Retinol dehydrogenase with a clear preference for NADP. Oxidizes all-trans-retinol, but seems to reduce all-trans-retinal with much higher efficiency . Has no activity toward steroids .
Subcellular locations: Mitochondrion inner membrane
Localized on the outer side of the inner mitochondrial membrane.
Widely expressed . In the retina, detected in the inner segment of the photoreceptor cells. Weak signals are observed in a small population of inner nuclear neurons and the inner plexiform layer .