A T-stem slip in human mitochondrial tRNALeu(CUN) governs its charging capacity.

A T-stem slip in human mitochondrial tRNALeu(CUN) governs its charging capacity.
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人类线粒体trnaleu(CUN)的T型滑动控制其充电能力。

DOI:
10.1093/nar/gki677
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发表时间:
2005
影响因子:
14.9
通讯作者:
Wang, ED
Wang, ED
中科院分区:
生物学2区
文献类型:
--
作者:
Hao, R;Zhao, MW;Hao, ZX;Yao, YN;Wang, ED

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人线粒体tRNALeu(CUN)[hmtRNALeu(CUN)]对应于人线粒体蛋白基因中亮氨酸的最丰富密码子。在此,体外研究表明,对应于病理性T12311 C基因突变的hmtRNALeu(CUN)中的U48 C取代提高了hmtRNALeu(CUN)的氨酰化效率。酶的探测表明,一个更灵活的二级结构在野生型hmtRNALeu(CUN)的转录相比,U48 C突变体。结构分析表明,hmtRNALeu(CUN)的灵活性促进T-茎滑动,导致两个潜在的三级结构。几个合理设计的tRNALeu(CUN)突变体产生的T-茎滑检查的结构和功能的后果。对这些hmtRNALeu(CUN)突变体的检测表明,T-茎滑动控制tRNA接受活性。这些结果提示了一种新的tRNA结构和功能的自我调节机制。
The human mitochondrial tRNALeu(CUN) [hmtRNALeu(CUN)] corresponds to the most abundant codon for leucine in human mitochondrial protein genes. Here, in vitro studies reveal that the U48C substitution in hmtRNALeu(CUN), which corresponds to the pathological T12311C gene mutation, improved the aminoacylation efficiency of hmtRNALeu(CUN). Enzymatic probing suggested a more flexible secondary structure in the wild-type hmtRNALeu(CUN) transcript compared with the U48C mutant. Structural analysis revealed that the flexibility of hmtRNALeu(CUN) facilitates a T-stem slip resulting in two potential tertiary structures. Several rationally designed tRNALeu(CUN) mutants were generated to examine the structural and functional consequences of the T-stem slip. Examination of these hmtRNALeu(CUN) mutants indicated that the T-stem slip governs tRNA accepting activity. These results suggest a novel, self-regulation mechanism of tRNA structure and function.
DOI: 10.1016/s0092-8674(03)00280-0
发表时间: 2003-05-02
期刊: CELL
影响因子: 64.5
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