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NifA is the general transcriptional activator of nitrogen fixation genes in diazotrophic bacteria. In Rhizobium leguminosarum bv. viciae strain 8401/pRL1JI, the NifA gene is part of a gene cluster (fixABCXNifAB). In this study, results showed that in R. leguminosarum bv.viciae 8401/pRL1JI, host factor required (Hfq), and RNase E were involved in the post-transcriptional regulation of NifA expression. It was found that Hfq-dependent RNase E cleavage of NifA mRNA was essential for NifA translation. The cleavage site is located at 32 nucleotides upstream of the NifA translational start codon. A possible explanation based on predicted RNA secondary structure of the NifA 5'-untranslated region was that the cleavage made ribosome-binding sites accessible for translation.

acta biochimica et biophysica sinica

Post-transcriptional regulation of &amp;lt;italic&amp;gt;NifA&amp;lt;/italic&amp;gt; expression by Hfq and RNase E complex in &amp;lt;italic&amp;gt;Rhizobium leguminosarum&amp;lt;/italic&amp;gt; bv. &amp;lt;italic&amp;gt;viciae&amp;lt;/italic&amp;gt;