Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti

Torres-Quesada O, Reinkensmeier J, Schlueter J-P, Robledo M, Peregrina A, Giegerich R, Toro N, Becker A, Jimenez-Zurdo JI (2014)
RNA Biology 11(5): 563-579.

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Abstract / Bemerkung
The RNA chaperone Hfq is a global post-transcriptional regulator in bacteria. Here, we used RNAseq to analyze RNA populations from the legume symbiont Sinorhizobium meliloti that were co-immunoprecipitated (CoIP-RNA) with a FLAG-tagged Hfq in five growth/stress conditions. Hfq-bound transcripts (1315) were largely identified in stressed bacteria and derived from small RNAs (sRNAs), both trans-encoded (6.4%) and antisense (asRNAs; 6.3%), and mRNAs (86%). Pull-down with Hfq recovered a small proportion of annotated S. meliloti sRNAs (14% of trans-sRNAs and 2% of asRNAs) suggesting a discrete impact of this protein in sRNA pathways. Nonetheless, Hfq selectively stabilized CoIP-enriched sRNAs, anticipating that these interactions are functionally significant. Transcription of 26 Hfq-bound sRNAs was predicted to occur from promoters recognized by the major stress s factors sigma(E2) or sigma(H1/2). Recovery rates of sRNAs in each of the CoIP-RNA libraries suggest a large impact of Hfq-assisted riboregulation in S. meliloti osmoadaptation. Hfq directly targeted 18% of the predicted S. meliloti mRNAs, which encode functionally diverse proteins involved in transport and metabolism, sigma(E2)-dependent stress responses, quorum sensing, flagella biosynthesis, ribosome, and membrane assembly or symbiotic nitrogen fixation. Canonical targeting of the 5' regions of two of the ABC transporter mRNAs by the homologous Hfq-binding AbcR1 and AbcR2 sRNAs leading to inhibition of protein synthesis was confirmed in vivo. We therefore provide a comprehensive resource for the systems-level deciphering of hitherto unexplored S. meliloti stress and symbiotic post-transcriptional regulons and the identification of Hfq-dependent sRNA-mRNA regulatory pairs.
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RNA Biology
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11
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5
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563-579
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Torres-Quesada O, Reinkensmeier J, Schlueter J-P, et al. Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti. RNA Biology. 2014;11(5):563-579.
Torres-Quesada, O., Reinkensmeier, J., Schlueter, J. - P., Robledo, M., Peregrina, A., Giegerich, R., Toro, N., et al. (2014). Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti. RNA Biology, 11(5), 563-579. doi:10.4161/rna.28239
Torres-Quesada, O., Reinkensmeier, J., Schlueter, J. - P., Robledo, M., Peregrina, A., Giegerich, R., Toro, N., Becker, A., and Jimenez-Zurdo, J. I. (2014). Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti. RNA Biology 11, 563-579.
Torres-Quesada, O., et al., 2014. Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti. RNA Biology, 11(5), p 563-579.
O. Torres-Quesada, et al., “Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti”, RNA Biology, vol. 11, 2014, pp. 563-579.
Torres-Quesada, O., Reinkensmeier, J., Schlueter, J.-P., Robledo, M., Peregrina, A., Giegerich, R., Toro, N., Becker, A., Jimenez-Zurdo, J.I.: Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti. RNA Biology. 11, 563-579 (2014).
Torres-Quesada, Omar, Reinkensmeier, Jan, Schlueter, Jan-Philip, Robledo, Marta, Peregrina, Alexandra, Giegerich, Robert, Toro, Nicolas, Becker, Anke, and Jimenez-Zurdo, Jose I. “Genome-wide profiling of Hfq-binding RNAs uncovers extensive post-transcriptional rewiring of major stress response and symbiotic regulons in Sinorhizobium meliloti”. RNA Biology 11.5 (2014): 563-579.

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