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関連する概念動画

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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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
5.6K
Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

9.0K
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...
9.0K
Structure of Porins01:21

Structure of Porins

3.8K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
3.8K
Mitochondrial Membranes01:45

Mitochondrial Membranes

16.5K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
16.5K
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

4.5K
Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
4.5K

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関連する実験動画

Updated: Jan 7, 2026

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
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ヒトミトコンドリア複合体IおよびIIIに対するコンセンサスドッキングアプローチの活用

Karin Grillberger1, Viktoria Magel2, Marcel Leist2

  • 1Department of Pharmaceutical Sciences, University of Vienna, Josef-Holaubek-Platz 2, Vienna 1090, Austria.

Chemical research in toxicology
|December 30, 2025
PubMed
まとめ

構造ベースの分子ドッキングは、化合物の危険性をランク付けすることにより、毒性を効果的に予測します。特にコンセンサススコアリングは、従来のQSARでは見逃されがちな活性クリフのような課題に対処し、より安全な化学化合物の優先順位付けを支援します。

キーワード:
分子ドッキング毒性予測コンセンサススコアリング活性クリフミトコンドリア複合体構造ベースのモデリング計算化学安全性評価

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Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Author Spotlight: Unveiling Oxidative Phosphorylation System Dynamics and Mitochondrial Roles in Health and Disease
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科学分野:

  • 計算化学
  • 毒物学
  • 創薬

背景:

  • 分子ドッキングのような構造ベースの方法は、毒性予測において十分に活用されていません。
  • 従来の定量的構造活性相関(QSAR)法は、立体異性による活性クリフのような課題に対処するのに苦労しています。

研究 の 目的:

  • ヒトミトコンドリア複合体IおよびIII(CI、CIII)を標的とする化合物の毒性を予測するための分子ドッキングスコアリング関数および相互作用フィンガープリントの評価。
  • これらの構造ベースの方法が、活性クリフの特定および化合物の安全性に関する優先順位付けに有用であるかどうかの評価。

主な方法:

  • 結合部位の柔軟性をモデル化するための誘起適合ドッキングプロトコル。
  • 様々なドッキングスコアリング関数およびタンパク質-リガンド相互作用フィンガープリントの適用。
  • 再スコアリングのための結合エネルギー最小化。
  • 実験データおよびinvitro試験とのランク相関の分析。

主要な成果:

  • 個々のドッキングスコアリングとコンセンサスドッキングスコアリングの両方で、CIIIの実験データとのランク相関が許容範囲内であることが示されました。
  • コンセンサス相互作用フィンガープリントは、CIIIにおける阻害剤サブタイプを区別しました。
  • invitro試験により、CIにおけるE-/Z-フェンピロキシメートの異性化依存性活性クリフが確認されました。

結論:

  • コンセンサスドッキングおよびスコアリングは、予測される結合親和性に基づいて化合物を優先するための有用なスクリーニングツールとして機能します。
  • これらの構造ベースのアプローチは、特に立体異性駆動型活性クリフのような複雑なケースにおいて、毒性予測を強化します。