Competition among Hfq-binding small RNAs in Escherichia coli.

Competition among Hfq-binding small RNAs in Escherichia coli.
复制标题

DOI:
10.1111/j.1365-2958.2011.07907.x
复制
发表时间:
2011-12
影响因子:
3.6
通讯作者:
Gottesman S
Gottesman S
中科院分区:
生物学2区
文献类型:
--
作者:
Moon K;Gottesman S

文献摘要

参考文献

被引文献

相似文献

一类主要的细菌小RNA(sRNA)通过与靶mRNA配对来调节翻译和mRNA稳定性,这取决于RNA伴侣Hfq。Hfq与剪接蛋白的Lsm/Sm家族相关,结合sRNA并在体内稳定它们,并在体外刺激与mRNA的配对。虽然Hfq是丰富的,但sRNA在诱导时也同样丰富。因此,Hfq可能限制sRNA功能。我们发现,当过表达时,一些sRNA与内源性sRNA竞争结合Hfq。这与sRNA的较低积累(推测反映了Hfq结合的丧失)和sRNA在调节基因表达中的较低活性相关。Hfq限制sRNA的正调控和负调控。此外,删除表达的和特别有效的竞争sRNA的基因改善了其他sRNA对基因的调节,表明Hfq在正常生长条件下是限制性的。这些结果支持存在一个层次的sRNA竞争Hfq,调节一些sRNA的功能。
A major class of small bacterial RNAs (sRNAs) regulate translation and mRNA stability by pairing with target mRNAs, dependent upon the RNA chaperone Hfq. Hfq, related to the Lsm/Sm families of splicing proteins, binds the sRNAs and stabilizes them in vivo and stimulates pairing with mRNAs in vitro. Although Hfq is abundant, the sRNAs, when induced, are similarly abundant. Therefore, Hfq may be limiting for sRNA function. We find that, when overexpressed, a number of sRNAs competed with endogenous sRNAs for binding to Hfq. This correlated with lower accumulation of the sRNAs (presumably a reflection of the loss of Hfq binding), and lower activity of the sRNAs in regulating gene expression. Hfq was limiting for both positive and negative regulation by the sRNAs. In addition, deletion of the gene for an expressed and particularly effective competitor sRNA improved the regulation of genes by other sRNAs, suggesting that Hfq is limiting during normal growth conditions. These results support the existence of a hierarchy of sRNA competition for Hfq, modulating the function of some sRNAs.
DOI: 10.1101/gad.591310
发表时间: 2010-12-01
影响因子: 10.5
作者:
Fender, Aurelie;Elf, Johan;Wagner, E. Gerhart H.
通讯作者: Wagner, E. Gerhart H.
CERNA假设:隐藏RNA语言的Rosetta石头?
DOI: 10.1016/j.cell.2011.07.014
发表时间: 2011-08-05
期刊: Cell
影响因子: 64.5
作者:
Salmena L;Poliseno L;Tay Y;Kats L;Pandolfi PP
通讯作者: Pandolfi PP
DOI: 10.1128/jb.176.2.531-534.1994
发表时间: 1994-01-01
影响因子: 3.2
作者:
KAJITANI, M;KATO, A;ISHIHAMA, A
通讯作者: ISHIHAMA, A
DOI: 10.1021/bi102043f
发表时间: 2011-05-31
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Olejniczak, Mikolaj
通讯作者: Olejniczak, Mikolaj
DOI: 10.1101/gad.231702
发表时间: 2002-07-01
影响因子: 10.5
作者:
Moller, T;Franch, T;Valentin-Hansen, P
通讯作者: Valentin-Hansen, P