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• W2912662699 abstract "TP53INP2/DOR (tumor protein p53-inducible nuclear protein 2) contributes to mammalian macroautophagy/autophagy by carrying nuclear deacetylated MAP1LC3/LC3 to the cytoplasm. Here, we report that in the cytoplasm, TP53INP2 further functions in autophagosome biogenesis by promoting LC3B-ATG7 interaction. Cytoplasmic expression of the N-terminal region of TP53INP2, which includes the LC3-interacting region, effectively triggered LC3B-PE production and autophagosome formation. In the cytoplasm, TP53INP2 colocalized to early autophagic membrane structures containing ATG14, ZFYVE1/DFCP1 or WIPI2. While knockdown of TP53INP2 did not affect the formation of these autophagic structures, deletion of BECN1 or Atg5, or mutations preventing TP53INP2 from LC3 interaction, disrupted the membrane binding of TP53INP2. TP53INP2 interacted directly with ATG7 to form a LC3B-TP53INP2-ATG7 complex in the cytoplasm. Loss of TP53INP2-LC3 or TP53INP2-ATG7 interaction significantly reduced LC3B-ATG7 binding. Together, these results suggest that after shifting from the nucleus, cytoplasmic TP53INP2 is targeted to early autophagic membranes accompanied by LC3, where it contributes to autophagosome biogenesis by mediating LC3-ATG7 interaction. Abbreviations: 3-MA, 3-methyladenine; 3NES, 3 repeated nuclear export signal; 3NLS, 3 repeated nuclear localization signal; ACTB, actin beta; ATG, autophagy related; BECN1, Beclin 1; mCherry, monomeric red fluorescent protein mCherry; GFP, green fluorescent protein; GST, glutathione S-transferase; KO, knockout; LC3B/MAP1LC3B, microtubule-associated protein 1 light chain 3 beta; LC3B[G120], LC3B mutant lacking amino acids after glycine 120; LDH, lactate dehydrogenase; LMNB1, lamin B1; LIR, LC3-interacting region; MTORC1, mechanistic target of rapamycin complex 1; PE, phosphatidylethanolamine; PtdIns3K, phosphatidylinositol 3-kinase; PtdIns3P, phosphatidylinositol 3-phosphate; rDNA, ribosomal DNA; RFP, red fluorescent protein; RNAi, RNA interference; SQSTM1, sequestosome 1; TP53INP2, tumor protein p53-inducible nuclear protein 2; TP53INP2[1-28], TP53INP2 mutant containing amino acids 1 to 28; TP53INP2[28-45], TP53INP2 mutant containing amino acids 28 to 45; TP53INP2[LIRΔ], TP53INP2 mutant lacking amino acids 1 to 144; TP53INP2[NLSΔ], TP53INP2 mutant lacking amino acids 145 to 221; TP53INP2W35,I38A, TP53INP2 mutant in which tryptophan 35 and isoleucine 38 are replaced with alanine; TP53INP2W35,I38A[NLSΔ], TP53INP2 mutant lacking amino acids 145 to 221, and tryptophan 35 and isoleucine 38 are replaced with alanine; TP53INP2W35,I38A[Δ1-28],[NLSΔ], TP53INP2 mutant lacking amino acids 1 to 28 and amino acids 145 to 221, and tryptophan 35 and isoleucine 38 are replaced with alanine; TP53INP2[Δ1-28],[NLSΔ], TP53INP2 mutant lacking amino acids 1 to 28 and amino acids 145 to 221; TP53INP2[Δ67-111],[NLSΔ], TP53INP2 mutant lacking amino acids 67 to 111 and amino acids 145 to 221; TP53INP2[Δ112-144],[NLSΔ], TP53INP2 mutant lacking amino acids 112 to 144 and amino acids 145 to 221; TUBB, tubulin beta class I; ULK1, unc-51 like autophagy activating kinase 1; VMP1, vacuole membrane protein 1; WIPI2, WD repeat domain phosphoinositide-interacting 2; WT, wild-type; ZFYVE1/DFCP1, zinc finger FYVE-type containing 1." @default.
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• W2912662699 date "2019-02-20" @default.
• W2912662699 modified "2023-10-17" @default.
• W2912662699 title "TP53INP2 contributes to autophagosome formation by promoting LC3-ATG7 interaction" @default.
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• W2912662699 doi "https://doi.org/10.1080/15548627.2019.1580510" @default.
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