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Spectral studies of human erythrocyte catalase


, : Spectral studies of human erythrocyte catalase. Canadian Journal of Biochemistry 57(4): 321-329

The optical absorption and circular dichroic spectra of human erythrocyte catalase (EC 1.11.1.6) and its cyanide, azide, and fluoride derivatives over the wavelength range of 210 to 700 nm are reported. Treatment with acid or alkaline solutions causes spectral changes which may be due to dissociation of the enzyme into subunits and removal of the heme group from the protein. The fractions of the protein structure present as alpha helix, beta pleated sheet, and unordered structure have been estimated from the CD spectrum in the far-ultraviolet region. The CD spectra also indicate that the protein conformation does not change appreciably after cyanide binding. The epr spectroscopy of the native enzyme and its cyanide complex are reported. The spectral results are compared with catalase obtained from other mammalian and bacterial sources.

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Accession: 041408961

PMID: 221084

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