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Jang H, Song C, Kim B, Lee C, Lee J, Han Y, An I, Kim JH, Nam J, Choi MC. Regulation of Interfacial Anchoring Orientation of Anisotropic Nanodumbbells. ACS Macro Lett 2023; 12:1298-1305. [PMID: 37696008 PMCID: PMC10586460 DOI: 10.1021/acsmacrolett.3c00339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Accepted: 08/09/2023] [Indexed: 09/13/2023]
Abstract
Nanoparticles exhibiting geometrical and chemical anisotropies hold promise for environmentally responsive materials with tunable mechanical properties. However, a comprehensive understanding of their interfacial behaviors remains elusive. In this paper, we control the interfacial anchoring orientation of polystyrene nanodumbbells by adjusting interparticle forces. The film nanostructure is characterized by the orientation angle analysis of individual dumbbells from cross-sectional EM data: dumbbells undergo orientation transitions from a distinctive horizontal bilayer to an isotropic anchoring when electrostatic repulsion is suppressed by either an ionic strength increase or surface amine-modification. This anchoring orientation influences the film's mechanical properties and foam stability, as investigated by a 2D isotherm and dark/bright-field microscopy measurements. Our findings highlight the potential for precise control of supra-colloidal structures by modulating particle alignment, paving the way for smart delivery systems.
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Affiliation(s)
- Hyunwoo Jang
- Department
of Bio and Brain Engineering, Korea Advanced
Institute of Science and Technology, Daejeon 34141, South Korea
| | | | - Byungsoo Kim
- Department
of Bio and Brain Engineering, Korea Advanced
Institute of Science and Technology, Daejeon 34141, South Korea
| | - Chunghyeong Lee
- Department
of Bio and Brain Engineering, Korea Advanced
Institute of Science and Technology, Daejeon 34141, South Korea
| | - Juncheol Lee
- Department
of Bio and Brain Engineering, Korea Advanced
Institute of Science and Technology, Daejeon 34141, South Korea
| | - Youngkyu Han
- AMOREPACIFIC
R&I Center, Yongin 17074, South Korea
| | - Ilsin An
- Department
of Photonics and Nanoelectronics, Hanyang
University, Ansan 15588, South Korea
| | - Joon Heon Kim
- Advanced
Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju 61005, South Korea
| | - Jin Nam
- AMOREPACIFIC
R&I Center, Yongin 17074, South Korea
| | - Myung Chul Choi
- Department
of Bio and Brain Engineering, Korea Advanced
Institute of Science and Technology, Daejeon 34141, South Korea
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Lipowsky R. Remodeling of Membrane Shape and Topology by Curvature Elasticity and Membrane Tension. Adv Biol (Weinh) 2021; 6:e2101020. [PMID: 34859961 DOI: 10.1002/adbi.202101020] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 09/04/2021] [Indexed: 01/08/2023]
Abstract
Cellular membranes exhibit a fascinating variety of different morphologies, which are continuously remodeled by transformations of membrane shape and topology. This remodeling is essential for important biological processes (cell division, intracellular vesicle trafficking, endocytosis) and can be elucidated in a systematic and quantitative manner using synthetic membrane systems. Here, recent insights obtained from such synthetic systems are reviewed, integrating experimental observations and molecular dynamics simulations with the theory of membrane elasticity. The study starts from the polymorphism of biomembranes as observed for giant vesicles by optical microscopy and small nanovesicles in simulations. This polymorphism reflects the unusual elasticity of fluid membranes and includes the formation of membrane necks or fluid 'worm holes'. The proliferation of membrane necks generates stable multi-spherical shapes, which can form tubules and tubular junctions. Membrane necks are also essential for the remodeling of membrane topology via membrane fission and fusion. Neck fission can be induced by fine-tuning of membrane curvature, which leads to the controlled division of giant vesicles, and by adhesion-induced membrane tension as observed for small nanovesicles. Challenges for future research include the interplay of curvature elasticity and membrane tension during membrane fusion and the localization of fission and fusion processes within intramembrane domains.
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Affiliation(s)
- Reinhard Lipowsky
- Theory & Biosystems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, Potsdam, Germany
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Bhatia T, Agudo-Canalejo J, Dimova R, Lipowsky R. Membrane Nanotubes Increase the Robustness of Giant Vesicles. ACS NANO 2018; 12:4478-4485. [PMID: 29659246 DOI: 10.1021/acsnano.8b00640] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Giant unilamellar vesicles (GUVs) provide a direct connection between the nano- and the microregime. On the one hand, these vesicles represent biomimetic compartments with linear dimensions of many micrometers. On the other hand, the vesicle walls are provided by single molecular bilayers that have a thickness of a few nanometers and respond sensitively to molecular interactions with small solutes, biopolymers, and nanoparticles. These nanoscopic responses are amplified by the GUVs and can then be studied on much larger scales. Therefore, GUVs are increasingly used as a versatile research tool for basic membrane science, bioengineering, and synthetic biology. Conventional GUVs have one major drawback, however: they have only a limited capability to cope with external perturbations such as osmotic inflation, adhesion, or micropipette aspiration that tend to rupture the membranes. In contrast, cell membranes tolerate the same kinds of mechanical perturbations without rupture because the latter membranes are coupled to reservoirs of membrane area. Here, we introduce GUVs with membrane nanotubes as model systems that include such area reservoirs. To demonstrate the increased robustness of these tubulated vesicles, we use micropipette aspiration and changes in the osmotic conditions applied to phospholipid membranes doped with the glycolipid GM1. A quantitative comparison between theory and experiment reveals that the response of the GUVs is governed by the membranes' spontaneous tension, a curvature-elastic material parameter that describes the bilayer asymmetry on the nanoscale. Because of their increased robustness, GUVs with nanotubes represent improved research tools for membrane science, in general, with potential applications as storage and delivery systems and as cell-like microcompartments in bioengineering, pharmacology, and synthetic biology.
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Affiliation(s)
- Tripta Bhatia
- Theory & Biosystems , Max Planck Institute of Colloids and Interfaces , 14424 Potsdam , Germany
| | - Jaime Agudo-Canalejo
- Rudolf Peierls Centre for Theoretical Physics , University of Oxford , Oxford OX1 3NP , U.K
- Department of Chemistry , The Pennsylvania State University , University Park , Pennsylvania 16802 , United States
| | - Rumiana Dimova
- Theory & Biosystems , Max Planck Institute of Colloids and Interfaces , 14424 Potsdam , Germany
| | - Reinhard Lipowsky
- Theory & Biosystems , Max Planck Institute of Colloids and Interfaces , 14424 Potsdam , Germany
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Kaufman G, Liu W, Williams DM, Choo Y, Gopinadhan M, Samudrala N, Sarfati R, Yan ECY, Regan L, Osuji CO. Flat Drops, Elastic Sheets, and Microcapsules by Interfacial Assembly of a Bacterial Biofilm Protein, BslA. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13590-13597. [PMID: 29094950 DOI: 10.1021/acs.langmuir.7b03226] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Protein adsorption and assembly at interfaces provide a potentially versatile route to create useful constructs for fluid compartmentalization. In this context, we consider the interfacial assembly of a bacterial biofilm protein, BslA, at air-water and oil-water interfaces. Densely packed, high modulus monolayers form at air-water interfaces, leading to the formation of flattened sessile water drops. BslA forms elastic sheets at oil-water interfaces, leading to the production of stable monodisperse oil-in-water microcapsules. By contrast, water-in-oil microcapsules are unstable but display arrested rather than full coalescence on contact. The disparity in stability likely originates from a low areal density of BslA hydrophobic caps on the exterior surface of water-in-oil microcapsules, relative to the inverse case. In direct analogy with small molecule surfactants, the lack of stability of individual water-in-oil microcapsules is consistent with the large value of the hydrophilic-lipophilic balance (HLB number) calculated based on the BslA crystal structure. The occurrence of arrested coalescence indicates that the surface activity of BslA is similar to that of colloidal particles that produce Pickering emulsions, with the stability of partially coalesced structures ensured by interfacial jamming. Micropipette aspiration and flow in tapered capillaries experiments reveal intriguing reversible and nonreversible modes of mechanical deformation, respectively. The mechanical robustness of the microcapsules and the ability to engineer their shape and to design highly specific binding responses through protein engineering suggest that these microcapsules may be useful for biomedical applications.
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Affiliation(s)
- Gilad Kaufman
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Wei Liu
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Danielle M Williams
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Youngwoo Choo
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Manesh Gopinadhan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Niveditha Samudrala
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Raphael Sarfati
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Elsa C Y Yan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Lynne Regan
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
| | - Chinedum O Osuji
- Department of Chemical and Environmental Engineering, ‡Department of Chemistry, §Department of Molecular Biophysics and Biochemistry, ∥Department of Physics, and ⊥The Integrated Graduate Program in Physical and Engineering Biology, Yale University , New Haven, Connecticut 06511, United States
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