含有s(2) U:A和s(2) U:U基对的RNA复合体的晶体结构研究
Jia Sheng1, Aaron Larsen, Benjamin D Heuberger
1Howard Hughes Medical Institute, Center for Computational and Integrative Biology, and Department of Molecular Biology, Simches Research Center, Massachusetts General Hospital , Boston, Massachusetts 02114, United States.
结构研究显示,2-thio-uridine (s(2) U) 稳定了U:A对,并特别稳定了RNA复杂体中的一个U:U构造,可能是通过硫键. 这提供了对RNA中修饰核基的新见解.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 在RNA生物学,RNA生物学.
背景情况:
- 在RNA复合体中修改的核基对于理解RNA稳定性和基配对特异性至关重要.
- 2-Thio-uridine (s(2) U) 是一种转移RNA (tRNA) 中发现的改性核基.
- 之前的热力学研究表明s(2) U稳定U:A对,破坏U:G波动对的稳定,但缺乏高分辨率结构.
研究的目的:
- 为了确定含有2-thio-uridine (s(2) U的RNA复合体的高分辨率晶体结构.
- 阐明s(2) U对RNA复合体中U:A和U:U基对的结构效应.
- 为了比较含有s(2) U的RNA复合体与它们的原生对应物的结构.
主要方法:
- 使用X射线晶体学来解决七分体RNA复合体的结构.
- 确定了两个具有s(2) U:A和s(2) U:U基对的结构.
- 本地RNA双重结构也在相同的条件下得到解决,以便进行比较.
主要成果:
- 在尿素的O2位置 (形成s(2) U) 用硫取代氧气,稳定了U:A基对,没有显著的结构变化.
- 与原生U:U对相比,一个s(2) U:U基对在特定的构造中具有强烈的稳定性.
- 这种s(2) U:U对的稳定部分归因于意外的硫介导键.
结论:
- 晶体结构提供了对s(2) U对RNA基配对的影响的直接可视化.
- s(2) U 显著影响基配对的稳定性,特别是对于 U:U 相互作用.
- 这些发现突显了硫在RNA中介于特定基配对相互作用中的作用.
更多相关视频
10:34Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
Published on: December 9, 2022
09:04Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
相关概念视频
RNA Structure
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
RNA Structure
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
RNA Structure
Nucleic acids
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
Nucleic Acids
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes,...
Nucleic Acid Structure
DNA Structure
DNA...
