Abstract
We identified a short RNA fragment, complementary to the Escherichia coli 23S rRNA segment comprising nucleotides 735 to 766 (in domain II), which when expressed in vivo results in the suppression of UGA nonsense mutations in two reporter genes. Neither UAA nor UAG mutations, examined at the same codon positions, were suppressed by the expression of this antisense rRNA fragment. Our results suggest that a stable phylogenetically conserved hairpin at nucleotides 736 to 760 in 23S rRNA, which is situated close to the peptidyl transferase center, may participate in one or more specific interactions during peptide chain termination.
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