Abstract
Numerous ultrastructural studies are dealing with the problem of membrane turnover in invertebrate photoreceptors, with special attention to changes in the structure of the rhabdom, rhabdomeres, and microvilli and to other cytological changes within the cell. Both synthesis and degradation of photoreceptor membrane involve the formation of sequences of as yet poorly defined organelles. The underlying mechanisms are not understood. Even the microvillar cytoskeleton may, amongst other functions, play an important role in both membrane assembly and degradation. The daily cycle of light and darkness sets off changes — in some species quite drastic — in the size of the rhabdom. Generally, the size of the rhabdom decreases in light and increases again in the dark, indicating an imbalance between the rates of membrane breakdown and synthesis and/or assembly. The possible mechanisms whereby membrane turnover is triggered by light or by darkness are still obscure. The diurnal effects may be modified by endogenous factors.
Relatively few studies, however, have dealt with the problem at a molecular level. Autoradiographic studies using labeled amino acids demonstrated a random distribution of the label in the rhabdomeric membrane. Although in most cases the labeled proteins were not identified, it is assumed that the bulk of proteins labeled is the visual pigment. The general observation that more label was associated with the rhabdom in the dark than in the light was taken as an indication that the breakdown of rhabdomeric proteins was more rapid in the light than in the dark. Additional information on the turnover of visual pigment has come from quantification of rhodopsin and metarhodopsin by spectrophotometry. Progress has been made by studies on blowfly photoreceptors, revealing a selective breakdown of metarhodopsin at a rate inversely proportional to the intensity of the ambient light. The other part of the visual pigment cycle, the biosynthesis of rhodopsin, has been shown to depend on the presence of the 11-cis chromophore, in other words, the all-trans isomer resulting from the degradation of metarhodopsin has first to be isomerized in order to induce the synthesis of rhodopsin. This isomerization, which occurs through a light reaction, plays a key role in the turnover of visual pigment in that it links its two aspects, the breakdown and the biosynthesis. The following is an attempt to show how ultrastructural findings can be related to the molecular events which underlie the turnover of rnabdomeric membrane and of the visual pigment.
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© 1986 Dr. S. Bernhard, Dahlem Konferenzen, Berlin
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Schwemer, J. (1986). Turnover of Photoreceptor Membrane and Visual Pigment in Invertebrates. In: Stieve, H. (eds) The Molecular Mechanism of Photoreception. Dahlem Workshop Reports, vol 34. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-70444-4_18
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