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Two soluble acidic c-type cytochromes - c' and c-552 - were isolated by ion exchange :hromatography, gel filtration and ammonium sulfate fractionation. Cytochrome c' is a high-spir tochrome with maxima at 399 nm. 490 nm. and 634 nm in the oxidized form and at 550 nm. 15 nm and a characteristic shoulder at 434 nm in the reduced state. The best purity index obtained A 280 /A 399 ) was 0.35. Cytochrome c' is autoxidizable, has a molecular weight of 12 000 (estimate by sodium dodecylsulfate electrophoresis), a midpoint redoxpotential of + 10 mV and an iso­electric point at pH 4.0. The reduced cytochrome c' reacts with carbon monoxide. The reaction reversible. Cytochrome c-552 shows maxima at 552 nm, 523 nm and 417 nm in the reduced for ind at 408 nm in the oxidized state. The best purity index obtained (A 280 /A 408 ) was 0.94. "ytochrome c-552 has a molecular weight of 30 000 and an isoelectric point between pH 4.1 Zhromatium warmingii also contains a membrane-bound cytochrome c-552. During anaerobic sulfide oxidation, elemental sulfur and sulfate were formed at the same time. When all sulfide consumed by the cells, the remaining intracellular elemental sulfur was further oxidized to sulfate

Cytochromes and Anaerobic Sulfide Oxidation in the Purple Sulfur Bacterium Chromatium warmingii