通过DNA甲基转移酶同源Dnmt2对tRNAAsp的甲基化
Mary Grace Goll1, Finn Kirpekar, Keith A Maggert
1Department of Genetics and Development, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
DNA甲基转移酶-2 (Dnmt2) 不会甲基化DNA. 相反,这种保存的酶在酸转移RNA (tRNA(Asp) 上甲基化一个特定的位点,这是物种间至关重要的功能.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 在RNA生物学,RNA生物学.
背景情况:
- 基因甲基转移酶 (DNMTs) 是关键的表观遗传调节剂.
- DNA甲基转移酶-2 (Dnmt2) 与DNMT具有结构上的相似之处.
- Dnmt2的确切功能一直是难以捉摸的.
研究的目的:
- 研究人类DNMT2.2.的酶活性和基质特异性.
- 为了确定DNMT2是否作为DNA甲基转移酶或具有不同的作用.
- 探索DNMT2.2的进化保护和功能机制.
主要方法:
- 结合遗传和生化方法被使用.
- 质谱法用于基质识别.
- 在实验室中使用异质系统进行了复制试验.
主要成果:
- 人类DNMT2被发现甲基化RNA,而不是DNA.
- 特定基质被确定为阿斯巴提酸转移RNA (tRNA(Asp)).
- 甲基化发生在tRNA (((Asp) 抗环中的细胞因子38处.
- 在老鼠,Arabidopsis thaliana和Drosophila melanogaster中保留了DNMT2的功能.
- 甲基化活性取决于先前存在的改性核酸.
结论:
- DNMT2是一种RNA甲基转移酶,专门针对tRNA.
- 这种RNA甲基化功能是进化保守的.
- 这些发现表明RNA和DNA甲基转移酶之间存在潜在的进化联系.
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