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