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Mol Cell DOI:10.1016/j.molcel.2020.01.014

Partitioning of MLX-Family Transcription Factors to Lipid Droplets Regulates Metabolic Gene Expression.

Publication TypeJournal Article
Year of Publication2020
AuthorsMejhert, N, Kuruvilla, L, Gabriel, KR, Elliott, SD, Guie, M-A, Wang, H, Lai, ZWeng, Lane, EA, Christiano, R, Danial, NN, Farese, RV, Walther, TC
JournalMol Cell
Date Published2020 Jan 28
ISSN1097-4164
Abstract

Lipid droplets (LDs) store lipids for energy and are central to cellular lipid homeostasis. The mechanisms coordinating lipid storage in LDs with cellular metabolism are unclear but relevant to obesity-related diseases. Here we utilized genome-wide screening to identify genes that modulate lipid storage in macrophages, a cell type involved in metabolic diseases. Among ∼550 identified screen hits is MLX, a basic helix-loop-helix leucine-zipper transcription factor that regulates metabolic processes. We show that MLX and glucose-sensing family members MLXIP/MondoA and MLXIPL/ChREBP bind LDs via C-terminal amphipathic helices. When LDs accumulate in cells, these transcription factors bind to LDs, reducing their availability for transcriptional activity and attenuating the response to glucose. Conversely, the absence of LDs results in hyperactivation of MLX target genes. Our findings uncover a paradigm for a lipid storage response in which binding of MLX transcription factors to LD surfaces adjusts the expression of metabolic genes to lipid storage levels.

DOI10.1016/j.molcel.2020.01.014
Pubmed

http://www.ncbi.nlm.nih.gov/pubmed/32023484?dopt=Abstract

Alternate JournalMol. Cell
PubMed ID32023484