EXCHANGE INTEGRAL FOR A VARIETY OF TETRANUCLEAR FERREDOXINS

被引：17

作者：

BLUM, H

SALERNO, JC

RICH, PR

OHNISHI, T

机构：

[1] Johnson Research Foundation, Department of Biochemistry and Biophysics, School of Medicine, Philadelphia

来源：

BIOCHIMICA ET BIOPHYSICA ACTA | 1979年 / 548卷 / 01期

基金：

美国国家科学基金会;

关键词：

(ESR); Antiferromagnetic exchange; Ferredoxin; Iron-sulfur protein; Tetranuclear ferredoxins;

D O I：

10.1016/0005-2728(79)90194-4

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The temperature dependence of EPR spectra of oxidized [4Fe-4S*](-1, -2) ferredoxins (previously designated HiPIP) and a reduced [4Fe-4S*](-2,-3) ferredoxin have been analyzed so as to determine the energy of a low-lying excited electronic state. The values obtained were: Center S-3 from beef heart, 44 cm-1; Center S-3 from mung bean, 53 cm-1; the [4Fe-4S*](-1,-2) ferredoxin from Thermus thermophilus, 78 cm-1; Center N-2 of NADH ubiquinone reductase, 83 cm-1. Increasing axial distortion in the EPR spectra of the [4Fe-4S*](-1,-2) ferredoxins was associated with higher energy differences. Center N-2, a [4Fe-4S*](-2,-3) iron-sulfur cluster does not fit this relationship. © 1979.

引用

页码：139 / 146

页数：8

共 20 条

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