Abstract
Chloride uptake in intact cells of Halobacterium halobium was characterized by rates of influx and efflux of 36Cl- under conditions of light, respiration, or both. Halobacterial mutant strains with and without retinal transport proteins allowed study of the effects of halorhodopsin and bacteriorhodopsin under illumination. Two structurally independent chloride transport systems could be distinguished: halorhodopsin, the already known light-driven chloride pump, and a newly described secondary uptake system, which was energized by respiration or by light via bacteriorhodopsin.
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