Structural insights into interferon regulatory factor activation.

Structural insights into interferon regulatory factor activation.
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DOI:
10.1016/j.cellsig.2009.12.005
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发表时间:
2010-06
影响因子:
4.8
通讯作者:
Royer WE Jr
Royer WE Jr
中科院分区:
生物学2区
文献类型:
--
作者:
Chen W;Royer WE Jr

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干扰素调节因子(Interferon Regulatory Factor,IRFs)在免疫系统发育和宿主防御中起重要作用。最近的晶体学和生物化学研究提供了深入了解IRFs的磷酸化激活机制。细胞质中IRF潜在闭合构象的激活由C-末端区域中Ser/Thr残基的磷酸化触发。磷酸化刺激C-末端自身抑制结构域以获得高度延伸的构象,通过与第二亚基的广泛接触触发二聚化。然后二聚体被转运到细胞核中并与共激活因子CBP/p300组装以激活I型干扰素和其他靶基因的转录。在理解IRF二聚化后抑制的释放方面取得的进展已经产生了IRF信号通路如何被激活的详细结构模型。
The Interferon Regulatory Factors (IRFs) play important roles in development of the immune system and host defense. Recent crystallographic and biochemical studies have provided insights into the mechanism of activation of IRFs by phosphorylation. The activation of a latent closed conformation of IRF in the cytoplasm is triggered by phosphorylation of Ser/Thr residues in a C-terminal region. Phosphorylation stimulates the C-terminal autoinhibitory domain to attain a highly extended conformation triggering dimerization through extensive contacts to a second subunit. Dimers are then transported into the nucleus and assemble with the coactivator CBP/p300 to activate transcription of type I interferons and other target genes. The advances made in understanding the release of inhibition after IRF dimerization have generated a detailed structural model of how IRFs signaling pathways are activated.
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