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Related Concept Videos

Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
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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 outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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Updated: Sep 7, 2025

Author Spotlight: High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
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Monitoring DNA polymerase β mitochondrial localization and dynamics.

Julie K Horton1, Agnes K Janoshazi2, Cristina A Nadalutti1

  • 1Genome Integrity and Structural Biology Laboratory, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA.

DNA Repair
|June 19, 2022
PubMed
Summary
This summary is machine-generated.

DNA polymerase β (pol β) is recruited to mitochondria to repair oxidative damage to mitochondrial DNA (mtDNA). This recruitment is concentration-dependent and increases following exposure to hydrogen peroxide, suggesting a role in mtDNA maintenance.

Keywords:
DNA damageDNA polymerase βDNA repairLaser micro-irradiationMitochondriaMitochondrial DNAMitochondrial nucleoids

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • DNA polymerase β (pol β) is crucial for DNA repair.
  • Mitochondrial DNA (mtDNA) is susceptible to oxidative damage.
  • The role of pol β in mitochondria remains largely unexplored.

Purpose of the Study:

  • To investigate the subcellular localization and dynamics of pol β in living cells.
  • To determine the relationship between pol β concentration and mitochondrial localization.
  • To examine pol β recruitment to mitochondria in response to oxidative stress and mtDNA damage.

Main Methods:

  • Transfection of mouse fibroblasts with fluorescently tagged pol β.
  • Confocal microscopy for live-cell imaging and colocalization studies.
  • Micro-irradiation and hydrogen peroxide treatment to induce DNA damage.
  • ELISA for quantifying oxidative base lesions in mtDNA.

Main Results:

  • Pol β localization to mitochondria is concentration-dependent.
  • Elevated pol β levels correlate with tubular mitochondrial appearance and potential mtDNA repair.
  • Oxidative stress (H₂O₂) induces time-dependent pol β increase in cytoplasm and colocalization with mitochondria.
  • Hydrogen peroxide treatment increases oxidative mtDNA damage, specifically 7,8-dihydro-8-oxoguanine.

Conclusions:

  • Pol β is recruited to mitochondria in response to oxidatively induced mtDNA damage.
  • The findings suggest a role for pol β in the repair of mtDNA lesions.
  • Pol β's dynamic localization highlights its adaptability in cellular DNA maintenance pathways.