Molecules and Cells

  • 제43권3호
  • /
  • Pages.286-297
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  • 2020
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  • 1016-8478(pISSN)
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  • 0219-1032(eISSN)
한국분자세포생물학회 (Korean Society for Molecular and Cellular Biology)
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Interaction of the Lysophospholipase PNPLA7 with Lipid Droplets through the Catalytic Region

  • Chang, Pingan (Chongqing Key Laboratory of Big Data for Bio-intelligence, School of Bio-information, Chongqing University of Posts and Telecommunications) ;
  • Sun, Tengteng (Chongqing Key Laboratory of Big Data for Bio-intelligence, School of Bio-information, Chongqing University of Posts and Telecommunications) ;
  • Heier, Christoph (Institute of Molecular Biosciences, University of Graz) ;
  • Gao, Hao (Chongqing Key Laboratory of Big Data for Bio-intelligence, School of Bio-information, Chongqing University of Posts and Telecommunications) ;
  • Xu, Hongmei (Chongqing Key Laboratory of Big Data for Bio-intelligence, School of Bio-information, Chongqing University of Posts and Telecommunications) ;
  • Huang, Feifei (Chongqing Key Laboratory of Big Data for Bio-intelligence, School of Bio-information, Chongqing University of Posts and Telecommunications)
  • 투고 : 2019.11.20
  • 심사 : 2020.02.10
  • 발행 : 2020.03.31
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초록

Mammalian patatin-like phospholipase domain containing proteins (PNPLAs) play critical roles in triglyceride hydrolysis, phospholipids metabolism, and lipid droplet (LD) homeostasis. PNPLA7 is a lysophosphatidylcholine hydrolase anchored on the endoplasmic reticulum which associates with LDs through its catalytic region (PNPLA7-C) in response to increased cyclic nucleotide levels. However, the interaction of PNPLA7 with LDs through its catalytic region is unknown. Herein, we demonstrate that PNPLA7-C localizes to the mature LDs ex vivo and also colocalizes with pre-existing LDs. Localization of PNPLA7-C with LDs induces LDs clustering via non-enzymatic intermolecular associations, while PNPLA7 alone does not induce LD clustering. Residues 742-1016 contains four putative transmembrane domains which act as a LD targeting motif and are required for the localization of PNPLA7-C to LDs. Furthermore, the N-terminal flanking region of the LD targeting motif, residues 681-741, contributes to the LD targeting, whereas the C-terminal flanking region (1169-1326) has an anti-LD targeting effect. Interestingly, the LD targeting motif does not exhibit lysophosphatidylcholine hydrolase activity even though it associates with LDs phospholipid membranes. These findings characterize the specific functional domains of PNPLA7 mediating subcellular positioning and interactions with LDs, as wells as providing critical insights into the structure of this evolutionarily conserved phospholipid-metabolizing enzyme family.

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