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相关概念视频

Mutations01:39

Mutations

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Overview
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RNA Structure01:19

RNA Structure

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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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Nucleic Acid Structure01:25

Nucleic Acid Structure

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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...
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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...
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Conserved Binding Sites01:49

Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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相关实验视频

Updated: May 31, 2025

Probing RNA Structure with Dimethyl Sulfate Mutational Profiling with Sequencing In Vitro and in Cells
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PRA-MutPred:使用结构特征预测蛋白-RNA复合体中点突变的影响.

K Harini1, M Sekijima2, M Michael Gromiha1,3

  • 1Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, India.

Journal of chemical information and modeling
|January 23, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了一种机器学习模型,以预测突变后蛋白质-RNA结合亲缘关系的变化. 这种工具,PRA-MutPred,通过分析结构和序列特征,有助于理解与疾病相关的突变.

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科学领域:

  • 计算生物学 计算生物学
  • 生物信息学是一种生物信息学.
  • 分子相互作用 分子相互作用

背景情况:

  • 蛋白质-RNA相互作用对于细胞功能至关重要.
  • 蛋白质的突变可以改变这些相互作用,导致疾病.
  • 量化突变时结合亲和度 (ΔΔG) 的变化是理解这些效应的关键.

研究的目的:

  • 开发一种机器学习模型,用于预测蛋白质-RNA复合体中的 ΔΔG.
  • 确定影响结合亲和力变化的关键特征.
  • 为这些预测创建一个用户友好的Web服务器.

主要方法:

  • 从134个蛋白质-RNA复合体中收集了710个实验确定的ΔΔG值.
  • 产生了多样化的序列和结构特征 (保存,残留,网络,接口).
  • 开发了一个支持向量的回归模型.

主要成果:

  • 该模型在刀测试中实现了0.75的相关性和0.84kcal/mol的平均绝对误差.
  • 结构特征,如接触潜力,接口原子接触和溶剂可访问性是最有影响力的.
  • 一个名为PRA-MutPred的网络服务器被创建,用于预测蛋白质-RNA结合亲和力变化.

结论:

  • 机器学习有效地预测蛋白质-RNA结合亲和力的突变诱导的变化.
  • 结构特征在确定这些亲和力变化方面发挥着重要作用.
  • 对于研究蛋白质-RNA相互作用和相关疾病的研究人员来说,PRA-MutPred提供了一个宝贵的工具.