Abstract
Naturally grown Beggiatoa filaments, occurring in massive near-mono-cultures at a “black smoker” wall of the Guaymas Basin hydrothermal vent site, were harvested and used for the analysis of their cytochromes. The cytochromes have been characterized by gel permeation chromatography, optical spectroscopy and redox potentiometry. Only c-type cytochromes were detected; a small, high potential cytochrome c that seems typical of its class, and a large complex (Mr 210,000) containing at least four thermodynamically distinct c-type hemes, which was partially dissociated by chromatography on DEAE-Sepharose. The hemes of the large complex have appropriate oxidation-reduction midpoint potentials (Em7 +240 mV, +15 mV,-160 mV,-340 mV) to be involved in the metabolism of sulfide, which is presumed to be the source of reductant for this organism.
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