The Journal of General Physiology
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The Journal of General Physiology, Vol 90, 575-586, Copyright © 1987 by The Rockefeller University Press

ARTICLES

Nontransducing rhodopsin

E Levine, E Crain, P Robinson and J Lisman
Department of Biology, Brandeis University, Waltham, Massachusetts 02254.

Rhodopsin is converted by light to an active photoproduct that triggers the transduction cascade. The active photoproduct must then be inactivated by some kind of chemical modification. The question addressed here is whether photoconversion of the inactive photoproduct to rhodopsin creates a modified form of rhodopsin that is unable to support transduction. This question was investigated in ultraviolet receptors of Limulus median eye by measuring the relative quantum efficiency of excitation after photoregeneration of rhodopsin from the inactive photoproduct. The results show that when this newly created rhodopsin absorbs a photon, no receptor potential is generated; i.e., the pigment is nontransducing. A dark process requiring 30-60 min returns rhodopsin to its transducing form.
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A Kiselev and S Subramaniam
Activation and regeneration of rhodopsin in the insect visual cycle
Science, November 25, 1994; 266(5189): 1369 - 1373.
[Abstract] [PDF]


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