Acyl-chain saturation regulates the order of phosphatidylinositol 4,5-bisphosphate nanodomains

Luís Borges-Araújo, Marco M. Domingues, Alexander Fedorov, Nuno C. Santos, Manuel N. Melo, Fábio Fernandes

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) plays a critical role in the regulation of various plasma membrane processes and signaling pathways in eukaryotes. A significant amount of cellular resources are spent on maintaining the dominant 1-stearoyl-2-arachidonyl PI(4,5)P2 acyl-chain composition, while less abundant and more saturated species become more prevalent in response to specific stimuli, stress or aging. Here, we report the impact of acyl-chain structure on the biophysical properties of cation-induced PI(4,5)P2 nanodomains. PI(4,5)P2 species with increasing levels of acyl-chain saturation cluster in progressively more ordered nanodomains, culminating in the formation of gel-like nanodomains for fully saturated species. The formation of these gel-like domains was largely abrogated in the presence of 1-stearoyl-2-arachidonyl PI(4,5)P2. This is, to the best of our knowledge, the first report of the impact of PI(4,5)P2 acyl-chain composition on cation-dependent nanodomain ordering, and provides important clues to the motives behind the enrichment of PI(4,5)P2 with polyunsaturated acyl-chains. We also show how Ca2+-induced PI(4,5)P2 nanodomains are able to generate local negative curvature, a phenomenon likely to play a role in membrane remodeling events.

Original languageEnglish
Article number164
JournalCOMMUNICATIONS CHEMISTRY
Volume4
Issue number1
DOIs
Publication statusPublished - Dec 2021

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