1234-Nanodomain Partitioning in Lipid Droplet Targeting

This research clarifies how membrane proteins move from the endoplasmic reticulum to lipid droplets and accumulate there to manage cellular metabolism. Using advanced single-molecule tracking, the authors demonstrate that proteins like GPAT4 and HSD17B13 move across stable seipin-mediated membrane bridges in a bidirectional manner. While these proteins diffuse at similar speeds in both organelles, they become nano-confined upon reaching the lipid droplet surface. This concentration is driven by specific amino acid residues that interact with local membrane nanodomains, effectively trapping the proteins. These findings reveal that selective protein enrichment on lipid droplets results from localized retention rather than a one-way physical barrier. Such mechanisms are vital for understanding metabolic liver diseases where protein mislocalization occurs.References:Mizrak A, Kæstel-Hansen J, Matthias J, et al. Membrane bridges and nanodomain partitioning govern membrane protein targeting to lipid droplets[J]. Nature Cell Biology, 2026: 1-9.前往小宇宙评论区与主播互动