The structural basis of translational control by eIF2 phosphorylation

The structural basis of translational control by eIF2 phosphorylation
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eIF2磷酸化控制翻译的结构基础

DOI:
10.1101/501411
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Adomavicius T
Adomavicius T
中科院分区:
--
文献类型:
--
作者:
Adomavicius T

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真核生物中的蛋白质合成是由信号和压力通过一个共同的途径控制的,称为综合压力反应(ISR)。翻译起始因子eIF 2 α在保守丝氨酸残基处的磷酸化介导ISR核心处的翻译控制。为了深入了解翻译控制的机制,我们通过电子冷冻显微镜确定了与核苷酸交换因子eIF 2B结合的磷酸化和非磷酸化形式的eIF 2的结构。结构显示eIF 2经历大的重排以促进eIF 2 α与eIF 2B的调控核心结合,所述调控核心由eIF 2B α、β和δ亚基组成。在eIF 2和eIF 2 αP与eIF 2B的结合之间仅观察到微小差异,表明eIF 2 αP对eIF 2B的较高亲和力驱动翻译控制。我们提出了一个模型的控制核苷酸交换和启动tRNA结合的eIF 2/eIF 2B复合物。
Protein synthesis in eukaryotes is controlled by signals and stresses via a common pathway, called the integrated stress response (ISR). Phosphorylation of the translation initiation factor eIF2 alpha at a conserved serine residue mediates translational control at the ISR core. To provide insight into the mechanism of translational control we have determined the structures of eIF2 both in phosphorylated and unphosphorylated forms bound with its nucleotide exchange factor eIF2B by electron cryomicroscopy. The structures reveal that eIF2 undergoes large rearrangements to promote binding of eIF2α to the regulatory core of eIF2B comprised of the eIF2B alpha, beta and delta subunits. Only minor differences are observed between eIF2 and eIF2αP binding to eIF2B, suggesting that the higher affinity of eIF2αP for eIF2B drives translational control. We present a model for controlled nucleotide exchange and initiator tRNA binding to the eIF2/eIF2B complex.
真核翻译起始因子 2 (eIF-2 α) 的 α 亚基发生突变,克服了 eIF-2 α 磷酸化对翻译起始的抑制作用。
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