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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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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Introduction to Mechanisms of Enzyme Catalysis01:13

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
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通过使用蛋白质语言模型组合多个突变来优化酶热稳定性.

Jiahao Bian1,2, Pan Tan3,4, Ting Nie1,2

  • 1State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai China.

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|January 2, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种人工智能策略,有效地结合有益的突变来提高酶的热稳定性,克服复杂的遗传相互作用的挑战,并加速工业应用的蛋白质工程.

关键词:
组合突变的组合突变.创氨酸酶是什么意思史诗主义就是一种史诗主义.蛋白质语言模型热稳定性 热稳定性

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科学领域:

  • 蛋白质工程是指蛋白质工程.
  • 生物技术是生物技术.
  • 计算生物学 计算生物学

背景情况:

  • 酶的热稳定性对于工业应用和蛋白质科学至关重要.
  • 目前用于增强酶热稳定的方法,如理性设计和随机突变发生,在组合突变中与复杂的表皮性相互作用作斗争.
  • 优化酶通常需要漫长,代的设计过程.

研究的目的:

  • 通过重组有益的单点突变,开发一种人工智能辅助的策略,以高效地设计酶热稳定性.
  • 为了应对高阶组合突变的表观症的挑战.
  • 创建一个更快,更有效的酶设计框架.

主要方法:

  • 利用了肌酸酶热稳定性数据,包括单个到四重突变.
  • 采用温度导向蛋白质语言模型 (Pro-PRIME) 来学习表观特征.
  • 使用人工智能模型设计和生成组合突变物.

主要成果:

  • 在两个设计回合后,在获得50个具有优越热稳定的组合突变物时实现了100%的成功率.
  • 开发了一种突变 (13M4) 具有13种突变,近乎野生类型的活动,化温度增加10.19°C,在58°C时半衰期延长约655倍.
  • 成功建模了包括符号和协同效应在内的高阶表征,并使用动态交叉相关矩阵方法阐明了机制.

结论:

  • 这种人工智能辅助的策略有效地促进了对酶热稳定性有益突变的重组.
  • 该Pro-PRIME模型有效地捕捉了高阶突变的复杂表观效应.
  • 这个框架为蛋白质导向进化和热稳定酶的设计提供了一个强大的工具.