alexa Photoreceptors in Drosophila

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Photoreceptors in Drosophila

The photoreceptors in Drosophila express a variety of rhodopsin isoforms. The R1-R6 photoreceptor cells express Rhodopsin1 (Rh1), which absorbs blue light (480 nm). The R7 and R8 cells express a combination of either Rh3 or Rh4, which absorb UV light (345 nm and 375 nm), and Rh5 or Rh6, which absorb blue (437 nm) and green (508 nm) light respectively. Photo transduction in Drosophila microvillar photoreceptor cells is mediated by a G protein–activated phospholipase C (PLC). PLC hydrolyzes the minor membrane lipid phosphatidylinositol 4, 5-bisphosphate (PIP2), leading by an unknown mechanism to activation of the prototypical transient receptor potential (TRP) and TRP-like (TRPL) channels.

 

 
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