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Evidence of A and E 1 Normal Mode Absorbances in the Infrared Spectrum of Hemoglobin

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Abstract:

In an FT-IR study of the secondary structure of proteins, several concentrations, cell pathlengths, resolution values, and machine parameters were investigated. During this investigation we observed that 1-cm−1 resolution spectra of hemoglobin enhanced by second derivatives revealed an additional band in the α-helix region. Krimm and co-workers predicted the existence of two absorbances in the infrared amide I region (1600-1700 cm−1) of α-helical proteins in solution that correspond to the A and E 1 amide carbonyl vibrational modes. However, they observed only one band in the α-helix region at 2 cm−1 resolution.

Keywords: FT-IR; Fourier transform; Protein

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/0003702904086966

Affiliations: U.S. Department of Agriculture, Agricultural Research Service, Northern Regional Research Center, 1815 North University Street, Peoria, Illinois 61604

Publication date: June 1, 1990

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