title: Cross-reaction of chalcone synthase and stilbene synthase overexpressed in Escherichia coli.
abstract: Chalcone synthase (CHS) and stilbene synthase (STS) are related plant polyketide synthases belonging to the CHS superfamily. CHS and STS catalyze common condensation reactions of p-coumaroyl-CoA and three C(2)-units from malonyl-CoA but different cyclization reactions to produce naringenin chalcone and resveratrol, respectively. Using purified Pueraria lobata CHS and Arachis hypogaea STS overexpressed in Escherichia coli, bisnoryangonin (BNY, the derailed lactone after two condensations) and p-coumaroyltriacetic acid lactone (the derailed lactone after three condensations) were detected from the reaction products. More importantly, we found a cross-reaction between CHS and STS, i.e. resveratrol production by CHS (2.7-4.2% of naringenin) and naringenin production by STS (1.4-2.3% of resveratrol), possibly due to the conformational flexibility of their active sites.
authors.affiliation: Faculty of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: F
authors.initials: F
authors.lastname: Kurosaki
authors.forename: D Y
authors.initials: DY
authors.lastname: Suh
authors.forename: U
authors.initials: U
authors.lastname: Sankawa
authors.forename: M
authors.initials: M
authors.lastname: Nishioka
authors.forename: T
authors.initials: T
authors.lastname: Akiyama
authors.forename: M
authors.initials: M
authors.lastname: Shibuya
authors.forename: Y
authors.initials: Y
authors.lastname: Ebizuka
mesh_terms: D000217:Acyltransferases / Q000096:biosynthesis* / Q000235:genetics* / Q000302:isolation & purification; D010367:Arachis / Q000201:enzymology; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics*; D007783:Lactones / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010940:Plant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification; D011753:Pyrones / Q000302:isolation & purification
chemical_list: D007783:Lactones; D010940:Plant Proteins; D011753:Pyrones; C000293:bisnoryangonin; D000217:Acyltransferases; C121200:p-coumaroyltriacetic acid synthase; C022674:stilbene synthase; C020141:flavanone synthetase