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Individual Atg8 (autophagy related 8) paralogs, comprising MAP1LC3A/LC3A, LC3B, LC3C, GABARAP, GABARAPL1 and GABARAPL2/GATE16, play a crucial role in canonical macroautophagy/autophagy. However, their functions remain unclear owing to functional redundancy. In a previous study, we reported that intracellular triggers hierarchical autophagy in response to bacterial infection. This process commences with the induction of conjugation of Atg8 paralogs (Atg8s) to single membranes (CASM), followed by CASM shedding and subsequent induction of xenophagy. In our recent study, we performed functional analysis of Atg8s during pneumococci-induced hierarchical autophagy. Our findings suggest that LC3A and GABARAPL1 are crucial for CASM induction, whereas GABARAPL2 and GABARAP play sequential roles in CASM shedding and subsequent induction of xenophagy, respectively.: Atg8: autophagy related 8; Atg8s: Atg8 paralogs; CASM: conjugation of Atg8s to single membranes; mpi: minutes post-infection; mpi: minutes post-infection; PcAV: pneumococci-containing autophagic vesicles; PcLV: LC3-associated phagosome (LAPosome)-like vacuole; PcV: pneumococci-containing vesicles; Sp: .
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http://dx.doi.org/10.1080/15548627.2024.2375707 | DOI Listing |
FEBS Lett
November 2024
Heinrich-Heine-Universität Düsseldorf, Mathematisch-Naturwissenschaftliche Fakultät, Institut für Physikalische Biologie, Düsseldorf, Germany.
The human Atg8 family member GABARAP is involved in numerous autophagy-related and -unrelated processes. We recently observed that specifically the deficiency of GABARAP enhances epidermal growth factor receptor (EGFR) degradation upon ligand stimulation. Here, we report on two putative LC3-interacting regions (LIRs) within EGFR, the first of which (LIR1) is selected as a GABARAP binding site in silico.
View Article and Find Full Text PDFAutophagy
November 2024
Department of Bacteriology I, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo, Japan.
Individual Atg8 (autophagy related 8) paralogs, comprising MAP1LC3A/LC3A, LC3B, LC3C, GABARAP, GABARAPL1 and GABARAPL2/GATE16, play a crucial role in canonical macroautophagy/autophagy. However, their functions remain unclear owing to functional redundancy. In a previous study, we reported that intracellular triggers hierarchical autophagy in response to bacterial infection.
View Article and Find Full Text PDFBMC Biol
April 2024
Université Côte d'Azur, INRAE, CNRS, Institut Sophia Agrobiotech, 06903, Sophia Antipolis, France.
Background: Plant pathogens secrete effector proteins into host cells to suppress immune responses and manipulate fundamental cellular processes. One of these processes is autophagy, an essential recycling mechanism in eukaryotic cells that coordinates the turnover of cellular components and contributes to the decision on cell death or survival.
Results: We report the characterization of AVH195, an effector from the broad-spectrum oomycete plant pathogen, Phytophthora parasitica.
Cell Rep
May 2024
Department of Bacteriology I, National Institute of Infectious Diseases, 1-23-1, Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
Atg8 paralogs, consisting of LC3A/B/C and GBRP/GBRPL1/GATE16, function in canonical autophagy; however, their function is controversial because of functional redundancy. In innate immunity, xenophagy and non-canonical single membranous autophagy called "conjugation of Atg8s to single membranes" (CASM) eliminate bacteria in various cells. Previously, we reported that intracellular Streptococcus pneumoniae can induce unique hierarchical autophagy comprised of CASM induction, shedding, and subsequent xenophagy.
View Article and Find Full Text PDFNPJ Microgravity
March 2024
Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Baidy-Vyshnevetskoho St., 2a, Kyiv, 04123, Ukraine.
Autophagy plays an important role in plant growth and development, pathogen invasion and modulates plant response and adaptation to various abiotic stress stimuli. The biogenesis and trafficking of autophagosomes involve microtubules (MTs) as important actors in the autophagic process. However, initiation of autophagy in plants under microgravity has not been previously studied.
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