DksA guards elongating RNA polymerase against ribosome-stalling-induced arrest.

DksA guards elongating RNA polymerase against ribosome-stalling-induced arrest.
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DOI:
10.1016/j.molcel.2014.02.005
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发表时间:
2014-03-06
期刊:
影响因子:
16
通讯作者:
Wang, Jue D.
Wang, Jue D.
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Yan;Mooney, Rachel A.;Grass, Jeffrey A.;Sivaramakrishnan, Priya;Herman, Christophe;Landick, Robert;Wang, Jue D.

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In bacteria, translation-transcription coupling inhibits RNA polymerase (RNAP) stalling. We present evidence suggesting that, upon amino acid starvation, inactive ribosomes promote rather than inhibit RNAP stalling. We developed an algorithm to evaluate genome-wide polymerase progression independently of local noise, and used it to reveal that the transcription factor DksA inhibits promoter-proximal pausing and increases RNAP elongation when uncoupled from translation by depletion of charged tRNAs. DksA has minimal effect on RNAP elongation in vitro and on untranslated RNAs in vivo. In these cases, transcripts can form RNA structures that prevent backtracking. Thus, the effect of DksA on transcript elongation may occur primarily upon ribosome slowing/stalling or at promoter-proximal locations that limit the potential for RNA structure. We propose that inactive ribosomes prevent formation of backtrack-blocking mRNA structures and that, in this circumstance, DksA acts as a transcription elongation factor in vivo.
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