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相关概念视频

Cryo-electron Microscopy01:28

Cryo-electron Microscopy

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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...
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RNA Structure01:23

RNA Structure

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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...
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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
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Single Particle Cryo-Electron Microscopy: From Sample to Structure
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Single Particle Cryo-Electron Microscopy: From Sample to Structure

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一个大规模的冷EMRNA基因数据集和基于机器学习的结构建模的基准.

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    此摘要是机器生成的。

    来自冷电子显微镜 (cryo-EM) 数据的125,000个RNA结构图案的新数据集有助于预测RNA结构. 该资源使机器学习能够分析RNA二次结构,这对于治疗设计至关重要.

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    Do's and Don'ts of Cryo-electron Microscopy: A Primer on Sample Preparation and High Quality Data Collection for Macromolecular 3D Reconstruction

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    科学领域:

    • 结构生物学 结构生物学
    • 计算生物学 计算生物学
    • 生物化学 生物化学

    背景情况:

    • RNA的3D结构对其生物功能至关重要,包括基因调节和病毒复制.
    • RNA二次结构图案是复杂RNA架构的基本构建块.
    • 目前用于从冷电子显微镜 (cryo-EM) 数据中预测RNA结构的计算方法,由于有限的数据集,往往缺乏对这些图案的明确利用.

    研究的目的:

    • 引入一个大型的,开源数据集的动图解析的冷电子显微镜 (cryo-EM) 密度图和相应的原子结构.
    • 促进机器学习方法用于RNA结构预测和分析.
    • 为以RNA为中心的治疗设计和结构研究提供一个有价值的资源.

    主要方法:

    • 汇编了25个RNA二级结构图案类的超过125,000个解析图案的冷EM密度图.
    • 将细分的冷-电磁密度图标准化为3D语音格子,并附有语音级别的注释.
    • 使用对原子模型的交叉相关性分析验证细分质量.

    主要成果:

    • 数据集的分辨率从1.5 Å到34.0 Å不等,涵盖了高分辨率和低分辨率的冷电磁数据.
    • 在细分型图形密度图和原子参考模型之间显示出强烈的一致性.
    • 在高分辨率地图上训练的机器学习分类器在区分五个动图类别时获得了0.948的特异性.

    结论:

    • 本文所介绍的数据集是推进计算RNA结构分析的重要资源.
    • 允许开发机器学习模型,这些模型明确包含RNA二级结构动机.
    • 促进更准确的RNA结构预测,并有助于设计基于RNA的新疗法.