Abstract
trans-Cleaving hammerhead ribozyme variants were generated with mimicked non-conserved internal loop motifs derived from five structurally diverse natural cis-cleaving ribozymes. Most modified trans-cleaving variants showed enhanced single-turnover cleavage rates relative to minimal counterparts that lack tertiary interactions between internal loop motifs I and II, and relative to controls with sequence changes in loop I. The trans-cleaving ribozyme derived from the positive strand of peach latent mosaic viroid had the highest observed cleavage rate, suggesting a structurally optimized motif that facilitates rapid formation of the ribozyme catalytic center in a trans-reaction.
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