Discretely calibrated regulatory loops controlled by ppGpp partition gene induction across the 'feast to famine' gradient in Escherichia coli.
Discretely calibrated regulatory loops controlled by ppGpp partition gene induction across the 'feast to famine' gradient in Escherichia coli.
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DOI：
10.1111/j.1365-2958.2010.07498.x
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发表时间：
2011-02
影响因子：
3.6
通讯作者：
Conway T
中科院分区：
文献类型：
--
作者：
Traxler MF;Zacharia VM;Marquardt S;Summers SM;Nguyen HT;Stark SE;Conway T
Bacteria comprehensively reorganize their global gene expression when faced with starvation. The alarmone ppGpp facilitates this massive response by coordinating the down-regulation of genes of the translation apparatus, and the induction of biosynthetic genes and the general stress response. Such a large reorientation requires the activities of multiple regulators, yet the regulatory network downstream of ppGpp remains poorly defined. Transcription profiling during isoleucine depletion, which leads to gradual starvation (over >100 min), allowed us to identify genes that required ppGpp, Lrp, and RpoS for their induction and to deduce the regulon response times. Although the Lrp and RpoS regulons required ppGpp for their activation, they were not induced simultaneously. The data suggest that metabolic genes, i.e., those of the Lrp regulon, require only a low level of ppGpp for their induction. In contrast, the RpoS regulon was induced only when high levels of ppGpp accumulated. We tested several predictions of a model that explains how bacteria allocate transcriptional resources between metabolism and stress response by discretely tuning two regulatory circuits to different levels of ppGpp. The emergent regulatory structure insures that stress survival circuits are only triggered if homeostatic metabolic networks fail to compensate for environmental deficiencies.
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影响因子：
4.8
作者：
Liu, MZ;Durfee, T;Blattner, FR
通讯作者：
Blattner, FR
DOI：
10.1073/pnas.0705561104
发表时间：
2007-07-31
影响因子：
11.1
作者：
Bougdour, Alexandre;Gottesman, Susan
通讯作者：
Gottesman, Susan
影响因子：
3.2
作者：
LIN, RT;DARI, R;NEWMAN, EB
通讯作者：
NEWMAN, EB
影响因子：
3.2
作者：
Ibanez-Ruiz, M;Robbe-Saule, V;Norel, F
通讯作者：
Norel, F
影响因子：
3.2
作者：
LANGE, R;FISCHER, D;HENGGEARONIS, R
通讯作者：
HENGGEARONIS, R