在3'拼接部位的突变可以通过裂变酵母中U1 snRNA的补偿基变化来抑制
C I Reich1, R W VanHoy, G L Porter
1University of Illinois, Department of Biochemistry, Urbana 61801.
Cell
|June 26, 1992
概括
与3'拼接位AG的U1小核RNA (snRNA) 配对对于酵母中高效的内子拼接至关重要. 在U1 snRNA中的补偿突变恢复了拼接,揭示了与祖先RNA拼接机制的进化联系.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 遗传学 遗传学 是一个
背景情况:
- U1小核RNA (snRNA) 是一个关键的拼接因子,它与前信使RNAs的5'拼接位相互作用.
- 高效的拼接依赖于精确的识别内部的拼接位置.
研究的目的:
- 为了研究U1 snRNA与3'拼接位AG在Schizosaccharomyces pombe introns拼接中的作用.
- 探索3'拼接部位突变和U1 snRNA中补偿性变化的功能后果.
主要方法:
- 在Schizosaccharomyces pombe中利用人工内子来研究拼接效率.
- 引入了3'AG拼接部位的突变和U1 snRNA (C7和U8) 中的补偿突变.
- 分析了拼接中间体,包括线性前体积累和拉里亚特形成.
主要成果:
- 3'AG拼接部位的突变阻止了拼接的第一步,导致线性前体积累.
- 在U1 snRNA核酸C7和U8中的补偿性变化部分恢复了拉里亚特的形成.
- 在U1 snRNA中发生的突变是致命的 (C7) 或导致生长障碍和前体积累 (U8).
结论:
- 在S. pombe中,U1 snRNA与3'拼接位AG之间的相互作用对于高效的拼接至关重要.
- 这种相互作用突出了跨物种AG-依赖拼接中保存的机制.
- 这些发现表明,古老的分子内RNA相互作用可能先于U1 snRNA介导的拼接.
相关概念视频
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...


