Robust circadian oscillations in growing cyanobacteria require transcriptional feedback.
Robust circadian oscillations in growing cyanobacteria require transcriptional feedback.
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DOI:
10.1126/science.1230996
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发表时间:
2013-05-10
期刊:
影响因子:
--
通讯作者:
O'Shea EK
中科院分区:
文献类型:
--
作者:
Teng SW;Mukherji S;Moffitt JR;de Buyl S;O'Shea EK
The remarkably stable circadian oscillations of single cyanobacteria enable a population of growing cells to maintain synchrony for weeks. The cyanobacterial pacemaker is a post-translational regulation (PTR) circuit that generates circadian oscillations in the phosphorylation state of the clock protein, KaiC. Layered on top of the PTR is transcriptional-translational feedback regulation (TTR), common to all circadian systems, consisting of a negative feedback loop in which KaiC regulates its own production. We demonstrate that the PTR circuit is sufficient to generate oscillations in growing cyanobacteria. However, in the absence of TTR individual oscillators were less stable and synchrony was not maintained in a population of cells. Experimentally-constrained, mathematical modeling reproduced sustained oscillations in the PTR circuit alone and the importance of TTR for oscillator synchrony.
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