Protein p62 binds directly to autophagy machinery to clear protein clumps
In short: Researchers studying cells in the lab found that the protein p62/SQSTM1 binds directly to the autophagy proteins LC3A and LC3B. This interaction, mediated by a short 22-amino-acid sequence on p62, helps the cell drag large clumps of ubiquitin-tagged proteins into autolysosomes, where they are broken down.
Why it matters: failing to clear these ubiquitin-tagged clumps is linked to neurodegenerative disease. The researchers also found p62 itself seems needed for the clumps to form, suggesting it helps both build and clear them.
The team tracked this using a new pH-sensitive fluorescent tag, watching clumps up to 2 micrometres wide get degraded in acidic autolysosomes. Because the work was done in cultured cells, not a living organism, it's unclear how well this holds up in intact tissue.
Why it matters: This cellular mechanism helps explain how cells tag and dispose of protein clumps linked to neurodegenerative disease.
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