Abstract
MicroRNAs are potential targets for drug development. Small molecules that can inhibit or promote a specific miRNA's biogenesis would be useful for regulating its target genes. Various types of small molecules have been investigated so far for their potential application in modulating miRNA biogenesis. They bind to the target primary or precursor miRNAs and inhibit the processing of these precursors by Drosha or Dicer. However, the binding site that effectively interferes with the Dicer cleavage reaction is still undetermined. Here we report that our designed small molecule restricted naphthyridine dimer (RND) binds to the hairpin loop of a hairpin RNA and induces its dimerization. This study shows that the binding of the RND to the hairpin loop was not effective in interfering with the Dicer cleavage reaction, but dimerization of the hairpin RNA by RND binding effectively interfered with the Dicer cleavage reaction.
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