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関連する概念動画

Electron Transport Chain Components01:29

Electron Transport Chain Components

826
The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
826
Electron Transport Chains01:28

Electron Transport Chains

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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.
The ETC is comprised of...
111.2K
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

8.9K
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...
8.9K
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

18.3K
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.
ROS generation is regulated and maintained at moderate levels necessary...
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The Supercomplexes in the Crista Membrane01:41

The Supercomplexes in the Crista Membrane

2.9K
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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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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Updated: Jan 4, 2026

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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バクテリア細胞表面マルチヘム電子導体を通過するスピン依存電子輸送

Suryakant Mishra1, Sahand Pirbadian2, Amit Kumar Mondal1

  • 1Department of Chemical and Biological Physics , Weizmann Institute of Science , Rehovot 76100 , Israel.

Journal of the American Chemical Society
|November 9, 2019
PubMed
まとめ

細菌の外膜の細胞染色体を通しての電子輸送はスピン選択性であり,これは微生物のエネルギー代謝とバイオ電子装置に影響を及ぼします. このスピン・セレクティビティは バイオティック・アビオティック・インターフェースの 電子の流れに影響します

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関連する実験動画

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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Characterizing Electron Transport through Living Biofilms
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科学分野:

  • 微生物電気化学とバイオエネルギー
  • 電子移転の生体物理学
  • ナノ材料とバイオセンシング

背景:

  • バクテリアの外膜マルチヘム・サイトクロームは,長距離 (> 10 nm) の細胞外電子移転を促進する.
  • これらの細胞染色体は,鉱物や電極のような外部電子受容体と細胞内代謝を結びつける.
  • キラル誘発スピン選択性 (CIS) は,バイオ分子における効率的なスピン依存電子輸送のための提案されたメカニズムである.

研究 の 目的:

  • スピンの選択性が細菌の細胞外電子伝導に 影響するかどうかを調査する.
  • デカヘム細胞染色体MtrFとOmcAの機能におけるキラル誘発のスピン選択性の役割を調査する.

主な方法:

  • 原子力顕微鏡を用いた 磁導探査機
  • ホール電圧の測定を行った.
  • *Shewanella oneidensis* MR-1から浄化されたMtrFとOmcAでスピン依存電気化学を行った.

主要な成果:

  • デカヘム・サイトクロームMtrFとOmcAによる電子輸送がスピン選択的であることが実証された.
  • これらの微生物の細胞外導体におけるスピン依存の電子移転の実験的証拠を提供した.

結論:

  • 細菌のサイトクロームによって媒介される細胞外電子移転は,キラル誘発のスピン選択性を示す.
  • 発見は,スピン依存の相互作用と磁場が,バイオティック-アビオティックインターフェイスで電子輸送を制御することを示唆しています.
  • 微生物の呼吸を理解し,新しいバイオエレクトロニクス技術の開発への影響