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相关概念视频

RNA Structure01:19

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...
4.8K
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
29.4K
Bacterial Transcription01:53

Bacterial Transcription

28.1K
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
28.1K
Types of RNA01:23

Types of RNA

63.5K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
63.5K
Nucleic Acid Structure01:25

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...
6.1K
Nucleic Acids02:43

Nucleic Acids

44.0K
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,...
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相关实验视频

Updated: Jun 21, 2025

Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation

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原细胞对RNA折叠,功能和进化的影响.

Ranajay Saha1, Jongseok A Choi1, Irene A Chen1

  • 1Department of Chemical and Biomolecular Engineering, Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California 90095-1592, United States.

Accounts of chemical research
|July 15, 2024
PubMed
概括
此摘要是机器生成的。

在囊泡中封装RNA可以增强 ribozyme 折叠和活性,通过偏好更高性能变体来加速进化. 这一发现提供了关于生命起源和最小细胞的发展的见解.

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Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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相关实验视频

Last Updated: Jun 21, 2025

Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
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Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Nanomanipulation of Single RNA Molecules by Optical Tweezers

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科学领域:

  • 生命的起源研究 生命的起源研究
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 益生菌是一种前生物.
  • 世界RNARNA世界RNA世界
  • 这一假设表明,RNA在DNA和蛋白质之前起到了遗传和催化作用.
  • 合作系统,就像早期生命一样,需要分隔才能生存和进化.
  • 最小的细胞可能起源于含有RNA代谢的简单囊泡.

研究的目的:

  • 研究膜囊泡内封装对RNA折叠和活性的影响.
  • 探索物理限制如何影响 ribozyme 功能和进化潜力.
  • 了解模型原细胞系统中出现的行为.

主要方法:

  • 使用Förster共振能量转移 (FRET) 来描述里波酶折叠和囊泡内的活性.
  • 采用高通量测序试验来测量众多 ribozyme 变体的氨基化动力学.
  • 进行了体外进化实验以观察适应率.

主要成果:

  • 封装通常通过排除体积效应促进RNA折叠,独立于化学相互作用.
  • 囊泡封闭增加了 ribozyme 的活性,并挽救了突变的 ribozymes 的功能.
  • 封装优先增强高活性 ribozyme 变体,导致更快的进化适应.

结论:

  • 在囊泡中的简单封装可以显著改变RNA的进化格局.
  • 分隔的物理效应,如被排除的体积,对于原细胞的功能和进化至关重要.
  • 研究最小的原细胞为理解从无生命物质到生物系统的过渡提供了一条途径.