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相关概念视频

RNA Structure01:19

RNA Structure

4.5K
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...
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RNA Stability01:53

RNA Stability

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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...
32.9K
Nucleic Acid Structure01:25

Nucleic Acid Structure

5.8K
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...
5.8K
Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

17.5K
Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

13.7K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
13.7K
Nucleic Acids02:43

Nucleic Acids

42.9K
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

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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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无序单链RNA的依赖序列的构造偏好.

Tong Wang1,2, Weiwei He3,4,2, Suzette A Pabit1

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA.

Cell reports. Physical science
|December 27, 2024
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概括

单链RNA (ssRNA) 的结构受其序列的影响. 研究人员使用先进的方法在ssRNA中揭示了不同的,依赖序列的构造,挑战了简单的聚合物模型.

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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 结构生物学 结构生物学

背景情况:

  • 无序的单链RNA (ssRNA) 分子根据它们的结构执行重要功能.
  • 鉴定本地ssRNAs异构的适应群体的特征存在重大挑战.
  • 了解序列如何影响ssRNA结构是研究的一个关键领域.

研究的目的:

  • 研究序列在确定单链RNA的结构和动态中的作用.
  • 为了比较RNA同聚合物和异聚合物的结构性质 (大小,形状,灵活性).
  • 使用集成的实验和计算方法开发ssRNA的详细结构组合.

主要方法:

  • 利用基于溶液的测量,包括小角度X射线散射 (SAXS) 和弗斯特共振能量转移 (FRET).
  • 采用实验引导的全原子分子动力学 (MD) 模拟.
  • 为30核酸RNA同聚合物 (rU30) 和富含A/C的异聚合物构建的结构组合.

主要成果:

  • 研究的ssRNAs的平均特性与灵活的聚合物物理模型保持一致.
  • 在分子层面上发现了明显的,依赖于序列的形状.
  • 这些发现凸显出ssRNA构造需要比标准聚合物模型更详细的表示.

结论:

  • 单链RNA的序列在塑造其整体结构性质方面发挥着至关重要的作用.
  • 综合实验和模拟方法对于表征复杂的ssRNA结构是有效的.
  • 未来的ssRNA模型应该包含特定序列的细节,以准确表示.