Insertion of perilipin 3 into a glycero(phospho)lipid monolayer depends on lipid headgroup and acyl chain species.

Lipid droplets (LDs) are organelles that contribute to various cellular functions that are vital for life. Aside from acting as a neutral lipid storage depot, they are also involved in building new membranes, synthesis of steroid hormones, and cell signaling. Many aspects of LD structure and function are not yet well-understood. Here we investigate the interaction of perilipin 3, a member of the perilipin family of LD binding proteins, and three N-terminal truncation mutants with lipid monolayers. The interaction is studied as a function of surface pressure for a series of systematically chosen lipids. We find that the C terminus of perilipin 3 has different insertion behavior from that of the longer truncation mutants and the full-length protein. Inclusion of N-terminal sequences with the C terminus decreases the ability of the protein construct to insert in lipid monolayers. Coupling of anionic lipids to negative spontaneous curvature facilitates protein interaction and insertion. The C terminus shows strong preference for lipids with more saturated fatty acids. This work sheds light on the LD binding properties and function of the different domains of perilipin 3. Copyright © 2016 by the American Society for Biochemistry and Molecular Biology, Inc.

Citation

Mona Mirheydari, Sewwandi S Rathnayake, Hannah Frederick, Taylor Arhar, Elizabeth K Mann, Simon Cocklin, Edgar E Kooijman. Insertion of perilipin 3 into a glycero(phospho)lipid monolayer depends on lipid headgroup and acyl chain species. Journal of lipid research. 2016 Aug;57(8):1465-76

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PMID: 27256689

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