Molecular basis of FIR-mediated c-myc transcriptional control.

Molecular basis of FIR-mediated c-myc transcriptional control.
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DOI:
10.1038/nsmb.1883
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发表时间:
2010-09
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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远上游元件(FUSE)调控系统在细胞周期中促进c-Myc浓度的峰值。首先,FBP转录激活子与c-myc启动子上游的融合DNA元件结合。然后,FBP招募其特定的抑制子(FIR),起到开/关转录开关的作用。在这里,我们描述了FIR招募的分子基础,表明FIR的串联RNA识别基序为独立的融合DNA和FBP蛋白结合提供了一个平台,并解释了FBP-FIR相互作用可逆性的结构基础。我们还表明,FBP和FIR之间的物理耦合是由顺序放置在招募元件上的柔性连接子调制的。我们的数据解释了FUSE系统是如何精确调控c-myc转录的,并表明FBP-FIR亲和力的微小变化会对c-Myc浓度产生重大影响。
The Far UpStream Element (FUSE) regulatory system promotes a peak in the concentration of c-Myc during cell cycle. First, the FBP transcriptional activator binds to the FUSE DNA element upstream of the c-myc promoter. Then, FBP recruits its specific repressor (FIR) which acts as an on/off transcriptional switch. Here we describe the molecular basis of FIR recruitment showing that the tandem RNA recognitions motifs of FIR provide a platform for independent FUSE DNA and FBP protein binding and explaining the structural basis of the reversibility of the FBP-FIR interaction. We also show that the physical coupling between FBP and FIR is modulated by a flexible linker positioned sequentially to the recruiting element. Our data explain how the FUSE system regulates precisely c-myc transcription and suggest that a small change in FBP–FIR affinity leads to a substantial effect on c-Myc concentration.
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