在RNA降解和脱之间,通过外核糖酶进行弹性合
Gwangrog Lee1, Matthew A Bratkowski, Fang Ding
1Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, USA.
概括
酵母外体组件Rrp44 (Dis3) 使用其自身的RNA消化能量以突发方式解开RNA,而不是单个步骤. 这种RNA解开,而不是分裂,决定了降解速度,受复杂弹性的影响.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 处理RNA处理RNA的过程
背景情况:
- 酵母外体复合体对于RNA处理至关重要,它含有催化子单元Rrp44 (Dis3).
- Rrp44表现出3'到5'过程性RNA消化.
- 与螺旋酶不同,Rrp44的运动功能是由核酶活性驱动的,而不是ATP水解.
研究的目的:
- 通过Rrp44.4来研究RNA解的机制.
- 为了确定控制RNA降解速度的因素,Rrp44.
- 为了阐明Rrp44介导RNA解的能量源和步骤大小.
主要方法:
- 单分子光分析,观察RNA解动态.
- 动态分析以测量RNA降解速率并确定速度限制的步骤.
主要成果:
- Rrp44在约四个基对的爆发中解开RNA,从多个水解事件中积累能量.
- RNA解,而不是分裂或链释放,是RNA降解的速度限制步骤.
- 解线的步骤大小由Rrp44/RNA复合体的非线性弹性决定,独立于双重稳定性.
结论:
- Rrp44的运动功能与其核酶活动密切相关,利用释放的能量进行RNA解.
- 独特的解机制及其对复杂弹性的依赖提供了对外体介导RNA处理和降解的洞察.
相关概念视频
mRNA Stability and Gene Expression
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
Cis-acting Elements involved in mRNA stability
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...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
RNA Stability
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...


