Cells have a backup recycling system scientists just mapped
Saha S, Ghosh DK
Plant Signaling
The way a drought-stressed tomato plant or a struggling houseplant clears out damaged cell parts to survive turns out to run on more backup pathways than scientists thought, which helps explain why some plants bounce back from stress better than others.
Every living cell, including those in plants, has a cleanup crew that breaks down and recycles worn-out parts. For years scientists thought this crew always needed one specific helper protein called ATG8 to do its job. This research rounds up evidence that cells, including plant cells, have alternate cleanup routes that work even without that helper, giving plants more backup options when they're stressed, growing, or fighting off damage.
Key Findings
ATG8/LC3-GABARAP lipidation, long considered a universal requirement for autophagosome formation, is not needed for all forms of cellular self-degradation
ATG8-independent pathways have been documented across mammals, plants, and protozoa, including alternative macroautophagy and microautophagy-like routes
These unconventional pathways separate membrane formation, cargo capture, and lysosomal delivery into modules that can operate independently of ATG8, with roles in stress adaptation, organelle quality control, and developmental remodeling
chevron_right Technical Summary
Scientists have found that cells can recycle their own worn-out parts using a backup cleanup system that skips a protein long thought essential for the process. This widens our understanding of how plants and other organisms cope with stress and clear out cellular debris.
Abstract Preview
Original paper
Emerging mechanisms of ATG8-independent non-canonical autophagy.
ATG8-independent autophagy represents an emerging field of cellular degradation that challenges the long-held view that LC3/GABARAP lipidation is universally required for autophagosome formation an...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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