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Updated: Aug 13, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
Protein structure by Fourier transform infrared spectroscopy: second derivative spectra
Abstract:
Second derivative Fourier transform infrared spectra of the proteins ribonuclease A, hemoglobin, and beta-lactoglobulin A (native and denatured) have been obtained in deuterium oxide solution from 1350 to 1800 cm-1. The relationship of the original spectra to their second derivatives is briefly discussed. In the second derivative spectra, clearly resolved peaks are observed which can be associated with the alpha-helix, beta-strands, and turns. No protein spectra with such resolution have heretofore been reported. Tentative assignments are proposed, and the observed peaks are related to the secondary structure of the proteins studied. The data appear to present the first direct spectroscopic evidence of turns in a native protein.
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