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Mössbauer effect and electron paramagnetic resonance (EPR) were measured for yeast aconitase [EC 4.2.1.3] purified from the cells of Candida lipolytica (ATCC 200114). Mössbauer spectra suggested that yeast aconitase nostly contained two high-spin Fe(III) ions in an antiferromagnetically coupled binuclear complex that resembled oxidized 2 Fe ferredoxins, together with a small amount of high-spin Fe(II). EPR spectra recorded no signal at 77degreesK, but showed a slightly asymmetric signal centered at g=2.0 at 4.2degreesK, presumably due to the small amount of Fe(II) Fe(III) pairs.
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