Insights into interferon regulatory factor activation from the crystal structure of dimeric IRF5.

Insights into interferon regulatory factor activation from the crystal structure of dimeric IRF5.
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DOI:
10.1038/nsmb.1496
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发表时间:
2008-11
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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干扰素调节因子(IRFs)在先天免疫反应和其他生理过程中是必不可少的。这些蛋白质在细胞质中的激活由C-末端自抑制区中的Ser/Thr残基的磷酸化触发,其刺激二聚化、转运到细胞核中、与共激活因子CBP/p300组装以及转录起始。新的晶体结构的反式激活域的pseudophosphorylated人IRF 5揭示了一个惊人的二聚体,其中大部分的亚基间相互作用涉及一个高度扩展的C-末端区域。相应的区域先前已显示阻断CBP/p300与未磷酸化的IRF 3结合。关键界面残基的突变支持观察到的二聚体作为IRF 5和IRF 3的生理活化状态。因此,磷酸化可能激活IRF 5和其他家庭成员触发显着的构象重排,开关的C-末端片段从一个autoinhibitory二聚化的作用。
Interferon regulatory factors (IRFs) are essential in the innate immune response and other physiological processes. Activation of these proteins in the cytoplasm is triggered by phosphorylation of Ser/Thr residues in a C-terminal autoinhibitory region, which stimulates dimerization, transport into the nucleus, assembly with the coactivator CBP/p300 and initiation of transcription. The novel crystal structure of the transactivation domain of pseudophosphorylated human IRF5 reveals a striking dimer in which the bulk of intersubunit interactions involve a highly extended C-terminal region. The corresponding region has previously been shown to block CBP/p300 binding to unphosphorylated IRF3. Mutation of key interface residues supports the observed dimer as the physiologically activated state of IRF5 and IRF3. Thus phosphorylation likely activates IRF5 and other family members by triggering remarkable conformational rearrangements that switch the C-terminal segment from an autoinihibitory to a dimerization role.
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