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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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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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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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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Author Spotlight: Mitochondrial Remodeling in Skeletal Muscle
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Mitochondrial Network: Electric Cable and More.

Polina A Abramicheva1, Nadezda V Andrianova1, Valentina A Babenko1,2

  • 1Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia.

Biochemistry. Biokhimiia
|December 17, 2023
PubMed
Summary

Mitochondrial networks act as intracellular electrical wires, rapidly delivering energy for ATP synthesis. This review explores their role in cellular energy distribution, redox potential maintenance, and associated pathologies.

Keywords:
cardiomyocyteselectricityfetal growth retardationfissionfragmentationmembrane potentialmitochondrianetworkoxidative stresspreeclampsiaredoxreticulumspermatozoa

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Area of Science:

  • Cell Biology
  • Bioenergetics
  • Mitochondrial Dynamics

Background:

  • Mitochondria form extensive networks crucial for cellular energy supply via ATP synthesis.
  • Chemiosmotic theory explains energy storage as an electrical potential across the inner mitochondrial membrane.
  • Extended mitochondrial structures may function as intracellular electrical cables.

Purpose of the Study:

  • To review the history and unsolved problems of mitochondrial cable theory.
  • To explore the restructuring of mitochondrial networks and the role of oxidative stress.
  • To propose additional functions of mitochondrial networks, including redox potential maintenance.

Main Methods:

  • Analytical review of existing literature.
  • Discussion of historical cable theory.
  • Examination of mitochondrial network dynamics and oxidative stress.

Main Results:

  • Mitochondrial networks facilitate rapid electrical energy delivery throughout the cell.
  • This electrical energy is used for accelerated ATP synthesis compared to diffusion.
  • Mitochondrial network organization (fragmentation/fusion) influences cellular redox potential.

Conclusions:

  • Mitochondrial networks function as intracellular electrical cables, optimizing energy distribution.
  • Mitochondrial networks play a role in maintaining cellular redox homeostasis.
  • Dysfunctional mitochondrial networks are implicated in various pathologies affecting redox status.