A circadian clock nanomachine that runs without transcription or translation.

A circadian clock nanomachine that runs without transcription or translation.
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DOI:
10.1016/j.conb.2013.02.012
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发表时间:
2013-10
影响因子:
5.7
通讯作者:
Johnson CH
Johnson CH
中科院分区:
医学2区
文献类型:
--
作者:
Egli M;Johnson CH

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昼夜节律计时的生化基础最适合蓝藻。它的关键分子成员KaIA、Kaib和KaiC的结构是已知的,这些蛋白质可以在试管中重建显着的昼夜振荡。KaiC是有节律性的磷酸化的,它的磷酸化状态是调节ATPase活性和纳米机器振荡组装的昼夜节律的标志。对纳米机器的分析揭示了它们的计时电路是如何被棘轮调整为单向的,以及它们如何保持同步以确保强大的振荡器。这些见解可能会阐明高等生物体的昼夜节律,包括当真正的起搏器是嵌入的生化振荡器时,转录和翻译如何看起来像是一个核心的昼夜节律计时器。
The biochemical basis of circadian timekeeping is best characterized in cyanobacteria. The structures of its key molecular players, KaiA, KaiB, and KaiC are known and these proteins can reconstitute a remarkable circadian oscillation in a test tube. KaiC is rhythmically phosphorylated and its phospho-status is a marker of circadian phase that regulates ATPase activity and the oscillating assembly of a nanomachine. Analyses of the nanomachines have revealed how their timing circuit is ratcheted to be unidirectional and how they stay in synch to ensure a robust oscillator. These insights are likely to elucidate circadian timekeeping in higher organisms, including how transcription and translation could appear to be a core circadian timer when the true pacemaker is an embedded biochemical oscillator.
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发表时间: 1990-02-08
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