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Rhodopsin


rhodopsin: a light-sensitive pigment of the eye that functions in the detection of light.
ribonucleic acid: see RNA.
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Rhodopsin is the light-absorbing pigment of the rods. It is incorporated in the membranes of disks that are neatly stacked (some 2000 of them) in the outer portion of the rod.
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rhodopsin
[Gk. rhizoma, mass of roots]
A visual pigment consisting of retinal and opsin. When rhodopsin absorbs light, the retinal changes shape and dissociates from the opsin, after which it is converted back to its original form.
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rhodopsin A visual pigment contained in the rods of the retina in the eye..
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rhodopsin Light-sensitive substance that occurs in the rods of the retina; visual purple.
rhombogen Stage in the life cycle of a dicyemid mesozoan.
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Bacteriorhodopsin is a photosynthetic pigment used by archaea, most notably halobacteria.
See also:
transmembrane ATPase
active transport
cytochrome
mitochondrion
chloroplast
electron transfer chain
proton pump inhibitor
ATP synthase ...
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(I've recently stumbled onto a reference that claims that vertebrate rhodopsin and bacteriorhodopsin are not part of the same gene family. I'll reserve judgement until I've read more than just the abstract of the paper.
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Rod cells contain the protein rhodopsin and cone cells contain different proteins for each colour-range.
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The photoreceptors in Drosophila express a variety of rhodopsin isoforms. The R1-R6 photoreceptor cells express Rhodopsin1 (Rh1) which has absorbs blue light (480 nm).
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We have exploited this knowledge to develop efficient in vitro lipid-bilayer folding systems for the membrane protein, bacteriorhodopsin.
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