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Related Concept Videos

Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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...
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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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.
Generally, polypeptides are unfolded by two distinct...
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Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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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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Translocation of Proteins into the Mitochondria01:19

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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 Precursor Proteins01:39

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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...
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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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...
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Related Experiment Video

Updated: May 26, 2025

Three-dimensional Imaging and Analysis of Mitochondria within Human Intraepidermal Nerve Fibers
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How are mitochondrial nucleoids trafficked?

Josefa Macuada1, Isidora Molina-Riquelme1, Verónica Eisner1

  • 1Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago, Chile.

Trends in Cell Biology
|February 21, 2025
PubMed
Summary

Mitochondrial DNA (mtDNA) nucleoids move within mitochondria, influencing their distribution and degradation. Understanding this trafficking is key to addressing mitochondrial diseases linked to mtDNA segregation issues.

Keywords:
cristae reshapingmitochondrial nucleoidmtDNA inheritancenucleoid dynamicssphere of influence

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Last Updated: May 26, 2025

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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • Mitochondria contain their own DNA (mtDNA) essential for oxidative phosphorylation (OXPHOS).
  • mtDNA is organized into nucleoids tethered to the inner mitochondrial membrane (IMM) and distributed within the mitochondrial network.
  • Specific nucleoid positioning is crucial for mtDNA segregation and degradation.

Purpose of the Study:

  • To explore mechanisms controlling mitochondrial DNA nucleoid positioning.
  • To investigate the role of intramitochondrial trafficking in nucleoid movement.
  • To connect nucleoid positioning to mitochondrial dysfunction and disease.

Main Methods:

  • This is an opinion article, synthesizing existing research.
  • Focuses on theoretical mechanisms of nucleoid trafficking.
  • Discusses cristae reshaping and intercompartment transport.

Main Results:

  • Nucleoid positioning is influenced by intramitochondrial trafficking.
  • Mechanisms involve cristae dynamics and membrane interactions.
  • Correct positioning impacts mtDNA segregation and selective degradation.

Conclusions:

  • Mitochondrial DNA nucleoid trafficking is a critical process.
  • Understanding these mechanisms offers insights into mitochondrial pathologies.
  • Further research into nucleoid positioning may reveal therapeutic targets for diseases involving mtDNA defects.