Chalcone-flavanone isomerase is a plant enzyme responsible for the isomerisation of chalcone to naringenin, 4',5,7-trihydroxyflavanone, a key step in the biosynthesis of flavonoids.

1: Cloning of chalcone-flavanone isomerase cDNA from Pueraria lobata and its overexpression in Escherichia coli. Terai Y, Fujii I, Byun SH, Nakajima O, Hakamatsuka T, Ebizuka Y, Sankawa U; Protein Expr Purif 1996;8:183-190. PMID:8812858