Rhodopsin → Opsin + Trans-Retinal
Causes sodium channels to open
Causes sodium channels to close ...
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.
rhodopsin A visual pigment contained in the rods of the retina in the eye..
Rhodopsin kinase An enzyme that phosphorylates activated rhodopsin at multiple serine and threonine residues to provide a binding site for the inhibitory protein arrestin.
Rhodopsin consists of an opsin of 348 amino acids coupled to retinal.
The opsin has 7 segments of alpha helix that pass back and forth through the lipid bilayer of the disk membrane.
rhodopsin Light-sensitive substance that occurs in the rods of the retina; visual purple.
rhombogen Stage in the life cycle of a dicyemid mesozoan.
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 ...
Bacteriorhodopsin-like proteins including rhodopsin (see also opsin)[17]
Bacterial photosynthetic reaction centres and photosystems I and II [18]
Light harvesting complexes from bacteria and chloroplasts [19]
Oxidoreduction-driven transporters ...
(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.
Light reaching a photoreceptor causes the breakdown of the chemical rhodopsin, which in turn causes a membrane potential that is transmitted to an action potential. The action potential transfers to synapsed neurons that connect to the optic nerve.
The retina is soft, semitransparent, and of a purple tint in the fresh state, owing to the presence of a coloring material named rhodopsin or visual purple; but it soon becomes clouded, opaque, and bleached when exposed to sunlight.
Together they form rhodopsin, a very important molecule in vision. The RDA (recommended daily amount) is a minimal dose below which you will have symptoms associated with a deficiency of that vitamin.
 See also: Membrane, Cell, Protein, Trans, Organ
  
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