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Related Concept Videos

Mitochondrial Membranes01:45

Mitochondrial Membranes

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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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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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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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The electron transport chain is a critical component of cellular respiration, occurring in the inner mitochondrial membrane. It facilitates the transfer of high-energy electrons from reduced cofactors NADH and FADH₂ to molecular oxygen, the final electron acceptor. This transfer of electrons through a series of protein complexes is tightly coupled to the translocation of protons across the membrane, generating a proton gradient essential for ATP synthesis.Electron Flow and Proton...
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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: Apr 10, 2026

A Faster, High Resolution, mtPA-GFP-based Mitochondrial Fusion Assay Acquiring Kinetic Data of Multiple Cells in Parallel Using Confocal Microscopy
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Does Mitochondrial Fusion Require Transmembrane Potential?

I E Karavaeva1, K V Shekhireva, F F Severin

  • 1Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, 119992, Russia.

Biochemistry. Biokhimiia
|June 15, 2015
PubMed
Summary
This summary is machine-generated.

Transmembrane potential does not directly regulate mitochondrial fusion. Instead, it influences the NTP/NDP ratio, which then controls the fusion process, ensuring proper mitochondrial network maintenance.

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Area of Science:

  • Cell Biology
  • Mitochondrial Dynamics
  • Autophagy

Background:

  • Mitochondrial fusion integrates damaged mitochondria into the network; loss of transmembrane potential inhibits this.
  • Damaged mitochondria are typically removed via autophagy.
  • The direct role of transmembrane potential in regulating mitochondrial fusion machinery is unclear.

Purpose of the Study:

  • To investigate whether transmembrane potential directly regulates mitochondrial fusion.
  • To explore the relationship between mitochondrial integrity, fusion, and transmembrane potential.

Main Methods:

  • Analysis of mitochondrial fragmentation upon ATP-synthase inhibition while preserving transmembrane potential.
  • Observation of mitochondrial fusion capabilities in yeast and metazoan cells under depolarized conditions.

Main Results:

  • Inhibition of ATP-synthase causes mitochondrial fragmentation without affecting transmembrane potential.
  • Yeast mitochondria can fuse even without transmembrane potential.
  • Metazoan mitochondria may retain fusion ability briefly in a depolarized state.

Conclusions:

  • Transmembrane potential likely does not directly regulate mitochondrial fusion machinery.
  • Regulation may occur indirectly via the mitochondrial NTP/NDP ratio.
  • This indirect regulation prevents the reintegration of mitochondria with damaged ATP-synthase, avoiding deleterious mtDNA mutation expansion.