Abstract
The exciting field of retinal proteins has been enlarged by the discovery of a photoreceptor mediating phototaxis in the unicellular eukaryote Chlamydomonas. The chromophore is 1 1-cis retinal, and the action spectrum suggests that it is bound to the protein via a protonated Schiff base (SB). Based on this discovery, new insights into the understanding of the mechanism of rhodopsin-like photoreceptors can be expected. It may even contribute to an understanding of how photoreceptors developed. It is typical of retinal proteins that they have greatly influenced other fields of scientific research ranging from molecular biology to theoretical physics. The great progress made during the last 15 years in the understanding of these systems and their photochromic behavior has been largely due to the development of new techniques and the influence of the different scientific fields upon each other.
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