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ATG5 defines a phagophore domain connected to the endoplasmic reticulum during autophagosome formation in plants.

Nat Commun. 2014 Jun 20;5:4121
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摘要


Autophagosomes are the organelles responsible for macroautophagy and arise, in yeast and animals, from the sealing of a cup-shaped double-membrane precursor, the phagophore. How the phagophore is generated and grows into a sealed autophagosome is still not clear in detail, and unknown in plants. This is due, in part, to the scarcity of structurally informative, real-time imaging data of the required protein machinery at the phagophore formation site. Here we find that in intact living Arabidopsis tissue, autophagy-related protein ATG5, which is essential for autophagosome formation, is present at the phagophore site from early, sub-resolution stages and later defines a torus-shaped structure on a flat cisternal early phagophore. Movement and expansion of this structure are accompanied by the underlying endoplasmic reticulum, suggesting tight connections between the two compartments. Detailed real-time and 3D imaging of the growing phagophore are leveraged to propose a model for autophagosome formation in plants.

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