Struktura a dynamika peptidů a proteinů v roztoku:aplikace Ramanovy optické aktivity

Profant, Václav

The thesis inquires the specific and advantageous applications of Raman optical activity (ROA) in wide range of diverse structural and conformational studies of biomolecules and other biologically important molecules. Our investigation was focused on several interconnected topics covering the fields of methodology, basic and applied research. The combination of experimental and theoretical approaches facilitated deeper understanding of studied phenomena, and allowed for the effects of solute-solvent interactions. High-quality spectra of model molecules in the C-H stretching region, acquired as a result of successful extension of ROA measurements to the whole region of fundamental molecular vibrations, enabled verification and further development of methods for ROA spectra simulations encompassing anharmonic corrections. Utilizing spirodilactams with highly nonplanar amide groups, we have traced the specific ROA spectral manifestations of amide nonplanarity. In case of antimicrobial peptide lasiocepsine, we have successfully simulated ROA signals of S-S stretching vibrations which contrary to current belief do not seem to reflect sense of the S-S group torsion. In larger molecular systems, we have better understood the process of the formation of stable polyproline II conformation and proved that ROA may...

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