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相关概念视频

tRNA Activation02:26

tRNA Activation

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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Repressible Operon: trp Operon01:21

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The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
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Amino Acid Biosynthetic Pathways01:29

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Transfer RNA Synthesis02:36

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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
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Allosteric Proteins-ATCase01:19

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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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相关实验视频

Updated: Jan 17, 2026

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase
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PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

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基于序列的生成AI设计多功能托合成酶.

Théophile Lambert1,2, Amin Tavakoli3, Gautham Dharuman4

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA, USA.

Nature communications
|January 14, 2026
PubMed
概括

生成性蛋白质语言模型可以创建新的酶,如托合成酶β子单元 (TrpB),它们是稳定的,活跃的,甚至比自然酶更强. 这一突破加速了生物催化剂的发现和工程,以实现可持续的应用.

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相关实验视频

Last Updated: Jan 17, 2026

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科学领域:

  • 生物化学 生物化学
  • 蛋白质工程是指蛋白质的工程.
  • 计算生物学 计算生物学

背景情况:

  • 酶的发现和优化对可持续化学至关重要,但在确定合适的起点时面临瓶.
  • 设计多样化和功能化的酶库仍然是生物催化剂的重大挑战.

研究的目的:

  • 利用蛋白质语言模型 (GenSLM) 来生成新型的托合成酶 (TrpB) 酶的β子单元.
  • 评估这些生成的TrpB酶的稳定性,催化活性和基质杂交性.
  • 展示生成模型在生物催化剂发现和工程中的潜力.

主要方法:

  • 应用GenSLM蛋白语言模型来设计新的TrpB酶序列.
  • 在大肠杆菌中生成的TrpB酶的表达和表征.
  • 在原生和非原生基质上评估酶稳定性,催化活性和基质杂交.

主要成果:

  • 成功生成了新的TrpB酶,可以表达大肠杆菌中的功能蛋白质.
  • 许多产生的TrpBs表现出高稳定性和催化活性.
  • 观察到显著的基质乱交,其中一些变体的表现优于天然的TrpB,甚至是实验室进化的酶.
  • 与天然同类物质的比较证实,产生的酶获得了非自然性质.

结论:

  • 生成性蛋白质语言模型可以创建可以保留自然功能的酶,同时获得新的特性.
  • 这些模型代表了加速生物催化剂发现和工程的强大工具.
  • 生成的TrpBs表现出增强的多功能性,为酶应用开辟了新的途径.