Transition of Rhodopsin into the Active Metarhodopsin II State Opens a New Light-induced Pathway Linked to Schiff Base Isomerization

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Signaling states of rhodopsin. Formation of the storage form, metarhodopsin III, from active metarhodopsin II.

Vertebrate rhodopsin consists of the apoprotein opsin and the chromophore 11-cis-retinal covalently linked via a protonated Schiff base. Upon photoisomerization of the chromophore to all-trans-retinal, the retinylidene linkage hydrolyzes, and all-trans-retinal dissociates from opsin. The pigment is eventually restored by recombining with enzymatically produced 11-cis-retinal. All-trans-retinal ...

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Signaling states of rhodopsin: absorption of light in active metarhodopsin II generates an all-trans-retinal bound inactive state.

Absorption of light in rhodopsin leads through 11-cis- and all-trans-retinal isomerization, proton transfers, and structural changes to the active G-protein binding meta-II state. When meta-II is photolysed by blue light absorption, the activating pathway is apparently reverted, and rhodopsin is photoregenerated. However, the product formed, a P subspecies with A(max) = 500 nm (P(500)), is diff...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 2004

ISSN: 0021-9258

DOI: 10.1074/jbc.m406857200