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相关概念视频

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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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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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相关实验视频

Updated: Jul 8, 2025

A Protocol for Computer-Based Protein Structure and Function Prediction
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A Protocol for Computer-Based Protein Structure and Function Prediction

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通过结构功能分析验证EMCV IRES二级结构.

Adam Maloney1, Simpson Joseph1

  • 1Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314, United States.

Biochemistry
|December 11, 2023
PubMed
概括
此摘要是机器生成的。

脑肌心炎病毒内部核糖体进入部位 (IRES) 结构对于翻译至关重要. 这项研究验证了特定的IRES结构,并强调了域I在病毒翻译启动中的重要性.

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Assessment of Immunologically Relevant Dynamic Tertiary Structural Features of the HIV-1 V3 Loop Crown R2 Sequence by ab initio Folding
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科学领域:

  • 分子生物学分子生物学
  • 病毒学 病毒学
  • 结构RNA结构RNA结构

背景情况:

  • 脑肌心炎病毒内部核糖体入口部位 (EMCV IRES) 对于独立于帽子的翻译启动至关重要.
  • 现有的EMCV IRES的二次结构模型显示出显著的差异,特别是在域I.
  • 了解EMCV IRES的精确结构对于阐明其翻译机制至关重要.

研究的目的:

  • 为了研究EMCV的结构异质性,IRES领域I.
  • 通过实验方法验证EMCV IRES现有的二次结构模型.
  • 确定特定RNA结构在EMCVIRES介导翻译中的功能重要性.

主要方法:

  • 对现有的EMCV IRES二次结构模型进行比较分析.
  • 局部定向突变分析,以评估特定RNA螺旋体的作用.
  • 选择性2'-基乙化分析通过原料扩展 (SHAPE) 探测,以映射RNA结构.
  • 在体外翻译试验测量以测量IRES活动.

主要成果:

  • 突变分析确定了IRES翻译所必需的域I内的两个关键螺旋区域.
  • 这些功能螺旋与只有一个已发表的二次结构模型保持一致,与现代计算方法的预测相矛盾.
  • SHAPE探测显示,在体外翻译过程中,这些区域受到保护,这表明它们参与了翻译复合体.

结论:

  • 这项研究验证了之前提出的EMCV IRES二次结构模型.
  • 这些发现表明,在EMCV IRES介导的翻译启动过程中,I域内的特定螺旋结构对EMCVIRES介导的翻译启动具有功能意义.
  • 结果强调了I领域在EMCV IRES整体功能中的重要性.