Expression ofs , the gene product of rpoS, is controlled translationally in response to many environmental stresses. DsrA, a small 87-nucleotide non-coding RNA molecule, acts to increase translational efficiency of RpoS mRNA under some growth conditions. In this work, we demonstrate that DsrA binds directly to the 30 S ribosomal subunit with an observed equilibrium affinity of 2.8 ؋
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