Photoisomerization of rhodopsin

3.4.1 Classical photoisomerization pathway The UV Vis photointermediates of rhodopsin may be arranged in a (simplified) reaction scheme, which includes the approximate lifetime at room temperature and absorption maxima (in nm) ps ns ns (xs ms min R (498) B (540) BSI (477) L (497) MI (478) Mil (380) Mill (465) After illumination of rhodopsin (R), bathorhodopsin (B) is trapped below -140 C. Lumirhodopsin (L) is obtained by warming above this temperature, and metarhodopsin I (MI) begins to form...

Key motifs of invertebrate rhodopsins

A detailed structure comparison of invertebrate rhodopsins has recently been performed by G rtner 14 . To highlight some of the key motifs for rhodopsin function in the following chapters of this review, a coding sequence comparison is carried out for Drosophila melanogaster. This is the only insect species in which six out of seven expressed opsins genes rhl to rh6 have not only been sequenced, but the corresponding rhodopsins have been functionally characterized as well 35 -1 . The Drosophila...