(S)-usnate reductase

In enzymology, a ("S")-usnate reductase () is an enzyme that catalyzes the chemical reaction
In the reverse direction, ("S")-usnate is reduced by NADH with cleavage of the ether bond to form a 7-hydroxy group.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD or NADP as acceptor. The systematic name of this enzyme class is reduced-("S")-usnate:NAD oxidoreductase (ether-bond-forming). This enzyme is also called L-usnic acid dehydrogenase.