Cited by 53Autophagy in Disease and TherapyCellular transport and secretionCalcium signaling and nucleotide metabolism

Drosophila Golgi membrane protein Ema promotes autophagosomal growth and function

Open access
Kim, Sungsu, Naylor, Sarah A., DiAntonio, Aaron·2012·Proceedings of the National Academy of Sciences

Abstract

Autophagy is a self-degradative process in which cellular material is enclosed within autophagosomes and trafficked to lysosomes for degradation. Autophagosomal biogenesis is well described; however mechanisms controlling the growth and ultimate size of autophagosomes are unclear. Here we demonstrate that the Drosophila membrane protein Ema is required for the growth of autophagosomes. In an ema mutant, autophagosomes form in response to starvation and developmental cues, and these autophagosomes can mature into autolysosomes; however the autophagosomes are very small, and autophagy is impaired. In fat body cells, Ema localizes to the Golgi complex and is recruited to the membrane of autophagosomes in response to starvation. The Drosophila Golgi protein Lva also is recruited to the periphery of autophagosomes in response to starvation, and this recruitment requires ema . Therefore, we propose that Golgi is a membrane source for autophagosomal growth and that Ema facilitates this process. Clec16A, the human ortholog of Ema, is a candidate autoimmune susceptibility locus. Expression of Clec16A can rescue the autophagosome size defect in the ema mutant, suggesting that regulation of autophagosome morphogenesis may be a fundamental function of this gene family.

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  • Studies in Drosophila with the homologue of Clec16a, ema, demonstrate the importance of the gene to the autophagy pathway and protein trafficking in the endosomal pathway.

    “Studies in Drosophila with the homologue of Clec16a, ema, demonstrate the importance of the gene to the autophagy pathway and protein trafficking in the endosomal pathway89.”
  • In ema-deficient Drosophila cells there is no observed defect in fusion between lysosomes and autophagosomes.

    “While in ema-deficient Drosophila cells there is no observed defect in fusion between lysosomes and autophagosomes, reduced fusion has been suggested in studies of mitophagy induction in islet cells lacking Clec16a916.”
  • Flies mutant for ema exhibit decreased turnover of p62 and decreased mitophagy.

    “Flies mutant for ema exhibit decreased turnover of p62 and decreased mitophagy9.”
  • The Drosophila CLEC16A homolog ema is required for efficient recruitment of the Golgi complex protein Lava lamp (Lva) to autophagic structures in fat body cells.

    “The Drosophila CLEC16A homolog ema is required for efficient recruitment of the Golgi complex protein Lava lamp (Lva) to autophagic structures in fat body cells”
  • ema is required for proper endosomal maturation in Garland cells.

    “and for proper endosomal maturation in Garland cells947.”

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Research works printed but not linked: 5

  1. Proc Natl Acad Sci U S A. 2012 May 1;109(18):6800–6801.
  2. [1]Kim S, Wairkar YP, Daniels RW, DiAntonio A. The novel endosomal membrane protein Ema interacts with the class C Vps-HOPS complex to promote endosomal maturation. J Cell Biol. 2010;188:717–734. doi: 10.1083/jcb.200911126. [DOI] [PMC free article] [PubMed] [Google Scholar] · DOI · Paper page
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Authors
Kim, S., Naylor, S. A., & DiAntonio, A.
Affiliations
  • Department of Developmental Biology, Washington University in St. Louis, St. Louis, MO 63110
  • Washington University in St. Louis (US)
Venue
Proceedings of the National Academy of Sciences
Published
2012-04-09
Volume
109
Issue
18
Pages
E1072-81
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2113382515
Cited by
53
References
52
Citations by year
2026: 1 · 2025: 3 · 2024: 5 · 2023: 3 · 2022: 4 · 2021: 5 · 2020: 1 · 2019: 3 · 2018: 1 · 2017: 6 · 2016: 5 · 2015: 7 · 2014: 3 · 2013: 5 · 2012: 1
FWCI
3.83
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse (DA020812, R01DA020812)
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 › Physiology › Calcium signaling and nucleotide metabolism
Keywords
EMA, autophagy, Golgi apparatus, CLEC16A, autophagosome formation, starvation, fat body, autolysosomes, Drosophila
MeSH terms
Animals, Autophagy, Drosophila, Fat Body, Golgi Apparatus, Humans, Lysosomes, Membrane Fusion, Monosaccharide Transport Proteins, Mutation, Phagosomes, Endosomes, Genes, Insect, Drosophila Proteins, Lectins, C-Type, Microscopy, Electron, Transmission

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