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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,...
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...
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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...
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...
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...

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Related Experiment Video

Updated: Jun 17, 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

Targeted nucleic acid delivery to mitochondria.

Bhuvaneshwar Vaidya1, Neeraj Mishra, Devyani Dube

  • 1Drug Delivery Research Laboratory, Department of Pharmaceutical Sciences, Dr. H. S. Gour University, Sagar-470003, India.

Current Gene Therapy
|December 22, 2009
PubMed
Summary
This summary is machine-generated.

Mitochondrial DNA (mtDNA) mutations cause various diseases. This review explores challenges and strategies for delivering therapeutic nucleic acids safely and effectively to mitochondria.

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Related Experiment Videos

Last Updated: Jun 17, 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

High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
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Published on: May 5, 2023

Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly
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Mitochondrial Transformation in Baker's Yeast to Study Translation and Respiratory Complex Assembly

Published on: June 7, 2024

Area of Science:

  • Mitochondrial genetics and modern therapeutics.

Background:

  • Mitochondrial DNA encodes 13 essential polypeptides for ATP generation via oxidative phosphorylation.
  • Mutations in mitochondrial genes are linked to neurodegenerative diseases, diabetes, and cancer.
  • Maintaining mutation-free mitochondrial DNA is crucial for cellular health.

Purpose of the Study:

  • To review the challenges and strategies for delivering nucleic acids to mitochondria for therapeutic purposes.
  • To discuss barriers, internalization processes, and targeted delivery methods for mitochondrial DNA therapeutics.

Main Methods:

  • Review of current literature on mitochondrial genetics, diseases, and nucleic acid delivery systems.
  • Analysis of barriers to intracellular and intramitochondrial nucleic acid delivery.
  • Discussion of various delivery strategies and targeting methods.

Main Results:

  • Mitochondrial DNA defects are implicated in significant human diseases.
  • Effective delivery of nucleic acids to mitochondria faces numerous biological barriers.
  • Development of suitable carrier systems is essential for successful mitochondrial DNA-based therapies.

Conclusions:

  • Nucleic acid-based therapeutics targeting mitochondria represent a promising, yet challenging, frontier in medicine.
  • Overcoming delivery barriers is key to realizing the therapeutic potential of mitochondrial DNA interventions.
  • Further research into novel carrier systems and delivery strategies is warranted.