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The Electron Transport Chain01:30

The Electron Transport Chain

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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.
Inhibitors of the electron transport chain
Rotenone, a widely used pesticide, prevents electron transfer from Fe-S cluster to ubiquinone or Q...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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.
ROS generation is regulated and maintained at moderate levels necessary...
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Electron Transport Chain Components01:29

Electron Transport Chain Components

204
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...
204
Antimicrobial Proteins01:23

Antimicrobial Proteins

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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

8.0K
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...
8.0K
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...
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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
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Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

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電子列車のハイジャック: メナキノン結合抗菌ペプチド

Eilidh J Matheson1, Stephen A Cochrane1

  • 1School of Chemistry and Chemical Engineering, Queen's University Belfast, David Keir Building, Stranmillis Road, Belfast, BT9 5AG, UK.

Chembiochem : a European journal of chemical biology
|August 26, 2025
PubMed
まとめ

抗生物質耐性は 大きな脅威です メナキノン (MK) をメナキノン結合抗菌ペプチド (MBAMPs) で標的化することは,耐性細菌に対する新しい戦略を提供し,その発見と開発の最近の進歩です.

科学分野:

  • 微生物学
  • 薬剤化学
  • 薬物の発見

背景:

  • 抗生物質耐性は 世界的に深刻な健康上の脅威となり 新しい抗菌剤や治療標的の緊急開発を 求めています
  • 細菌の電子伝達体であるメナキノン (MK) は,細菌の電子伝達における重要な役割のため,新しい抗生物質の有望で選択的な標的を表しています.
  • メナキノン結合抗生物質ペプチド (MBAMPs) は,既存の薬剤とは異なる新たな抗生物質クラスとして出現した.

研究 の 目的:

  • MBAMPの分野における最近の進歩をレビューする.
  • MBAMPsの発見,特徴付け,合成,およびメカニズムを理解することを強調します.
  • 抗菌剤耐性に対するMBAMPの潜在力を強調する.

主な方法:

  • MBAMPに関する最近の研究の文献レビュー.
  • 自然と合成のMBAMPsの発見と特徴を詳細に記述した研究の分析.
  • MBAMPsの合成,誘導,およびメカニズム的作用に関する研究の検討.

主要な成果:

  • ライソシンEを含むいくつかのMBAMPが特定され,特徴づけられました.
  • 合成化学の進歩により,MBAMPの作成と変更が可能になりました.
キーワード:
抗生物質抗菌ペプチドメナキノン非リボソームペプチドポリプレニル

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  • MBAMPのメカニズムの理解が深まり,その抗菌作用の洞察が得られます.

    • 結論:

    • MBAMPは耐性病原体に対する抗生物質開発の 新しく有望な道を示しています
    • MBAMPに関するさらなる研究が,その治療的可能性の実現に不可欠です.
    • メナキノンをターゲットにすることで 既存の抗生物質耐性メカニズムを克服する 選択的な戦略が提供されます