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    The size of lipid droplets varies greatly in vivo and is determined by both intrinsic and extrinsic factors. From an RNAi screen in Drosophila, we found that knocking down subunits of COP9 signalosome (CSN) results in enlarged lipid droplets under high-fat, but not normal, conditions. We identified CG2064, a retinol dehydrogenase (RDH) homolog, as the proteasomal degradation target of CSN in regulating lipid droplet size. RDH/CG2064 interacts with the lipid droplet-resident protein Plin2 and the RDH/CG2064-Plin2 axis acts to reduce the overall level and lipid droplet localization of Bmm/ATGL lipase. This axis is important for larval survival under prolonged starvation. Thus, we discovered an RDH-Plin2 axis modulates lipid droplet size. © 2022 The Authors. Published under the terms of the CC BY NC ND 4.0 license.


    Xuefan Zhao, Wei Wang, Yan Yao, Xia Li, Xiahe Huang, Yingchun Wang, Mei Ding, Xun Huang. An RDH-Plin2 axis modulates lipid droplet size by antagonizing Bmm lipase. EMBO reports. 2022 Feb 03;23(3):e52669

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    PMID: 35132760

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