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Electron Transport Chain: Complex III and IV01:43

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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复杂II组件驱动了对OXPHOS功能障碍的代谢适应.

Roopasingam Kugapreethan1, Sheik Nadeem Elahee Doomun2, Joanna Sacharz1

  • 1Department of Biochemistry and Pharmacology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, VIC, Australia.

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概括

SDHAF2蛋白对于细胞通过平衡TCA循环和利用ROS信号来适应急性线粒体功能障碍至关重要. 它的损失会损害生长,而适应细胞无论SDHAF2是否存在都会表现出弹性.

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科学领域:

  • 细胞的新陈代谢
  • 线粒体呼吸 线粒体呼吸
  • 生物化学 生物化学

背景情况:

  • 氧化酸化 (OXPHOS) 功能障碍可以通过逆转酸脱酶 (复合II) 来控制,以保持辅酶Q (Q) - 池氧化还原状态.
  • 复杂II组合因子在细胞适应线粒体压力的作用尚未完全理解.

研究的目的:

  • 为了研究SDHAF2蛋白的作用,一个复杂的II组装因子,在急性线粒体复杂III功能障碍期间的代谢适应.
  • 了解SDHAF2如何影响三碳酸 (TCA) 循环,反应性氧物种 (ROS) 信号传递以及在OXPHOS压力下细胞生长.

主要方法:

  • 利用具有抑制复合III的HEK293T细胞来研究代谢反应.
  • 评估了SDHAF2损失对TCA循环方向性,ROS产生,糖溶性适应和细胞生长的影响.
  • 将SDHAF2-缺乏细胞的代谢表型与在Q-pool压力下适应糖解的细胞进行比较.

主要成果:

  • 在复杂III抑制期间的SDHAF2损失导致了减小的TCA循环,SDHA衍生的ROS信号的损失,不充分的糖溶性适应和严重的生长障碍.
  • 在Q池压力下适应糖解的细胞没有积累SDHAF2,并且无论SDHAF2水平如何,都表现出轻微的生长表型.
  • SDHAF2对于维持TCA循环动态和ROS信号传递至关重要,以克服OXPHOS功能障碍.

结论:

  • SDHAF2蛋白对于细胞代谢适应急性OXPHOS功能障碍至关重要.
  • 通过SDHAF2介导的复杂II组件平衡TCA循环的方向性,保护Q池应力,并实现ROS介导的信号传输.
  • 了解SDHAF2的作用,可以了解细胞的策略,以生存线粒体呼吸应激.