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Lipid Catabolism01:25

Lipid Catabolism

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Overview of Fatty Acid Metabolism01:28

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Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
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Bile01:19

Bile

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Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
Bile is released when dietary fats enter...
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Respiration Pathways01:26

Respiration Pathways

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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Hepatic Drug Excretion: Enterohepatic Cycling01:17

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Enterohepatic cycling involves the active secretion of drugs and their metabolites into the bile via transporters in the canalicular membrane of hepatocytes. This secretion is an integral part of the digestive process, releasing these substances into the gastrointestinal (GI) tract.
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Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
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Using Multi-fluorinated Bile Acids and In Vivo Magnetic Resonance Imaging to Measure Bile Acid Transport
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腸内微生物群による胆酸脱酸化のための代謝経路

Masanori Funabashi1,2, Tyler L Grove3, Min Wang1

  • 1Department of Bioengineering and ChEM-H, Stanford University, Stanford, CA, USA.

Nature
|June 20, 2020
PubMed
まとめ
この要約は機械生成です。

研究者らは,二次性胆酸であるデオキシコール酸 (DCA) とリトコール酸 (LCA) の完全な生物合成経路を明らかにした. この画期的な発見により 治療用途の重要な腸内代謝物の 微生物による製造が可能になりました

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Measurement of Fatty Acid &#946;-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes
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科学分野:

  • 微生物学
  • メタボリック・エンジニアリング
  • 生物化学

背景:

  • 腸内微生物群は,デオキシコール酸 (DCA) やリトコール酸 (LCA) などの二次胆酸を含む必須分子を産生します.
  • DCAとLCAは,代謝と病気に影響を及ぼし,宿主の生理に著しく影響を与えますが,それらの生合成経路は不完全でした.
  • 遺伝的ツールの欠如は 微生物の二次胆酸生成の調節を妨げました

研究 の 目的:

  • DCAとLCAの生物合成経路を完全に解明する.
  • 二次性胆酸合成に関与する酵素を特徴づける.
  • DCAとLCAの異質生産のための微生物宿主を設計する.

主な方法:

  • 酵素経路の無酸素 in vitro 再構成
  • コリック酸をDCAに変換する6つの鍵となる酵素の特徴
  • *Clostridium sporogenes*におけるDCA/LCA経路の異質表現

主要な成果:

  • コーリック酸からDCAへの完全な8段階の経路が確立され,新しいA-Bリング改変戦略が含まれています.
  • 6つの酵素のセットは,DCAの合成に必要で十分であると特定された.
  • エンジニアリングされた *Clostridium sporogenes* はDCAとLCAを成功裏に生成し,異質経路の発現と制御を示した.

結論:

  • この研究は,DCAとLCAのバイオシンセシスの完全な理解を提供します.
  • この研究により 微生物による二次胆酸の生成を 工学的に可能にした.
  • この発見は様々な疾患における 胆酸のプールの 治療的調節への道を開く.