Widespread suppression of intragenic transcription initiation by H-NS.
Widespread suppression of intragenic transcription initiation by H-NS.
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DOI:
10.1101/gad.234336.113
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发表时间:
2014-02-01
影响因子:
10.5
通讯作者:
Grainger DC
中科院分区:
文献类型:
--
作者:
Singh SS;Singh N;Bonocora RP;Fitzgerald DM;Wade JT;Grainger DC
H-NS is a bacterial folding factor that has been implicated in the silencing of horizontally acquired genes. These genes are thought to be toxic by virtue of their A/T content. Here, Singh et al. show that a major, long-overlooked function of H-NS is to prevent widespread initiation of noncoding transcripts within foreign genes. This study provides a molecular rationalization for the toxicity of horizontally acquired DNA and explains how this is counteracted by H-NS. Widespread intragenic transcription initiation has been observed in many species. Here we show that the Escherichia coli ehxCABD operon contains numerous intragenic promoters in both sense and antisense orientations. Transcription from these promoters is silenced by the histone-like nucleoid structuring (H-NS) protein. On a genome-wide scale, we show that 46% of H-NS-suppressed transcripts in E. coli are intragenic in origin. Furthermore, many intergenic promoters repressed by H-NS are for noncoding RNAs (ncRNAs). Thus, a major overlooked function of H-NS is to prevent transcription of spurious RNA. Our data provide a molecular description for the toxicity of horizontally acquired DNA and explain how this is counteracted by H-NS.
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影响因子:
6.4
作者:
Raghavan R;Sloan DB;Ochman H
通讯作者:
Ochman H
DOI:
10.1073/pnas.0913551107
发表时间:
2010-03-16
影响因子:
11.1
作者:
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通讯作者:
Liu, Jun
影响因子:
3.1
作者:
Iyoda, Sunao;Honda, Naoko;Ohnishi, Makoto
通讯作者:
Ohnishi, Makoto
影响因子:
9.9
作者:
通讯作者:
--
影响因子:
14.9
作者:
Keseler IM;Mackie A;Peralta-Gil M;Santos-Zavaleta A;Gama-Castro S;Bonavides-Martínez C;Fulcher C;Huerta AM;Kothari A;Krummenacker M;Latendresse M;Muñiz-Rascado L;Ong Q;Paley S;Schröder I;Shearer AG;Subhraveti P;Travers M;Weerasinghe D;Weiss V;Collado-Vides J;Gunsalus RP;Paulsen I;Karp PD
通讯作者:
Karp PD