metarhodopsin

metarhodopsin
A light-activated form of rhodopsin; m. I is formed from lumirhodopsin and is converted to m. II; m. II is the form of rhodopsin that releases all-trans-retinal.

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meta·rho·dop·sin -rō-'däp-sən n either of two intermediate compounds formed in the bleaching of rhodopsin by light

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meta·rho·dop·sin (met″ə-ro-dopґsin) a transient intermediate produced upon irradiation of rhodopsin in the visual cycle and existing in two forms, metarhodopsins I and II. The latter dissociates to form opsin and all-trans retinal. See illustration at visual cycle, under cycle.

Medical dictionary. 2011.

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