Abstract
Abstract The stabilization energy for the secondary structures of wild-type hammerhead and mutant ribozymes has been calculated at different salt conditions and temperatures by using the thermodynamic parameters for RNA structure prediction. The most stable structure at each condition has been searched and the obtained secondary structure is compared with the structure suggested phylogenetically or experimentally. The results indicate that the hammerhead-type secondary structure of the ribozyme and its reactivity correlate with each other. The multibranched loop containing the self-cleavage site of the ribozyme particularly should be a key structure in the hammerhead ribozyme reaction. The predicted secondary structures also suggest that the reactivity of the hammerhead ribozyme should be very much lower at 10°C than that at 37°C.
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