Rapid evolution of protein kinase PKR alters sensitivity to viral inhibitors.

Rapid evolution of protein kinase PKR alters sensitivity to viral inhibitors.
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DOI:
10.1038/nsmb.1529
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发表时间:
2009-01
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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PKR蛋白激酶在病毒感染过程中被激活,磷酸化真核翻译起始因子2 (eIF2)的α亚基,从而抑制翻译和病毒复制。我们报道了脊椎动物PKR激酶结构域的快速进化,以及特定位点的积极选择。将人类PKR中阳性选择的残基替换为相关物种中发现的残基,改变了对来自不同痘病毒的PKR抑制剂的敏感性。人类和小鼠PKR对痘病毒假底物抑制剂的敏感性存在物种特异性差异,这可以追溯到eif2 α-结合位点附近的阳性选择残基。我们的研究结果表明,抗病毒蛋白如何进化以逃避病毒抑制,同时保持其主要功能。此外,已确定的对病毒抑制剂易感性的物种特异性差异对研究非人类模型系统中的人类感染具有重要意义。
Protein kinase PKR is activated during viral infection and phosphorylates the α subunit of eukaryotic translation initiation factor 2 (eIF2), leading to inhibition of translation and viral replication. We report fast evolution of the PKR kinase domain in vertebrates, coupled with positive selection of specific sites. Substitution of positively selected residues in human PKR with residues found in related species altered sensitivity to PKR inhibitors from different poxviruses. Species-specific differences in sensitivity to poxviral pseudosubstrate inhibitors were identified between human and mouse PKR, which were traced to positively-selected residues near the eIF2α-binding site. Our findings indicate how an antiviral protein evolved to evade viral inhibition while maintaining its primary function. Moreover, the identified species-specific differences in the susceptibility to viral inhibitors have important implications for studying human infections in non-human model systems.
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