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Super-swelled lyotropic single crystals

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
Lipids self-assemble into diverse supramolecular structures that exhibit thermotropic and/or lyotropic behavior. Lyotropic mesophases, where membranes conform to periodic minimal surfaces dividing two nonpenetrating aqueous subspaces, are arguably one of the most intriguing phases of lipid materials. Traditional 3D bicontinuous cubic lipid materials appear as a polycrystal of varying degrees of order. When exposed to water, the properties of the molecular building blocks of the membrane determine specific swelling limits setting the lattice dimensions at about 15 nm. This limited swelling severely impairs their application as delivery vehicles of large drugs or as matrices for guiding protein crystallization. We report the discovery of self-assembly strategies leading to the emergence of lipid bicontinuous single crystals with unprecedented swelling capacity. Here, the conventional strategy to increase unit cell size is tweaking membrane composition to include charged building blocks, a process to achieve electrostatic-driven swelling. In this paper, we demonstrate that controlling self-assembly external conditions when coupled to membrane composition yields 3D bicontinuous cubic phases that swell up to lattice dimensions of 68 nm. Importantly, and contrary to what is perceived for soft lyotropic materials in general, the self-assembly methodology enables the development of large super-swelled monocrystals. Utilizing small-angle X-ray scattering and cryoelectron microscopy, we underpin three crucial factors dictating the stabilization of super-swelled lipid bicontinuous cubic single crystals: (i) organic solvent drying speed, (ii) membrane charge density, and (iii) polyethylene glycol-conjugated lipids amount.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Inst. of Health
OSTI ID:
1405023
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 41 Vol. 114; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (9)

Design of ultra-swollen lipidic mesophases for the crystallization of membrane proteins with large extracellular domains text January 2018
Nanostructured Lipid-Based Films for Substrate-Mediated Applications in Biotechnology journal January 2018
Cubosomes: The Next Generation of Smart Lipid Nanoparticles? journal March 2019
Design of ultra-swollen lipidic mesophases for the crystallization of membrane proteins with large extracellular domains journal February 2018
The structural fate of lipid nanoparticles in the extracellular matrix journal January 2020
Lipid-based liquid crystalline films and solutions for the delivery of cargo to cells journal July 2019
Double diamond phase in pear-shaped nanoparticle systems with hard sphere solvent journal October 2018
Cubosomes: the next generation of smart lipid nanoparticles? text January 2018
Cubosomes: the next generation of smart lipid nanoparticles? text January 2018

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