title: Coatomer-dependent protein delivery to lipid droplets.
abstract: Lipid droplets (LDs) are cytoplasmic organelles that store neutral lipids for use as an energy supply in times of nutrient deprivation and for membrane assembly. Misregulation of LD function leads to many human diseases, including lipodystrophy, obesity and neutral lipid storage disorders. A number of proteins have been shown to localize to the surface of lipid droplets, including lipases such as adipose triglyceride lipase (ATGL) and the PAT-domain proteins ADRP (adipophilin) and TIP47, but the mechanism by which they are targeted to LDs is not known. Here we demonstrate that ATGL and ADRP, but not TIP47, are delivered to LDs by a pathway mediated by the COPI and COPII coatomer proteins and their corresponding regulators.
authors.affiliation: Cell Biology and Metabolism Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: Krishnakant G
authors.initials: KG
authors.lastname: Soni
authors.forename: Gonzalo A
authors.initials: GA
authors.lastname: Mardones
authors.forename: Rachid
authors.initials: R
authors.lastname: Sougrat
authors.forename: Elena
authors.initials: E
authors.lastname: Smirnova
authors.forename: Catherine L
authors.initials: CL
authors.lastname: Jackson
authors.forename: Juan S
authors.initials: JS
authors.lastname: Bonifacino
mesh_terms: D020823:ADP-Ribosylation Factor 1 / Q000235:genetics / Q000378:metabolism; D033942:Adaptor Proteins, Vesicular Transport / Q000235:genetics / Q000378:metabolism; D020126:Brefeldin A / Q000378:metabolism; D020755:Coat Protein Complex I / Q000378:metabolism*; D020756:Coatomer Protein / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000378:metabolism; D004721:Endoplasmic Reticulum / Q000378:metabolism / Q000648:ultrastructure; D036681:Fluorescence Recovery After Photobleaching; D006056:Golgi Apparatus / Q000378:metabolism / Q000648:ultrastructure; D020662:Guanine Nucleotide Exchange Factors / Q000235:genetics / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism; D008049:Lipase / Q000235:genetics / Q000378:metabolism*; D008055:Lipids; D008565:Membrane Proteins / Q000378:metabolism; D015388:Organelles / Q000378:metabolism* / Q000648:ultrastructure; D000070780:Perilipin-2; D000070796:Perilipin-3; D011257:Pregnancy Proteins / Q000378:metabolism; D011500:Protein Synthesis Inhibitors / Q000378:metabolism; D021381:Protein Transport / Q000502:physiology; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D033921:Vesicular Transport Proteins; D000217:Acyltransferases
chemical_list: D020823:ADP-Ribosylation Factor 1; D033942:Adaptor Proteins, Vesicular Transport; D020126:Brefeldin A; D020755:Coat Protein Complex I; D020756:Coatomer Protein; D004268:DNA-Binding Proteins; D020662:Guanine Nucleotide Exchange Factors; D047908:Intracellular Signaling Peptides and Proteins; D008049:Lipase; D008055:Lipids; D008565:Membrane Proteins; D000070780:Perilipin-2; D000070796:Perilipin-3; D011257:Pregnancy Proteins; D011500:Protein Synthesis Inhibitors; D034741:RNA, Small Interfering; D011993:Recombinant Fusion Proteins; D033921:Vesicular Transport Proteins; C120445:GBF1 protein, human; C407306:GGA adaptor proteins; C000602982:PLIN2 protein, human; C038196:PLIN3 protein, human; C494794:PNPLA2 protein, human; D000217:Acyltransferases