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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
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,...
Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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.
Most of the mitochondrial precursors...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...

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Related Experiment Video

Updated: May 22, 2026

Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1
13:15

Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1

Published on: February 25, 2016

Targeting nucleic acids into mitochondria: progress and prospects.

Adnan Khan Niazi1, Daria Mileshina, Anne Cosset

  • 1Institut de Biologie Moléculaire des Plantes, CNRS and Université de Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.

Mitochondrion
|May 22, 2012
PubMed
Summary

Scientists are exploring new ways to deliver DNA and RNA into mitochondria for cell homeostasis and disease treatment. This review covers various strategies for genetic transformation of these vital organelles.

Keywords:
MitochondriaNanocarriersNeurodegenerative diseaseRNA traffickingTransfection

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Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors
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Area of Science:

  • Mitochondrial biology
  • Cellular and molecular biology
  • Genetic engineering

Background:

  • Mitochondria are crucial for cell homeostasis, implicated in incurable diseases.
  • Genetic transformation of mitochondria is a significant challenge, achieved only in limited organisms.
  • Mitochondrial dysfunction has implications for various pathologies and biotechnological applications.

Purpose of the Study:

  • To review current strategies for mitochondrial delivery of DNA or RNA in living cells.
  • To highlight advancements in genetic transformation of mitochondria.
  • To explore the potential of novel RNA-based delivery approaches.

Main Methods:

  • Review of existing scientific literature on mitochondrial genetic delivery.
  • Analysis of diverse strategies for DNA and RNA targeting into mitochondria.
  • Evaluation of the efficacy and potential of different delivery systems.

Main Results:

  • Mitochondrial DNA targeting shows promising results for genetic transformation.
  • Alternative RNA trafficking approaches have been successfully established.
  • Multiple strategies offer potential for advancing mitochondrial gene therapy and biotechnology.

Conclusions:

  • Genetic transformation of mitochondria remains a key goal in cell biology.
  • Both DNA and RNA-based delivery methods are advancing the field.
  • These advancements hold promise for treating mitochondrial diseases and for biotechnological innovation.