The vacuolar transporter chaperone (VTC) complex is required for microautophagy.

Details

Serval ID
serval:BIB_39F7EB59B50C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The vacuolar transporter chaperone (VTC) complex is required for microautophagy.
Journal
Molecular Biology of the Cell
Author(s)
Uttenweiler A., Schwarz H., Neumann H., Mayer A.
ISSN
1059-1524 (Print)
ISSN-L
1059-1524
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
18
Number
1
Pages
166-175
Language
english
Abstract
Microautophagy involves direct invagination and fission of the vacuolar/lysosomal membrane under nutrient limitation. This occurs by an autophagic tube, a specialized vacuolar membrane invagination that pinches off vesicles into the vacuolar lumen. In this study we have identified the VTC (vacuolar transporter chaperone) complex as required for microautophagy. The VTC complex is present on the ER and vacuoles and at the cell periphery. On induction of autophagy by nutrient limitation the VTC complex is recruited to and concentrated on vacuoles. The VTC complex is inhomogeneously distributed within the vacuolar membranes, showing an enrichment on autophagic tubes. Deletion of the VTC complex blocks microautophagic uptake into vacuoles. The mutants still form autophagic tubes but the production of microautophagic vesicles from their tips is impaired. In line with this, affinity-purified antibodies to the Vtc proteins inhibit microautophagic uptake in a reconstituted system in vitro. Our data suggest that the VTC complex is an important constituent of autophagic tubes and that it is required for scission of microautophagic vesicles from these tubes.
Keywords
Antibody Specificity, Autophagy, Chromatography, Affinity, Green Fluorescent Proteins/metabolism, Membrane Transport Proteins/metabolism, Molecular Chaperones/metabolism, Mutation/genetics, Protein Binding, Protein Processing, Post-Translational, Protein Structure, Tertiary, Recombinant Fusion Proteins/metabolism, Saccharomyces cerevisiae/cytology, Saccharomyces cerevisiae/ultrastructure, Saccharomyces cerevisiae Proteins/metabolism, Vacuoles/metabolism
Pubmed
Web of science
Create date
24/01/2008 16:06
Last modification date
20/08/2019 14:29
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