自然RNA纳米的冷EM结构
Xiaobin Ling1,2, Dmitrij Golovenko3, Jianhua Gan4
1RNA Therapeutics Institute, UMass Chan Medical School, Worcester, MA, USA. xiaobin.ling@umassmed.edu.
Nature
|June 16, 2025
概括
研究人员通过细菌和菌体的长非编码RNAs (lncRNAs) 形成的新型RNA纳米. 这些ROOLRNA结构可以被设计为研究和治疗中的潜在运输工具.
科学领域:
- * 分子生物学
- * 结构生物学
- *RNA生物学
背景情况:
- * 长非编码RNAs (lncRNAs) 在生物过程中至关重要,但它们的结构和功能往往是未知的.
- * 已经确定了20多种细菌和菌体 lncRNA,但它们的作用在很大程度上仍未被探索.
- * lncRNA的大小在描述它们的结构决定因素方面带来了挑战.
研究的目的:
- * 确定由ROOL lncRNA形成的自然RNA纳米的结构.
- * 阐明ROOLRNA纳米内的组合机制和稳定相互作用.
- * 探索用于货物交付的ROOLRNA纳米的工程潜力
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定ROOLRNA纳米和单体的结构.
- * 用比较基因组学来识别细菌和菌体基因组中的lncRNA.
- 使用RNA工程技术将不同RNA分子融合到ROOLRNA中.
主要成果:
- * 两种ROOLRNA纳米的结构以2.9Å分辨率解析,显示出一个八边形组件 (28nm直径,20nm长度).
- *纳米稳定涉及广泛的三级和四级相互作用,包括新的"A-小".
- *单体结构 (3.2-Å分辨率) 显示了一个链交换机制和四元吻环组装.
- * 设计的ROOL RNA纳米成功地显示了合的RNA体,转移RNA或微RNA作为辐射显示的货物.
结论:
- * ROOL lncRNA形成了稳定的八位基因组RNA纳米,有可能用于工程化货物显示.
- * 已发现的"A小"和链交换组装机制为RNA结构组织提供了洞察力.
- * 设计的ROOLRNA纳米为研究和治疗应用开发新型输送工具提供了一个有前途的平台.
相关概念视频
Cryo-electron Microscopy
3.7K
Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...
3.7K
RNA Structure
73.0K
Overview
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...
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...
73.0K
Nucleic Acid Structure
7.2K
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...
7.2K
Nucleic acids
170.6K
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,...
170.6K
RNA Stability
34.0K
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...
34.0K
Nucleic Acids
46.0K
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,...
46.0K


