Rhodopsin 7 (Rh7), a new invertebrate Rhodopsin gene, was discovered in the genome of Drosophila melanogaster in 2000 and thought to encode for a functional Rhodopsin protein. Indeed, Rh7 exhibits most hallmarks of the known Rhodopsins, except for the G-protein-activating QAKK motif in the third cytoplasmic loop that is absent in Rh7. Here, we show that Rh7 can partially substitute Rh1 in the outer receptor cells (R1-6) for rhabdomere maintenance, but that it cannot activate the phototransduction cascade in these cells. This speaks against a role of Rh7 as photopigment in R1-6, but does not exclude that it works in the inner photoreceptor cells.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5537319 | PMC |
| http://dx.doi.org/10.1007/s00359-017-1182-8 | DOI Listing |
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