Add time:08/16/2019         Source:sciencedirect.com

All-trans-retinoyl chloromethane is a potent irreversible inactivator of bovine opsin in retinal rod outer segments. The inactivation appears to be due to specific modification of the apoprotein at the 11-cis-retinaldehyde binding site. The reaction follows pseudo first order kinetics at 37°C. A moderate dissociation constant for the initial reversible complex of 6.1 mM could be derived with a first order rate constant of 1.8×10−1 min−1 for the conversion to the irreversible inactivated form. Native rhodopsin or rhodopsin regenerated from opsin by addition of 11-cis-retinaldehyde is completely protected against inactivation by trans-retinoyl chloromethane. All-trans-retinaldehyde does not provide this protection for the irreversible inactivation.

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