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| Description: 11-cis-retinal and opsin in a rod cell combine to form rhodopsin. Absorption of a photon of light leads to the chemical changes shown in steps 2 and 3. Step 3 involves at least 3 distinct conformational changes that occur in ~1 ms. Metarhodopsin II is the species that activates transducin (not shown) to initiate the visual cascade. After about 1 second, metarhodopsin II dissociates into all-trans-retinal, which isomerizes as the cycle begins again. Picture Stats: Views: 246 Filesize: 79.9kB Height: 537 Width: 654 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34718 |