lumirhodopsin

[loo″mĭ-ro-dop´sin] an intermediate product of exposure of rhodopsin to light.

lu·mi·rho·dop·sin

(lū'mi-rō-dop'sin), An intermediate between rhodopsin and all-trans-retinal plus opsin during bleaching of rhodopsin by light; formed from bathorhodopsin and converted to metarhodopsin I with a half-life of about 20 μs. [L. lumen, light, + G. rhodon, rose, + opsis, vision]

lu·mi·rho·dop·sin

(lū'mi-rō-dop'sin) An intermediate between rhodopsin and all-trans-retinal plus opsin during bleaching of rhodopsin by light; formed from bathorhodopsin and converted to metarhodopsin. [L. lumen, light, + G. rhodon, rose, + opsis, vision]

rhodopsin

Visual pigment contained in the outer segments of the rod cells of the retina and involved in scotopic vision. When light stimulates the retina, the chromophore of the pigment molecule '11-cis' retinal (which is vitamin A aldehyde) isomerizes to 'all-trans' retinal. This leads to other chemical transformations which carry on even in the absence of light. The first stage is prelumirhodopsin, then lumirhodopsin and finally metarhodopsin (of which there are two types). This last transformation may lead to the breakdown of the molecule into retinal and opsin. The molecule is regenerated by recombining retinal and opsin with some enzymes. The absorption spectrum of rhodopsin has a maximum around 498 nm. The isomerization from '11-cis' to 'all-trans' also gives rise to the process of transduction in which the membrane potential covering the pigment molecules in the outer segment changes towards a hyperpolarization of the cell. This is the first step in the nervous response to a light stimulation of the retina. Syn. visual purple (not used any more); erythropsin. See dark adaptation; bleaching; receptor potential; absorption spectrum; transduction.

单词	lumirhodopsin
释义	DictionarySeerhodopsinEncyclopediaSeeRhodopsin lumirhodopsin lumirhodopsin [loo″mĭ-ro-dop´sin] an intermediate product of exposure of rhodopsin to light. lu·mi·rho·dop·sin (lū'mi-rō-dop'sin), An intermediate between rhodopsin and all-trans-retinal plus opsin during bleaching of rhodopsin by light; formed from bathorhodopsin and converted to metarhodopsin I with a half-life of about 20 μs. [L. lumen, light, + G. rhodon, rose, + opsis, vision] lu·mi·rho·dop·sin (lū'mi-rō-dop'sin) An intermediate between rhodopsin and all-trans-retinal plus opsin during bleaching of rhodopsin by light; formed from bathorhodopsin and converted to metarhodopsin. [L. lumen, light, + G. rhodon, rose, + opsis, vision] rhodopsin Visual pigment contained in the outer segments of the rod cells of the retina and involved in scotopic vision. When light stimulates the retina, the chromophore of the pigment molecule '11-cis' retinal (which is vitamin A aldehyde) isomerizes to 'all-trans' retinal. This leads to other chemical transformations which carry on even in the absence of light. The first stage is prelumirhodopsin, then lumirhodopsin and finally metarhodopsin (of which there are two types). This last transformation may lead to the breakdown of the molecule into retinal and opsin. The molecule is regenerated by recombining retinal and opsin with some enzymes. The absorption spectrum of rhodopsin has a maximum around 498 nm. The isomerization from '11-cis' to 'all-trans' also gives rise to the process of transduction in which the membrane potential covering the pigment molecules in the outer segment changes towards a hyperpolarization of the cell. This is the first step in the nervous response to a light stimulation of the retina. Syn. visual purple (not used any more); erythropsin. See dark adaptation; bleaching; receptor potential; absorption spectrum; transduction.
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