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Related Experiment Video

Updated: Jan 4, 2026

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LDAF1 and Seipin Form a Lipid Droplet Assembly Complex.

Jeeyun Chung1, Xudong Wu2, Talley J Lambert3

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA; Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA.

Developmental Cell
|November 12, 2019
PubMed
Summary

Researchers identified lipid droplet assembly factor 1 (LDAF1) as a key protein interacting with seipin. This LDAF1-seipin complex acts as the core machinery, dictating where and how lipid droplets form within the endoplasmic reticulum.

Keywords:
Berardinelli-Seip congenital lipodystrophy type 2TMEM159endoplasmic reticulumfatlipid dropletslipodystrophyorganelle biogenesispromethintriacylglycerol

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Area of Science:

  • Cell Biology
  • Lipid Metabolism
  • Protein Biochemistry

Background:

  • Lipid droplets (LDs) are essential cellular organelles originating from the endoplasmic reticulum (ER) for storing neutral lipids like triacylglycerol (TG) and cholesterol esters.
  • The ER protein seipin is known to localize to ER-LD contact sites post-LD formation, but the specific determinants of initial LD biogenesis sites remain unclear.

Purpose of the Study:

  • To identify the protein factors responsible for initiating lipid droplet biogenesis at specific sites within the endoplasmic reticulum.
  • To elucidate the molecular mechanism by which lipid droplet formation is initiated and localized.

Main Methods:

  • Co-immunoprecipitation assays to identify interacting proteins with seipin.
  • Biochemical analysis of purified protein complexes.
  • Cellular localization studies using microscopy to track protein and LD dynamics.
  • Functional assays to assess LD formation in the presence and absence of key proteins.

Main Results:

  • TMEM159, re-named lipid droplet assembly factor 1 (LDAF1), was identified as a seipin interaction partner.
  • LDAF1 and seipin form a large oligomeric complex (∼600 kDa) that associates with triacylglycerol (TG).
  • LD biogenesis occurs at LDAF1-seipin complexes; LDAF1 relocation redirects LD formation sites.
  • Absence of LDAF1 leads to LD formation only at higher cellular TG concentrations, indicating its role in facilitating early biogenesis.

Conclusions:

  • The LDAF1-seipin complex represents the core protein machinery essential for initiating lipid droplet biogenesis.
  • This complex determines the specific sites of initial lipid droplet formation within the endoplasmic reticulum.
  • LDAF1 plays a crucial role in lowering the threshold for cellular triacylglycerol concentration required for lipid droplet formation.