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Bridge-like lipid transfer proteins (BLTPs), like ATG2A, can move both phospholipids and neutral lipids, such as triacylglycerol. This study reveals their role in lipid droplet homeostasis by transferring various lipid species.

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Area of Science:

  • Cell Biology
  • Lipid Metabolism
  • Membrane Biophysics

Background:

  • Bridge-like lipid transfer proteins (BLTPs) are known to transport phospholipids between organelle bilayers.
  • The BLTP ATG2A also interacts with lipid droplets, which have a unique monolayer structure and diverse lipid composition.
  • The function of BLTPs at lipid droplets and their transported lipid substrates remained unclear.

Purpose of the Study:

  • To investigate the activity of BLTPs, specifically ATG2A, at lipid droplets.
  • To determine which lipid species are transported by ATG2A in this unique membrane environment.
  • To elucidate the role of BLTPs in lipid homeostasis at lipid droplets.

Main Methods:

  • Utilized synthetic organelles, including liposomes (bilayers) and artificial lipid droplets (monolayers).
  • Examined the binding of ATG2 to different membrane structures.
  • Performed lipidomics analysis on purified ATG2A from cells.

Main Results:

  • Demonstrated specific and tight binding of ATG2 to lipid monolayers via its COOH-terminal amphipathic helices.
  • Showed that ATG2 effectively transfers phospholipids from monolayers.
  • Discovered rapid transport of the neutral lipid triacylglycerol, with kinetics similar to phospholipid transfer.
  • Lipidomics data indicated ATG2A transports both phospholipids and triacylglycerol in cells.

Conclusions:

  • BLTPs, including ATG2A, are active at lipid droplets and can transfer both phospholipids and neutral lipids.
  • ATG2A's ability to bind monolayers enhances its lipid transfer efficiency.
  • BLTPs likely accumulate on lipid droplets as part of a comprehensive lipid homeostasis mechanism involving diverse lipid movement.