Abstract
Chromatium vinosum chromatophores contain an energy-linked pyrophosphatase that is insensitive to oligomycin and dicyclohexylcarbodiimide. Pyrophosphate hydrolysis produces a carotenoid band-shift similar to that resulting from illumination. The carotenoid band-shift can also be produced by a K + diffusion potential (interior positive) and the magnitude of the band shift is proportional to the membrane potential over at least a 100-fold variation in K + concentration. The light-induced carotenoid band-shift in whole cells is identical to that seen in chromatophores but K + diffusion potentials (interior positive) produce a mirror image of the light-induced band-shift. These results are interpreted in terms of chromatophores being inside-out vesicles.
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