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    Molecular cell (2)
    AuthorsVogel, Jörg (2)
    Vogel, Jörg (2)
    Chao, Yanjie (1)Corcoran, Colin (1)Förstner, Konrad U (1)View MoreYear (Issue Date)2017 (1)2018 (1)TypesArticle (2)

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    Bacterial RNA Biology on a Genome Scale.

    Hör, Jens; Gorski, Stanislaw A; Vogel, Jörg (2018-01-16)
    Bacteria are an exceedingly diverse group of organisms whose molecular exploration is experiencing a renaissance. While the classical view of bacterial gene expression was relatively simple, the emerging view is more complex, encompassing extensive post-transcriptional control involving riboswitches, RNA thermometers, and regulatory small RNAs (sRNAs) associated with the RNA-binding proteins CsrA, Hfq, and ProQ, as well as CRISPR/Cas systems that are programmed by RNAs. Moreover, increasing interest in members of the human microbiota and environmental microbial communities has highlighted the importance of understudied bacterial species with largely unknown transcriptome structures and RNA-based control mechanisms. Collectively, this creates a need for global RNA biology approaches that can rapidly and comprehensively analyze the RNA composition of a bacterium of interest. We review such approaches with a focus on RNA-seq as a versatile tool to investigate the different layers of gene expression in which RNA is made, processed, regulated, modified, translated, and turned over.
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    In Vivo Cleavage Map Illuminates the Central Role of RNase E in Coding and Non-coding RNA Pathways.

    Chao, Yanjie; Li, Lei; Girodat, Dylan; Förstner, Konrad U; Said, Nelly; Corcoran, Colin; Śmiga, Michał; Papenfort, Kai; Reinhardt, Richard; Wieden, Hans-Joachim; et al. (2017-01-05)
    Understanding RNA processing and turnover requires knowledge of cleavages by major endoribonucleases within a living cell. We have employed TIER-seq (transiently inactivating an endoribonuclease followed by RNA-seq) to profile cleavage products of the essential endoribonuclease RNase E in Salmonella enterica. A dominating cleavage signature is the location of a uridine two nucleotides downstream in a single-stranded segment, which we rationalize structurally as a key recognition determinant that may favor RNase E catalysis. Our results suggest a prominent biogenesis pathway for bacterial regulatory small RNAs whereby RNase E acts together with the RNA chaperone Hfq to liberate stable 3' fragments from various precursor RNAs. Recapitulating this process in vitro, Hfq guides RNase E cleavage of a representative small-RNA precursor for interaction with a mRNA target. In vivo, the processing is required for target regulation. Our findings reveal a general maturation mechanism for a major class of post-transcriptional regulators.
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