C. elegans EIF-3.K promotes programmed cell death through CED-3 caspase.

C. elegans EIF-3.K promotes programmed cell death through CED-3 caspase.
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秀丽隐杆线虫EIF-3.K通过CED-3 caspase促进程序性细胞死亡。

DOI:
10.1371/journal.pone.0036584
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Wu YC
Wu YC
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Huang CY;Chen JY;Wu SC;Tan CH;Tzeng RY;Lu PJ;Wu YF;Chen RH;Wu YC

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程序性细胞死亡(细胞凋亡)对于后生动物的发育和体内平衡至关重要。执行程序性细胞死亡的核心步骤是半胱天冬酶的激活。在秀丽隐杆线虫中,核心细胞死亡调节因子 EGL-1(一种包含 BH3 结构域的蛋白质)、CED-9 (Bcl-2) 和 CED-4 (Apaf-1) 在抑制级联中发挥作用,激活 CED-3 caspase。在这里,我们鉴定了一个额外的成分 eif-3.K(真核翻译起始因子 3 亚基 k),它作用于 ced-3 的上游,促进程序性细胞死亡。 eif-3.K 的缺失减少了体细胞和生殖细胞的细胞死亡,而 eif-3.K 的过度表达导致细胞死亡略有但显着的增加。使用细胞特异性启动子,我们证明 eif-3.K 以细胞自主方式促进细胞死亡。此外,eif-3.K 的缺失显着抑制了通过 ced-4 过表达诱导的细胞死亡,但不抑制 ced-3,这表明细胞凋亡中对 eif-3.K 的独特需求。相反,ced-3 的缺失抑制了 eif-3.K 过度表达诱导的细胞死亡。这些结果表明 eif-3.K 需要 ced-3 来促进程序性细胞死亡,并且 eif-3.K 在 ced-3 的上游发挥作用以促进该过程。 EIF-3.K 蛋白在胚胎和幼虫中普遍表达,并定位于细胞质。结构功能分析表明,EIF-3.K 的 61 个氨基酸长的 WH 结构域可能参与蛋白质-DNA/RNA 相互作用,对于 EIF-3.K 的细胞死亡促进活性是必要且充分的。由于人类 eIF3k 能够部分替代秀丽隐杆线虫 eif-3.K 来促进细胞死亡,因此这种 WH 结构域依赖性 EIF-3.K 介导的细胞死亡过程可能在整个进化过程中得到保留。
Programmed cell death (apoptosis) is essential for the development and homeostasis of metazoans. The central step in the execution of programmed cell death is the activation of caspases. In C. elegans, the core cell death regulators EGL-1(a BH3 domain-containing protein), CED-9 (Bcl-2), and CED-4 (Apaf-1) act in an inhibitory cascade to activate the CED-3 caspase. Here we have identified an additional component eif-3.K (eukaryotic translation initiation factor 3 subunit k) that acts upstream of ced-3 to promote programmed cell death. The loss of eif-3.K reduced cell deaths in both somatic and germ cells, whereas the overexpression of eif-3.K resulted in a slight but significant increase in cell death. Using a cell-specific promoter, we show that eif-3.K promotes cell death in a cell-autonomous manner. In addition, the loss of eif-3.K significantly suppressed cell death-induced through the overexpression of ced-4, but not ced-3, indicating a distinct requirement for eif-3.K in apoptosis. Reciprocally, a loss of ced-3 suppressed cell death induced by the overexpression of eif-3.K. These results indicate that eif-3.K requires ced-3 to promote programmed cell death and that eif-3.K acts upstream of ced-3 to promote this process. The EIF-3.K protein is ubiquitously expressed in embryos and larvae and localizes to the cytoplasm. A structure-function analysis revealed that the 61 amino acid long WH domain of EIF-3.K, potentially involved in protein-DNA/RNA interactions, is both necessary and sufficient for the cell death-promoting activity of EIF-3.K. Because human eIF3k was able to partially substitute for C. elegans eif-3.K in the promotion of cell death, this WH domain-dependent EIF-3.K-mediated cell death process has potentially been conserved throughout evolution.
DOI: 10.1016/s1097-2765(00)80438-4
发表时间: 2000-03-01
期刊: MOLECULAR CELL
影响因子: 16
作者:
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发表时间: 1986-03-28
期刊: CELL
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