Eukaryotic translation initiation factor 3 (eIF3) subunit e is essential for embryonic development and cell proliferation.

Eukaryotic translation initiation factor 3 (eIF3) subunit e is essential for embryonic development and cell proliferation.
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真核翻译起始因子3(EIF3)亚基E对于胚胎发育和细胞增殖至关重要。

DOI:
10.1002/2211-5463.12482
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发表时间:
2018-08
期刊:
影响因子:
2.6
通讯作者:
Shibasaki F
Shibasaki F
中科院分区:
生物学4区
文献类型:
--
作者:
Sadato D;Ono T;Gotoh-Saito S;Kajiwara N;Nomura N;Ukaji M;Yang L;Sakimura K;Tajima Y;Oboki K;Shibasaki F

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哺乳动物真核生物翻译起始因子3(eIF 3)是翻译起始因子中最大的复合物。eIF 3复合物由13个亚基组成,在大多数多细胞生物中被命名为eIF 3a至eIF 3 m。小鼠乳腺肿瘤病毒(MMTV)的eIF 3e基因位点是MMTV最常见的整合位点之一,MMTV可诱导小鼠发生乳腺肿瘤。MMTV整合事件导致C末端截短的eIF 3e蛋白表达,导致乳腺肿瘤形成。我们已经证明,肿瘤形成可能部分由缺氧诱导因子2α的激活引起。为了研究eIF 3e在哺乳动物中的功能,我们产生了eIF 3e缺陷小鼠。这些eIF 3e −/−小鼠是胚胎致死的,而eIF 3e +/−小鼠比野生型小鼠小得多。此外,eIF 3e +/−小鼠胚胎成纤维细胞(MEFs)含有降低水平的eIF 3a和eIF 3c亚基,并表现出降低的细胞增殖。这些结果表明,eIF 3e对小鼠胚胎发育至关重要,并在维持eIF 3完整性方面发挥作用。
Mammalian eukaryotic translation initiation factor 3 (eIF3) is the largest complex of the translation initiation factors. The eIF3 complex is comprised of thirteen subunits, which are named eIF3a to eIF3 m in most multicellular organisms. The eIF3e gene locus is one of the most frequent integration sites of mouse mammary tumor virus (MMTV), which induces mammary tumors in mice. MMTV‐integration events result in the expression of C‐terminal‐truncated eIF3e proteins, leading to mammary tumor formation. We have shown that tumor formation can be partly caused by activation of hypoxia‐inducible factor 2α. To investigate the function of eIF3e in mammals, we generated eIF3e‐deficient mice. These eIF3e −/− mice are embryonically lethal, while eIF3e +/− mice are much smaller than wild‐type mice. In addition, eIF3e +/− mouse embryonic fibroblasts (MEFs) contained reduced levels of eIF3a and eIF3c subunits and exhibited reduced cellular proliferation. These results suggest that eIF3e is essential for embryonic development in mice and plays a role in maintaining eIF3 integrity.
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