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Selective Autophagy: ATG8 Family Proteins, LIR Motifs and Cargo Receptors

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https://hdl.handle.net/10037/17761
DOI
https://doi.org/10.1016/j.jmb.2019.07.016
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Date
2019-07-13
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Author
Johansen, Terje; Lamark, Trond
Abstract
Selective autophagy relies on soluble or membrane-bound cargo receptors that recognize cargo and bring about autophagosome formation at the cargo. The cargo-bound receptors interact with lipidated ATG8 family proteins anchored in the membrane at the concave side of the forming autophagosome. The interaction is mediated by 15- to 20-amino-acid-long sequence motifs called LC3-interacting region (LIR) motifs that bind to the LIR docking site (LDS) of ATG8 proteins. In this review, we focus on LIR–ATG8 interactions and the soluble mammalian selective autophagy receptors. We discuss the roles of ATG8 family proteins as membrane scaffolds in autophagy and the LIR–LDS interaction and how specificity for binding to GABARAP or LC3 subfamily proteins is achieved. We also discuss atypical LIR–LDS interactions and a novel LIR-independent interaction. Recently, it has become clear that several of the soluble cargo receptors are able to recruit components of the core autophagy apparatus to aid in assembling autophagosome formation at the site of cargo sequestration. A model on phagophore recruitment and expansion on a selective autophagy receptor-coated cargo incorporating the latest findings is presented.
Publisher
Elsevier
Citation
Johansen T, Lamark T. Selective autophagy: ATG8 family proteins, LIR motifs and cargo receptors. Journal of Molecular Biology. 2019:1-24
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