Cited by 6,605Autophagy in Disease and TherapyCellular transport and secretionUbiquitin and proteasome pathways

LC3, a mammalian homologue of yeast Apg8p, is localized in autophagosome membranes after processing.

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Kabeya, Yukiko, Mizushima, Noboru, Ueno, Takashi, Yamamoto, Akitsugu, Kirisako, Takayoshi, Noda, Takeshi, Kominami, Eiki, Ohsumi, Yoshinori +1 more·2000·The EMBO Journal

Abstract

Little is known about the protein constituents of autophagosome membranes in mammalian cells. Here we demonstrate that the rat microtubule-associated protein 1 light chain 3 (LC3), a homologue of Apg8p essential for autophagy in yeast, is associated to the autophagosome membranes after processing. Two forms of LC3, called LC3-I and -II, were produced post-translationally in various cells. LC3-I is cytosolic, whereas LC3-II is membrane bound. The autophagic vacuole fraction prepared from starved rat liver was enriched with LC3-II. Immunoelectron microscopy on LC3 revealed specific labelling of autophagosome membranes in addition to the cytoplasmic labelling. LC3-II was present both inside and outside of autophagosomes. Mutational analyses suggest that LC3-I is formed by the removal of the C-terminal 22 amino acids from newly synthesized LC3, followed by the conversion of a fraction of LC3-I into LC3-II. The amount of LC3-II is correlated with the extent of autophagosome formation. LC3-II is the first mammalian protein identified that specifically associates with autophagosome membranes.

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Crossref · 10.1093/emboj/19.21.5720

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  • LC3II is a lipidated form of LC3.

    “As LC3II is a lipidated form of LC3 (Kabeya et al., 2000), these results indicated an increase in autophagosome formation.”

    From Inducible Rpt3, a Proteasome Component, Knockout in Adult Skeletal Muscle Results in Muscle Atrophy (2020) · cites this paper as Kabeya et al., 2000

    The section on LC3 processing identifies LC3-II as a processed form of LC3, and the distribution results show that it associates with membranes. But the Discussion says the nature of the modification forming LC3-II “remains cryptic”; this paper does not establish that LC3-II is lipidated. Page numbers were not provided in our copy. (LLM, conf=0.88)

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  • Cytosolic LC3-I is conjugated to phosphatidylethanolamine (PE), and in this form LC3-II is recruited to the growing autophagosome membrane.

    “The cytosolic form of LC3 (designated LC3-I) is conjugated to phosphatidylethanolamine (PE) and in this form (designated LC3-II) it is recruited to the growing autophagosome membrane [26].”

    From LC3-Associated Phagocytosis (LAP): Connections with Host Autophagy (2012) · cites this paper as [26]

    The sections on LC3 processing and autophagosome-membrane localization report conversion of cytosolic LC3-I to LC3-II and association of LC3-II with autophagosome membranes (page numbers unavailable). Our copy does not identify phosphatidylethanolamine as the conjugated molecule or establish recruitment specifically to a growing membrane. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The Venus variant of YFP is brighter than mRFP and less sensitive to pH than GFP.

    “Another alternative to mRFP or mCherry is to use the Venus variant of YFP, which is brighter than mRFP and less sensitive to pH than GFP.186”

    From Guidelines for the use and interpretation of assays for monitoring autophagy (2012) · cites this paper as [186]

    The DNA constructions and LC3-II localization sections describe a GFP–LC3 construct and its use in microscopy. Searches for Venus/YFP, mRFP, brightness, and pH sensitivity found no passage comparing these fluorescent proteins, so our copy does not address the attributed claim. The indexed passages provide no page numbers. (LLM, conf=0.78)

    Experimental — accuracy not yet measured

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Authors
Kabeya, Y., Mizushima, N., Ueno, T., Yamamoto, A., Kirisako, T., Noda, T., Kominami, E., Ohsumi, Y., & Yoshimori, T.
Affiliations
  • National Institute for Basic Biology (JP)
  • Juntendo University (JP)
  • Kansai Medical University (JP)
Corresponding author
Yoshimori, Tamotsu
Venue
The EMBO Journal
Published
2000-11-01
Volume
19
Issue
21
Pages
5720-5728
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W1977767269
Cited by
6,605
References
31
Citations by year
2026: 135 · 2025: 173 · 2024: 226 · 2023: 272 · 2022: 287 · 2021: 342 · 2020: 344 · 2019: 380 · 2018: 377 · 2017: 387 · 2016: 381 · 2015: 426 · 2014: 389 · 2013: 447 · 2012: 386
FWCI
18.08
Type
journal article
Language
en
Update notices
erratum (2003-09-01)
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Tokyo Tech Research Repository (Tokyo Institute of Technology) (submittedVersion)
Funders
National Institute for Basic Biology
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
LC3, autophagy, LC3-II, post-translational processing, C-terminal truncation, autophagosomes, yeast homologue
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Fungal Proteins, HeLa Cells, Humans, Intracellular Membranes, Microtubule-Associated Proteins, Molecular Sequence Data, Phagosomes, Protein Processing, Post-Translational, Subcellular Fractions, Transfection, Microscopy, Immunoelectron, Sequence Homology, Amino Acid, DNA Primers, Rats

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