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Updated: Sep 27, 2025
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Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
Published on: April 17, 2017
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MOSPD2 is an endoplasmic reticulum-lipid droplet tether functioning in LD homeostasis
Mehdi Zouiouich1,2,3,4, Thomas Di Mattia1,2,3,4, Arthur Martinet1,2,3,4
1IGBMC, Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.
The Journal of Cell Biology
|April 7, 2022
Summary
MOSPD2 protein forms crucial endoplasmic reticulum (ER) and lipid droplet (LD) contacts. Its unique CRAL-TRIO domain drives ER-LD tethering, impacting lipid droplet assembly.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Membrane contact sites organize organelle interactions via protein bridges.
- Vesicle-associated membrane protein-associated protein (VAP) family proteins are ER-anchored tethers.
- MOSPD2, a VAP family member, possesses a unique CRAL-TRIO domain.
Purpose of the Study:
- Investigate the role of MOSPD2 in ER-lipid droplet (LD) contacts.
- Elucidate the function of the MOSPD2 CRAL-TRIO domain in tethering.
- Determine MOSPD2's specific involvement in lipid droplet biology.
Main Methods:
- Protein interaction studies
- Cellular imaging
- Biochemical assays to analyze protein-membrane interactions
Main Results:
- MOSPD2 directly tethers the ER to LDs via its CRAL-TRIO domain.
- An amphipathic helix in MOSPD2 interacts with lipid packing defects on LDs.
- Absence of MOSPD2 significantly disrupts lipid droplet assembly.
Conclusions:
- MOSPD2 acts as a specific ER-LD tether, distinct from general ER tethering roles.
- The CRAL-TRIO domain is essential for MOSPD2's specific function in LD biology.
- MOSPD2 plays a critical role in regulating lipid droplet formation and maintenance.
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