A purplish-red thermolabile protein, MW about 40,000, found in the external segments of the rods of the retina; it is bleached by the action of light, which converts it to opsin and all-trans-retinal, and is restored in the dark by rhodogenesis; the dominant protein in the plasma membrane of rod cells. SYN: visual purple.
- r. kinase an enzyme that regulates r. function by phosphorylating activated r. at a number of sites; phosphorylated photoactivated r. binds to arrestin.

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rho·dop·sin rō-'däp-sən n a red photosensitive pigment in the retinal rods of marine fishes and most higher vertebrates that is important in vision in dim light, is quickly bleached by light to a mixture of opsin and retinal, and is regenerated in the dark called also visual purple

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a pigment in the retina of the eye, within the rod, consisting of retinal - an aldehyde of retinol (vitamin A) - and a protein. The presence of rhodopsin is essential for vision in dim light. It is bleached in the presence of light and this stimulates nervous activity in the rods.

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rho·dop·sin (ro-dopґsin) [rhodo- + opsin] visual purple: a photosensitive purple-red chromoprotein in the retinal rods that is bleached and activated by light, producing stimulation of the retinal sensory endings as it is formed and degraded in the visual cycle (see illustration under cycle). It is a conjugated protein containing an 11-cis retinal prosthetic group linked to opsin.

Medical dictionary. 2011.

Look at other dictionaries:

  • Rhodopsin — Rhodopsin, also known as visual purple, is a pigment of the retina that is responsible for both the formation of the photoreceptor cells and the first events in the perception of light. Rhodopsins belong to the G protein coupled receptor family… …   Wikipedia

  • Rhodopsin — Dreidimensionales Strukturmodell des Backbones von Rhodopsin. In der …   Deutsch Wikipedia

  • Rhodopsin — Rho*dop sin, n. [Gr. ro don rose + w ps eye.] (Physiol.) The visual purple. See under {Visual}. [1913 Webster] …   The Collaborative International Dictionary of English

  • rhodopsin — rhodopsin. См. родопсин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Rhodopsin — Rhodopsīn, s. Sehpurpur …   Kleines Konversations-Lexikon

  • Rhodopsin — Rhodopsin, Sehpurpur, in den Stäbchen der Wirbeltiere und in den Lichtsinneszellen verschiedener Wirbelloser nachgewiesener ⇒ Sehfarbstoff. R. ist ein Chromoprotein, das aus dem Protein Opsin und dem Aldehyd des Retinols, dem Retinal, besteht.… …   Deutsch wörterbuch der biologie

  • Rhodopsin — vgl. Sehpurpur …   Das Wörterbuch medizinischer Fachausdrücke

  • rhodopsin — [rō däp′sin] n. [< Gr rhodon, a rose (see RHODA) + opsis, sight (see OPSIS) + IN1] a purplish, photosensitive protein pigment that is essential for vision in dim light, found in the rods of the retina: also called visual purple: see OPSIN …   English World dictionary

  • rhodopsin — /roh dop sin/, n. Biochem. a bright red photosensitive pigment found in the rod shaped cells of the retina of certain fishes and most higher vertebrates: it is broken down by the action of dim light into retinal and opsin. Also called visual… …   Universalium

  • Rhodopsin — Rho|d|op|sin [↑ rhod u. ↑ Opsin], das; s, e; Syn.: Sehpurpur: ein tiefrotes lichtempfindliches Chromoprotein (MG 28 600) mit 348 Aminosäuren) mit 11 cis Retinal als prosthetischer Gruppe, die nach Art einer Schiff Base an einen Lysinrest des… …   Universal-Lexikon

  • rhodopsin — Visual Vis u*al, a. [L. visualis, from visus a seeing, sight: cf. F. visuel. See {Vision}.] 1. Of or pertaining to sight; used in sight; serving as the instrument of seeing; as, the visual nerve. [1913 Webster] The air, Nowhere so clear,… …   The Collaborative International Dictionary of English

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