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関連する概念動画

Redox Reactions01:24

Redox Reactions

50.9K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Electron Transport Chains01:28

Electron Transport Chains

86.0K
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...
86.0K
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

8.1K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
8.1K
Coupled Reactions01:17

Coupled Reactions

7.8K
Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
Energy in adenosine triphosphate or ATP molecules is easily accessible to do work. ATP powers the majority of energy-requiring cellular reactions....
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Redox Reactions01:27

Redox Reactions

1.2K
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
1.2K
Electron Transport Chain Components01:29

Electron Transport Chain Components

1.2K
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...
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Characterizing Electron Transport through Living Biofilms
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Characterizing Electron Transport through Living Biofilms

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電子伝送連鎖における可逆リドックスエネルギーカップリング

Artur Osyczka1, Christopher C Moser, Fevzi Daldal

  • 1The Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA.

Nature
|February 13, 2004
PubMed
まとめ

この研究は,シトクロームbc1のエネルギー結合におけるミリ秒の可逆性を明らかにし,既存のモデルに挑戦しています. 2つのメカニズム,形状ゲーティングまたは協調した2電子化学は,この重要なプロセスにおける短路を防止します.

科学分野:

  • バイオケミストリーとバイオ物理学
  • バイオエネルギー学 バイオエネルギー学
  • 電子伝送システムは電子伝送システムです.

背景:

  • リバーシビリティは,生物学的エネルギー伝導,特に呼吸器系および光合成系において極めて重要です.
  • サイトクロームbc1複合体は,エネルギーカップリングの中心であり,キノンとサイトクロームcの間の電子移転を触媒化する.
  • 効率的で可逆的なエネルギー結合のメカニズムを理解することは,細胞のエネルギー生産を理解するために不可欠です.

研究 の 目的:

  • サイトクロームbc1複合体内の個々のコファクターの可逆性を調査する.
  • 触媒時間スケールで効率的かつ可逆的なエネルギー結合を可能にするメカニズムを解明する.
  • Q ((o) サイトでのキノン触媒の既存のモデルに挑戦し,精錬する.

主な方法:

  • サイトクロームbc1複合体内の個々のコファクターの漸進的な無活性化.
  • 電子トンネルと陽子交換におけるミリ秒時間スケールの可逆性の解像度.
  • Q ((o)) 部位における電荷分離ヒドロキノン・キノン触媒の分析.

主要な成果:

  • ミリ秒の可逆性は,すべての電子トンネリングステップとカップリングされた陽子交換で観察されました.

さらに関連する動画

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1

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Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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  • Q ((o)) 部位での急速な可逆性は,触媒時間スケールにおける酸化還元均衡の関連性を示している.
  • セミキノン中間物質に基づく既存のモデルは,潜在的な短路故障のために挑戦されています.

    • 結論:

    • 2つの異なるメカニズムで,セミキノンまたは協調した2電子キノン化学の適合ゲート化により,可逆的な機能が可能になる.
    • これらのメカニズムは,より遅い,長距離の電子トンネリング (秒間スケール) に置き換えることで,短路を防止します.
    • この発見は,生物学的エネルギー伝導のダイナミックで可逆的な性質についての重要な洞察を提供します.