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Related Concept Videos

Electron Transport Chain: Complex I and II01:46

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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 Inner Mitochondrial Membrane01:28

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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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 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 Supercomplexes in the Crista Membrane01:41

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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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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,...
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Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Structure and function of mitochondrial complex I.

Christophe Wirth1, Ulrich Brandt2, Carola Hunte1

  • 1Institute for Biochemistry and Molecular Biology, ZBMZ, BIOSS Centre for Biological Signalling Studies, University of Freiburg, Germany.

Biochimica Et Biophysica Acta
|February 28, 2016
PubMed
Summary
This summary is machine-generated.

Mitochondrial complex I, a key enzyme in cellular respiration, has revealed its intricate structure and function through recent studies. Understanding its mechanisms is crucial for addressing diseases linked to its dysfunction.

Keywords:
Electron microscopyMembrane proteinOxidative phosphorylationProton pumpUbiquinoneX-ray crystallography

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Proton-pumping NADH:ubiquinone oxidoreductase (complex I) is the largest enzyme in the respiratory chain, essential for cellular energy production.
  • Complex I dysfunction is implicated in various hereditary and degenerative diseases, and it generates reactive oxygen species (ROS).

Purpose of the Study:

  • To review recent advancements in the structural determination and functional analysis of mitochondrial complex I.
  • To elucidate the roles of accessory subunits and the mechanisms of energy conversion and regulation within complex I.

Main Methods:

  • Review of recent structural data, including X-ray crystallography.
  • Analysis of functional data related to substrate binding, redox centers, proton pumping, and conformational changes.

Main Results:

  • Structures reveal spatial separation of redox reactions and proton pumping, with ubiquinone reduction occurring in a buried site.
  • X-ray structure of Yarrowia lipolytica complex I supports a two-state stabilization change mechanism for proton pumping.
  • Structural rearrangements are proposed to explain active/deactive transitions, suggesting an integrated regulatory model.

Conclusions:

  • Recent structural and functional insights enhance our understanding of complex I's mechanism of energy conversion and regulation.
  • Further research into accessory subunits and detailed structural assignments is needed.
  • The findings provide a foundation for understanding complex I-related diseases and developing therapeutic strategies.