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The Journal of Cell Biology, Vol 79, 657-662, Copyright © 1978 by The Rockefeller University Press

ARTICLES

Bacteriorhodopsin induces a light-scattering change in Halobacterium halobium

CL Wey, PL Ahl and RA Cone

When suspensions of Halobacterium halobium are exposed to bright light, the light-scattering properties of the bacteria change. This light- scattering response can produce a transmission decrease of about 1% throughout the red and near-infrared region. The action spectrum for the light-scattering response appropriately matches the absorption spectrum of bacteriorhodopsin. The response is eliminated by cyanide p- trifluoro-methoxyphenylhydrazone, a proton ionophore, and by triphenylmethylphosphonium, a membrane permanent cation. A mild hypertonic shock induces a similar light-scattering change, suggesting that bright light causes the bacteria to shrink about 1% in volume, thereby producing the light-scattering response.
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