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相关概念视频

Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Protein Organization01:24

Protein Organization

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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.
The primary structure of a protein is its amino acid sequence....
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Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Physiological Pharmacokinetic Models: Assumption with Protein Binding01:13

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Physiological models with protein binding in pharmacokinetics offer a sophisticated approach to understanding drug disposition. These models consider drug-protein interactions, enabling them to effectively predict drug concentrations in different organs and tissues. This precision aids in accurate drug dosing, providing a significant advantage over conventional models. A key process within these models is equilibration, which ensures that drug concentrations achieve a steady state within the...
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Improving Translational Accuracy02:07

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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相关实验视频

Updated: Jul 19, 2025

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
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结构信息化蛋白质语言模型是对变异效应的可靠预测器.

Yuanfei Sun1, Yang Shen1,2,3

  • 1Department of Electrical and Computer Engineering, Texas A&M University, College Station, 77843, Texas, USA.

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|August 14, 2023
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概括
此摘要是机器生成的。

结构信息化的蛋白质语言模型 (SI-pLMs) 通过结合结构上下文来改善变异效应预测. 这种方法提高了不需要实验标签的准确性,克服了仅序列模型的局限性.

关键词:
变量效应预测变量效应的预测.多模式机器学习.蛋白质语言模型的模型蛋白质序列中的蛋白质序列.蛋白质结构 蛋白质结构

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科学领域:

  • 计算生物学 计算生物学
  • 机器学习 机器学习
  • 蛋白质工程是指蛋白质工程.

背景情况:

  • 预测蛋白质变异效应至关重要,但由于稀缺的实验数据而受到限制.
  • 现有的蛋白质语言模型 (pLMs) 预测了无标签的变异效应,但将生物背景边缘化.
  • 在pLM中的序列和结构意识影响预测的准确性,在过度微调中观察到的权衡.

研究的目的:

  • 开发一个框架,将蛋白质结构上下文纳入pLMs.
  • 为了提高蛋白质变异效应的预测准确度.
  • 创建适用于现有的仅序列模型的结构信息化的pLM (SI-pLM).

主要方法:

  • 引入了一个结构信息化的pLMs (SI-pLMs) 框架,通过将掩盖序列denoising扩展到跨模式denoising.
  • SI-pLMs使用模型架构和培训目标修改仅序列的pLMs,在培训期间使用结构作为上下文和调整器.
  • 在深度突变发生性扫描基准上评估SI-pLMs.

主要成果:

  • SI-pLM与竞争方法 (包括其他pLM) 相比,表现强.
  • 在不同进化信息含量和过拟合倾向的蛋白质家族中,性能是一致的.
  • 在结构上下文中学习的分布增强了序列分布,以改善变异效应预测.

结论:

  • 结构知情的plm有效地注入和利用蛋白质结构上下文,以增强变体效应预测.
  • SI-pLMs提供了一种强大而通用的方法,克服了仅序列模型的局限性.
  • 结构信息的整合提高了蛋白质语言模型的预测能力.