Isolation, characterisation and crystallisation of a water-soluble fragment of the Rieske iron-sulfur protein of bovine heart mitochondrial bc1 complex.

Isolation, characterisation and crystallisation of a water-soluble fragment of the Rieske iron-sulfur protein of bovine heart mitochondrial bc1 complex.
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牛心脏线粒体 bc1 复合物 Rieske 铁硫蛋白水溶性片段的分离、表征和结晶。

DOI:
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发表时间:
1996
期刊:
European Journal of Biochemistry
影响因子:
--
通讯作者:
G. von Jagow
G. von Jagow
中科院分区:
--
文献类型:
--
作者:
T. Link;M. Saynovits;C. Aßmann;S. Iwata;T. Ohnishi;G. von Jagow

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A water-soluble fragment of the bc1 complex from bovine heart mitochondria was isolated containing the intact Rieske [2Fe-2S] cluster. The fragment consists of the last 129 amino acid residues of the Rieske iron-sulfur protein and has a molecular mass of 14592 Da including two iron atoms. The absorption, visible CD, and EPR spectra of the fragment are indistinguishable from those of the membrane-bound iron-sulfur protein. The redox potential as determined by EPR-monitored redox titration was + 306 mV. The far-ultraviolet CD spectrum is indicative of a protein with little regular secondary structure, while significant alpha-helix content was detected in the membrane anchor of the complete iron-sulfur protein. The fragment could be crystallized using poly(ethylene glycol) 6000 as precipitant. Needle-shaped single crystals have been grown by the hanging-drop vapor diffusion technique. These crystals belong to the space group P21 and diffract well beyond 0.2 nm resolution. Phase determination using the multiple-wavelength anomalous-scattering technique is underway.
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