Related Experiment Video
Updated: Jul 9, 2025

A Model Membrane Platform for Reconstituting Mitochondrial Membrane Dynamics
Published on: September 2, 2020
Apolipoproteins L1 and L3 control mitochondrial membrane dynamics
Laurence Lecordier1, Paul Heo2, Jonas H Graversen3
1Laboratory of Molecular Parasitology, IBMM, Université Libre de Bruxelles, 6041 Gosselies, Belgium.
Apolipoproteins L1 and L3 regulate mitochondrial dynamics. APOL3 controls phosphatidylinositol 4-kinase-IIIB (PI4KB) and vesicle-associated membrane protein-8 (VAMP8) interactions, impacting mitochondrial fission and fusion.
Area of Science:
- Cell Biology
- Molecular Biology
- Mitochondrial Biology
Background:
- Apolipoproteins L1 and L3 (APOLs) associate with Golgi membrane fission factors.
- APOL1 C-terminal truncation (APOL1Δ) or APOL3 knockout (APOL3-KO) impairs phosphatidylinositol 4-kinase-IIIB (PI4KB) activity and actomyosin organization.
Purpose of the Study:
- To elucidate the roles of APOL1 and APOL3 in regulating PI4KB activity and mitochondrial dynamics.
- To investigate the interaction of APOLs with key proteins involved in membrane trafficking and mitophagy.
Main Methods:
- Investigated APOL-PI4KB interactions and their impact on PI4KB activity.
- Analyzed APOL localization in Golgi-derived vesicles and their role in PI4KB trafficking.
- Examined the effects of APOL1Δ and APOL3-KO on mitophagy flux and mitochondrial reactive oxygen species (ROS) production.
- Studied APOL interactions with mitophagy receptor prohibitin-2 and mitophagosome fusion factor vesicle-associated membrane protein-8 (VAMP8).
Main Results:
- APOL3, not APOL1, directly controls PI4KB activity via interactions with PI4KB and neuronal calcium sensor-1.
- Both APOLs are found in autophagy-related protein 9A vesicles, crucial for PI4KB trafficking.
- APOL1Δ and APOL3-KO reduce PI4KB activity, decrease mitophagy, and increase mitochondrial ROS.
- APOL1 interacts with prohibitin-2, while APOL3 interacts with VAMP8, influencing mitochondrial fission and fusion.
Conclusions:
- APOL3 orchestrates mitochondrial membrane dynamics by interacting with PI4KB (fission) and VAMP8 (fusion).
- APOL1 and APOL3 play distinct but coordinated roles in regulating mitophagy and mitochondrial homeostasis.
More Related Videos
08:53Using Scaffold Liposomes to Reconstitute Lipid-proximal Protein-protein Interactions In Vitro
Published on: January 11, 2017
08:27Visualization and Quantification of Endogenous Intra-Organelle Protein Interactions at ER-Mitochondria Contact Sites by Proximity Ligation Assays
Published on: October 20, 2023
Related Concept Videos
Mitochondrial Membranes
Mitochondrial Protein Sorting
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
The Inner Mitochondrial Membrane
Translocation of Proteins into the Mitochondria
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,...
Protein Transport into the Inner Mitochondrial Membrane
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Mitochondrial Precursor Proteins
Most of the mitochondrial...