SARS-CoV-2核体蛋白质的失序的N端尾部与RNA形成了一个动态复合体
Jasmine Cubuk1,2, Jhullian J Alston1,2, J Jeremías Incicco1,2
1Department of Biochemistry and Molecular Biophysics, Washington University in St Louis, 660 St Euclid Ave, 63110 Saint Louis, MO, USA.
Nucleic acids research
|December 28, 2023
概括
在SARS-CoV-2核囊蛋白的失序N-终端域显著增强RNA结合亲和力. 奥米克龙变异突变会影响这些相互作用,这表明N端域在病毒基因组凝聚中的功能作用.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- SARS-CoV-2核体 (N) 蛋白在包装病毒RNA基因组中起着至关重要的作用.
- 了解N蛋白的核酸结合机制对于理解病毒基因组凝结至关重要.
研究的目的:
- 研究N蛋白的RNA结合域 (RBD) 和其无序的N终端域 (NTD) 尾部对核酸结合的贡献.
- 描述NTD对RNA结合亲和力和N蛋白内结构变化的影响.
主要方法:
- 用单分子弗斯特共振能量转移 (smFRET) 试验来研究蛋白质与核酸相互作用.
- 粗粒模拟被用来建模构形动力学和结合机制.
- 进行了接触部位大小,结合亲和力和RNA长度依赖效应的量化.
主要成果:
- 混乱的NTD大约增加了RBD的RNA结合亲和力50倍.
- 与RNA的结合,无论是特定的还是非特定的,都会以RNA长度依赖的方式改变NTD尾巴的配置.
- 在Omicron变异中的突变调节NTD-RBD相互作用,突出突出了乱的尾巴的功能意义.
结论:
- 混乱的NTD对于SARS-CoV-2 N蛋白质的高亲密性RNA结合至关重要.
- 该N蛋白的NTD-RBD优先结合单链RNA,形成灵活和动态的复合体.
- 这种相互作用机制可能有助于N蛋白在病毒基因组内定位和结合高 afinity 动机的能力.
相关概念视频
Protein Complex Assembly
10.6K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
10.6K
RNA Structure
4.8K
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. 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) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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...
4.8K
Nucleic Acid Structure
6.1K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
6.1K
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
Nucleic Acids
44.2K
Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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,...
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,...
44.2K
RNA Stability
33.5K
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...
33.5K


