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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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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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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 Membranes01:45

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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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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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Updated: Dec 10, 2025

Simultaneous Measurement of Mitochondrial Calcium and Mitochondrial Membrane Potential in Live Cells by Fluorescent Microscopy
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Translatable mitochondria-targeted protection against programmed cardiovascular dysfunction.

K J Botting1,2,3, K L Skeffington1,3, Y Niu1,2,3

  • 1Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3EG, UK.

Science Advances
|September 3, 2020
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Summary
This summary is machine-generated.

Prenatal hypoxia programs offspring heart disease via mitochondrial oxidative stress. Antioxidant MitoQ intervention during development prevents this risk by enhancing nitric oxide signaling.

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Area of Science:

  • Cardiovascular Science
  • Developmental Biology
  • Mitochondrial Medicine

Background:

  • Prenatal origins of heart disease are known, but human-comparable models are lacking.
  • Developmental hypoxia is a common pregnancy complication with long-term cardiovascular risks.
  • Translational research requires models with similar cardiovascular developmental milestones to humans.

Purpose of the Study:

  • To investigate cardiovascular dysfunction programmed by developmental hypoxia in sheep and chickens.
  • To test mitochondria-targeted antioxidant MitoQ as an intervention against hypoxia-induced cardiovascular risks.
  • To elucidate the molecular mechanisms underlying hypoxia-induced cardiovascular programming.

Main Methods:

  • In vivo and in vitro studies across organ, cellular, mitochondrial, and molecular levels.
  • Surgical techniques in sheep for fetal and adult cardiovascular function assessment.
  • Chicken embryo models to isolate developmental effects from maternal/placental influences.
  • MitoQ administration during hypoxic development.

Main Results:

  • Developmental hypoxia generates mitochondria-derived oxidative stress.
  • Hypoxia programs endothelial dysfunction and hypertension in adult offspring.
  • MitoQ treatment during development protected against cardiovascular risks.
  • Enhanced nitric oxide signaling was observed in MitoQ-treated offspring.

Conclusions:

  • Developmental hypoxia programs adult cardiovascular dysfunction through mitochondrial oxidative stress.
  • MitoQ is a potential therapeutic strategy to prevent prenatal hypoxia-induced heart disease.
  • Enhanced nitric oxide signaling mediates the protective effects of MitoQ.