RNA-binding proteins TIA-1 and TIAR link the phosphorylation of eIF-2 alpha to the assembly of mammalian stress granules.

RNA-binding proteins TIA-1 and TIAR link the phosphorylation of eIF-2 alpha to the assembly of mammalian stress granules.
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DOI:
10.1083/jcb.147.7.1431
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发表时间:
1999-12-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Anderson P
Anderson P
中科院分区:
其他
文献类型:
--
作者:
Kedersha NL;Gupta M;Li W;Miller I;Anderson P

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在环境胁迫下,相关的RNA结合蛋白TIA - 1和TIAR与多聚(A)+RNA共定位在细胞质聚集体中,这些聚集体类似于在热激植物细胞中容纳未翻译mRNA的应激颗粒(SGs)(诺弗等人,1989年;诺弗等人,1983年;沙尔夫等人,1998年)。在从亚致死胁迫中恢复的细胞中,未翻译mRNA在应激颗粒中的积累是可逆的,但在遭受致死胁迫的细胞中则是不可逆的。我们发现TIA - 1/R +应激颗粒的组装是由eIF - 2α的磷酸化引发的。一种模拟磷酸化的eIF - 2α突变体(S51D)诱导应激颗粒的组装,而一种不可磷酸化的eIF - 2α突变体(S51A)阻止应激颗粒的组装。一种缺失其RNA结合结构域的TIA - 1突变体作为应激颗粒形成的显性抑制因子发挥作用的能力表明,这种RNA结合蛋白在eIF - 2α磷酸化的下游起作用,以促进未翻译mRNA在应激颗粒中的隔离。应激颗粒的组装和解聚可能调节从环境胁迫中恢复的细胞中应激诱导的翻译停滞的持续时间。
In response to environmental stress, the related RNA-binding proteins TIA-1 and TIAR colocalize with poly(A)+ RNA at cytoplasmic foci that resemble the stress granules (SGs) that harbor untranslated mRNAs in heat shocked plant cells (Nover et al. 1989; Nover et al. 1983; Scharf et al. 1998). The accumulation of untranslated mRNA at SGs is reversible in cells that recover from a sublethal stress, but irreversible in cells subjected to a lethal stress. We have found that the assembly of TIA-1/R+ SGs is initiated by the phosphorylation of eIF-2α. A phosphomimetic eIF-2α mutant (S51D) induces the assembly of SGs, whereas a nonphosphorylatable eIF-2α mutant (S51A) prevents the assembly of SGs. The ability of a TIA-1 mutant lacking its RNA-binding domains to function as a transdominant inhibitor of SG formation suggests that this RNA-binding protein acts downstream of the phosphorylation of eIF-2α to promote the sequestration of untranslated mRNAs at SGs. The assembly and disassembly of SGs could regulate the duration of stress- induced translational arrest in cells recovering from environmental stress.
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