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Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

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Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Chemiosmosis

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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
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There are various methods for the preparation of carboxylic acids. For example, oxidation of primary alcohols or aldehydes using strong oxidizing agents results in a carboxylic acid.  Aldehydes can also be oxidized in the presence of mild oxidizing agents.
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The cells of most organisms—including plants and animals—obtain usable energy through aerobic respiration, the oxygen-requiring version of cellular respiration. Aerobic respiration consists of four major stages: glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. The third major stage, the citric acid cycle, is also known as the Krebs cycle or tricarboxylic acid (TCA) cycle.
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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科学领域:

  • 合成生物学 合成生物学
  • 代谢工程是代谢工程.
  • 微生物生物技术 微生物生物技术

背景情况:

  • 稳定的增值产品生产需要强大的微生物生物催化剂.
  • 多拷贝表达等离子体对高滴度生物合成有利,但在长期培养过程中往往不稳定.
  • 库普里亚维杜斯 (Cupriavidus necator H16) 可以将二氧化碳转化为产品,但难以保持等离子体的稳定性,限制了工业应用.

研究的目的:

  • 设计和实施等离子体成系统,以提高Cupriavidus necator H16.16中的多复制等离子体稳定性.
  • 为了从二氧化碳中实现增值化学品的稳定生产,使用工程化C. necator H16.

主要方法:

  • 基于基本基因的补充的等离子体成系统的开发.
  • 实施一个利用RubisCO缺乏突变体的补充来固定二氧化碳的系统.
  • 设计用于生产美酸盐的美酸盐路径操作子 (MvaES).

主要成果:

  • 基于RubisCO补充的等离子体成系统成功稳定了C. necator H16.16中的多复制等离子体.
  • 使用稳定等离子体来表达甲酸盐路径操作子 (MvaES) 的结果大约为10 g/L的甲酸盐.
  • 从二氧化碳中获得大约25%的碳产量,用于从二氧化碳中生产甲酸盐.

结论:

  • 等离子体成系统有效地稳定了工业生物工艺中C.necator H16中的多副本等离子体.
  • 这项研究证明了C1原料 (CO2) 中C6化合物的最高报告标位和产量.
  • 开发的系统增强了C. necator H16作为可持续化学生产的微生物底盘的潜力.