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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The presence of the iron-sulfur protein (subunit V) of complex III in mitochondria of heme-deficient yeast cells lacking iron-sulfur clusters detectable by electron paramagnetic resonance.

The presence of subunit V, the iron-sulfur protein, of complex III has been demonstrated in mitochondria from a mutant of Saccharomyces cerevisiae which lacks 5-aminolevulinic acid synthase and, hence, is devoid of heme. The mature form (24 K Da) of the iron-sulfur protein was observed in equal amounts in the heme-deficient and heme-sufficient cells with antiserum against subunit V and either the sensitive immuno-transfer technique or immunoprecipitation from dodecylsulfate-solubilized mitochondria. In addition, a slight shoulder with a molecular mass 1.5 kDa larger than the mature form was present in mitochondria from the heme-deficient cells. Electron paramagnetic resonance spectroscopy revealed the absence of iron-sulfur signals due to clusters S-1, S-2 and S-3 of succinate dehydrogenase or to Rieske's iron-sulfur cluster of complex III in mitochondria from the heme-deficient cells. The lack of iron-sulfur centers in these cells may be a consequence of the absence of sulfite reductase in the cells without heme.[1]


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