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Related Concept Videos

ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...
Energy to Drive Translocation01:37

Energy to Drive Translocation

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...
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...
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...
ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...

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Remote Limb Ischemic Preconditioning: A Neuroprotective Technique in Rodents
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The C. elegans mitochondrial K+(ATP) channel: a potential target for preconditioning.

Andrew P Wojtovich1, Lindsay S Burwell, Teresa A Sherman

  • 1Department of Pharmacology & Physiology, Box 604, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642, USA.

Biochemical and Biophysical Research Communications
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Ischemic preconditioning protects against tissue damage. Researchers found a similar mitochondrial channel in C. elegans, offering a new model to study this protective mechanism.

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Area of Science:

  • Biochemistry
  • Physiology
  • Genetics

Background:

  • Ischemic preconditioning (IPC) is a protective response against ischemia reperfusion (IR) injury.
  • The mitochondrial ATP-sensitive potassium channel (mK(ATP)) is implicated in IPC signaling but remains molecularly uncharacterized.

Purpose of the Study:

  • To investigate the presence and characteristics of a K(ATP) channel in Caenorhabditis elegans mitochondria.
  • To establish C. elegans as a model organism for studying the role of mK(ATP) in IR injury.

Main Methods:

  • Isolation and characterization of mitochondria from C. elegans.
  • Electrophysiological and pharmacological analysis of mitochondrial ion channels.

Main Results:

  • Isolated C. elegans mitochondria possess a K(ATP) channel.
  • This channel exhibits similar physiological and pharmacological properties to its vertebrate counterpart.
  • C. elegans demonstrates IPC, supporting its utility as a model.

Conclusions:

  • Mitochondrial K(ATP) channels are conserved across species, including C. elegans.
  • C. elegans provides a valuable genetic model for elucidating the molecular mechanisms of IPC and mK(ATP) function in IR injury.
  • This research opens avenues for understanding and potentially targeting mK(ATP) for therapeutic interventions against IR damage.