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相关概念视频

Other Glycolytic Pathways01:24

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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
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一个可编程的双向动态开关克服了可逆异构化反应,以实现高效的d-粉生物合成.

Wei Zhang1, Feng Yang1, Shiqiang Yue1

  • 1Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education; Tianjin Key Laboratory of Industrial Microbiology; College of Biotechnology, National Engineering Laboratory for Industrial Enzymes, Tianjin University of Science and Technology, Tianjin 300457, P. R. China.

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概括

研究人员设计了一种新的氧化还原驱动途径,用于单细胞中d-氨酸生物合成. 这种方法克服了热力学限制,使用可编程蛋白质开关实现了罕见的糖d-allulose的高产.

关键词:
D - 氨酸 D - 氨酸 D-氨酸动态调节 动态调节多种酶级联催化剂的催化.在翻译后的法规.基于蛋白酶的可编程工具箱.

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科学领域:

  • 生物技术是生物技术.
  • 代谢工程是代谢工程.
  • 合成生物学 合成生物学

背景情况:

  • 通过D-果糖异构化的d-糖生物合成在热力学上受到限制,导致产量低.
  • 级联反应中的酶不相容性阻碍了有效的d-粉素生产.
  • 开发强大的生物合成途径需要精确控制酶活性和水平.

研究的目的:

  • 在单细胞系统中重新设计一条氧化还原驱动的级联路径,以增强单细胞系统中的d-氨酸生物合成.
  • 利用翻译后蛋白质水平重编程工具来克服酶不兼容性.
  • 建立一个可控制的系统来重新连接反向碳流.

主要方法:

  • 设计了一种基于蛋白质酶的可编程关闭/启动开关工具箱,用于蛋白质水平的重编程.
  • 通过调整 mf-Lon,degron 和压缩器的表达水平来优化关闭/启动开关.
  • 使用热敏调节器控制酶表达,在2小时内精确切换.
  • 在OFF/ON开关的控制下集成的特定酶 (KEase,RDH,FDH,ADH,NOX).

主要成果:

  • 达到了190.7g/L的高d-粉位.
  • 达到95.4%的转换率,显著克服了热力学平衡的限制.
  • 使用优化的关闭/启动模块,证明了同时将蛋白质丰度切换到所需状态.
  • 工程菌株T3通过构建的氧化还原驱动途径成功合成了d-.

结论:

  • 开发的氧化还原驱动级联路径和可编程蛋白开关工具箱使得有效的d-氨酸生物合成成为可能.
  • 这种方法为控制酶水平和重新连接代谢途径提供了一种多功能策略.
  • 该研究展示了翻译后重编程的潜力,以克服微生物系统中的生物合成挑战.