nucleotide transport / cellular response to dsDNA / glycophagy / Tat protein binding / GABA receptor binding / toll-like receptor 9 signaling pathway / endocytic recycling / phosphatidylethanolamine binding / autophagy of mitochondrion / cellular response to nitrogen starvation ...nucleotide transport / cellular response to dsDNA / glycophagy / Tat protein binding / GABA receptor binding / toll-like receptor 9 signaling pathway / endocytic recycling / phosphatidylethanolamine binding / autophagy of mitochondrion / cellular response to nitrogen starvation / endosome to lysosome transport / Macroautophagy / beta-tubulin binding / autophagosome membrane / autophagosome maturation / autophagosome assembly / autophagosome / cytoplasmic vesicle membrane / phospholipid binding / autophagy / microtubule / lysosome / ubiquitin protein ligase binding / perinuclear region of cytoplasm / Golgi apparatus / endoplasmic reticulum / cytosol / cytoplasm 類似検索 - 分子機能
Ectopic P granules protein 5 / Autophagy protein Atg8 ubiquitin-like / Autophagy protein Atg8 ubiquitin like / Ubiquitin-like domain superfamily 類似検索 - ドメイン・相同性
Gamma-aminobutyric acid receptor-associated protein-like 1 / Ectopic P granules protein 5 homolog 類似検索 - 構成要素
ジャーナル: Commun Biol / 年: 2021 タイトル: Insights on autophagosome-lysosome tethering from structural and biochemical characterization of human autophagy factor EPG5. 著者: Sung-Eun Nam / Yiu Wing Sunny Cheung / Thanh Ngoc Nguyen / Michael Gong / Samuel Chan / Michael Lazarou / Calvin K Yip / 要旨: Pivotal to the maintenance of cellular homeostasis, macroautophagy (hereafter autophagy) is an evolutionarily conserved degradation system that involves sequestration of cytoplasmic material into the ...Pivotal to the maintenance of cellular homeostasis, macroautophagy (hereafter autophagy) is an evolutionarily conserved degradation system that involves sequestration of cytoplasmic material into the double-membrane autophagosome and targeting of this transport vesicle to the lysosome/late endosome for degradation. EPG5 is a large-sized metazoan protein proposed to serve as a tethering factor to enforce autophagosome-lysosome/late endosome fusion specificity, and its deficiency causes a severe multisystem disorder known as Vici syndrome. Here, we show that human EPG5 (hEPG5) adopts an extended "shepherd's staff" architecture. We find that hEPG5 binds preferentially to members of the GABARAP subfamily of human ATG8 proteins critical to autophagosome-lysosome fusion. The hEPG5-GABARAPs interaction, which is mediated by tandem LIR motifs that exhibit differential affinities, is required for hEPG5 recruitment to mitochondria during PINK1/Parkin-dependent mitophagy. Lastly, we find that the Vici syndrome mutation Gln336Arg does not affect the hEPG5's overall stability nor its ability to engage in interaction with the GABARAPs. Collectively, results from our studies reveal new insights into how hEPG5 recognizes mature autophagosome and establish a platform for examining the molecular effects of Vici syndrome disease mutations on hEPG5.