(S)-usnate reductase

In enzymology, (S)-usnate reductase (EC 1.1.1.199) is an enzyme that catalyzes the chemical reaction

(S)-usnic acid precursor

+ NAD⁺

 

 

 

H⁺

 

H⁺

 

(S)-usnic acid

+ NADH

 

(S)-usnate reductase
Identifiers
EC no.	1.1.1.199
CAS no.	77237-99-1
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / QuickGO
Search PMC articles PubMed articles NCBI proteins

The enzyme converts the precursor (6R)-2-acetyl-6-(3-acetyl-2,4,6-trihydroxy-5-methylphenyl)-3-hydroxy-6-methylcyclohexa-2,4-dien-1-one into (S)-usnic acid using oxidised nicotinamide adenine dinucleotide (NAD⁺) as cofactor and forming an ether bond.^[1][2]

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.