Detection of Heme-Distortions in Ferri- and Ferrocyto-Chrome C by Resonance Raman Scattering
作者:
U. Kubitschek,
W. Dreybrodt,
R. Schweitzer-stenner,
期刊:
Spectroscopy Letters
(Taylor Available online 1986)
卷期:
Volume 19,
issue 6
页码: 681-690
ISSN:0038-7010
年代: 1986
DOI:10.1080/00387018608069272
出版商: Taylor & Francis Group
关键词: Resonance Raman scattering;cytochrome c;distortions of the heme group
数据来源: Taylor
摘要:
We have measured the depolarization ratio and polarized intensities of the oxidation marker A1g-Raman line at 1363 cm−1and 1375 cm−1in ferri- and ferrocytochrome c respectively. From these data we derive symmetry classified distortions of the heme group from its ideal D4h-symmetry. In ferrocytochrome c these distortions are independent of the pH-value of the solution, indicating that the heme environment is stable with respect to pH. In ferricytochrome c we observe pH-dependent changes of the distortions, indicating the well known conformational change with pK = 9.05, where the methionine 80 ligand is replaced by lysine-79. The data indicate that in this conformation due to opening of the heme crevice the heme group has a higher effective symmetry.
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