title: Bif-1 interacts with Beclin 1 through UVRAG and regulates autophagy and tumorigenesis.
abstract: Autophagy is an evolutionarily conserved 'self-eating' process. Although the genes essential for autophagy (named Atg) have been identified in yeast, the molecular mechanism of how Atg proteins control autophagosome formation in mammalian cells remains to be elucidated. Here, we demonstrate that Bif-1 (also known as Endophilin B1) interacts with Beclin 1 through ultraviolet irradiation resistance-associated gene (UVRAG) and functions as a positive mediator of the class III PI(3) kinase (PI(3)KC3). In response to nutrient deprivation, Bif-1 localizes to autophagosomes where it colocalizes with Atg5, as well as microtubule-associated protein light chain 3 (LC3). Furthermore, loss of Bif-1 suppresses autophagosome formation. Although the SH3 domain of Bif-1 is sufficient for binding to UVRAG, both the BAR and SH3 domains are required for Bif-1 to activate PI(3)KC3 and induce autophagosome formation. We also observed that Bif-1 ablation prolongs cell survival under starvation conditions. Moreover, knockout of Bif-1 significantly enhances the development of spontaneous tumours in mice. These findings suggest that Bif-1 joins the UVRAG-Beclin 1 complex as a potential activator of autophagy and tumour suppressor.
authors: H. Lee Moffitt Cancer Center & Research Institute, 12902 Magnolia Drive. Tampa, FL 33612, USA.
authors: Yoshinori
authors: Y
authors: Takahashi
authors: Domenico
authors: D
authors: Coppola
authors: Norimasa
authors: N
authors: Matsushita
authors: Hernani D
authors: HD
authors: Cualing
authors: Mei
authors: M
authors: Sun
authors: Yuya
authors: Y
authors: Sato
authors: Chengyu
authors: C
authors: Liang
authors: Jae U
authors: JU
authors: Jung
authors: Jin Q
authors: JQ
authors: Cheng
authors: James J
authors: JJ
authors: Mulé
authors: W Jack
authors: WJ
authors: Pledger
authors: Hong-Gang
authors: HG
authors: Wang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D051017:Apoptosis Regulatory Proteins; D001343:Autophagy / Q000235:genetics / Q000502:physiology*; D000071186:Beclin-1; D019556:COS Cells; D053148:Caspase 3 / Q000378:metabolism; D002460:Cell Line; D002522:Chlorocebus aethiops; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D047468:Immunoprecipitation; D051379:Mice; D018345:Mice, Knockout; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D016253:Microscopy, Immunoelectron; D009369:Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D010588:Phagosomes / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure; D019869:Phosphatidylinositol 3-Kinases / Q000235:genetics / Q000378:metabolism; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D014162:Transfection; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D051017:Apoptosis Regulatory Proteins; D000071186:Beclin-1; D053148:Caspase 3; D049452:Green Fluorescent Proteins; D019869:Phosphatidylinositol 3-Kinases; D011506:Proteins; D025521:Tumor Suppressor Proteins; C115010:Becn1 protein, mouse; C486100:Sh3glb1 protein, mouse; C512859:UVRAG protein, mouse