PMID: 11916406Mar 28, 2002Paper

Characterization of an RNA active site: interactions between a Diels-Alderase ribozyme and its substrates and products

Journal of the American Chemical Society
Friedrich Stuhlmann, Andres Jäschke

Abstract

Ribozymes have recently been shown to catalyze the stereoselective formation of carbon-carbon bonds between small organic molecules. The interactions of these Diels-Alderase ribozymes with their substrates and products have now been elucidated by chemical substitution analysis by using 44 different, systematically varied analogues. RNA-diene interaction is governed by stacking interactions, while hydrogen bonding and metal ion coordination appear to be less important. The diene has to be an anthracene derivative, and substituents at defined positions are permitted, thereby shedding light on the geometry of the binding site. The dienophile must be a five-membered maleimidyl ring with an unsubstituted reactive double bond, and a hydrophobic side chain makes a major contribution to RNA binding. The ribozyme distinguishes between different enantiomers of chiral substrates and accelerates cycloadditions with both enantio- and diastereoselectivity. The stereochemistry of the reaction is controlled by RNA-diene interactions. The RNA interacts strongly and stereoselectively with the cycloaddition products, requiring several structural features to be present. Taken together, the results highlight the intricacy of ribozyme active sites w...Continue Reading

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