Regulatory response to carbon starvation in Caulobacter crescentus.

Regulatory response to carbon starvation in Caulobacter crescentus.
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DOI:
10.1371/journal.pone.0018179
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发表时间:
2011-04-11
期刊:
影响因子:
3.7
通讯作者:
Shapiro L
Shapiro L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Britos L;Abeliuk E;Taverner T;Lipton M;McAdams H;Shapiro L

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细菌适应从快速生长到缓慢生长的转变,并制定了在长期饥饿和应激条件下长期生存的策略。我们基于高通量蛋白质组和转录组分析,报告了 C. crescentus 对碳饥饿的调控反应。我们的结果确定了响应碳饥饿的细胞周期基因表达变化,其中涉及 FixK FNR/CAP 家族转录因子和 CtrA 细胞周期调节因子的显着作用。值得注意的是,SigT ECF sigma 因子介导碳饥饿诱导的 CtrA 降解,同时激活一组核心的一般饥饿应激基因,这些基因对碳饥饿、渗透应激和重金属暴露做出反应。比较群细胞和茎细胞对碳饥饿的反应揭示了四组表现出不同表达谱的基因。此外,在碳饥饿细胞中,细胞极形态发生和染色体复制的启动通常发生在群细胞向茎细胞转变时是不耦合的。
Bacteria adapt to shifts from rapid to slow growth, and have developed strategies for long-term survival during prolonged starvation and stress conditions. We report the regulatory response of C. crescentus to carbon starvation, based on combined high-throughput proteome and transcriptome analyses. Our results identify cell cycle changes in gene expression in response to carbon starvation that involve the prominent role of the FixK FNR/CAP family transcription factor and the CtrA cell cycle regulator. Notably, the SigT ECF sigma factor mediates the carbon starvation-induced degradation of CtrA, while activating a core set of general starvation-stress genes that respond to carbon starvation, osmotic stress, and exposure to heavy metals. Comparison of the response of swarmer cells and stalked cells to carbon starvation revealed four groups of genes that exhibit different expression profiles. Also, cell pole morphogenesis and initiation of chromosome replication normally occurring at the swarmer-to-stalked cell transition are uncoupled in carbon-starved cells.
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