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Related Concept Videos

Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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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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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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.
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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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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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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Assessment of Open Probability of the Mitochondrial Permeability Transition Pore in the Setting of Coenzyme Q Excess
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Cell-permeable protein therapy for complex I dysfunction.

Salvatore Pepe1, Robert M Mentzer, Roberta A Gottlieb

  • 1Heart Research, Murdoch Children's Research Institute, The Royal Children's Hospital, Melbourne, Australia.

Journal of Bioenergetics and Biomembranes
|July 10, 2014
PubMed
Summary
This summary is machine-generated.

Treating complex I deficiency is challenging. Yeast-derived internal NADH quinone oxidoreductase (Ndi1) delivered as Tat-Ndi1 shows promise in replacing damaged complex I function.

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Area of Science:

  • Biochemistry
  • Mitochondrial Biology
  • Gene Therapy

Background:

  • Complex I deficiency presents significant treatment challenges due to the enzyme's intricate structure.
  • Mitochondrial genome mutations are currently untreatable with gene therapy.

Purpose of the Study:

  • To discuss current and future therapeutic strategies for complex I disorders.
  • To explore the potential of yeast-derived internal NADH quinone oxidoreductase (Ndi1) as a treatment.

Main Methods:

  • Review of existing literature on complex I deficiencies and therapeutic approaches.
  • Analysis of animal studies investigating the efficacy of Tat-Ndi1.

Main Results:

  • Tat-Ndi1, a cell-permeable recombinant protein, can functionally substitute for damaged Complex I.
  • Successful replacement of Complex I function in models of ischemia/reperfusion injury.

Conclusions:

  • Tat-Ndi1 represents a promising therapeutic candidate for complex I deficiencies.
  • Further research into Tat-Ndi1 delivery and efficacy is warranted for clinical application.