Dendritic BC1 RNA in translational control mechanisms.

Dendritic BC1 RNA in translational control mechanisms.
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DOI:
10.1083/jcb.200506006
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发表时间:
2005-12-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tiedge H
Tiedge H
中科院分区:
其他
文献类型:
--
作者:
Wang H;Iacoangeli A;Lin D;Williams K;Denman RB;Hellen CU;Tiedge H

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突触的翻译控制被认为是神经元可塑性的关键决定因素。这种控制是如何实施的?我们报告说,小的非翻译BC1 RNA是一个特定的效应器的翻译控制在体外和体内。BC1 RNA在神经元和生殖细胞中表达,抑制翻译起始复合物组装中的限速步骤。BC1 RNA的独特3′结构域中含有翻译抑制元件。该结构域与真核起始因子4A和poly(A)结合蛋白的相互作用介导阻遏,表明3′ BC1结构域靶向这些因子之间的功能性相互作用。相比之下,BC 1 RNA与脆性X智力低下蛋白的相互作用无法记录。因此,BC1 RNA通过直接与翻译起始因子相互作用来调节神经元和生殖细胞中的转录依赖性过程。
Translational control at the synapse is thought to be a key determinant of neuronal plasticity. How is such control implemented? We report that small untranslated BC1 RNA is a specific effector of translational control both in vitro and in vivo. BC1 RNA, expressed in neurons and germ cells, inhibits a rate-limiting step in the assembly of translation initiation complexes. A translational repression element is contained within the unique 3′ domain of BC1 RNA. Interactions of this domain with eukaryotic initiation factor 4A and poly(A) binding protein mediate repression, indicating that the 3′ BC1 domain targets a functional interaction between these factors. In contrast, interactions of BC1 RNA with the fragile X mental retardation protein could not be documented. Thus, BC1 RNA modulates translation-dependent processes in neurons and germs cells by directly interacting with translation initiation factors.
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