Calculating vibrational frequencies of amides: From formamide to concanavalin A
文献情報
Tim M. Watson, Jonathan D. Hirst
The infrared (IR) is an information rich region of molecular spectra. From characteristic absorptions it is possible to determine much structural information about molecules. This has been used to a large degree in the study of protein structure as a complementary technique to circular dichroism, X-ray crystallography and NMR. However, the current understanding of protein IR spectra is predicated largely on empirical structure–spectra relationships that are not infallible. Providing a theoretical basis for protein spectra will help to reduce these problems. In this paper, we review our recent work on accurate and computationally efficient small molecule gas phase calculations and examine how point charge environments can mimic features of proteins. We then develop a general automated strategy for applying the transition dipole coupling method for computing the IR spectra of proteins. Finally, we study the effect of conformational dynamics on the amide I band of concanavalin A.
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