Exchange integral for a variety of tetranuclear ferredoxins.
Biochim Biophys Acta, 1979/10/10;548(1):139-46.
Blum H, Salerno JC, Rich PR, Ohnishi T
PMID: 226131
Abstract
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), ferrodoxins was associated with higher energy differences. Center N-2, a [Fe-4S](-2,-3) iron-sulfur cluster does not fit this relationship.
MeSH terms
Animals; Cattle; Electron Spin Resonance Spectroscopy; Ferredoxins; Iron-Sulfur Proteins; Myocardium; Oxidation-Reduction; Protein Conformation; Temperature; Thermus
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