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The role of Hfq in regulation of lipA expression in Pseudomonas protegens Pf-5.

Scientific Reports 2017 September 5
Pseudomonas lipase is a well-studied lipase. However, few studies have been conducted to examine the mechanisms underlying the regulation of the lipase expression. Hfq is a global regulatory protein that, among others, controls the expression of multiple genes, regulate bacterial peristalsis, and participates in the regulation of quorum-sensing (QS) system. In this study, the effects of Hfq on lipase expression were investigated by knocking out the hfq and rsmY genes or overexpressing of hfq and rsmY genes. We found that Hfq regulates the expression of lipA at both transcriptional and translational levels. The translational level was the main regulatory level of lipA. Hfq also regulates the expression and stability of rsmY. Additionally, using hfq/rsmY double gene knock-out, we showed that Hfq can directly bind to the rsmY to regulate lipA activity. In conclusion, our results indicate that Hfq regulates the expression of rsmY mainly at the translational level to influence the expression of lipA in Pseudomonas protegens Pf-5.

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