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U6 snRNA m6 A甲基转移酶 METTL16 调节SAM合成酶的内保留
Kathryn E Pendleton1, Beibei Chen2, Kuanqing Liu3
1Department of Microbiology, UT Southwestern Medical Center, Dallas, TX 75390, USA.
Cell
|May 20, 2017
概括
甲基转移酶METTL16通过控制替代拼接来调节SAM合成酶 (MAT2A) 的表达. 这种机制有助于维持细胞S-adenosylmethionine (SAM) 稳态,而METTL16也会甲基化U6 snRNA.
科学领域:
- 分子生物学
- 基因调控
- 核糖核酸生物学
背景情况:
- S-adenosylmethionine (SAM) 对许多生物过程至关重要.
- METTL16是一种已知作用的N6-腺甲基转移酶.
- 调节SAM合成酶 (MAT2A) 表达对于细胞SAM水平至关重要.
研究的目的:
- 研究METTL16在调节MAT2A表达中的作用.
- 阐明SAM水平影响MAT2A表达的机制.
- 确定METTL16在U6结合体小核RNA (snRNA) 修饰中的功能.
主要方法:
- 基因表达和拼接的分析.
- 用RNA免疫沉 (RIP) 测试来确定蛋白质与RNA的相互作用.
- 在体外甲基化试验.
- 细胞SAM水平的测量.
主要成果:
- METTL16通过保留的内子的替代拼接来调节人类的MAT2A表达.
- 通过在 MAT2A 3' UTR 中依赖 METTL16 的发针结构的拼接,SAM 耗尽会诱导 MAT2A 表达.
- METTL16被确定为U6 snRNA的甲基转移酶.
- 在MAT2A 3' UTR上增加METTL16占用率有助于拼接.
结论:
- 在调节SAM稳态和U6 snRNA修饰方面,METTL16具有双重作用.
- 在SAM调节中,N6-腺甲基转移酶METTL16已经演变为脊椎动物特异性功能.
- 通过METTL16介导的MAT2A拼接是维持在压力下细胞SAM水平的关键机制.
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