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An Integrated Affinity Chromatography-Based Approach to Unravel the sRNA Interactome in Nitrogen-Fixing Rhizobia.
The activity mechanism and function of bacterial base-pairing small non-coding RNA regulators (sRNAs) are largely shaped by their main interacting cellular partners, i.e., proteins and mRNAs. We describe here an MS2 affinity chromatography-based procedure adapted to unravel the sRNA interactome in nitrogen-fixing legume endosymbiotic bacteria. The method consists of tagging of the bait sRNA at its 5'-end with the MS2 aptamer followed by pulse overexpression and immobilization of the chimeric transcript from cell lysates by an MS2-MBP fusion protein conjugated to an amylose resin. The sRNA-binding proteins and target mRNAs are further profiled by mass spectrometry and RNAseq, respectively.
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