groups were found to be absolutely necessary to obtain this agreement. Our results indicate that DFT is a promising tool for assignment of the spectral data on kinetics of conformational changes for peptides during amyloid formation.
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Acknowledgments
This work was supported in part by the National Science Foundation (CCF/CHE 0832622). The authors are thankful to University of Central Florida (UCF) Institute for Simulations and Training (IST) HPC Stokes facility, UCF I2Lab, and the US Department of Energy National Energy Research Scientific Computing Center (DOE NERSC) for the generous donation of computer time. The authors would like to thank Prof. Alfonse Schulte for fruitful discussions.
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Berhanu, W.M., Mikhailov, I.A. & Masunov, A.E. Are density functional theory predictions of the Raman spectra accurate enough to distinguish conformational transitions during amyloid formation?. J Mol Model 16, 1093–1101 (2010). https://doi.org/10.1007/s00894-009-0610-2
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DOI: https://doi.org/10.1007/s00894-009-0610-2