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Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
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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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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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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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Energy to Drive Translocation01:37

Energy to Drive Translocation

2.1K
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...
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Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Mitochondrial Chaperone Code: Just warming up.

R Felipe Perez1, Gianna Mochi2, Ariba Khan1

  • 1Department of Urology, Upstate Medical University, Syracuse, NY, USA.

Cell Stress & Chaperones
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This summary is machine-generated.

Mitochondrial chaperones, crucial for protein folding, are regulated by post-translational modifications. Understanding this regulation is key for developing therapies for mitochondrial diseases.

Keywords:
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Area of Science:

  • Mitochondrial biology
  • Molecular cell biology
  • Protein folding

Background:

  • Over 99% of mitochondrial proteins are nuclear-encoded, necessitating chaperone-assisted folding post-import.
  • Heat shock proteins (Hsps) and chaperonins (Hsp60/10) are vital for mitochondrial protein import and folding.
  • The 'Chaperone Code' highlights post-translational modifications in chaperone regulation, but this is understudied in mitochondria.

Purpose of the Study:

  • To review the current literature on post-translational modifications of mitochondrial chaperones.
  • To explore the impact of these modifications on mitochondrial function.
  • To discuss the implications for disease pathogenesis and therapeutic strategies.

Main Methods:

  • Literature review of recent studies on mitochondrial chaperone regulation.
  • Analysis of post-translational modifications affecting chaperone activity.
  • Synthesis of findings related to mitochondrial function and disease.

Main Results:

  • Post-translational modifications significantly impact mitochondrial chaperone function and activity.
  • Dysregulation of these modifications can lead to impaired mitochondrial function.
  • Specific modifications are linked to various pathogenic conditions.

Conclusions:

  • Post-translational regulation is a critical layer of control for mitochondrial chaperones.
  • Further research into the 'Chaperone Code' in mitochondria is essential for understanding disease.
  • Targeting mitochondrial chaperone modifications offers potential therapeutic avenues.