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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.
Most of the mitochondrial precursors...

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.
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,...

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

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.
ROS generation is regulated and maintained at moderate levels necessary...

Mitochondrial Membranes

Mitochondrial Membranes

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,...

Mitochondrial Membranes

Mitochondrial Membranes

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,...

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.
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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Related Experiment Video

Updated: May 10, 2026

An Improved Method to Isolate Mitochondrial Contact Sites

An Improved Method to Isolate Mitochondrial Contact Sites

Published on: June 16, 2023

Mitofusin 2 protects hepatocyte mitochondrial function from damage induced by GCDCA.

Yongbiao Chen¹, Lizhi Lv, Zhelong Jiang

¹Department of Hepatobiliary Surgery, Fuzhou General Hospital, Fuzhou, China. cybiao717@sina.com.cn

|June 12, 2013

Summary

Loss of Mitofusin 2 (Mfn2) in liver cells worsens bile acid damage in cholestasis. Restoring Mfn2 levels protects against this liver injury, suggesting Mfn2 as a therapeutic target.

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Immunodetection of Outer Membrane Proteins by Flow Cytometry of Isolated Mitochondria

Immunodetection of Outer Membrane Proteins by Flow Cytometry of Isolated Mitochondria

Published on: September 18, 2014

Area of Science:

Hepatology
Mitochondrial Biology
Cellular Pathophysiology

Background:

Mitochondrial dysfunction is implicated in chronic cholestatic liver diseases.
Mitofusin 2 (Mfn2) is crucial for mitochondrial morphology and signaling.
The role of Mfn2 in bile acid-induced liver injury during cholestasis is unknown.

Purpose of the Study:

To investigate Mfn2 expression in patients with extrahepatic cholestasis.
To determine the role of Mfn2 in bile acid-induced liver injury in vitro.

Main Methods:

Assessed Mfn2 expression in human liver samples and hepatocytes.
Utilized Glycochenodeoxycholic acid (GCDCA) to induce injury in L02 cells.
Overexpressed wild-type and truncated Mfn2 to evaluate protective effects.

Main Results:

Mfn2 expression was decreased in patients with extrahepatic cholestasis and GCDCA-treated cells.
Mfn2 deficiency exacerbated GCDCA-induced mitochondrial damage and morphological changes.
Mfn2 overexpression attenuated mitochondrial fragmentation and protected against GCDCA hepatotoxicity.
A truncated Mfn2 mutant retained protective effects, suggesting a fusion-independent role.

Conclusions:

Loss of Mfn2 contributes to liver damage in extrahepatic cholestasis.
Mfn2 plays a critical role in mitigating bile acid-induced hepatotoxicity.
Mfn2 may regulate mitochondrial metabolism independently of its fusion function.
Targeting Mfn2 presents a potential therapeutic strategy for cholestatic liver diseases.