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  • Title: The orientation of iron-sulfur clusters and a spin-coupled ubiquinone pair in the mitochondrial membrane.
    Author: Salerno JC, Blum H, Ohnishi T.
    Journal: Biochim Biophys Acta; 1979 Aug 14; 547(2):270-81. PubMed ID: 223637.
    Abstract:
    Oriented multilayers made from beef heart and yeast mitochondria and submitochondrial particles were studied using electron paramagnetic resonance. EPR signals from membrane-bound iron-sulfur clusters and from a spin-coupled ubiquinone pair are highly orientation dependent, implying that these redox centers are fixed in the membrane at definite angles relative to the membrane plane. Typically the iron-iron axis (gz) of the binuclear iron-sulfur clusters is in the membrane plane. This finding is discussed in terms of the protein structure. The tetranuclear iron-sulfur clusters can have their gz axis either perpendicular or parallel to the membrane plane, but intermediate orientation was not observed.
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