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Getting the latest healthcare news for you
Getting the latest healthcare news for you
A new study reveals how the protein Atg2 gets "switched on" to help cells build autophagosomes — the tiny structures responsible for clearing out cellular junk. Researchers found that a molecular phosphorylation event acts like a spatiotemporal switch, anchoring Atg2 to the endoplasmic reticulum to enable lipid transfer. Crucially, this mechanism appears to be conserved from yeast to humans.
Cells have a built-in housekeeping system called autophagy, which packages and disposes of damaged or excess cellular components. Central to this process is the autophagosome — a membrane structure that engulfs cellular debris for degradation. But how exactly cells build these structures has remained murky, until now.
A team from Institute of Science Tokyo and the University of Osaka has pinpointed how the lipid transfer protein Atg2 gets activated to dock onto the endoplasmic reticulum (ER) and supply the lipids needed to construct autophagosomes. Published in PNAS (August 4, 2026), the study shows that the protein kinase Atg1 phosphorylates a specific region of Atg2 — called the FFAT motif — enabling it to bind to an ER-resident protein (Scs2/VAP family), effectively anchoring the autophagosome assembly site to the ER.
Importantly, this activation mechanism was found to be conserved from yeast all the way to human cells, suggesting it's a fundamental feature of eukaryotic biology.
Key Takeaways:
Why it matters: Autophagy dysfunction is linked to cancer, neurodegeneration, and aging-related diseases. Understanding the molecular switches that control autophagosome formation could open new doors for therapies targeting these conditions.
