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Curved membrane structures induced by native lipids in giant vesicles

Nair, KS; Raj, NB; Nampoothiri, KM; Mohanan, G; Acosta-Gutiérrez, S; Bajaj, H; (2022) Curved membrane structures induced by native lipids in giant vesicles. Journal of Colloid and Interface Science , 611 pp. 397-407. 10.1016/j.jcis.2021.12.098. Green open access

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Abstract

Native lipids in cell-membrane support crucial functions like intercell communication via their ability to deform into curved membrane structures. Cell membrane mimicking Giant unilamellar vesicles (GUV) is imperative in understanding native lipid's role in membrane transformation however remains challenging to assemble. We construct two giant vesicle models mimicking bacterial inner-membrane (IM) and outer-membrane (OM) under physiological conditions using single-step gel-assisted lipid swelling. IM vesicles composed of native bacterial lipids undergo small-scale membrane remodeling into bud and short-nanotube structures. In contrast, OM vesicles asymmetrically assembled from Lipopolysaccharide (LPS) and bacterial lipids underwent global membrane deformation under controlled osmotic stress. Remarkably, highly-curved structures mimicking cell-membrane architectures, including daughter vesicle networks interconnected by necks and nano-tubes ranging from micro to nanoscale, are generated in OM vesicles at osmotic stress comparable to that applied in IM vesicles. Further, we provide a quantitative description of the membrane structures by experimentally determining membrane elastic parameters, i.e., neck curvature and bending rigidity. We can conclude that a larger spontaneous curvature estimated from the neck curvature and softer membranes in OM vesicles is responsible for large-scale deformation compared to IM vesicles. Our findings will help comprehend the shape dynamics of complex native bacterial lipid membranes.

Type: Article
Title: Curved membrane structures induced by native lipids in giant vesicles
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jcis.2021.12.098
Publisher version: https://doi.org/10.1016/j.jcis.2021.12.098
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Bending Rigidity, Curved membrane, Giant vesicles, Lipopolysaccharides, Membrane deformation, Native lipids, Spontaneous curvature, Cell Membrane, Lipids, Nanotubes, Unilamellar Liposomes
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10143458
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