## Abstract Light‐induced sodium extrusion from H halobium cell envelope vesicles proceeds largely through an uncoupler‐sensitive pathway involving bacteriorhodopsin and a proton/sodium antiporter. Vesicles from bacteriorhodopsin‐negative strains also extrude sodium ions during illumination, but th
Light-induced ion transport in Halobacterium halobium
✍ Scribed by Eisenbach, Michael; Caplan, S.Roy
- Book ID
- 123165067
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 529 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0968-0004
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## Abstract Halobacterium halobium carries out photophosphorylation. A rhodopsin‐like protein, bacteriorhodopsin, located in the cell membrane mediates the first step in energy transduction, the conversion of light energy into a chemiosmotic gradient. After absorption of a photon, bacteriorhodopsin
## Abstract Cell envelope vesicles prepared from H. halobium contain bacteriorhodopsin and upon illumination protons are ejected. Coupled to the proton motive force is the efflux of Na^+^. Measurements of ^22^Na flux, exterior pH change, and membrane potential, ΔΨ (with the dye 3,3′‐dipentyloxadica