Evidence for an Enzyme-Catalyzed Rauhut–Currier Reaction during the Biosynthesis of Spinosyn A
作者:Sei-hyun Choi、Byungsun Jeon、Namho Kim、Hsin-Hui Wu、Tzu-Ping Ko、Mark W. Ruszczycky、Eta A. Isiorho、Yung-nan Liu、Adrian T. Keatinge-Clay、Ming-Daw Tsai、Hung-wen Liu
DOI:10.1021/jacs.1c09482
日期:2021.12.8
The catalog of enzymes known to catalyze the nucleophile-assisted formation of C–C bonds is extremely small, and there is presently no definitive example of a biological Rauhut-Currier reaction. Biosynthesis of the polyketide insecticide spinosyn A in Saccharopolyspora spinosa involves a [4 + 2]-cycloaddition and a subsequent intramolecular C–C bond formation catalyzed by SpnF and SpnL, respectively
Enzyme-catalysed [4+2] cycloaddition is a key step in the biosynthesis of spinosyn A
作者:Hak Joong Kim、Mark W. Ruszczycky、Sei-hyun Choi、Yung-nan Liu、Hung-wen Liu
DOI:10.1038/nature09981
日期:2011.5
insecticide from Saccharopolyspora spinosa, we identified a cyclase, SpnF, that catalyses a transannular [4+2] cycloaddition to form the cyclohexene ring in spinosyn A. Kinetic analysis demonstrates that SpnF specifically accelerates the ringformation reaction with an estimated 500-fold rate enhancement. A second enzyme, SpnL, was also identified as responsible for the final cross-bridging step that completes