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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.0K
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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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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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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Regulated Protein Degradation02:58

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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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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Related Experiment Video

Updated: May 23, 2025

Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome
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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome

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PRKN regulates inner mitochondrial membrane PHB2 during mitophagy.

Shan Sun1,2, Hongfeng Wang1, Qilian Ma1

  • 1Jiangsu Key Laboratory of Neuropsychiatric Diseases and College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu 215123, China.

Autophagy Reports
|May 21, 2025
PubMed
Summary

Parkinson disease research reveals PTEN induced kinase 1 (PINK1) and Parkin (PRKN) target inner mitochondrial membrane protein prohibitin 2 (PHB2) during mitophagy. This interaction is crucial for clearing damaged mitochondria.

Keywords:
MAP1LC3B/LC3BPHB2PRKNmitophagyubiquitination

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Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy
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Time-Lapse Video Microscopy for Assessment of EYFP-Parkin Aggregation as a Marker for Cellular Mitophagy
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Area of Science:

  • Mitochondrial biology
  • Cellular quality control
  • Neurodegenerative disease research

Background:

  • Mitophagy, involving PINK1 and PRKN, degrades damaged mitochondria and is linked to neurodegenerative diseases.
  • Current models focus on outer mitochondrial membrane (OMM) protein ubiquitination, neglecting inner mitochondrial membrane (IMM) proteins.

Purpose of the Study:

  • To investigate the role of PRKN-mediated ubiquitination of IMM proteins during mitophagy.
  • To elucidate the function of prohibitin 2 (PHB2) in the PINK1-PRKN mitophagy pathway.

Main Methods:

  • Biochemical assays
  • Microscopy techniques
  • Analysis of PRKN-PHB2 interactions and ubiquitination sites.

Main Results:

  • PRKN ubiquitinates the IMM protein PHB2 after OMM rupture.
  • Mutations in PRKN-targeted ubiquitination sites on PHB2 impair mitochondrial recognition and clearance.
  • Identified a novel role for PHB2 in IMM-associated mitophagy recognition.

Conclusions:

  • The PRKN-PHB2 interaction is critical for mitochondrial quality control.
  • This interaction regulates the recognition of damaged mitochondria by the autophagy machinery via the IMM.