Photoreactions of bacteriorhodopsin |
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| Authors: | Walther Stoeckenius Richard H Lozier Werner Niederberger |
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| Institution: | (1) Cardiovascular Research Institute and Department of Biochemistry and Biophysics, University of California, 94122 San Francisco, California;(2) NASA Ames Research Center, Moffett Field, California, USA |
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| Abstract: | Bacteriorhodopsin is a membrane-bound light energy transducer which generates an electrochemical proton gradient. It undergoes a cyclic photoreaction in which five intermediates have been identified. During the cycle it releases a proton from one surface of the membrane and takes up a proton on the opposite surface. The active chromophore consists of retinal bound through a Schiff base to the protein. The Schiff base is deprotonized during the photoreaction cycle and appears to be involved in the transport of protons through the membrane. The retinal may also undergo an isomerization.Presented at the EMBO-Workshop on Transduction Mechanism of Photoreceptors, Jülich, Germany, October 4–8, 1976This work was supported by NASA Grant NSG-7151 and NHLI Grant HL-06285 |
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| Keywords: | Light energy transduction Purple membrane Halobacteria Proton transport Spectroscopy |
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