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11-cis-retinaldehyde
chemical compound
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function in rod cells
- In rod
…chemical derived from vitamin A, 11-cis-retinaldehyde. Photons of light entering the eye cause the 11-cis-retinaldehyde to undergo isomerization (a change in configuration), forming all-trans-retinaldehyde. This isomerization activates the opsin protein, which then interacts with and activates a small protein called transducin. The association of opsin with transducin couples the external…
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human visual system
- In photoreception: Photopigments
…reconfiguring the molecule from the 11-cis to the all-trans form. This in turn triggers a molecular transduction cascade, resulting in the closure of sodium channels in the membrane and hyperpolarization (increase in negativity) of the cell. Retinal then detaches from opsin, is regenerated to the 11-cis state in the cells…
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