Abstract
Retinol dehydrogenase activity in subcellular fractions obtained from bovine pigment epithelium was attributable to two particulate oxidoreductases. One of these enzymes, all- trans retinol dehydrogenase, was present in the rod outer segment discs undergoing digestion in the phagolysosomes, and probably does not normally interconvert retinal and retinol in the pigment epithelium. The other enzyme, 11- cis retinol dehydrogenase, was present in the light membrane fractions, and probably functions (by its retinaldehyde reductase activity) to return the chromophore of rhodopsin, 11- cis retinal, to the ocular pool of vitamin A compounds.
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