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Chemphyschem. 2017 Oct 6;18(19):2651-2657. doi: 10.1002/cphc.201700450. Epub 2017 Jun 30.

Lipid Internal Dynamics Probed in Nanodiscs.

Author information

1
CBMN, CNRS., University of Bordeaux, IECB, All. Geoffroy Saint-Hilaire, 34600, Pessac, France.
2
D C-CINA, University of Basel, 4058, Basel, Switzerland.
3
Laboratory for Physical Chemistry, ETH Zürich, 8093, Zürich, Switzerland.
4
Biozentrum, University of Basel, 4058, Basel, Switzerland.

Abstract

Nanodiscs offer a very promising tool to incorporate membrane proteins into native-like lipid bilayers and an alternative to liposomes to maintain protein functions and protein-lipid interactions in a soluble nanoscale object. The activity of the incorporated membrane protein appears to be correlated to its dynamics in the lipid bilayer and by protein-lipid interactions. These two parameters depend on the lipid internal dynamics surrounded by the lipid-encircling discoidal scaffold protein that might differ from more unrestricted lipid bilayers observed in vesicles or cellular extracts. A solid-state NMR spectroscopy investigation of lipid internal dynamics and thermotropism in nanodiscs is reported. The gel-to-fluid phase transition is almost abolished for nanodiscs, which maintain lipid fluid properties for a large temperature range. The addition of cholesterol allows fine-tuning of the internal bilayer dynamics by increasing chain ordering. Increased site-specific order parameters along the acyl chain reflect a higher internal ordering in nanodiscs compared with liposomes at room temperature; this is induced by the scaffold protein, which restricts lipid diffusion in the nanodisc area.

KEYWORDS:

NMR spectroscopy; lipids; membranes; nanostructures; solid-state structures

PMID:
28573816
PMCID:
PMC5697661
DOI:
10.1002/cphc.201700450
[Indexed for MEDLINE]
Free PMC Article

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