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Related Concept Videos

Mitochondria01:37

Mitochondria

14.3K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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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,...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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,...
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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
The ETC is comprised of...
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Related Experiment Video

Updated: Aug 25, 2025

Author Spotlight: Uncovering the Role of Mitochondrial Calcium Phosphate in Heart Failure and Bioenergetics
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Author Spotlight: Uncovering the Role of Mitochondrial Calcium Phosphate in Heart Failure and Bioenergetics

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Taking mitochondria to heart.

Wei Wong1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|October 18, 2022
PubMed
Summary

Long-chain fatty acids alter how the body uses mitochondria. These fatty acids redirect mitochondria released from fat cells away from immune cells and towards the heart.

Area of Science:

  • Mitochondrial biology
  • Cardiovascular science
  • Metabolic research

Background:

  • Adipocytes release mitochondria into circulation.
  • Macrophages typically scavenge these extracellular mitochondria.
  • Mitochondrial dysfunction is implicated in heart disease.

Purpose of the Study:

  • To investigate the influence of long-chain fatty acids on mitochondrial trafficking.
  • To determine if fatty acids alter the destination of adipocyte-derived mitochondria.

Main Methods:

  • In vivo studies using animal models.
  • Analysis of mitochondrial distribution in different tissues.
  • Metabolic profiling and fatty acid measurements.

Main Results:

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  • Long-chain fatty acids significantly redirected the uptake of adipocyte-released mitochondria.
  • Mitochondria were preferentially taken up by cardiac tissue instead of macrophages.
  • This shift correlated with specific fatty acid profiles.

Conclusions:

  • Long-chain fatty acids play a role in directing extracellular mitochondria.
  • This mechanism may influence cardiac health by altering mitochondrial supply.
  • Further research is needed to explore therapeutic implications.