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Updated: Sep 27, 2025

Lipid Droplet Isolation for Quantitative Mass Spectrometry Analysis
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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
PubMed

Insights

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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