Molecular identification of transmembrane protein 68 as an endoplasmic reticulum-anchored and brain-specific proteinReport as inadecuate




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Acyltransferases catalyze essential reactions in the buildup and remodeling of glycerophospholipids and contribute to the maintenance and diversity of cellular membranes. Transmembrane protein 68 TMEM68 is an evolutionarily conserved protein of unknown function, that forms a distinct subgroup within the glycerophospholipid acyltransferase family. In the current study we expressed murine TMEM68 for the first time in mammalian cells to characterize its subcellular localization, topology, and possible biological functions. We show that TMEM68 is an integral membrane protein and orients both, the N- and C-terminus towards the cytosol. Live cell imaging demonstrated that TMEM68 is localized mainly at the endoplasmic reticulum ER, but not at cellular lipid droplets LDs. The positioning of TMEM68 at the ER was dependent on its first transmembrane domain TMD, which by itself was sufficient to target cytosolic green fluorescence protein GFP to the ER. In contrast, a second TMD was dispensable for ER localization of TMEM68. Finally, we found that among multiple murine tissues the expression level of TMEM68 transcripts was highest in brain. We conclude that TMEM68 is an integral ER membrane protein and a putative acyltransferase involved in brain glycerolipid metabolism.



Author: Ping’an Chang , Christoph Heier, Wenzhen Qin, Liping Han, Feifei Huang, Quan Sun

Source: http://plos.srce.hr/



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