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:
影响因子:
--
通讯作者:
Takahashi JS
中科院分区:
文献类型:
--
作者:
Huang N;Chelliah Y;Shan Y;Taylor CA;Yoo SH;Partch C;Green CB;Zhang H;Takahashi JS
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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