all-trans-retinyl-ester hydrolase, 11-cis retinol forming activity

Definition

Target type: molecularfunction

Catalysis of the reaction: H2O + all-trans-retinyl ester = 11-cis-retinol + fatty acid. [RHEA:31771]

All-trans-retinyl-ester hydrolase, 11-cis retinol forming activity, is a crucial enzyme in the visual cycle, responsible for the regeneration of 11-cis retinal, the light-absorbing chromophore of rhodopsin. This enzyme catalyzes the hydrolysis of all-trans-retinyl esters, primarily all-trans-retinyl palmitate, to release all-trans-retinol. All-trans-retinol is then isomerized to 11-cis-retinol by an isomerase enzyme. Finally, 11-cis-retinol is oxidized to 11-cis-retinal, which binds to opsin to regenerate rhodopsin. This entire process is essential for light perception and vision. The molecular function of this enzyme involves:

1. **Binding of all-trans-retinyl esters:** The enzyme binds to all-trans-retinyl esters, typically all-trans-retinyl palmitate, in its active site.
2. **Hydrolysis of the ester bond:** The enzyme utilizes a catalytic mechanism to hydrolyze the ester bond, releasing all-trans-retinol and a fatty acid, typically palmitic acid.
3. **Release of all-trans-retinol:** The enzyme releases all-trans-retinol from its active site, making it available for isomerization.

This enzymatic activity is critical for maintaining the visual cycle and ensuring proper light perception.'
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Proteins (2)

Compounds (2)