title: Beclin1 controls the levels of p53 by regulating the deubiquitination activity of USP10 and USP13.
abstract: Autophagy is an important intracellular catabolic mechanism that mediates the degradation of cytoplasmic proteins and organelles. We report a potent small molecule inhibitor of autophagy named "spautin-1" for specific and potent autophagy inhibitor-1. Spautin-1 promotes the degradation of Vps34 PI3 kinase complexes by inhibiting two ubiquitin-specific peptidases, USP10 and USP13, that target the Beclin1 subunit of Vps34 complexes. Beclin1 is a tumor suppressor and frequently monoallelically lost in human cancers. Interestingly, Beclin1 also controls the protein stabilities of USP10 and USP13 by regulating their deubiquitinating activities. Since USP10 mediates the deubiquitination of p53, regulating deubiquitination activity of USP10 and USP13 by Beclin1 provides a mechanism for Beclin1 to control the levels of p53. Our study provides a molecular mechanism involving protein deubiquitination that connects two important tumor suppressors, p53 and Beclin1, and a potent small molecule inhibitor of autophagy as a possible lead compound for developing anticancer drugs.
authors.affiliation: State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, China.
authors.forename: Junli
authors.initials: J
authors.lastname: Liu
authors.forename: Hongguang
authors.initials: H
authors.lastname: Xia
authors.forename: Minsu
authors.initials: M
authors.lastname: Kim
authors.forename: Lihua
authors.initials: L
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.forename: Lihong
authors.initials: L
authors.lastname: Zhang
authors.forename: Yu
authors.initials: Y
authors.lastname: Cai
authors.forename: Helin Vakifahmetoglu
authors.initials: HV
authors.lastname: Norberg
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Furuya
authors.forename: Minzhi
authors.initials: M
authors.lastname: Jin
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Zhu
authors.forename: Huanchen
authors.initials: H
authors.lastname: Wang
authors.forename: Jia
authors.initials: J
authors.lastname: Yu
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Li
authors.forename: Yan
authors.initials: Y
authors.lastname: Hao
authors.forename: Augustine
authors.initials: A
authors.lastname: Choi
authors.forename: Hengming
authors.initials: H
authors.lastname: Ke
authors.forename: Dawei
authors.initials: D
authors.lastname: Ma
authors.forename: Junying
authors.initials: J
authors.lastname: Yuan
mesh_terms: D000818:Animals; D051017:Apoptosis Regulatory Proteins / Q000378:metabolism*; D001343:Autophagy; D000071186:Beclin-1; D001596:Benzylamines / Q000494:pharmacology*; D058546:Class III Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010450:Endopeptidases / Q000378:metabolism*; D006801:Humans; D051379:Mice; D011799:Quinazolines / Q000494:pharmacology*; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D043222:Ubiquitin Thiolesterase / Q000378:metabolism*; D064570:Ubiquitin-Specific Proteases; D054875:Ubiquitination
chemical_list: D051017:Apoptosis Regulatory Proteins; D000071186:Beclin-1; C115010:Becn1 protein, mouse; D001596:Benzylamines; D011799:Quinazolines; D016159:Tumor Suppressor Protein p53; C431363:USP10 protein, human; C000591235:spautin-1; D058546:Class III Phosphatidylinositol 3-Kinases; D010450:Endopeptidases; C561638:USP13 protein, human; D043222:Ubiquitin Thiolesterase; D064570:Ubiquitin-Specific Proteases