Retinal isomerase (EC 5.2.1.3) is an enzyme that catalyzes the isomerisation of all-trans-retinal in the eye into 11-cis-retinal which is the form that most opsins bind.
Hence, this enzyme has one substrate, all-trans-retinal, and one product, 11-cis-retinal.
Its systematic name is all-trans-retinal 11-cis-trans-isomerase.
This enzyme participates in the retinol metabolism.
This isomerase article is a stub.