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相关概念视频

Protein Folding01:22

Protein Folding

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Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Conservation of Protein Domains Over Different Proteins02:26

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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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.
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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
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评估蛋白质酸化,AlphaFold3模型和形状变异性之间的关系.

Pathmanaban Ramasamy1,2,3,4, Jasper Zuallaert1,2, Lennart Martens1,2,5

  • 1CompOmics, VIB Center for Medical Biotechnology, VIB, Ghent, Belgium.

Protein science : a publication of the Protein Society
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概括

像AlphaFold这样的深度学习模型很难预测酸化是如何改变蛋白质结构的关键蛋白质修饰. 目前的模型捕捉了主导状态,但错过了关键的酸化诱导的变化,限制了我们对蛋白质功能和疾病的理解.

关键词:
阿尔法Fold3是什么意思形状的多样性 形状的多样性酸化的方法是:光化.后翻译修改 (PTMs) 是指翻译后的修改.蛋白质结构 蛋白质结构

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科学领域:

  • * 分子生物学 * 分子生物学
  • * 结构生物学 * 结构生物学
  • * 计算生物学 * 计算生物学

背景情况:

  • *像酸化这样的翻译后修饰 (PTM) 调节蛋白质功能,并与疾病有关.
  • * 了解PTM驱动的结构变化至关重要,但由于实验数据稀缺和蛋白质动力学受到限制.
  • *深度学习,以AlphaFold为例,已经推进了蛋白质结构预测.

研究的目的:

  • *评估AlphaFold模型预测酸化诱导蛋白质结构多样性的能力.
  • * 评估酸化感知模型是否捕捉到PTM特有的形状变化.
  • * 确定模拟PTM驱动的蛋白质结构景观的挑战.

主要方法:

  • *对AlphaFold 2 (AF2),AlphaFold 3非 (AF3-非) 和AlphaFold 3 (AF3-) 模型进行系统评估.
  • * 实验性衍生蛋白质构造组合的分析.
  • * 模型预测与主导和PTM特定结构状态的比较.

主要成果:

  • *所有评估的AlphaFold模型主要预测了主导蛋白质结构状态.
  • * 模型未能捕捉显著的酸化诱导的形状变化.
  • *AF3-在预测这些变化方面只比AF2和AF3-非略有改善.

结论:

  • *目前的AlphaFold模型在预测PTM驱动的结构动力学,特别是酸化方面存在局限性.
  • *捕捉修饰诱导的构造变异性仍然是一个重大挑战.
  • *需要开发更具适应性的蛋白质结构预测框架.