Coordination geometries and vibrational properties of cytochromes alpha and alpha 3 in cytochrome oxidase from Soret excitation Raman spectroscopy.
Coordination geometries and vibrational properties of cytochromes alpha and alpha 3 in cytochrome oxidase from Soret excitation Raman spectroscopy.
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来自 Soret 激发拉曼光谱的细胞色素氧化酶中细胞色素 α 和 α 3 的协调几何结构和振动特性。
DOI:
10.1021/bi00507a049
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Salmeen,I
中科院分区:
文献类型:
--
作者:
Babcock,GT;Callahan,PM;Ondrias,MR;Salmeen,I
Gerald T. Babcock,* Patricia M. Callahan, Mark R. Ondrias,* and Irving Salmeen* abstract: Raman spectra have been recorded for oxidized, reduced, and inhibitor complexed cytochrome oxidase species. By judicious choice of laser excitation frequency in relation to the Soret optical absorption properties of cytochromes a and a3, we have been able to enhance selectively and identify characteristic vibrations of thetwo iron chromophores. On the basis of a comparison of these assignments toRaman spectra of heme a model compounds, we conclude that cytochrome a3 is six-coordinate and high-spin in the oxidized en-zyme but five-coordinate and high-spin in the reduced protein; cytochrome a is six-coordinate and low-spin in both redox states of the enzyme. Cytochrome o3 appears to be in a hydrophobic environment in its common valence states. In ox-ygenated cytochrome oxidase, formed by air oxidation of the reduced enzyme, cytochrome<? 33+ shows vibrational frequen-cies similar to those exhibited by low-spin heme a species. This
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影响因子:
4.4
作者:
P. Champion;A. C. Albrecht
通讯作者:
A. C. Albrecht
影响因子:
15
作者:
L. Vickery;T. Nozawa;K. Sauer
通讯作者:
K. Sauer
影响因子:
3.9
作者:
Maria Erecińska;David F. Wilson
通讯作者:
David F. Wilson
DOI:
10.1042/bj1710787
发表时间:
1978
期刊:
The Biochemical journal
影响因子:
--
作者:
B. Chance;C. Saronio;J. Leigh;W. Ingledew;T. King
通讯作者:
T. King
影响因子:
4.4
作者:
R. Clark;B. Stewart
通讯作者:
B. Stewart