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Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

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,...

Mitochondrial Protein Sorting

Mitochondrial Protein Sorting

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.
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The Unfolded Protein Response

The Unfolded Protein Response

The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...

Mitochondrial Precursor Proteins

Mitochondrial Precursor Proteins

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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Export of Misfolded Proteins out of the ER

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...

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Related Experiment Video

Updated: Jun 6, 2026

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

A stress-responsive system for mitochondrial protein degradation.

Jin-Mi Heo¹, Nurit Livnat-Levanon, Eric B Taylor

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

|November 13, 2010

Summary

Vms1 protein moves to mitochondria during stress, preventing cellular failure. Its absence impairs mitochondrial function and organism lifespan, highlighting its crucial role in protein quality control.

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Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome

Visualizing Mitophagy with Fluorescent Dyes for Mitochondria and Lysosome

Published on: November 30, 2022

Area of Science:

Cell Biology
Mitochondrial Biology
Protein Degradation

Background:

Mitochondrial stress responses are critical for cellular health.
The ubiquitin-proteasome system regulates protein degradation, notably in ER-associated degradation (ERAD).
The function of Vms1 and its role in mitochondrial stress were previously uncharacterized.

Purpose of the Study:

To investigate the function of the unstudied protein Vms1 (Ydr049).
To determine Vms1's role in mitochondrial stress response and protein degradation.
To elucidate the relationship between Vms1, Cdc48/VCP, and mitochondrial homeostasis.

Main Methods:

Yeast genetics and cell biology techniques.
Mitochondrial stress induction and localization studies.
Protein interaction assays (yeast and mammalian Vms1 with Cdc48/VCP).
Analysis of mitochondrial function, oxidative stress sensitivity, and lifespan.

Main Results:

Vms1 translocates from the cytosol to mitochondria under stress.
Cells lacking Vms1 exhibit mitochondrial failure, oxidative stress sensitivity, and reduced lifespan.
Vms1 interacts with Cdc48/VCP and is required for oxidative stress-induced mitochondrial localization of Cdc48.
Vms1 deficiency impairs ubiquitin-dependent mitochondrial protein degradation, respiratory function, and cell viability.

Conclusions:

Vms1 is a conserved protein essential for mitochondrial protein degradation.
Vms1 acts as a critical link between mitochondrial stress and the Cdc48/VCP machinery.
Maintaining mitochondrial protein quality control via Vms1 is vital for cellular and organismal survival.