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Related Concept Videos

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...
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 Membranes01:45

Mitochondrial Membranes

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
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...
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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Updated: May 13, 2026

Optimized Automated Analysis of Live Neuronal Mitochondria Homeostasis Modulation by Isoform-Specific Retinoic Acid Receptors
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A systems approach for decoding mitochondrial retrograde signaling pathways.

Sehyun Chae1, Byung Yong Ahn, Kyunghee Byun

  • 1School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.

Science Signaling
|February 28, 2013
PubMed
Summary
This summary is machine-generated.

Mitochondrial dysfunction triggers retrograde signaling. Researchers identified a pathway involving retinoid X receptor alpha (RXRA) that worsens oxidative phosphorylation defects, revealing key players in cellular communication.

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Area of Science:

  • Cellular Biology
  • Mitochondrial Biology
  • Molecular Biology

Background:

  • Mitochondrial dysfunctions activate retrograde signaling pathways, communicating stress from mitochondria to the nucleus.
  • Understanding these signaling pathways is crucial for deciphering cellular responses to mitochondrial damage.

Purpose of the Study:

  • To identify transcription factors and pathways involved in mitochondrial retrograde signaling.
  • To investigate the role of specific mutations in mitochondrial DNA on cellular signaling.

Main Methods:

  • Gene expression profiling of cells with a specific mitochondrial DNA mutation (A3243G in tRNA(Leu)).
  • Analysis of transcription factors regulating differentially expressed genes.
  • Experimental validation of identified signaling pathways.

Main Results:

  • Identified 72 potential transcription factors involved in mitochondrial retrograde signaling.
  • Validated a pathway involving retinoid X receptor alpha (RXRA), reactive oxygen species, c-JUN N-terminal kinase (JNK), and peroxisome proliferator-activated receptor gamma, coactivator 1 alpha (PGC1α).
  • This RXR pathway exacerbates oxidative phosphorylation dysfunction.

Conclusions:

  • Matching transcription factors to gene expression profiles is effective for understanding mitochondrial retrograde signaling.
  • The identified RXR pathway plays a significant role in aggravating mitochondrial dysfunction.