Retina rod-cell proteins {rhodopsin}| can absorb light and bind GTP to transducin, which activates phosphodiesterase, which breaks down cGMP, which closes cGMP-dependent ion channels and so causes hyperpolarization. Rhodopsin is similar to adrenergic receptor. Opsin proteins are similar to rhodopsin, because both use 11-cis-retinal as chromophore. Absorption maximum differs for opsins and rhodopsin.
Biological Sciences>Genetics>Gene>Cell Surface Receptor>Binding
4-Genetics-Gene-Cell Surface Receptor-Binding
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Date Modified: 2022.0224