1
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Zhang H, Pan F, Li S. Self-Assembly of Lipid Molecules under Shear Flows: A Dissipative Particle Dynamics Simulation Study. Biomolecules 2023; 13:1359. [PMID: 37759759 PMCID: PMC10526246 DOI: 10.3390/biom13091359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/28/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023] Open
Abstract
The self-assembly of lipid molecules in aqueous solution under shear flows was investigated using the dissipative particle dynamics simulation method. Three cases were considered: zero shear flow, weak shear flow and strong shear flow. Various self-assembled structures, such as double layers, perforated double layers, hierarchical discs, micelles, and vesicles, were observed. The self-assembly behavior was investigated in equilibrium by constructing phase diagrams based on chain lengths. Results showed the remarkable influence of chain length, shear flow and solution concentration on the self-assembly process. Furthermore, the self-assembly behavior of lipid molecules was analyzed using the system energy, particle number and shape factor during the dynamic processes, where the self-assembly pathways were observed and analyzed for the typical structures. The results enhance our understanding of biomacromolecule self-assembly in a solution and hold the potential for applications in biomedicine.
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Affiliation(s)
- Huan Zhang
- Department of Physics, Wenzhou University, Wenzhou 325035, China
| | - Fan Pan
- School of Data Science and Artificial Intelligence, Wenzhou University of Technology, Wenzhou 325035, China
| | - Shiben Li
- Department of Physics, Wenzhou University, Wenzhou 325035, China
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2
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Sun L, Pan F, Li S. Self-Assembly of Lipid Mixtures in Solutions: Structures, Dynamics Processes and Mechanical Properties. MEMBRANES 2022; 12:membranes12080730. [PMID: 35893448 PMCID: PMC9394357 DOI: 10.3390/membranes12080730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/19/2022] [Accepted: 07/20/2022] [Indexed: 02/01/2023]
Abstract
The self-assembly of lipid mixtures in aqueous solution was investigated by dissipative particle dynamics simulation. Two types of lipid molecules were modelled, where three mixed structures, i.e., the membrane, perforated membrane and vesicle, were determined in the self-assembly processes. Phase behaviour was investigated by using the phase diagrams based on the tail chain lengths for the two types of lipids. Several parameters, such as chain number and average radius of gyration, were employed to explore the structural formations of the membrane and perforated membrane in the dynamic processes. Interface tension was used to demonstrate the mechanical properties of the membrane and perforated membrane in the equilibrium state and dynamics processes. Results help us to understand the self-assembly mechanism of the biomolecule mixtures, which has a potential application for designing the lipid molecule-based bio-membranes in solutions.
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Affiliation(s)
| | - Fan Pan
- Correspondence: (F.P.); (S.L.)
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3
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Moinpour M, Fracassi A, Brea RJ, Salvador-Castell M, Pandey S, Edwards MM, Seifert S, Joseph S, Sinha SK, Devaraj NK. Controlling Protein Enrichment in Lipid Sponge Phase Droplets using SNAP-tag Bioconjugation. Chembiochem 2021; 23:e202100624. [PMID: 34936727 DOI: 10.1002/cbic.202100624] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/21/2021] [Indexed: 11/11/2022]
Abstract
All cells use organized lipid compartments to facilitate specific biological functions. Membrane-bound organelles create defined spatial environments that favor unique chemical reactions while isolating incompatible biological processes. Despite the fundamental role of cellular organelles, there is a scarcity of methods for preparing functional artificial lipid-based compartments. Here, we demonstrate a robust bioconjugation system for sequestering proteins into zwitterionic lipid sponge phase droplets. Incorporation of benzylguanine (BG)-modified phospholipids that form stable covalent linkages with an O6-methylguanine DNA methyltransferase (SNAP-tag) fusion protein enables programmable control of protein capture. We show that this methodology can be used to anchor hydrophilic proteins at the lipid-aqueous interface, concentrating them within an accessible but protected chemical environment. SNAP-tag technology enables the integration of proteins that regulate complex biological functions in lipid sponge phase droplets, and should facilitate the development of advanced lipid-based artificial organelles.
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Affiliation(s)
- Mahta Moinpour
- UCSD: University of California San Diego, Chemistry and Biochemistry, UNITED STATES
| | - Alessandro Fracassi
- UCSD: University of California San Diego, Chemistry and Biochemistry, UNITED STATES
| | - Roberto J Brea
- University of A Coruna: Universidade da Coruna, Chemistry, SPAIN
| | | | - Sudip Pandey
- UCSD: University of California San Diego, Physics, UNITED STATES
| | - Madison M Edwards
- UCSD: University of California San Diego, Chemistry and Biochemistry, UNITED STATES
| | - Soenke Seifert
- Argonne National Laboratory, Xray science division, UNITED STATES
| | - Simpson Joseph
- UCSD: University of California San Diego, Chemistry and Biochemistry, UNITED STATES
| | - Sunil K Sinha
- UCSD: University of California San Diego, Physics, UNITED STATES
| | - Neal Krishna Devaraj
- University of California, San Diego, Chemistry and Biochemistry, 9500 Gilman Drive, Urey Hall 4120, 92093, La Jolla, UNITED STATES
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4
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Salvati Manni L, Duss M, Assenza S, Boyd BJ, Landau EM, Fong WK. Enzymatic hydrolysis of monoacylglycerols and their cyclopropanated derivatives: Molecular structure and nanostructure determine the rate of digestion. J Colloid Interface Sci 2021; 588:767-775. [PMID: 33309146 DOI: 10.1016/j.jcis.2020.11.110] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/16/2020] [Accepted: 11/26/2020] [Indexed: 12/31/2022]
Abstract
Colloidal lipidic particles with different space groups and geometries (mesosomes) are employed in the development of new nanosystems for the oral delivery of drugs and nutrients. Understanding of the enzymatic digestion rate of these particles is key to the development of novel formulations. In this work, the molecular structure of the lipids has been systematically tuned to examine the effect on their self-assembly and digestion rate. The kinetic and phase changes during the lipase-catalysed hydrolysis of mesosomes formed by four synthetic cyclopropanated lipids and their cis-unsaturated analogues were monitored by dynamic small angle X-ray scattering and acid/base titration. It was established that both the phase behaviour and kinetics of the hydrolysis are greatly affected by small changes in the molecular structure of the lipid as well as by the internal nanostructure of the colloidal particles.
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Affiliation(s)
- Livia Salvati Manni
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; School of Chemistry and University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia.
| | - Michael Duss
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, Canada
| | - Salvatore Assenza
- Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, E-28049 Madrid, Spain; Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, VIC 3052, Australia
| | - Ehud M Landau
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
| | - Wye-Khay Fong
- Discipline of Chemistry, School of Environmental and Life Sciences, University of Newcastle, Callaghan 2308, NSW, Australia.
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5
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Kermani AA. A guide to membrane protein X‐ray crystallography. FEBS J 2020; 288:5788-5804. [DOI: 10.1111/febs.15676] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 11/17/2020] [Accepted: 12/14/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Ali A. Kermani
- Department of Molecular, Cellular, and Developmental Biology University of Michigan Ann Arbor MI USA
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6
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Selikhanov G, Fufina T, Vasilieva L, Betzel C, Gabdulkhakov A. Novel approaches for the lipid sponge phase crystallization of the Rhodobacter sphaeroides photosynthetic reaction center. IUCRJ 2020; 7:1084-1091. [PMID: 33209319 PMCID: PMC7642779 DOI: 10.1107/s2052252520012142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 09/02/2020] [Indexed: 06/11/2023]
Abstract
With the recent developments in the field of free-electron-laser-based serial femtosecond crystallography, the necessity to obtain a large number of high-quality crystals has emerged. In this work crystallization techniques were selected, tested and optimized for the lipid mesophase crystallization of the Rhodobacter sphaeroides membrane pigment-protein complex, known as the photosynthetic reaction center (RC). Novel approaches for lipid sponge phase crystallization in comparatively large volumes using Hamilton gas-tight glass syringes and plastic pipetting tips are described. An analysis of RC crystal structures obtained by lipid mesophase crystallization revealed non-native ligands that displaced the native electron-transfer cofactors (carotenoid sphero-idene and a ubi-quinone molecule) from their binding pockets. These ligands were identified and were found to be lipids that are major mesophase components. The selection of distinct co-crystallization conditions with the missing cofactors facilitated the restoration of sphero-idene in its binding site.
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Affiliation(s)
- Georgii Selikhanov
- Institute of Protein Research, Russian Academy of Sciences, Institutskaya 4, Puschino, Moscow region 142290, Russian Federation
- Institute of Basic Biological Problems, Russian Academy of Sciences, Institutskaya 2, Puschino, Moscow region 142290, Russian Federation
| | - Tatiana Fufina
- Institute of Basic Biological Problems, Russian Academy of Sciences, Institutskaya 2, Puschino, Moscow region 142290, Russian Federation
| | - Lyudmila Vasilieva
- Institute of Basic Biological Problems, Russian Academy of Sciences, Institutskaya 2, Puschino, Moscow region 142290, Russian Federation
| | - Christian Betzel
- Institute of Biochemistry and Molecular Biology, University of Hamburg, at Deutsches Elektronen-Synchrotron (DESY), Notkestrasse 85, Hamburg, 22607, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, Hamburg, 22761, Germany
| | - Azat Gabdulkhakov
- Institute of Protein Research, Russian Academy of Sciences, Institutskaya 4, Puschino, Moscow region 142290, Russian Federation
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7
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Vallooran JJ, Duss M, Ansorge P, Mezzenga R, Landau EM. Stereochemical Purity Can Induce a New Crystalline Mesophase in Phytantriol Lipids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9132-9141. [PMID: 32654490 DOI: 10.1021/acs.langmuir.0c01344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The impact of stereochemical purity of lipids on their self-assembly behavior is critical for establishing their true phase behavior from their commercial counterparts, which often contains stereoisomeric mixtures and other impurities. Here, stereochemically pure phytantriol (PT), (3,7,11,15-tetramethylhexadecane-1,2,3-triol) was synthesized from the natural trans-phytol and its thermotropic and lyotropic phase behavior in water investigated by small-angle X-ray scattering (SAXS), polarized optical microscopy (POM), and differential scanning calorimetry (DSC). These chemically pure lipids contain two chiral centers at the hydrophilic head group region and two chiral centers at the lipophilic tail region, allowing us to address the question of whether the molecular stereochemistry is related to the macroscopic phase behavior of phytantriol. In contrast to its commercial stereoisomeric mixtures, which form an isotropic micellar phase, neat (2S,3S,7R,11R)-3,7,11,15-tetramethylhexadecane-1,2,3-triol (S,S-PT) shows a smectic lamellar phase at room temperature, whereas (2R,3R,7R,11R)-3,7,11,15-tetramethylhexadecane-1,2,3-triol (R,R-PT) forms solid crystals. The lyotropic phase behavior of R,R-PT appears to be identical to that of the previously reported commercial stereoisomeric PT mixtures. In contrast, S,S-PT exhibits a different phase behavior. A lamellar crystalline phase (Lc) is formed instead of an isotropic micellar phase at a low water content, which also coexisted with other phases at low temperature. Subtle change in the shape of the diastereomers leads to variable steric interactions and subsequently affects the packing of the lipids at the molecular level, thereby influencing its self-assembling behavior. Finally, lipidic cubic phase crystallization of the membrane protein bacteriorhodopsin yielded a larger number of microcrystals with a higher average crystal length from S,S-PT than from commercial PT, suggesting faster nucleation.
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Affiliation(s)
- Jijo J Vallooran
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Michael Duss
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Philipp Ansorge
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Raffaele Mezzenga
- Department of Health Sciences & Technology, ETH Zurich, Schmelzbergstrasse 9, 8092 Zürich, Switzerland
| | - Ehud M Landau
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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8
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Zhang Q, Cherezov V. Chemical tools for membrane protein structural biology. Curr Opin Struct Biol 2019; 58:278-285. [PMID: 31285102 DOI: 10.1016/j.sbi.2019.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 05/29/2019] [Accepted: 06/03/2019] [Indexed: 01/24/2023]
Abstract
Solving high-resolution structures of membrane proteins has been an important challenge for decades, still lagging far behind that of soluble proteins even with the recent remarkable technological advances in X-ray crystallography and electron microscopy. Central to this challenge is the necessity to isolate and solubilize membrane proteins in a stable, natively folded and functional state, a process influenced by not only the proteins but also their surrounding chemical environment. This review highlights recent community efforts in the development and characterization of novel membrane agents and ligand tools to stabilize individual proteins and protein complexes, which together have accelerated progress in membrane protein structural biology.
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Affiliation(s)
- Qinghai Zhang
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
| | - Vadim Cherezov
- Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, CA 90089, USA.
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9
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Salvati Manni L, Assenza S, Duss M, Vallooran JJ, Juranyi F, Jurt S, Zerbe O, Landau EM, Mezzenga R. Soft biomimetic nanoconfinement promotes amorphous water over ice. NATURE NANOTECHNOLOGY 2019; 14:609-615. [PMID: 30962546 DOI: 10.1038/s41565-019-0415-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Water is a ubiquitous liquid with unique physicochemical properties, whose nature has shaped our planet and life as we know it. Water in restricted geometries has different properties than in bulk. Confinement can prevent low-temperature crystallization of the molecules into a hexagonal structure and thus create a state of amorphous water. To understand the survival of life at subzero temperatures, it is essential to elucidate this behaviour in the presence of nanoconfining lipidic membranes. Here we introduce a family of synthetic lipids with designed cyclopropyl modifications in the hydrophobic chains that exhibit unique liquid-crystalline behaviour at low temperature, which enables the maintenance of amorphous water down to ~10 K due to nanoconfinement. The combination of experiments and molecular dynamics simulations unveils a complex lipid-water phase diagram in which bicontinuous cubic and lamellar liquid crystalline phases that contain subzero liquid, glassy or ice water emerge as a competition between the two components, each pushing towards its thermodynamically favoured state.
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Affiliation(s)
- Livia Salvati Manni
- Department of Chemistry, University of Zürich, Zürich, Switzerland
- Department of Health Sciences & Technology, ETH Zürich, Zürich, Switzerland
| | - Salvatore Assenza
- Department of Health Sciences & Technology, ETH Zürich, Zürich, Switzerland
| | - Michael Duss
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Jijo J Vallooran
- Department of Chemistry, University of Zürich, Zürich, Switzerland
- Department of Health Sciences & Technology, ETH Zürich, Zürich, Switzerland
| | - Fanni Juranyi
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen, Switzerland
| | - Simon Jurt
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Oliver Zerbe
- Department of Chemistry, University of Zürich, Zürich, Switzerland
| | - Ehud M Landau
- Department of Chemistry, University of Zürich, Zürich, Switzerland.
| | - Raffaele Mezzenga
- Department of Health Sciences & Technology, ETH Zürich, Zürich, Switzerland.
- Department of Materials, ETH Zürich, Zürich, Switzerland.
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10
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Ghanbari R, Assenza S, Zueblin P, Mezzenga R. Impact of Molecular Partitioning and Partial Equilibration on the Estimation of Diffusion Coefficients from Release Experiments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5663-5671. [PMID: 30929450 DOI: 10.1021/acs.langmuir.9b00510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The present work addresses the effect of partial equilibration and molecular partitioning on the interpretation of release experiments. In this regard, it is shown how release profiles and the values of extracted transport parameters are affected by the time protocol chosen for sample collection by considering a series of experiments where the latter is systematically varied. Caffeine is investigated as a main model drug because of its similar affinity for water and lipids, while monolinolein-based lipid cubic phases are chosen as host matrices because of their wide employment in release studies. Our findings point to a progressive decline in diffusion rate upon increasing the time step, that is, the gap in time between two consecutive pickups, which is a signature of increasing equilibration of caffeine concentration between the lipidic mesophase and the water phase. Furthermore, the amount of released molecules at the first pickup displays negligible changes for large time steps, indicating complete equilibration in such cases. A model is introduced based on Fick's diffusion which goes beyond the assumption of perfect-sink conditions, a common feature of the typical theoretical approaches hitherto developed. The model is shown to account quantitatively for the experimental data and is subsequently employed to clarify the interplay of the adopted release protocol with the various transport parameters in determining the final outcome of the release process. Particularly, two additional molecular drugs are considered, namely glucose and proflavine, which are, respectively, more hydrophilic and hydrophobic than caffeine, thus allowing elucidating the role of molecular partitioning.
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Affiliation(s)
- Reza Ghanbari
- Food and Soft Materials Science, Department of Health Science & Technology, Institute of Food, Nutrition & Health , ETH Zurich , Schmelzbergstrasse 9 , CH-8092 Zurich , Switzerland
| | - Salvatore Assenza
- Food and Soft Materials Science, Department of Health Science & Technology, Institute of Food, Nutrition & Health , ETH Zurich , Schmelzbergstrasse 9 , CH-8092 Zurich , Switzerland
| | - Patrick Zueblin
- Food and Soft Materials Science, Department of Health Science & Technology, Institute of Food, Nutrition & Health , ETH Zurich , Schmelzbergstrasse 9 , CH-8092 Zurich , Switzerland
| | - Raffaele Mezzenga
- Food and Soft Materials Science, Department of Health Science & Technology, Institute of Food, Nutrition & Health , ETH Zurich , Schmelzbergstrasse 9 , CH-8092 Zurich , Switzerland
- Department of Materials , ETH Zurich , Wolfgang-Pauli-Strasse 10 , 8093 Zurich , Switzerland
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11
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Ghanbari R, Assenza S, Mezzenga R. The interplay of channel geometry and molecular features determines diffusion in lipidic cubic phases. J Chem Phys 2019; 150:094901. [DOI: 10.1063/1.5080929] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Reza Ghanbari
- Department of Health Sciences and Technology, ETH Zurich, CH-8092 Zurich, Switzerland
| | - Salvatore Assenza
- Department of Health Sciences and Technology, ETH Zurich, CH-8092 Zurich, Switzerland
| | - Raffaele Mezzenga
- Department of Health Sciences and Technology, ETH Zurich, CH-8092 Zurich, Switzerland
- Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
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12
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Bottlebrush block polymers in solutions: Self-assembled microstructures and interactions with lipid membranes. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.02.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Design of ultra-swollen lipidic mesophases for the crystallization of membrane proteins with large extracellular domains. Nat Commun 2018; 9:544. [PMID: 29416037 PMCID: PMC5803273 DOI: 10.1038/s41467-018-02996-5] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 01/12/2018] [Indexed: 02/05/2023] Open
Abstract
In meso crystallization of membrane proteins from lipidic mesophases is central to protein structural biology but limited to membrane proteins with small extracellular domains (ECDs), comparable to the water channels (3–5 nm) of the mesophase. Here we present a strategy expanding the scope of in meso crystallization to membrane proteins with very large ECDs. We combine monoacylglycerols and phospholipids to design thermodynamically stable ultra-swollen bicontinuous cubic phases of double-gyroid (Ia3d), double-diamond (Pn3m), and double-primitive (Im3m) space groups, with water channels five times larger than traditional lipidic mesophases, and showing re-entrant behavior upon increasing hydration, of sequences Ia3d→Pn3m→Ia3d and Pn3m→Im3m→Pn3m, unknown in lipid self-assembly. We use these mesophases to crystallize membrane proteins with ECDs inaccessible to conventional in meso crystallization, demonstrating the methodology on the Gloeobacter ligand-gated ion channel (GLIC) protein, and show substantial modulation of packing, molecular contacts and activation state of the ensued proteins crystals, illuminating a general strategy in protein structural biology. In meso crystallization of membrane proteins is limited to proteins with small extracellular domains (ECDs). Here, authors combine monoacylglycerols and phospholipids to design stable ultra-swollen bicontinuous cubic phases that allow in meso crystallization of proteins with large ECDs.
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14
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Mishraki-Berkowitz T, Cohen G, Aserin A, Garti N. Controlling insulin release from reverse hexagonal (H II) liquid crystalline mesophase by enzymatic lipolysis. Colloids Surf B Biointerfaces 2018; 161:670-676. [PMID: 29172155 DOI: 10.1016/j.colsurfb.2017.11.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 10/29/2017] [Accepted: 11/11/2017] [Indexed: 12/14/2022]
Abstract
In the present study we aimed to control insulin release from the reverse hexagonal (HII) mesophase using Thermomyces lanuginosa lipase (TLL) in the environment (outer TLL) or within the HII cylinders (inner TLL). Two insulin-loaded systems differing by the presence (or absence) of phosphatidylcholine (PC) were examined. In general, incorporation of PC into the HII interface (without TLL) increased insulin release, as a more cooperative system was formed. Addition of TLL to the systems' environments resulted in lipolysis of the HII structure. In the absence of PC, the lipolysis was more dominant and led to a significant increase in insulin release (50% after 8h). However, the presence of PC stabilized the interface, hindering the lipolysis, and therefore no impact on the release profile was detected during the first 8h. Entrapment of TLL within the HII cylinders (with and without PC) drastically increased insulin release in both systems up to 100%. In the presence of PC insulin released faster and the structure was more stable. Consequently, the presence of lipases (inner or outer) both enhanced the destruction of the carrier, and provided sustained release of the entrapped insulin.
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Affiliation(s)
- Tehila Mishraki-Berkowitz
- The Ratner Chair in Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | - Guy Cohen
- Skin Research Institute, Dead-Sea & Arava Science Center, Ein Gedi, Israel
| | - Abraham Aserin
- The Ratner Chair in Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel
| | - Nissim Garti
- The Ratner Chair in Chemistry, Casali Institute of Applied Chemistry, The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem 9190401, Israel.
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15
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Angamuthu V, Chang WJ, Hou DR. Anti-addition of Dimethylsulfoxonium Methylide to Acyclic α,β-Unsaturated Ketones and Its Application in Formal Synthesis of an Eicosanoid. ACS OMEGA 2017; 2:4088-4099. [PMID: 31457710 PMCID: PMC6641733 DOI: 10.1021/acsomega.7b00663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 07/07/2017] [Indexed: 06/10/2023]
Abstract
Cyclopropanation using dimethylsulfoxonium methylide (Corey-Chaykovsky reaction) was examined with a series of linear α,β-unsaturated ketones, and the results showed that the major trajectory for the addition of the sulfur ylide to the enones is anti, related to the γ-substituent. The stereochemical assignment for the generated cyclopropanes was achieved by X-ray crystallography or comparing with the reported spectroscopic data. We found that the diastereoselectivity was influenced by several factors, including the protecting groups, solvents, and temperatures, and good anti/syn ratios (>10:1) were often obtained using the tert-butyldimethylsilyl and tert-butyldiphenylsilyl-protected substrates. The method was applied to a formal synthesis of a natural eicosanoid with good efficiency.
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16
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Ishchenko A, Peng L, Zinovev E, Vlasov A, Lee SC, Kuklin A, Mishin A, Borshchevskiy V, Zhang Q, Cherezov V. Chemically Stable Lipids for Membrane Protein Crystallization. CRYSTAL GROWTH & DESIGN 2017; 17:3502-3511. [PMID: 29290736 PMCID: PMC5743208 DOI: 10.1021/acs.cgd.7b00458] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Lipidic cubic phase (LCP) has been widely recognized as a promising membrane-mimicking matrix for biophysical studies of membrane proteins and their crystallization in a lipidic environment. Application of this material to a wide variety of membrane proteins, however, is hindered due to a limited number of available host lipids, mostly monoacylglycerols (MAGs). Here, we designed, synthesized and characterized a series of chemically stable lipids resistant to hydrolysis, with properties complementary to the widely used MAGs. In order to assess their potential to serve as host lipids for crystallization, we characterized the phase properties and lattice parameters of mesophases made of two most promising lipids at a variety of different conditions by polarized light microscopy and small-angle X-ray scattering. Both lipids showed remarkable chemical stability and an extended LCP region in the phase diagram covering a wide range of temperatures down to 4 °C. One of these lipids has been used for crystallization and structure determination of a prototypical membrane protein bacteriorhodopsin at 4 °C and 20 °C.
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Affiliation(s)
- Andrii Ishchenko
- Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, CA 90089, USA
| | - Lingling Peng
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Egor Zinovev
- Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
| | - Alexey Vlasov
- Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
| | - Sung Chang Lee
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Alexander Kuklin
- Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Russia
| | - Alexey Mishin
- Laboratory for Structural Biology of GPCRs, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Valentin Borshchevskiy
- Laboratory for Advanced Studies of Membrane Proteins, Moscow Institute of Physics and Technology (MIPT), Dolgoprudny, Russia
- Institute of Complex Systems (ICS-6): Structural Biochemistry, Research Centre Jülich, Germany
| | - Qinghai Zhang
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Vadim Cherezov
- Department of Chemistry, Bridge Institute, University of Southern California, Los Angeles, CA 90089, USA
- Laboratory for Structural Biology of GPCRs, Moscow Institute of Physics and Technology, Dolgoprudny, Russia
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17
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Lin Z, Liu S, Mao W, Tian H, Wang N, Zhang N, Tian F, Han L, Feng X, Mai Y. Tunable Self-Assembly of Diblock Copolymers into Colloidal Particles with Triply Periodic Minimal Surfaces. Angew Chem Int Ed Engl 2017; 56:7135-7140. [PMID: 28523856 DOI: 10.1002/anie.201702591] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 04/02/2017] [Indexed: 11/08/2022]
Abstract
We herein report the tunable self-assembly of simple block copolymers, namely polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymers, into porous cubosomes with inverse Im3‾m or Pn3‾m mesophases of controlled unit cell parameters as well as hexasomes with an inverse hexagonal (p6mm) structure, which have been rarely observed in polymer self-assembly. A new morphological phase diagram was constructed for the solution self-assembly of PS-b-PEO based on the volume fraction of the PS block against the initial copolymer concentration. The formation mechanisms of the cubosomes and hexasomes have also been revealed. This study not only affords a simple system for the controllable preparation and fundamental studies of ordered bicontinuous structures, but also opens up a new avenue towards porous architectures with highly ordered pores.
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Affiliation(s)
- Zhixing Lin
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Shaohua Liu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, 500 Dongchuan Road, Shanghai, 200241, China
| | - Wenting Mao
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Hao Tian
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Nan Wang
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Ninghe Zhang
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Feng Tian
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, 201204, China
| | - Lu Han
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
| | - Xinliang Feng
- Department of Chemistry and Food Chemistry, Technische Universität Dresden, Mommsenstrasse 4, 01062, Dresden, Germany
| | - Yiyong Mai
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China
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18
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Lin Z, Liu S, Mao W, Tian H, Wang N, Zhang N, Tian F, Han L, Feng X, Mai Y. Tunable Self-Assembly of Diblock Copolymers into Colloidal Particles with Triply Periodic Minimal Surfaces. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702591] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Zhixing Lin
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Shaohua Liu
- State Key Laboratory of Precision Spectroscopy; East China Normal University; 500 Dongchuan Road Shanghai 200241 China
| | - Wenting Mao
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Hao Tian
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Nan Wang
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Ninghe Zhang
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Feng Tian
- Shanghai Synchrotron Radiation Facility; Shanghai Institute of Applied Physics; Chinese Academy of Science; Shanghai 201204 China
| | - Lu Han
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
| | - Xinliang Feng
- Department of Chemistry and Food Chemistry; Technische Universität Dresden; Mommsenstrasse 4 01062 Dresden Germany
| | - Yiyong Mai
- School of Chemistry and Chemical Engineering; Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing; Shanghai Jiao Tong University; 800 Dongchuan Road Shanghai 200240 China
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19
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Ghanbari R, Assenza S, Saha A, Mezzenga R. Diffusion of Polymers through Periodic Networks of Lipid-Based Nanochannels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3491-3498. [PMID: 28304174 DOI: 10.1021/acs.langmuir.7b00437] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We present an experimental investigation of the diffusion of unfolded polymers in the triply-periodic water-channel network of inverse bicontinuous cubic phases. Depending on the chain size, our results indicate the presence of two different dynamical regimes corresponding to Zimm and Rouse diffusion. We support our findings by scaling arguments based on a combination of blob and effective-medium theories and suggest the presence of a third regime where dynamics is driven by reptation. Our experimental results also show an increasing behavior of the partition coefficient as a function of the polymer molecular weight, indicative of a reduction in the conformational degrees of freedom induced by the confinement.
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Affiliation(s)
- Reza Ghanbari
- Department of Health Sciences & Technology, ETH Zurich , Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland
| | - Salvatore Assenza
- Department of Health Sciences & Technology, ETH Zurich , Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland
| | - Abhijit Saha
- Department of Health Sciences & Technology, ETH Zurich , Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland
| | - Raffaele Mezzenga
- Department of Health Sciences & Technology, ETH Zurich , Schmelzbergstrasse 9, CH-8092 Zurich, Switzerland
- Department of Materials, ETH Zurich , Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland
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20
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Qiang X, Wang X, Ji Y, Li S, He L. Liquid-crystal self-assembly of lipid membranes on solutions: A dissipative particle dynamic simulation study. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.03.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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21
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Crystallogenesis of Membrane Proteins Mediated by Polymer-Bounded Lipid Nanodiscs. Structure 2017; 25:384-392. [DOI: 10.1016/j.str.2016.12.004] [Citation(s) in RCA: 114] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 09/20/2016] [Accepted: 12/12/2016] [Indexed: 11/20/2022]
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22
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Squires AM, Akbar S, Tousley ME, Rokhlenko Y, Singer JP, Osuji CO. Experimental Evidence for Proposed Transformation Pathway from the Inverse Hexagonal to Inverse Diamond Cubic Phase from Oriented Lipid Samples. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:7707-7711. [PMID: 26146884 DOI: 10.1021/acs.langmuir.5b01676] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A macroscopically oriented inverse hexagonal phase (HII) of the lipid phytantriol in water is converted to an oriented inverse double diamond bicontinuous cubic phase (QII(D)). The initial HII phase is uniaxially oriented about the long axis of a capillary with the cylinders parallel to the capillary axis. The HII phase is converted by cooling to a QII(D) phase which is also highly oriented, where the cylindrical axis of the former phase has been converted to a ⟨110⟩ axis in the latter, as demonstrated by small-angle X-ray scattering. This epitaxial relationship allows us to discriminate between two competing proposed geometric pathways to convert HII to QII(D). Our findings also suggest a new route to highly oriented cubic phase coatings, with applications as nanomaterial templates.
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Affiliation(s)
- Adam M Squires
- †Department of Chemistry, University of Reading, Whiteknights Campus, Reading, U.K. RG6 6AD
| | - Samina Akbar
- †Department of Chemistry, University of Reading, Whiteknights Campus, Reading, U.K. RG6 6AD
| | - Marissa E Tousley
- ‡Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Yekaterina Rokhlenko
- ‡Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Jonathan P Singer
- ‡Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
| | - Chinedum O Osuji
- ‡Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
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23
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An TH, La Y, Cho A, Jeong MG, Shin TJ, Park C, Kim KT. Solution self-assembly of block copolymers containing a branched hydrophilic block into inverse bicontinuous cubic mesophases. ACS NANO 2015; 9:3084-3096. [PMID: 25731603 DOI: 10.1021/nn507338s] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Solution self-assembly of amphiphilic block copolymers into inverse bicontinuous cubic mesophases is an emerging strategy for directly creating highly ordered triply periodic porous polymer nanostructures with large pore networks and desired surface functionalities. Although there have been recent reports on the formation of highly ordered triply periodic minimal surfaces of self-assembled block copolymer bilayers, the structural requirements for block copolymers in order to facilitate the preferential formation of such inverse mesophases in solution have not been fully investigated. In this study, we synthesized a series of model block copolymers, namely, branched poly(ethylene glycol)-block-polystyrene (bPEG-PS), to investigate the effect of the architecture of the block copolymers on their solution self-assembly into inverse mesophases consisting of the block copolymer bilayer. On the basis of the results, we suggest that the branched architecture of the hydrophilic block is a crucial structural requirement for the preferential self-assembly of the resulting block copolymers into inverse bicontinuous cubic phases. The internal crystalline lattice of the inverse bicontinuous cubic structure can be controlled via coassembly of branched and linear block copolymers. The results presented here provide design criteria for amphiphilic block copolymers to allow the formation of inverse bicontinuous cubic mesophases in solution. This may contribute to the direct synthesis of well-defined porous polymers with desired crystalline order in the porous networks and surface functionalities.
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Affiliation(s)
- Tae Hyun An
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
| | - Yunju La
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
| | - Arah Cho
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
| | - Moon Gon Jeong
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
| | - Tae Joo Shin
- ‡Pohang Accelerator Laboratory, POSTECH, Pohang 790-784, Korea
| | - Chiyoung Park
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
| | - Kyoung Taek Kim
- †Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST Road, Ulsan 689-798, Korea
- §KIST-UNIST-Ulsan Center for Convergence Materials, Ulsan 689-798, Korea
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