A systems-level analysis of perfect adaptation in yeast osmoregulation.

A systems-level analysis of perfect adaptation in yeast osmoregulation.
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DOI:
10.1016/j.cell.2009.04.047
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发表时间:
2009-07-10
期刊:
影响因子:
64.5
通讯作者:
van Oudenaarden A
van Oudenaarden A
中科院分区:
生物学1区
文献类型:
--
作者:
Muzzey D;Gómez-Uribe CA;Mettetal JT;van Oudenaarden A

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Negative feedback can serve many different cellular functions, including noise reduction in transcriptional networks and the creation of circadian oscillations. However, only one special type of negative feedback (“integral feedback”) ensures perfect adaptation, where steady-state output is independent of steady-state input. Here we quantitatively measure single-cell dynamics in the Saccharomyces cerevisiae hyperosmotic shock network, which regulates membrane turgor pressure. Importantly, we find that the nuclear enrichment of the MAP kinase Hog1 perfectly adapts to changes in external osmolarity, a feature robust to signaling fidelity and operating with very low noise. By monitoring multiple system quantities (e.g., cell volume, Hog1, glycerol) and using varied input waveforms (e.g., steps and ramps), we assess the network location of the mechanism responsible for perfect adaptation in a minimally invasive manner. We conclude that the system contains only one effective integrating mechanism, which requires Hog1 kinase activity and regulates glycerol synthesis but not leakage.
酵母OSMOSENSOR SLN1和植物细胞分裂素受体CRE1响应着爆炸压力的变化。
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影响因子: 7.8
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