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Aut2p and Aut7p, two novel microtubule-associated proteins are essential for delivery of autophagic vesicles to the vacuole.

Authors:
Lang T, Schaeffeler E, Bernreuther D, Bredschneider M, Wolf DH, Thumm M
Affiliation:
Journal:
The EMBO journal

Abstract

AUT2 and AUT7, two novel genes essential for autophagocytosis in the yeast Saccharomyces cerevisiae were isolated. AUT7 was identified as a low copy suppressor of autophagic defects in aut2-1 cells. Aut7p is a homologue of the rat microtubule-associated protein (MAP) light chain 3 (LC3). Aut2p and Aut7p interact physically. Aut7p is attached to microtubules via Aut2p, which interacts with tubulins Tub1p and Tub2p. aut2- and aut7-deleted cells are unable to deliver autophagic vesicles and the precursor of aminopeptidase I to the vacuole. Double membrane-layered autophagosome-like vesicles accumulate in the cytoplasm of these cells. Our findings suggest that microtubules and an attached protein complex of Aut2p and Aut7p are involved in the delivery of autophagic vesicles to the vacuole.

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