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Updated: Jun 3, 2025

An In Vitro Assay to Detect tRNA-Isopentenyl Transferase Activity

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Published on: October 8, 2018

人类TRMT1和TRMT1L对应物确保tRNAs的适当修饰状态,稳定性和功能

Kejia Zhang¹, Aidan C Manning², Jenna M Lentini¹

¹Department of Biology, Center for RNA Biology, University of Rochester, Rochester, NY, USA.

|January 9, 2025

概括

的tRNA甲基转移酶1 (TRMT1) 和TRMT1-like (TRMT1L) 酶修改tRNAs. TRMT1L独特地修改了氨酸tRNA,并影响了其他tRNA修改,TRMT1变异与tRNA缺乏障碍有关.

科学领域:

分子生物学分子生物学
生物化学生物化学
遗传学是一个遗传学.

背景情况:

转移RNA (tRNA) 对于蛋白质合成至关重要.
转录后的tRNA修改,如N2,N2-二甲基瓜诺辛 (m2,2G),对于tRNA功能至关重要.
脊椎动物拥有两种同类物TRMT1和TRMT1L,参与tRNA修饰,但它们的具体作用在很大程度上仍未被阐明.

研究的目的:

为了全面识别人类TRMT1和TRMT1L的tRNA标.
阐明TRMT1和TRMT1L在tRNA修饰中的特定作用,包括m2,2G和其他修饰.
研究m2,2G修饰对tRNA稳定性和翻译的功能后果,以及它们与人类疾病的联系.

主要方法:

使用全面的tRNA测序来描述tRNA的修饰.
使用生物化学测试来确定酶的特异性和活性.
分析了具有TRMT1变异的患者衍生细胞,以评估体内后果.

主要成果:

证实TRMT1在各种tRNA中的26位甲基化guanosine.
确定TRMT1L是负责m2,2G修饰的酶,该酶位于铁素tRNAs的27位.
研究人员发现TRMT1L对于维持3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 碳酸烯基氨酸 (acp3U) 在tRNA子集中的修饰是必不可少的,独立于其甲基转移酶活性.
对于它们的稳定性和翻译效率来说,tRNAs中的m2,2G修饰对氨酸和血清蛋白具有关键作用.
携带TRMT1变异的人类细胞显示氨酸和血清tRNA水平降低,将TRMT1功能障碍与tRNA缺乏症相关联.

结论:

在tRNA修饰中,TRMT1和TRMT1L表现出不同的重叠作用.
TRMT1L在修改氨酸tRNA方面具有独特的功能,并影响其他tRNA修改.
m2,2G修饰对于特定tRNA的稳定性和功能至关重要,影响翻译.
在TRMT1功能的缺陷导致降低的tRNA水平,并与人类疾病相关,突出显示tRNA修饰途径的重要性.

关键词:

科普:分子生物学分子生物学基因组RNA的修饰是RNA的修饰.TRMT1 是一个TRMT1 TRMT1L TRMT1L 的时间这就是Trim1的意义.智力障碍智力障碍是一种智力障碍.m2,2G2G是什么意思一个模拟模拟器.这是一个tRNARNA.翻译翻译翻译翻译翻译翻译

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