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The hairpin ribozyme is a small Mg2+-dependent catalytic RNA molecule able to catalyze the trans-cleavage of an RNA substrate via a reversible trans-esterification mechanism. In this study, the cleavage activities of several fragmented hairpin ribozyme systems were examined. Due to the complex catalytic structure of the hairpin ribozyme, a new boronic acid ester was used as a covalent linkage to hold the folding of the functional system. It has been demonstrated the possibility of replacing the phosphodiester linkage, at specific positions, with a boronic acid ester to restore or improve the catalytic activity of fragmented hairpin ribozyme.