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Related Concept Videos

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,...
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 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...
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...
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,...
Regulation of Metabolism01:19

Regulation of Metabolism

Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...

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Preparation of Mitochondrial Enriched Fractions for Metabolic Analysis in Drosophila
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Published on: September 30, 2015

Mitochondrial metabolites: undercover signalling molecules.

Christian Frezza1

  • 1MRC Cancer Unit , University of Cambridge , Cambridge , UK.

Interface Focus
|April 7, 2017
PubMed
Summary

Mitochondrial metabolites, particularly from the tricarboxylic acid cycle, act as signaling molecules. They influence cellular functions and epigenetic changes, offering a new view of mitochondrial metabolism in disease.

Keywords:
metabolismmitochondriasignalling

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Area of Science:

  • Cellular metabolism and signaling
  • Mitochondrial biochemistry
  • Epigenetics

Background:

  • Mitochondria are central metabolic hubs producing adenosine triphosphate (ATP).
  • Mitochondria also function as signaling platforms via calcium fluxes, free radicals, and protein release.
  • Emerging evidence suggests mitochondrial metabolites act as second messengers.

Purpose of the Study:

  • To review the signaling functions of mitochondrial metabolites.
  • To focus on tricarboxylic acid cycle metabolites.
  • To provide a framework for understanding mitochondrial metabolism in pathophysiology.

Main Methods:

  • Literature review of mitochondrial signaling.
  • Analysis of tricarboxylic acid cycle metabolite roles.
  • Synthesis of current knowledge on mitochondrial metabolism and disease.

Main Results:

  • Mitochondrial metabolites possess diverse signaling capabilities.
  • These metabolites can induce significant (epi)genetic modifications.
  • Their roles are evident under both normal and stress conditions.

Conclusions:

  • Mitochondrial metabolites are key signaling molecules.
  • Understanding their roles offers new insights into cellular pathophysiology.
  • This review presents a novel framework for mitochondrial metabolism's role in disease.