Structural insights into a circadian oscillator.
Structural insights into a circadian oscillator.
复制标题
对昼夜节律振荡器的结构见解。
DOI:
10.1126/science.1150451
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发表时间:
2008-10-31
期刊:
影响因子:
--
通讯作者:
Stewart PL
中科院分区:
文献类型:
--
作者:
Johnson CH;Egli M;Stewart PL
An endogenous circadian system in cyanobacteria exerts pervasive control over cellular processes including global gene expression. Indeed, the entire chromosome undergoes daily cycles of topological changes and compaction. The biochemical machinery underlying a circadian oscillator can be reconstituted in vitro with just three cyanobacterial proteins, KaiA, KaiB, and KaiC. These proteins interact to promote conformational changes and phosphorylation events that determine the phase of the in vitro oscillation. The high-resolution structures of these proteins suggest a racheting mechanism by which the KaiABC oscillator ticks unidirectionally. This post-translational oscillator may interact with transcriptional and translational feedback loops to generate the emergent circadian behavior in vivo. The conjunction of structural, biophysical, and biochemical approaches to this system reveals molecular mechanisms of biological timekeeping.
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