Eukaryotic initiator tRNA: finely tuned and ready for action.

Eukaryotic initiator tRNA: finely tuned and ready for action.
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DOI:
10.1016/j.febslet.2009.11.047
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发表时间:
2010-01-21
期刊:
影响因子:
3.5
通讯作者:
Lorsch JR
Lorsch JR
中科院分区:
生物学3区
文献类型:
--
作者:
Kolitz SE;Lorsch JR

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起始tRNA必须具有与其他tRNA不同的功能,避免与延伸因子结合,而是在起始因子的帮助下直接与核糖体P位点结合。它还在解码起始密码子,为mRNA的翻译设置框架方面发挥关键作用。起始tRNA的序列元件和修饰将其与延伸子甲硫氨酰tRNA区分开来,并帮助其执行各种任务。这些身份元素似乎微调了起始tRNA的结构,越来越多的证据表明,tRNA的主体参与了将起始密码子已被发现的信号传递给前起始复合物的其余部分。
The initiator tRNA must serve functions distinct from those of other tRNAs, evading binding to elongation factors and instead binding directly to the ribosomal P site with the aid of initiation factors. It also plays a key role in decoding the start codon, setting the frame for translation of the mRNA. Sequence elements and modifications of the initiator tRNA distinguish it from the elongator methionyl tRNA and help it to perform its varied tasks. These identity elements appear to finely tune the structure of the initiator tRNA, and growing evidence suggests that the body of the tRNA is involved in transmitting the signal that the start codon has been found to the rest of the pre-initiation complex.
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