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Photoinduced Shape Changes of Giant Vesicles Comprising Phospholipids and Azobenzene-Containing Cationic Amphiphiles.
Chem Asian J
January 2025
Keio University Faculty of Science and Technology Graduate School of Science and Technology: Keio Gijuku Daigaku Rikogakubu Daigakuin Rikogaku Kenkyuka, Department of Applied Chemistry, 3-14-1 Hiyoshi, Kohoku-ku, 2238522, Yokohama, JAPAN.
For the development of new functional materials for various applications, such as drug or gene delivery and environmental remediation, the relationship between function and morphology has been considered an important aspect for controlling affinity to the targets. However, there are only a few reports on this relationship because the molecular strategy for the precise control of vesicle shape has been restricted. Herein, we report the photocontrol of vesicle shape using azobenzene-containing amphiphilic switches.
View Article and Find Full Text PDFUnusual Endotaxy Growth of Hexagonal Nanosheets by the Self-Assembly of a Homopolymer.
Angew Chem Int Ed Engl
December 2024
Department of Gynaecology and Obstetrics, Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation, Clinical Research Center for Anesthesiology and Perioperative Medicine, Translational Research Institute of Brain and Brain-Like Intelligence, Shanghai Fourth People's Hospital, School of Medicine, Tongji University, Shanghai, 200434, China.
A classical crystallization usually grows epitaxially from a crystal nucleus. Presented in this study is an unusual endotaxy growth manner of a crystalline homopolymer to form hexagonal nanosheets. The amphiphilic homopolymer, poly(3-(4-(phenyldiazenyl)phenoxy)propyl methacrylate) (PAzoPMA), is first annealed in isopropanol to afford a hexagonal nut-like structure.
View Article and Find Full Text PDFNatural Size Variation Amongst Protocells Leads to Survival and Growth Under Hypoosmotic Conditions.
Small
December 2024
School of Chemistry, Australian Centre for Astrobiology, ARC Centre of Excellence in Synthetic Biology, UNSW RNA Institute, UNSW Sydney, Sydney, NSW 2052, Australia.
Article Synopsis
- * The research shows that fatty acid vesicles can endure high osmotic pressures and retain their contents, unlike traditional phospholipid systems that tend to burst under similar stresses.
- * The incorporation of amphiphiles from smaller vesicles helps these giant fatty acid vesicles adapt, promoting survival and membrane growth in challenging conditions.
Ultrahigh yields of giant vesicles obtained through mesophase evolution and breakup.
Soft Matter
December 2024
Department of Bioengineering, University of California, Merced, CA 95343, USA.
Self-assembly of dry amphiphilic lipid films on surfaces upon hydration is a crucial step in the formation of cell-like giant unilamellar vesicles (GUVs). GUVs are useful as biophysical models, as soft materials, as chassis for bottom-up synthetic biology, and in biomedical applications. Here combined quantitative measurements of the molar yield and distributions of sizes and high-resolution imaging of the evolution of thin lipid films on surfaces, we report the discovery of a previously unknown pathway of lipid self-assembly which can lead to ultrahigh yields of GUVs of >50%.
View Article and Find Full Text PDFA molecular mechanism for how pressure induces interdigitation of phospholipid bilayer membranes.
Biochim Biophys Acta Biomembr
December 2024
Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan.
The phase transition from the ripple gel phase to the interdigitated gel phase of bilayers of phosphatidylcholines (PCs) with two saturated long-chain fatty acids under high pressure was investigated by pressure-scanning microscopy, fluorometry, and dynamic light scattering (DLS) measurements. Microscopic observation for giant vesicles (GVs) of distearoyl-PC (DSPC) under high pressure showed that spherical GVs transforms significantly into warped and distorted spherical ones instantaneously at the pressure-induced interdigitation. The fluorescence intensities of amphiphilic probe Prodan and hydrophobic probe Laurdan in the dipalmitoyl-PC (DPPC) bilayer steeply decreased and increased, respectively, at the interdigitation, suggesting that the conformational change of the polar head group of DPPC molecule in the bilayer transiently occurred at the interdigitation.
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