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
Salmeen,I
中科院分区:
生物学3区
文献类型:
--
作者:
Babcock,GT;Callahan,PM;Ondrias,MR;Salmeen,I

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Gerald T. Babcock,* Patricia M. Callahan, Mark R. Ondrias,*和Irving Salmeen*摘要:记录了氧化、还原和抑制剂络合细胞色素氧化酶的拉曼光谱。通过对激光激发频率与细胞色素a和a3的Soret光学吸收特性的明智选择,我们已经能够选择性地增强和识别两种铁发色团的特征振动。通过对血红素a模型化合物的toRaman光谱的比较,我们得出细胞色素a3在氧化酶中为六坐标和高自旋,而在还原蛋白中为五坐标和高自旋;细胞色素a在酶的两种氧化还原状态下都是六坐标和低自旋的。细胞色素o3在其共价态下似乎处于疏水环境中。在氧合细胞色素氧化酶中,由空气氧化还原酶形成,细胞色素<?33+显示出与低自旋血红素a相似的振动频率。这
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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DOI: 10.1063/1.438455
发表时间: 1979
影响因子: 4.4
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