A unique conformation of the anticodon stem-loop is associated with the capacity of tRNAfMet to initiate protein synthesis.

A unique conformation of the anticodon stem-loop is associated with the capacity of tRNAfMet to initiate protein synthesis.
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DOI:
10.1093/nar/gkn462
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发表时间:
2008-09
影响因子:
14.9
通讯作者:
Tisné C
Tisné C
中科院分区:
生物学2区
文献类型:
--
作者:
Barraud P;Schmitt E;Mechulam Y;Dardel F;Tisné C

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在所有生物体中,翻译起始发生在小核糖体亚基上,存在两类蛋氨酸tRNA。引发剂专门用于蛋白质合成的起始,而延长剂用于在新生多肽链内部插入蛋氨酸。大肠杆菌引发剂tRNAfMet的晶体结构以3.1 Å的分辨率得到了解析。反密码子区是明确的,并揭示了一个独特的结构,这是没有在任何其他tRNA描述。它包括一个具有特殊几何形状的Cm32•A38碱基对,延伸反密码子螺旋,A37和G29-C41对之间的碱基对在反密码子茎的主槽中,以及一个修改的反密码子环的堆叠组织。这种构象与反密码子干中的三个GC碱基对有关,这是启动tRNA的特征,并表明翻译启动机制可以将启动tRNA与所有其他tRNA区分开来。
In all organisms, translational initiation takes place on the small ribosomal subunit and two classes of methionine tRNA are present. The initiator is used exclusively for initiation of protein synthesis while the elongator is used for inserting methionine internally in the nascent polypeptide chain. The crystal structure of Escherichia coli initiator tRNAfMet has been solved at 3.1 Å resolution. The anticodon region is well-defined and reveals a unique structure, which has not been described in any other tRNA. It encompasses a Cm32•A38 base pair with a peculiar geometry extending the anticodon helix, a base triple between A37 and the G29-C41 pair in the major groove of the anticodon stem and a modified stacking organization of the anticodon loop. This conformation is associated with the three GC basepairs in the anticodon stem, characteristic of initiator tRNAs and suggests a mechanism by which the translation initiation machinery could discriminate the initiator tRNA from all other tRNAs.
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