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Related Concept Videos

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.
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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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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.
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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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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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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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Related Experiment Video

Updated: May 23, 2025

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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Pulling back the mitochondria's iron curtain.

Shani Ben Zichri-David1, Liraz Shkuri1, Tslil Ast1

  • 1Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, 7610001 Israel.

Npj Metabolic Health and Disease
|March 7, 2025
PubMed
Summary
This summary is machine-generated.

Mitochondria use iron to create vital molecules for energy production. Dysregulation of mitochondrial iron handling contributes to various human diseases, highlighting its critical role in health.

Keywords:
BiochemistryCell biologyMetabolic pathways

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathology

Background:

  • Mitochondria are central to cellular energy metabolism and biosynthesis.
  • Cellular iron is essential for mitochondrial function, particularly for iron-sulfur clusters and heme synthesis.
  • Mitochondrial iron dysregulation is linked to numerous human diseases.

Purpose of the Study:

  • To review the critical roles of mitochondrial iron utilization.
  • To explore the connection between mitochondrial iron handling and human diseases.

Main Methods:

  • Literature review of mitochondrial iron metabolism.
  • Analysis of the intersection between iron homeostasis and mitochondrial pathways.
  • Examination of disease associations with mitochondrial iron mishandling.

Main Results:

  • Mitochondria are key sites for iron cofactor biosynthesis (e.g., iron-sulfur clusters, heme).
  • These iron cofactors are indispensable for mitochondrial energy production and metabolic pathways.
  • Improper mitochondrial iron management is implicated in a wide range of pathologies.

Conclusions:

  • Mitochondrial iron utilization is fundamental for cellular health.
  • Disruptions in mitochondrial iron homeostasis represent a significant factor in human disease pathogenesis.