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Related Concept Videos

Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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...
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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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.
Most of the mitochondrial...
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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.
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Author Spotlight: Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification
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The basic machineries for mitochondrial protein quality control.

Carmela Vazquez-Calvo1, Tamara Suhm2, Sabrina Büttner3

  • 1Department of Biochemistry and Biophysics, Stockholm University, Svante Arrheniusväg 16, Stockholm 106 91, Sweden; Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Svante Arrheniusväg 20C, Stockholm 106 91, Sweden.

Mitochondrion
|November 1, 2019
PubMed
Summary
This summary is machine-generated.

Mitochondria maintain cellular health through quality control systems that manage protein folding, unfolding, and degradation. These mechanisms ensure a functional mitochondrial proteome, impacting cell death and aging.

Keywords:
AggregatesChaperonesMitochondriaMitophagyProteasesProteostasisQuality control

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Area of Science:

  • Cellular Biology
  • Mitochondrial Biology
  • Biochemistry

Background:

  • Mitochondria are central to cellular energy metabolism, biomolecule synthesis, and regulating cell death and aging.
  • Mitochondrial protein homeostasis is crucial for cellular function and survival.
  • Dysfunctional mitochondrial quality control is linked to aging and disease.

Purpose of the Study:

  • To describe the key components of the mitochondrial quality control system.
  • To present recent advances in understanding the molecular mechanisms of mitochondrial proteome maintenance.

Main Methods:

  • Literature review of mitochondrial quality control mechanisms.
  • Analysis of recent research on protein folding, unfolding, and degradation pathways within mitochondria.

Main Results:

  • Detailed overview of the principal molecular players in mitochondrial quality control.
  • Elucidation of novel mechanisms involved in maintaining mitochondrial proteome integrity.

Conclusions:

  • The mitochondrial quality control system is essential for cellular health.
  • Ongoing research continues to uncover intricate molecular mechanisms governing mitochondrial proteostasis.