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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 Membranes01:45

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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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Mitochondrial Precursor Proteins01:39

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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.
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Electron Transport Chain: Complex I and II01:46

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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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Mitochondria01:37

Mitochondria

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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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The Inner Mitochondrial Membrane01:28

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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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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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Amino acids trigger MDC-dependent mitochondrial remodeling by altering mitochondrial function.

Nidhi Raghuram1, Adam L Hughes1,2

  • 1Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112, USA.

Biorxiv : the Preprint Server for Biology
|July 19, 2024
PubMed
Summary
This summary is machine-generated.

Amino acids trigger mitochondrial-derived compartments (MDCs) by disrupting mitochondrial metabolism. This process is linked to the TCA cycle and is influenced by the cell

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Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Metabolic Regulation

Background:

  • Cells maintain mitochondrial homeostasis via various pathways.
  • Mitochondrial-derived compartments (MDCs) are involved in regulating outer mitochondrial membrane (OMM) composition.
  • MDCs are triggered by changes in mitochondrial content and increased intracellular amino acids.

Purpose of the Study:

  • To elucidate the mechanism by which amino acids trigger MDC formation.
  • To investigate the role of mitochondrial functional state and metabolism in MDC biogenesis.

Main Methods:

  • Cell culture under different carbon sources and conditions.
  • Analysis of mitochondrial metabolism and TCA cycle intermediates.
  • Genetic manipulation to impair TCA cycle function.

Main Results:

  • Amino acid-induced MDC formation is dependent on mitochondrial functional state.
  • MDC formation occurs with fermentable carbon sources but is blocked by stimulating mitochondrial biogenesis.
  • Amino acid elevation depletes TCA cycle metabolites, and preventing their consumption suppresses MDC formation.
  • Direct impairment of the TCA cycle triggers MDC formation independently of amino acid stress.

Conclusions:

  • Amino acids stimulate MDC formation by perturbing mitochondrial metabolism, specifically impacting the TCA cycle.
  • The functional state of mitochondria and TCA cycle integrity are critical regulators of MDC biogenesis.