Cited by 466Autophagy in Disease and TherapyUbiquitin and proteasome pathwaysCellular transport and secretion

Biogenesis and Cargo Selectivity of Autophagosomes

Weidberg, Hilla, Shvets, Elena, Elazar, Zvulun·2011·Annual Review of Biochemistry

Abstract

Autophagy is a major catabolic pathway in eukaryotes, which is required for the lysosomal/vacuolar degradation of cytoplasmic proteins and organelles. Interest in the autophagy pathway has recently gained momentum largely owing to identification of multiple autophagy-related genes and recognition of its involvement in various physiological conditions. Here we review current knowledge of the molecular mechanisms regulating autophagy in mammals and yeast, specifically the biogenesis of autophagosomes and the selectivity of their cargo recruitment. We discuss the different steps of autophagy, from the signal transduction events that regulate it to the completion of this pathway by fusion with the lysosome/vacuole. We also review research on the origin of the autophagic membrane, the molecular mechanism of autophagosome formation, and the roles of two ubiquitin-like protein families and other structural elements that are essential for this process. Finally, we discuss the various modes of autophagy and highlight their functional relevance for selective degradation of specific cargos.

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Crossref · 10.1146/annurev-biochem-052709-094552

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227 of 227 references verified0 citation errors · 0 not checkable

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  • Selective autophagy uses receptor proteins such as SQSTM1/p62, NBR1, and AMBRA1 that contain an LIR and separate motifs for binding polyubiquitinated proteins, targeting ubiquitinated proteins to phagophores for degradation.

    “Although autophagic cargo can be trapped passively within the autophagosome in nonselective autophagy, direct substrate recruitment to phagophores in selective autophagy is mediated by a series of receptor proteins (e.g., SQSTM1/p62 [sequestosome 1], NBR1, AMBRA1) that contain both an LC3-interacting region (LIR) and separate motifs for binding polyubiquitinated proteins [41].”
  • Expansion of the phagophore membrane is guided by the ATG12-ATG5-ATG16L1 complex, which catalyzes insertion of LC3 into the phagophore membrane.

    “Expansion then occurs through maturation of the extending phagophore membrane guided by the ATG12–ATG5-ATG16L1 complex, catalyzing insertion of MAP1LC3/LC3 (microtubule associated protein 1 light chain 3) into the phagophore membrane [40,41].”
  • LC3-I undergoes proteolytic processing by ATG4 and conjugation to phosphatidylethanolamine through ATG7 and ATG3 to form lipidated LC3-II, which is incorporated into the phagophore membrane.

    “Before membrane insertion, the unbound and immature LC3 precursor protein (LC3-I) undergoes proteolytic processing by ATG4, and conjugation to phosphatidylethanolamine through ATG7 and ATG3. The resulting mature, lipidated isoform (LC3-II) is incorporated into the phagophore membrane [41].”

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Authors
Weidberg, H., Shvets, E., & Elazar, Z.
Affiliations
Weizmann Institute of Science (IL)
Corresponding author
  • Weidberg, Hilla
  • Shvets, Elena
Venue
Annual Review of Biochemistry
Published
2011-07-07
Volume
80
Issue
1
Pages
125-156
ISSN
  • 0066-4154 (ISSN-L)
  • 1545-4509
OpenAlex
W2052470191
Cited by
466
References
227
Citations by year
2026: 4 · 2025: 10 · 2024: 15 · 2023: 14 · 2022: 24 · 2021: 26 · 2020: 21 · 2019: 28 · 2018: 25 · 2017: 31 · 2016: 40 · 2015: 38 · 2014: 46 · 2013: 59 · 2012: 68
FWCI
7.10
Type
journal article
Language
en
Open access
closed
Locations
  • Annual Review of Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
autophagy, autophagosome formation, selective autophagy, autophagosome-lysosome fusion, ubiquitin-like proteins, autophagy-related genes, signal transduction, yeast autophagy, cytoplasmic degradation
MeSH terms
Animals, Autophagy, Intracellular Membranes, Phagosomes, Yeasts, Organelles, Signal Transduction, Biomarkers

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