Crystal structure of the heterodimeric CLOCK:BMAL1 transcriptional activator complex.

Crystal structure of the heterodimeric CLOCK:BMAL1 transcriptional activator complex.
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DOI:
10.1126/science.1222804
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发表时间:
2012-07-13
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Takahashi JS
Takahashi JS
中科院分区:
其他
文献类型:
--
作者:
Huang N;Chelliah Y;Shan Y;Taylor CA;Yoo SH;Partch C;Green CB;Zhang H;Takahashi JS

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哺乳动物的生物钟是由一个自动调节的转录反馈机制驱动的,大约需要24小时才能完成。该机制的一个关键组成部分是由两个bHLH-PAS结构域蛋白亚基CLOCK和BMAL 1组成的异二聚体转录激活因子。在这里,我们报告的晶体结构的复合物含有小鼠的时钟:BMAL 1 bHLH-PAS结构域在2.3倍分辨率。结构揭示了一个不寻常的不对称异源二聚体的三个结构域中的每一个的两个亚基,bHLH,PAS-A和PAS-B紧密交织,并参与二聚化相互作用,导致在三个不同的蛋白质界面。干扰所观察到的异二聚体界面的突变会影响CLOCK:BMAL 1复合物的稳定性和活性以及昼夜节律振荡器的周期性。CLOCK:BMAL 1复合物的结构是在原子水平上理解驱动哺乳动物生物钟机制的起点。
The circadian clock in mammals is driven by an autoregulatory transcriptional feedback mechanism that takes about 24 hours to complete. A key component of this mechanism is a heterodimeric transcriptional activator consisting of two bHLH-PAS domain protein subunits, CLOCK and BMAL1. Here we report the crystal structure of a complex containing the mouse CLOCK:BMAL1 bHLH-PAS domains at 2.3Å resolution. The structure reveals an unusual asymmetric heterodimer with the three domains in each of the two subunits, bHLH, PAS-A and PAS-B tightly intertwined and involved in dimerization interactions, resulting in three distinct protein interfaces. Mutations that perturb the observed heterodimer interfaces affect the stability and activity of the CLOCK:BMAL1 complex as well as the periodicity of the circadian oscillator. The structure of the CLOCK:BMAL1 complex is a starting point for understanding at an atomic level the mechanism driving the mammalian circadian clock.
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