Which vitamin is also known as Retinol or Retinal?
Retinal retinal, retinal is the precursor of the other forms of vitamin A. Retinal is interconvertible with retinol (ROL), the transport and storage form of vitamin A catalyzed by retinol dehydrogenases (RDHs) and alcohol dehydrogenases (ADHs). Retinol is called vitamin A alcohol, or more often, simply vitamin A. Retinal can also be oxidized to retinoic acid (RA) catalyzed by retinal dehydrogenases also known as retinaldehyde dehydrogenases (RALDHs) as well as retinal oxidases. Retinoic acid, sometimes called vitamin A acid, is an important signaling molecule and hormone in vertebrate animals. Vision begins with the photoisomerization of retinal. When the 11-"cis"-retinal chromophore absorbs
Retinol dehydrogenase specifically those acting on the CH-OH group of donor with NAD or NADP as acceptor. The systematic name of this enzyme class is retinol:NAD oxidoreductase. Other names in common use include retinol (vitamin A1) dehydrogenase, MDR, microsomal retinol dehydrogenase, all-trans retinol dehydrogenase, retinal reductase, and retinene reductase. This enzyme participates in retinol metabolism. Occasionally, the literature refers to retinol dehydrogenase as an enzyme that oxidizes retinol in general, such as class IV alcohol dehydrogenase (ADH4), which reportedly is the most efficient retinol oxidation in the human alcohol dehydrogenase (ADH) family. As one of the most important RDH, 11-"cis"-retinol dehydrogenase catalyzes