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Eukaryotic initiation factor 3 (eIF3) is a multiprotein complex that functions during the initiation phase of eukaryotic translation. It is essential for most forms of cap-dependent and cap-independent translation initiation. In humans, eIF3 consists of 13 nonidentical subunits (eIF3a-m) with a combined molecular weight of ~800 kDa, making it the largest translation initiation factor. The eIF3 complex is broadly conserved across eukaryotes, but the conservation of individual subunits varies across organisms. For instance, while most mammalian eIF3 complexes are composed of 13 subunits, budding yeast's eIF3 has only six subunits (eIF3a, b, c, g, i, j).

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  • Eukaryotic initiation factor 3 (en)
  • 真核起始因子3 (zh)
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  • Eukaryotic initiation factor 3 (eIF3) is a multiprotein complex that functions during the initiation phase of eukaryotic translation. It is essential for most forms of cap-dependent and cap-independent translation initiation. In humans, eIF3 consists of 13 nonidentical subunits (eIF3a-m) with a combined molecular weight of ~800 kDa, making it the largest translation initiation factor. The eIF3 complex is broadly conserved across eukaryotes, but the conservation of individual subunits varies across organisms. For instance, while most mammalian eIF3 complexes are composed of 13 subunits, budding yeast's eIF3 has only six subunits (eIF3a, b, c, g, i, j). (en)
  • eIF3(eukaryotic initiation factor 3,真核起始因子3)是最大的真核起始因子,在哺乳动物细胞中,其分子量超过了600KDa。eIF3是真核翻译起始进程中起着核心作用。例如,eIF3可以使eIF2·GTP·Met-tRNAi三联体复合物稳定地结合到40S核糖体亚基上,并促使43S前起始复合物的形成;它能够通过促进mRNA与40S亚基结合;而且,它还可以与游离的40S亚基结合,影响40S亚基与60S亚基及其他eIF的结合或解离等等。 eIF3是一个结构中心,可以与不同的真核起始因子以及RNA结合来调控整个翻译起始进程。 eIF3是一个多亚基复合物,也是最复杂的起始因子。哺乳动物中存在13种不同的亚基(a、b、c、d、e、f、g、h、i、j、k、l和m),而部分酵母中只有6个(a、b、c、g、i、j)。 (zh)
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  • Eukaryotic initiation factor 3 (eIF3) is a multiprotein complex that functions during the initiation phase of eukaryotic translation. It is essential for most forms of cap-dependent and cap-independent translation initiation. In humans, eIF3 consists of 13 nonidentical subunits (eIF3a-m) with a combined molecular weight of ~800 kDa, making it the largest translation initiation factor. The eIF3 complex is broadly conserved across eukaryotes, but the conservation of individual subunits varies across organisms. For instance, while most mammalian eIF3 complexes are composed of 13 subunits, budding yeast's eIF3 has only six subunits (eIF3a, b, c, g, i, j). (en)
  • eIF3(eukaryotic initiation factor 3,真核起始因子3)是最大的真核起始因子,在哺乳动物细胞中,其分子量超过了600KDa。eIF3是真核翻译起始进程中起着核心作用。例如,eIF3可以使eIF2·GTP·Met-tRNAi三联体复合物稳定地结合到40S核糖体亚基上,并促使43S前起始复合物的形成;它能够通过促进mRNA与40S亚基结合;而且,它还可以与游离的40S亚基结合,影响40S亚基与60S亚基及其他eIF的结合或解离等等。 eIF3是一个结构中心,可以与不同的真核起始因子以及RNA结合来调控整个翻译起始进程。 eIF3是一个多亚基复合物,也是最复杂的起始因子。哺乳动物中存在13种不同的亚基(a、b、c、d、e、f、g、h、i、j、k、l和m),而部分酵母中只有6个(a、b、c、g、i、j)。 (zh)
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