1
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Guitton-Spassky T, Junge F, Singh AK, Schade B, Achazi K, Maglione M, Sigrist S, Rashmi R, Haag R. Fluorinated dendritic amphiphiles, their stomatosome aggregates and application in enzyme encapsulation. NANOSCALE 2023; 15:7781-7791. [PMID: 37016756 DOI: 10.1039/d3nr00493g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Enzymes are more selective and efficient than synthetic catalysts but are limited by difficult recycling. This is overcome by immobilisation, namely through encapsulation, with the main drawback of this method being slow diffusion of products and reactants, resulting in effectively lowered enzyme activity. Fluorinated dendritic amphiphiles were reported to self-assemble into regularly perforated bilayer vesicles, so-called "stomatosomes". It was proposed that they could be promising novel reaction vessels due to their increased porosity while retaining larger biomolecules at the same time. Amphiphiles were synthesised and their aggregation was analysed by cryogenic transmission electron microscopy (cryo-TEM) and dynamic light scattering (DLS) in buffered conditions necessary for enzyme encapsulation. Urease and albumin were encapsulated using the thin-film hydration method and investigated by confocal and time-gated stimulated emission depletion microscopy (gSTED). Their release was then used to probe the selective retention of cargo by stomatosomes. Free and encapsulated enzyme activity were compared and their capacity to be reused was evaluated using the Berthelot method. Urease was successfully encapsulated, did not leak out at room temperature, and showed better activity in perforated vesicles than in closed vesicles without perforations. Encapsulated enzyme could be reused with retained activity over 8 cycles using centrifugation, while free enzyme had to be filtrated. These results show that stomatosomes may be used in enzyme immobilisation applications and present advantages over closed vesicles or free enzyme.
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Affiliation(s)
- Tiffany Guitton-Spassky
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
| | - Florian Junge
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
| | - Abhishek Kumar Singh
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
| | - Boris Schade
- Forschungszentrum für Elektronenmikroskopie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 36a, Berlin, 14195 Germany
| | - Katharina Achazi
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
| | - Marta Maglione
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
- Institute for Biology, Freie Universität Berlin, Takustraße 6, Berlin, 14195 Germany
| | - Stephan Sigrist
- Institute for Biology, Freie Universität Berlin, Takustraße 6, Berlin, 14195 Germany
| | - Rashmi Rashmi
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
| | - Rainer Haag
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustraße 3, Berlin, 14195 Germany.
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2
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Dolder N, Müller P, von Ballmoos C. Experimental platform for the functional investigation of membrane proteins in giant unilamellar vesicles. SOFT MATTER 2022; 18:5877-5893. [PMID: 35916307 PMCID: PMC9364335 DOI: 10.1039/d2sm00551d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Giant unilamellar vesicles (GUVs) are micrometer-sized model membrane systems that can be viewed directly under the microscope. They serve as scaffolds for the bottom-up creation of synthetic cells, targeted drug delivery and have been widely used to study membrane related phenomena in vitro. GUVs are also of interest for the functional investigation of membrane proteins that carry out many key cellular functions. A major hurdle to a wider application of GUVs in this field is the diversity of existing protocols that are optimized for individual proteins. Here, we compare PVA assisted and electroformation techniques for GUV formation under physiologically relevant conditions, and analyze the effect of immobilization on vesicle structure and membrane tightness towards small substrates and protons. There, differences in terms of yield, size, and leakage of GUVs produced by PVA assisted swelling and electroformation were found, dependent on salt and buffer composition. Using fusion of oppositely charged membranes to reconstitute a model membrane protein, we find that empty vesicles and proteoliposomes show similar fusion behavior, which allows for a rapid estimation of protein incorporation using fluorescent lipids.
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Affiliation(s)
- Nicolas Dolder
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Philipp Müller
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
| | - Christoph von Ballmoos
- Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.
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3
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Cawley JL, Blauch ME, Collins SM, Nice JB, Xie Q, Jordan LR, Brown AC, Wittenberg NJ. Nanoarrays of Individual Liposomes and Bacterial Outer Membrane Vesicles by Liftoff Nanocontact Printing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2103338. [PMID: 34655160 PMCID: PMC8678320 DOI: 10.1002/smll.202103338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/27/2021] [Indexed: 06/13/2023]
Abstract
Analytical characterization of small biological particles, such as extracellular vesicles (EVs), is complicated by their extreme heterogeneity in size, lipid, membrane protein, and cargo composition. Analysis of individual particles is essential for illuminating particle property distributions that are obscured by ensemble measurements. To enable high-throughput analysis of individual particles, liftoff nanocontact printing (LNCP) is used to define hexagonal antibody and toxin arrays that have a 425 nm dot size, on average, and 700 nm periodicity. The LNCP process is rapid, simple, and does not require access to specialized nanofabrication tools. These densely packed, highly ordered arrays are used to capture liposomes and bacterial outer membrane vesicles on the basis of their surface biomarkers, with a maximum of one particle per array dot, resulting in densely packed arrays of particles. Despite the high particle density, the underlying antibody or toxin array ensured that neighboring individual particles are optically resolvable. Provided target particle biomarkers and suitable capture molecules are identified, this approach can be used to generate high density arrays of a wide variety of small biological particles, including other types of EVs like exosomes.
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Affiliation(s)
- Jennie L Cawley
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA, 18015, USA
| | - Megan E Blauch
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA, 18015, USA
| | - Shannon M Collins
- Department of Chemical and Biomolecular Engineering, Lehigh University, 111 Research Drive, Bethlehem, PA, 18015, USA
| | - Justin B Nice
- Department of Chemical and Biomolecular Engineering, Lehigh University, 111 Research Drive, Bethlehem, PA, 18015, USA
| | - Qing Xie
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA, 18015, USA
| | - Luke R Jordan
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA, 18015, USA
| | - Angela C Brown
- Department of Chemical and Biomolecular Engineering, Lehigh University, 111 Research Drive, Bethlehem, PA, 18015, USA
| | - Nathan J Wittenberg
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA, 18015, USA
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4
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Sharifian Gh M. Recent Experimental Developments in Studying Passive Membrane Transport of Drug Molecules. Mol Pharm 2021; 18:2122-2141. [PMID: 33914545 DOI: 10.1021/acs.molpharmaceut.1c00009] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The ability to measure the passive membrane permeation of drug-like molecules is of fundamental biological and pharmaceutical importance. Of significance, passive diffusion across the cellular membranes plays an effective role in the delivery of many pharmaceutical agents to intracellular targets. Hence, approaches for quantitative measurement of membrane permeability have been the topics of research for decades, resulting in sophisticated biomimetic systems coupled with advanced techniques. In this review, recent developments in experimental approaches along with theoretical models for quantitative and real-time analysis of membrane transport of drug-like molecules through mimetic and living cell membranes are discussed. The focus is on time-resolved fluorescence-based, surface plasmon resonance, and second-harmonic light scattering approaches. The current understanding of how properties of the membrane and permeant affect the permeation process is discussed.
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Affiliation(s)
- Mohammad Sharifian Gh
- Department of Cell Biology, University of Virginia, Charlottesville, Virginia 22908, United States
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5
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Chimisso V, Maffeis V, Hürlimann D, Palivan CG, Meier W. Self-Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications. Macromol Biosci 2019; 20:e1900257. [PMID: 31549783 DOI: 10.1002/mabi.201900257] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/30/2019] [Indexed: 01/11/2023]
Abstract
Biomembranes play a crucial role in a multitude of biological processes, where high selectivity and efficiency are key points in the reaction course. The outstanding performance of biological membranes is based on the coupling between the membrane and biomolecules, such as membrane proteins. Polymer-based membranes and assemblies represent a great alternative to lipid ones, as their presence not only dramatically increases the mechanical stability of such systems, but also opens the scope to a broad range of chemical functionalities, which can be fine-tuned to selectively combine with a specific biomolecule. Tethering the membranes or nanoassemblies on a solid support opens the way to a class of functional surfaces finding application as sensors, biocomputing systems, molecular recognition, and filtration membranes. Herein, the design, physical assembly, and biomolecule attachment/insertion on/within solid-supported polymeric membranes and nanoassemblies are presented in detail with relevant examples. Furthermore, the models and applications for these materials are highlighted with the recent advances in each field.
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Affiliation(s)
- Vittoria Chimisso
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Dimitri Hürlimann
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
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6
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Park S, Jackman JA, Xu X, Weiss PS, Cho NJ. Micropatterned Viral Membrane Clusters for Antiviral Drug Evaluation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:13984-13990. [PMID: 30855935 DOI: 10.1021/acsami.9b01724] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The function of biological nanoparticles, such as membrane-enveloped viral particles, is often enhanced when the particles form higher-order supramolecular assemblies. While there is intense interest in developing biomimetic platforms that recapitulate these collective properties, existing platforms are limited to mimicking individual virus particles. Here, we present a micropatterning strategy to print linker molecules selectively onto bioinert surfaces, thereby enabling controlled tethering of biomimetic viral particle clusters across defined geometric patterns. By controlling the linker concentration, it is possible to tune the density of tethered particles within clusters while enhancing the signal intensity of encapsulated fluorescent markers. Time-resolved tracking of pore formation and membrane lysis revealed that an antiviral peptide can disturb clusters of the membrane-enclosed particles akin to the targeting of individual viral particles. This platform is broadly useful for evaluating the performance of membrane-active antiviral drug candidates, whereas the micropatterning strategy can be applied to a wide range of biological nanoparticles and other macromolecular entities.
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Affiliation(s)
- Soohyun Park
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Drive , Singapore 637553 , Singapore
| | | | - Xiaobin Xu
- California NanoSystems Institute, Department of Chemistry and Biochemistry, and Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095-7227 , United States
- School of Materials Science and Engineering , Tongji University , 1239 Siping Road , Shanghai 200092 , China
| | - Paul S Weiss
- California NanoSystems Institute, Department of Chemistry and Biochemistry, and Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095-7227 , United States
| | - Nam-Joon Cho
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Drive , Singapore 637553 , Singapore
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
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7
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Zhang M, Lemay SG. Interaction of Anionic Bulk Nanobubbles with Cationic Liposomes: Evidence for Reentrant Condensation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4146-4151. [PMID: 30811209 PMCID: PMC6427481 DOI: 10.1021/acs.langmuir.8b03927] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/25/2019] [Indexed: 06/09/2023]
Abstract
We investigated the interaction of bulk nanobubbles with cationic liposomes composed of 1,2-dioleoyl- sn-glycero-3-ethylphosphocholine and anionic liposomes assembled from 1-palmitoyl-2-oleoyl- sn-glycero-3-phospho-(1'- rac-glycerol). We employed dynamic light scattering and fluorescence microscopy to investigate both the hydrodynamic and electrophoretic properties of the nanobubble/liposome complexes. These optical techniques permit direct visualization of structural changes as a function of the bubble/liposome ratio. We observed reentrant condensation with cationic liposomes and gas nucleation with anionic liposomes. This is the first report of charge inversion and reentrant condensation of cationic liposomes induced by bulk nanobubbles.
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Affiliation(s)
- Minmin Zhang
- MESA+ Institute for Nanotechnology
& Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Serge G. Lemay
- MESA+ Institute for Nanotechnology
& Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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8
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Fusion assays for model membranes: a critical review. ADVANCES IN BIOMEMBRANES AND LIPID SELF-ASSEMBLY 2019. [DOI: 10.1016/bs.abl.2019.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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9
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Diederichs T, Nguyen QH, Urban M, Tampé R, Tornow M. Transparent Nanopore Cavity Arrays Enable Highly Parallelized Optical Studies of Single Membrane Proteins on Chip. NANO LETTERS 2018; 18:3901-3910. [PMID: 29741381 DOI: 10.1021/acs.nanolett.8b01252] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Membrane proteins involved in transport processes are key targets for pharmaceutical research and industry. Despite continuous improvements and new developments in the field of electrical readouts for the analysis of transport kinetics, a well-suited methodology for high-throughput characterization of single transporters with nonionic substrates and slow turnover rates is still lacking. Here, we report on a novel architecture of silicon chips with embedded nanopore microcavities, based on a silicon-on-insulator technology for high-throughput optical readouts. Arrays containing more than 14 000 inverted-pyramidal cavities of 50 femtoliter volumes and 80 nm circular pore openings were constructed via high-resolution electron-beam lithography in combination with reactive ion etching and anisotropic wet etching. These cavities feature both, an optically transparent bottom and top cap. Atomic force microscopy analysis reveals an overall extremely smooth chip surface, particularly in the vicinity of the nanopores, which exhibits well-defined edges. Our unprecedented transparent chip design provides parallel and independent fluorescent readout of both cavities and buffer reservoir for unbiased single-transporter recordings. Spreading of large unilamellar vesicles with efficiencies up to 96% created nanopore-supported lipid bilayers, which are stable for more than 1 day. A high lipid mobility in the supported membrane was determined by fluorescent recovery after photobleaching. Flux kinetics of α-hemolysin were characterized at single-pore resolution with a rate constant of 0.96 ± 0.06 × 10-3 s-1. Here, we deliver an ideal chip platform for pharmaceutical research, which features high parallelism and throughput, synergistically combined with single-transporter resolution.
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Affiliation(s)
- Tim Diederichs
- Institute of Biochemistry, Biocenter , Goethe University Frankfurt , Max-von-Laue-Str. 9 , 60438 Frankfurt/M. , Germany
| | - Quoc Hung Nguyen
- Molecular Electronics , Technical University of Munich , Theresienstrasse 90 , 80333 Munich , Germany
| | - Michael Urban
- Institute of Biochemistry, Biocenter , Goethe University Frankfurt , Max-von-Laue-Str. 9 , 60438 Frankfurt/M. , Germany
| | - Robert Tampé
- Institute of Biochemistry, Biocenter , Goethe University Frankfurt , Max-von-Laue-Str. 9 , 60438 Frankfurt/M. , Germany
- Cluster of Excellence Frankfurt (CEF) Macromolecular Complexes ; Goethe University Frankfurt , Max-von-Laue-Strasse 9 , 60438 Frankfurt/M. , Germany
| | - Marc Tornow
- Molecular Electronics , Technical University of Munich , Theresienstrasse 90 , 80333 Munich , Germany
- Fraunhofer Research Institution for Microsystems and Solid State Technologies (EMFT) , Hansastrasse 27d , 80686 Munich , Germany
- Center for NanoScience (CeNS) , Ludwig-Maximilians-University , Geschwister-Scholl Platz 1 , 80539 Munich , Germany
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10
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Zheng H, Li X, Jia Q. Design of pH-Responsive Polymer Monolith Based on Cyclodextrin Vesicle for Capture and Release of Myoglobin. ACS APPLIED MATERIALS & INTERFACES 2018; 10:5909-5917. [PMID: 29364646 DOI: 10.1021/acsami.7b18999] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
β-Cyclodextrin vesicles (CDVs) were first introduced into the polymer monolith to prepare a pH-responsive adsorption material and used for capture and release of a cardiac biomarker, myoglobin (Myo). SH-CDV was decorated with adamantane-modified SH-octapeptide to enhance the encapsulation and release rates of Myo. Afterward, SH-CDV was introduced into the polymer monolith via click reaction to produce a pH-responsive monolith. Combining with the mass spectrometry detection, the CDV-based pH-responsive monolith was used for the enrichment of Myo glycopeptides from the mixture of glycopeptides and nonglycoprotein (bovine serum albumin) tryptsin digests reach up to 1:10 000. A limit of detection of 0.1 fmol was obtained for Myo glycopeptides in the blood sample, indicating the high sensitivity of the method. The prepared CDV-based hybrid monolith demonstrated itself to be a promising material for capture of glycoproteins in complex samples, which provides an efficient strategy for the identification and discovery of biomarkers of acute myocardial infarction.
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Affiliation(s)
- Haijiao Zheng
- College of Chemistry, Jilin University , Changchun 130012, China
| | - Xiqian Li
- China-Japan Hospital of Jilin University , Changchun 130033, China
| | - Qiong Jia
- College of Chemistry, Jilin University , Changchun 130012, China
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11
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Zhang Y, Xuan S, Owoseni O, Omarova M, Li X, Saito ME, He J, McPherson GL, Raghavan SR, Zhang D, John VT. Amphiphilic Polypeptoids Serve as the Connective Glue to Transform Liposomes into Multilamellar Structures with Closely Spaced Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2780-2789. [PMID: 28248521 DOI: 10.1021/acs.langmuir.6b04190] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the ability of hydrophobically modified polypeptoids (HMPs), which are amphiphilic pseudopeptidic macromolecules, to connect across lipid bilayers and thus form layered structures on liposomes. The HMPs are obtained by attaching hydrophobic decyl groups at random points along the polypeptoid backbone. Although native polypeptoids (with no hydrophobes) have no effect on liposomal structure, the HMPs remodel the unilamellar liposomes into structures with comparable diameters but with multiple concentric bilayers. The transition from single-bilayer to multiple-bilayer structures is revealed by small-angle neutron scattering (SANS) and cryo-transmission electron microscopy (cryo-TEM). The spacing between bilayers is found to be relatively uniform at ∼6.7 nm. We suggest that the amphiphilic nature of the HMPs explains the formation of multibilayered liposomes; i.e., the HMPs insert their hydrophobic tails into adjacent bilayers and thereby serve as the connective glue between bilayers. At higher HMP concentrations, the liposomes are entirely disrupted into much smaller micellelike structures through extensive hydrophobe insertion. Interestingly, these small structures can reattach to fresh unilamellar liposomes and self-assemble to form new two-bilayer liposomes. The two-bilayer liposomes in our study are reminiscent of two-bilayer organelles such as the nucleus in eukaryotic cells. The observations have significance in designing new nanoscale drug delivery carriers with multiple drugs on separate lipid bilayers and extending liposome circulation times with entirely biocompatible materials.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Srinivasa R Raghavan
- Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742, United States
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12
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Dwivedi AK, Singh R, Singh A, Wei KH, Wu CY, Lyu PC, Lin HC. Novel Water-Soluble Cyclodextrin-Based Conjugated Polymer for Selective Host–Guest Interactions of Cationic Surfactant CTAB and Reverse FRET with Rhodamine B Tagged Adamantyl Guest. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00789] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Atul Kumar Dwivedi
- Department
of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Ravinder Singh
- Department
of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Ashutosh Singh
- Department
of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Kung-Hwa Wei
- Department
of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Chu-Ya Wu
- Institute
of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Ping-Chiang Lyu
- Institute
of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu 300, Taiwan
| | - Hong-Cheu Lin
- Department
of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
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13
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Sørensen TJ, Shi D, Laursen BW. Tetramethoxy-Aminorhodamine (TMARh): A Bichromophore, an Improved Fluorophore, and a pH Switch. Chemistry 2016; 22:7046-9. [PMID: 26995766 DOI: 10.1002/chem.201600496] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Indexed: 11/12/2022]
Abstract
Rhodamine is one of the most widely used fluorescent dyes. Here, a new synthetic pathway to the popular dyes is reported and the effect of adding four methoxy groups to the molecular structure is investigated. Tetramethoxy-aminorhodamine (TMARh) is found to show superior pH switching compared to the rhodamine without the four methoxy groups, owing to changed properties of the dark "off" state and increased fluorescence intensity in the protonated "on" state.
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Affiliation(s)
- Thomas Just Sørensen
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
| | - Dong Shi
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark
| | - Bo W Laursen
- Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, København Ø, Denmark.
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14
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Lira RB, Steinkühler J, Knorr RL, Dimova R, Riske KA. Posing for a picture: vesicle immobilization in agarose gel. Sci Rep 2016; 6:25254. [PMID: 27140695 PMCID: PMC4853705 DOI: 10.1038/srep25254] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 04/13/2016] [Indexed: 01/14/2023] Open
Abstract
Taking a photo typically requires the object of interest to stand still. In science, imaging is potentiated by optical and electron microscopy. However, living and soft matter are not still. Thus, biological preparations for microscopy usually include a fixation step. Similarly, immobilization strategies are required for or substantially facilitate imaging of cells or lipid vesicles, and even more so for acquiring high-quality data via fluorescence-based techniques. Here, we describe a simple yet efficient method to immobilize objects such as lipid vesicles with sizes between 0.1 and 100 μm using agarose gel. We show that while large and giant unilamellar vesicles (LUVs and GUVs) can be caged in the pockets of the gel meshwork, small molecules, proteins and micelles remain free to diffuse through the gel and interact with membranes as in agarose-free solutions, and complex biochemical reactions involving several proteins can proceed in the gel. At the same time, immobilization in agarose has no adverse effect on the GUV size and stability. By applying techniques such as FRAP and FCS, we show that the lateral diffusion of lipids is not affected by the gel. Finally, our immobilization strategy allows capturing high-resolution 3D images of GUVs.
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Affiliation(s)
- Rafael B. Lira
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo, Brazil
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Jan Steinkühler
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Roland L. Knorr
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Rumiana Dimova
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Potsdam, Germany
| | - Karin A. Riske
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo, Brazil
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15
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Christensen SM, Triplet MG, Rhodes C, Iwig JS, Tu HL, Stamou D, Groves JT. Monitoring the Waiting Time Sequence of Single Ras GTPase Activation Events Using Liposome Functionalized Zero-Mode Waveguides. NANO LETTERS 2016; 16:2890-5. [PMID: 27013033 PMCID: PMC5515077 DOI: 10.1021/acs.nanolett.6b00969] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Activation of small GTPases of the Ras superfamily by guanine nucleotide exchange factors (GEFs) is a key step in numerous cell signaling processes. Unveiling the detailed molecular mechanisms of GEF-GTPase signaling interactions is of great importance due to their central roles in cell biology, including critical disease states, and their potential as therapeutic targets. Here we present an assay to monitor individual Ras activation events catalyzed by single molecules of the GEF Son of Sevenless (SOS) in the natural membrane environment. The assay employs zero-mode waveguide (ZMW) nanostructures containing a single Ras-functionalized liposome. The ZMWs facilitate highly localized excitation of fluorophores in the vicinity of the liposome membrane, allowing direct observation of individual Ras activation events as single SOS enzymes catalyze exchange of unlabeled nucleotides bound to Ras with fluorescently labeled nucleotides from solution. The system is compatible with continuous recording of long sequences of individual enzymatic turnover events over hour-long time scales. The single turnover waiting time sequence is a molecular footprint that details the temporal characteristics of the system. Data reported here reveal long-lived activity states that correspond to well-defined conformers of SOS at the membrane. Liposome functionalized ZMWs allow for studies of nucleotide exchange reactions at single GTPase resolution, providing a platform to gauge the mechanisms of these processes.
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Affiliation(s)
- Sune M. Christensen
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Meredith G. Triplet
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Christopher Rhodes
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Jeffrey S. Iwig
- Howard Hughes Medical Institute, Department of Molecular and Cell Biology, University of California, Berkeley, California 94720, United States
| | - Hsiung-Lin Tu
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Dimitrios Stamou
- Department of Chemistry and Nano-Science Center, University of Copenhagen, Copenhagen, Denmark
| | - Jay T. Groves
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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16
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Sun T, Shu L, Shen J, Ruan C, Zhao Z, Jiang C. Photo and redox-responsive vesicles assembled from Bola-type superamphiphiles. RSC Adv 2016. [DOI: 10.1039/c6ra05808f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Photo and redox-responsive vesicles assembled from “Bola-type” superamphiphiles were developed.
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Affiliation(s)
- Tao Sun
- Key Laboratory of Smart Drug Delivery (Ministry of Education)
- State Key Laboratory of Medical Neurobiology
- Department of Pharmaceutics
- School of Pharmacy
- Fudan University
| | - Lan Shu
- Key Laboratory of Smart Drug Delivery (Ministry of Education)
- State Key Laboratory of Medical Neurobiology
- Department of Pharmaceutics
- School of Pharmacy
- Fudan University
| | - Jian Shen
- School of Chemistry and Chemical Engineering
- Weifang University
- Weifang 261061
- PR China
| | - Chunhui Ruan
- Key Laboratory of Smart Drug Delivery (Ministry of Education)
- State Key Laboratory of Medical Neurobiology
- Department of Pharmaceutics
- School of Pharmacy
- Fudan University
| | - Zhifeng Zhao
- Key Laboratory of Smart Drug Delivery (Ministry of Education)
- State Key Laboratory of Medical Neurobiology
- Department of Pharmaceutics
- School of Pharmacy
- Fudan University
| | - Chen Jiang
- Key Laboratory of Smart Drug Delivery (Ministry of Education)
- State Key Laboratory of Medical Neurobiology
- Department of Pharmaceutics
- School of Pharmacy
- Fudan University
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17
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Agnarsson B, Lundgren A, Gunnarsson A, Rabe M, Kunze A, Mapar M, Simonsson L, Bally M, Zhdanov VP, Höök F. Evanescent Light-Scattering Microscopy for Label-Free Interfacial Imaging: From Single Sub-100 nm Vesicles to Live Cells. ACS NANO 2015; 9:11849-11862. [PMID: 26517791 DOI: 10.1021/acsnano.5b04168] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Advancement in the understanding of biomolecular interactions has benefited greatly from the development of surface-sensitive bioanalytical sensors. To further increase their broad impact, significant efforts are presently being made to enable label-free and specific biomolecule detection with high sensitivity, allowing for quantitative interpretation and general applicability at low cost. In this work, we have addressed this challenge by developing a waveguide chip consisting of a flat silica core embedded in a symmetric organic cladding with a refractive index matching that of water. This is shown to reduce stray light (background) scattering and thereby allow for label-free detection of faint objects, such as individual sub-20 nm gold nanoparticles as well as sub-100 nm lipid vesicles. Measurements and theoretical analysis revealed that light-scattering signals originating from single surface-bound lipid vesicles enable characterization of their sizes without employing fluorescent lipids as labels. The concept is also demonstrated for label-free measurements of protein binding to and enzymatic (phospholipase A2) digestion of individual lipid vesicles, enabling an analysis of the influence on the measured kinetics of the dye-labeling of lipids required in previous assays. Further, diffraction-limited imaging of cells (platelets) binding to a silica surface showed that distinct subcellular features could be visualized and temporally resolved during attachment, activation, and spreading. Taken together, these results underscore the versatility and general applicability of the method, which due to its simplicity and compatibility with conventional microscopy setups may reach a widespread in life science and beyond.
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Affiliation(s)
- Björn Agnarsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Anders Lundgren
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Anders Gunnarsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Michael Rabe
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Angelika Kunze
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
- Institute of Physical Chemistry, University of Göttingen , D-37077 Göttingen, Germany
| | - Mokhtar Mapar
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Lisa Simonsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Marta Bally
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Vladimir P Zhdanov
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
- Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Fredrik Höök
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
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18
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19
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Arora JS, Ponnusamy T, Zheng R, Venkataraman P, Raghavan SR, Blake D, John VT. Spatially directed vesicle capture in the ordered pores of breath-figure polymer films. SOFT MATTER 2015; 11:5188-5191. [PMID: 26021456 DOI: 10.1039/c5sm01068c] [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
This work describes a new method to selectively capture liposomes and other vesicle entities in the patterned pores of breath-figure polymer films. The process involves the deposition of a hydrophobe containing biopolymer in the pores of the breath figure, and the tethering of vesicles to the biopolymer through hydrophobic interactions. The process is versatile, can be scaled up and extended to the deposition of other functional materials in the pores of breath figures.
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Affiliation(s)
- J S Arora
- Department of Chemical and Biomolecular Engineering, Tulane University, New Orleans, LA 70118, USA.
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20
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Li S, Zhang L, Wang B, Ma M, Xing P, Chu X, Zhang Y, Hao A. An easy approach for constructing vesicles by using aromatic molecules with β-cyclodextrin. SOFT MATTER 2015; 11:1767-1777. [PMID: 25608115 DOI: 10.1039/c4sm02339k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Vesicles were formed in aqueous solution using β-cyclodextrin (β-CD) complexes with a series of ultra-small aromatic molecules. The vesicles are easy to prepare without a complicated synthesis procedure and their structure was identified and characterized using various techniques, including transmission electron microscopy, atomic force microscopy and dynamic laser light scattering. Using the β-CD/l-phenylalanine system as a representative example, the structural factors that caused the self-assembly were revealed using proton nuclear magnetic resonance, Fourier transform infrared spectroscopy and X-ray diffraction. In addition, the vesicular architecture could be endowed with a diverse range of stimuli-responses, as a consequence of the selective addition of various guest molecules. It is anticipated that this novel assembly strategy could be further extended, and that it presents new opportunities for the development of nanocarriers and soft materials.
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Affiliation(s)
- Shangyang Li
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, PR China.
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21
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Tabaei SR, Cho NJ. Lamellar sheet exfoliation of single lipid vesicles by a membrane-active peptide. Chem Commun (Camb) 2015; 51:10272-5. [DOI: 10.1039/c5cc02769a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using total internal fluorescence microscopy, highly parallel measurements of single lipid vesicles unexpectedly reveal that a small fraction of vesicles rupture in multiple discrete steps when destabilized by a membrane-active peptide which is in contrast to classical solubilization models.
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Affiliation(s)
- Seyed R. Tabaei
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
| | - N. J. Cho
- School of Materials Science and Engineering
- Nanyang Technological University
- Singapore
- Centre for Biomimetic Sensor Science
- Nanyang Technological University
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22
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Cho E, Jeong D, Paik SR, Jung S. Rod and Vesicular Structures of Cyclosophoraose-Based Ionic Self-assembly. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.8.2537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Ma M, Guan Y, Zhang C, Hao J, Xing P, Su J, Li S, Chu X, Hao A. Stimulus-responsive supramolecular vesicles with effective anticancer activity prepared by cyclodextrin and ftorafur. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.04.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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25
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Leney AC, Fan X, Kitova EN, Klassen JS. Nanodiscs and Electrospray Ionization Mass Spectrometry: A Tool for Screening Glycolipids Against Proteins. Anal Chem 2014; 86:5271-7. [DOI: 10.1021/ac4041179] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aneika C. Leney
- Alberta Glycomics Centre
and Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Xuxin Fan
- Alberta Glycomics Centre
and Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Elena N. Kitova
- Alberta Glycomics Centre
and Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - John S. Klassen
- Alberta Glycomics Centre
and Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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26
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List J, Weber M, Simmel FC. Hydrophobes Schalten einer doppellagigen DNA-Origami-Struktur. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201310259] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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27
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List J, Weber M, Simmel FC. Hydrophobic actuation of a DNA origami bilayer structure. Angew Chem Int Ed Engl 2014; 53:4236-9. [PMID: 24616083 DOI: 10.1002/anie.201310259] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Indexed: 01/07/2023]
Abstract
Amphiphilic compounds have a strong tendency to form aggregates in aqueous solutions. It is shown that such aggregation can be utilized to fold cholesterol-modified, single-layered DNA origami structures into sandwich-like bilayer structures, which hide the cholesterol modifications in their interior. The DNA bilayer structures unfold after addition of the surfactant Tween 80, and also in the presence of lipid bilayer membranes, with opening kinetics well described by stretched exponentials. It is also demonstrated that by combination with an appropriate lock and key mechanism, hydrophobic actuation of DNA sandwiches can be made conditional on the presence of an additional molecular input such as a specific DNA sequence.
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Affiliation(s)
- Jonathan List
- Lehrstuhl für Systembiophysik, Physik-Department - E14 und ZNN-WSI, Technische Universität München, Am Coulombwall 4a, 85748 Garching (Germany) http://www.e14.ph.tum.de
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28
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Controllable self-assembly of an amphiphilic drug with β-cyclodextrin and α-amylase. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.01.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Yildiz UH, De Hoog HPM, Fu Z, Tomczak N, Parikh AN, Nallani M, Liedberg B. Third-party ATP sensing in polymersomes: a label-free assay of enzyme reactions in vesicular compartments. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:442-7, 441. [PMID: 23963775 DOI: 10.1002/smll.201300060] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 05/28/2013] [Indexed: 05/02/2023]
Affiliation(s)
- Umit Hakan Yildiz
- Centre for Biomimetic Sensor Science, School of Materials Science & Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore, 6375532
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30
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JØRGENSEN SUNEK, HATZAKIS NIKOSS. INSIGHTS IN ENZYME FUNCTIONAL DYNAMICS AND ACTIVITY REGULATION BY SINGLE MOLECULE STUDIES. ACTA ACUST UNITED AC 2014. [DOI: 10.1142/s1793048013300028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The advent of advanced single molecule measurements heralded the arrival of a wealth of dynamic information revolutionizing our understanding of protein dynamics and behavior in ways not deducible by conventional bulk assays. They offered the direct observation and quantification of the abundance and life time of multiple states and transient intermediates in the energy landscape that are typically averaged out in non-synchronized ensemble measurements, thus providing unprecedented insights into complex biological processes. Here we survey the current state of the art in single-molecule fluorescence microscopy methodology for studying the mechanism of enzymatic activity and the insights on protein functional dynamics. We will initially discuss the strategies employed to date, their limitations and possible ways to overcome them, and finally how single enzyme kinetics can advance our understanding on mechanisms underlying function and regulation of proteins. [Formula: see text]Special Issue Comment: This review focuses on functional dynamics of individual enzymes and is related to the review on ion channels by Lu,44 the reviews on mathematical treatment of Flomenbom45 and Sach et al.,46 and review on FRET by Ruedas-Rama et al.41
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Affiliation(s)
- SUNE K. JØRGENSEN
- Bio-Nanotechnology Laboratory, Department of Chemistry, Nano-Science Center, Lundbeck Foundation Center, Biomembranes in Nanomedicine University of Copenhagen, 2100 Copenhagen, Denmark
| | - NIKOS S. HATZAKIS
- Bio-Nanotechnology Laboratory, Department of Chemistry, Nano-Science Center, Lundbeck Foundation Center, Biomembranes in Nanomedicine University of Copenhagen, 2100 Copenhagen, Denmark
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31
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Fenz SF, Sachse R, Schmidt T, Kubick S. Cell-free synthesis of membrane proteins: tailored cell models out of microsomes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1838:1382-8. [PMID: 24370776 DOI: 10.1016/j.bbamem.2013.12.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 11/27/2013] [Accepted: 12/16/2013] [Indexed: 10/25/2022]
Abstract
Incorporation of proteins in biomimetic giant unilamellar vesicles (GUVs) is one of the hallmarks towards cell models in which we strive to obtain a better mechanistic understanding of the manifold cellular processes. The reconstruction of transmembrane proteins, like receptors or channels, into GUVs is a special challenge. This procedure is essential to make these proteins accessible to further functional investigation. Here we describe a strategy combining two approaches: cell-free eukaryotic protein expression for protein integration and GUV formation to prepare biomimetic cell models. The cell-free protein expression system in this study is based on insect lysates, which provide endoplasmic reticulum derived vesicles named microsomes. It enables signal-induced translocation and posttranslational modification of de novo synthesized membrane proteins. Combining these microsomes with synthetic lipids within the electroswelling process allowed for the rapid generation of giant proteo-liposomes of up to 50 μm in diameter. We incorporated various fluorescent protein-labeled membrane proteins into GUVs (the prenylated membrane anchor CAAX, the heparin-binding epithelial growth factor like factor Hb-EGF, the endothelin receptor ETB, the chemokine receptor CXCR4) and thus presented insect microsomes as functional modules for proteo-GUV formation. Single-molecule fluorescence microscopy was applied to detect and further characterize the proteins in the GUV membrane. To extend the options in the tailoring cell models toolbox, we synthesized two different membrane proteins sequentially in the same microsome. Additionally, we introduced biotinylated lipids to specifically immobilize proteo-GUVs on streptavidin-coated surfaces. We envision this achievement as an important first step toward systematic protein studies on technical surfaces.
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Affiliation(s)
- Susanne F Fenz
- Leiden Institute of Physics, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
| | - Rita Sachse
- Fraunhofer IBMT, Branch Potsdam-Golm, Group of Cell-free Protein Synthesis, Am Mühlenberg 13, 14476 Potsdam, Germany
| | - Thomas Schmidt
- Leiden Institute of Physics, Leiden University, PO Box 9504, 2300 RA Leiden, The Netherlands
| | - Stefan Kubick
- Fraunhofer IBMT, Branch Potsdam-Golm, Group of Cell-free Protein Synthesis, Am Mühlenberg 13, 14476 Potsdam, Germany.
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32
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Christensen AL, Lohr C, Christensen SM, Stamou D. Single vesicle biochips for ultra-miniaturized nanoscale fluidics and single molecule bioscience. LAB ON A CHIP 2013; 13:3613-3625. [PMID: 23856986 DOI: 10.1039/c3lc50492a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
One of the major bottlenecks in the development of biochips is maintaining the structure and function of biomolecules when interfacing them with hard matter (glass, plastics, metals, etc.), a challenge that is exacerbated during miniaturization that inevitably increases the interface to volume ratio of these devices. Biochips based on immobilized vesicles circumvent this problem by encapsulating biomolecules in the protective environment of a lipid bilayer, thus minimizing interactions with hard surfaces. Here we review the development of biochips based on arrays of single nanoscale vesicles, their fabrication via controlled self-assembly, and their characterization using fluorescence microscopy. We also highlight their applications in selected fields such as nanofluidics and single molecule bioscience. Despite their great potential for improved biocompatibility, extreme miniaturization and high throughput, single vesicle biochips are still a niche technology that has yet to establish its commercial relevance.
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Affiliation(s)
- Andreas L Christensen
- Bionanotechnology and Nanomedicine Laboratory, Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
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33
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Bera LK, Ong KS, Wong ZZ, Fu Z, Nallani M, Shea SO. Trapping of vesicles on patterned surfaces by physisorption for potential biosensing applications. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2012:6563-7. [PMID: 23367433 DOI: 10.1109/embc.2012.6347498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The pre-defined selective positioning of a controlled number of vesicles on a rigid substrate is crucial in many potential applications such as diagnostics, biosensors, lab-on-a chip, microanalyses and reaction chambers. In this paper, the vesicles made up of block copolymer using Poly [-(2-methyloxazoline) -poly- (dimethylsiloxane)-poly- (2-methyloxazoline)] (ABA) with dimensions of 100-200 nm are trapped by physisorption on hydrophilic surfaces. We discuss the protocols established for vesicle trapping. The optimum conditions obtained for physisorption is 15 minutes incubation followed by one cycle of DI water rinse. Trapping of 1-10 vesicles in lobe shape micro-wells fabricated by photo lithography using photoresist on UltraStick(™) slides was demonstrated. To overcome the issue of amalgamation of emitted light from optically sensitive photoresist and fluorescently tagged vesicles, an alternative approach of Si/SiO(2) microwell array coupled with APTES (3-AminoPropylTriEthoxySilane) treated bottom surfaces was developed.
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Affiliation(s)
- L K Bera
- Institute of Materials Research and Engineering, Agency forScience, Technology and Research, 3 Research Link, Singapore
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34
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Li S, Sun T, Yang X, Wang B, Xing P, Hou Y, Su J, Hao A. Light-responsive drug carrier vesicles assembled by cinnamic acid-based peptide. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3005-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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35
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Carbonell C, Stylianou KC, Hernando J, Evangelio E, Barnett SA, Nettikadan S, Imaz I, Maspoch D. Femtolitre chemistry assisted by microfluidic pen lithography. Nat Commun 2013; 4:2173. [PMID: 23863998 PMCID: PMC3759056 DOI: 10.1038/ncomms3173] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Accepted: 06/19/2013] [Indexed: 11/25/2022] Open
Abstract
Chemical reactions at ultrasmall volumes are becoming increasingly necessary to study biological processes, to synthesize homogenous nanostructures and to perform high-throughput assays and combinatorial screening. Here we show that a femtolitre reaction can be realized on a surface by handling and mixing femtolitre volumes of reagents using a microfluidic stylus. This method, named microfluidic pen lithography, allows mixing reagents in isolated femtolitre droplets that can be used as reactors to conduct independent reactions and crystallization processes. This strategy overcomes the high-throughput limitations of vesicles and micelles and obviates the usually costly step of fabricating microdevices and wells. We anticipate that this process enables performing distinct reactions (acid-base, enzymatic recognition and metal-organic framework synthesis), creating multiplexed nanoscale metal-organic framework arrays, and screening combinatorial reactions to evaluate the crystallization of novel peptide-based materials.
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Affiliation(s)
- Carlos Carbonell
- ICN2—Institut Catala de Nanociencia i Nanotecnologia, Esfera UAB, 08193 Bellaterra (Barcelona), Spain
| | - Kyriakos C. Stylianou
- ICN2—Institut Catala de Nanociencia i Nanotecnologia, Esfera UAB, 08193 Bellaterra (Barcelona), Spain
| | - Jordi Hernando
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | - Emi Evangelio
- ICN2—Institut Catala de Nanociencia i Nanotecnologia, Esfera UAB, 08193 Bellaterra (Barcelona), Spain
| | - Sarah A. Barnett
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OXII ODE, UK
| | - Saju Nettikadan
- NanoInk Inc., Illinois Science and Technology Park, Skokie, IL 60077 USA
| | - Inhar Imaz
- ICN2—Institut Catala de Nanociencia i Nanotecnologia, Esfera UAB, 08193 Bellaterra (Barcelona), Spain
| | - Daniel Maspoch
- ICN2—Institut Catala de Nanociencia i Nanotecnologia, Esfera UAB, 08193 Bellaterra (Barcelona), Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08100 Barcelona, Spain
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36
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Sun T, Shen J, Yan H, Hao J, Hao A. Stable vesicles assembled by “supramolecular amphiphiles” with double hydrophobic chains. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.08.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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37
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Sarmento M, Prieto M, Fernandes F. Reorganization of lipid domain distribution in giant unilamellar vesicles upon immobilization with different membrane tethers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2012; 1818:2605-15. [DOI: 10.1016/j.bbamem.2012.05.028] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Revised: 05/22/2012] [Accepted: 05/25/2012] [Indexed: 10/28/2022]
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38
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Voskuhl J, Wendeln C, Versluis F, Fritz EC, Roling O, Zope H, Schulz C, Rinnen S, Arlinghaus HF, Ravoo BJ, Kros A. Immobilisierung von Liposomen und Vesikeln auf strukturierten Oberflächen mithilfe eines Coiled-Coil-Peptidbindungsmotivs. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Voskuhl J, Wendeln C, Versluis F, Fritz EC, Roling O, Zope H, Schulz C, Rinnen S, Arlinghaus HF, Ravoo BJ, Kros A. Immobilization of Liposomes and Vesicles on Patterned Surfaces by a Peptide Coiled-Coil Binding Motif. Angew Chem Int Ed Engl 2012; 51:12616-20. [DOI: 10.1002/anie.201204836] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Indexed: 11/10/2022]
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40
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Sakaino H, Sawayama J, Kabashima SI, Yoshikawa I, Araki K. Dry Micromanipulation of Supramolecular Giant Vesicles on a Silicon Substrate: Highly Stable Hydrogen-Bond-Directed Nanosheet Membrane. J Am Chem Soc 2012; 134:15684-7. [DOI: 10.1021/ja307231u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hirotoshi Sakaino
- Institute
of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo
153-8505, Japan
| | - Jun Sawayama
- Institute
of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo
153-8505, Japan
| | - Shin-ichiro Kabashima
- Institute
of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo
153-8505, Japan
- Functional
Materials Research
Laboratories, Lion Corporation, 7-2-1 Hirai,
Edogawa-ku, Tokyo 132-0035, Japan
| | - Isao Yoshikawa
- Institute
of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo
153-8505, Japan
| | - Koji Araki
- Institute
of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo
153-8505, Japan
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41
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Nanotechnology-Based Biosensors and Diagnostics: Technology Push versus Industrial/Healthcare Requirements. BIONANOSCIENCE 2012. [DOI: 10.1007/s12668-012-0047-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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42
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Pedersen SL, Bhatia VK, Jurt S, Paulsson JF, Pedersen MH, Jorgensen R, Holst B, Stamou D, Vrang N, Zerbe O, Jensen KJ. Improving membrane binding as a design strategy for amphipathic peptide hormones: 2-helix variants of PYY3-36. J Pept Sci 2012; 18:579-87. [DOI: 10.1002/psc.2436] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 06/06/2012] [Indexed: 12/20/2022]
Affiliation(s)
- Søren L. Pedersen
- Department of Chemistry, Faculty of Science; University of Copenhagen; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
- The Lundbeck Foundation Center for Biomembranes in Nanomedicine; Unversity of Copenhagen; Denmark
| | - Vikram K. Bhatia
- Faculty of Health Sciences; University of Copenhagen; Blegdamsvej 3B 2200 Copenhagen N Denmark
- Novozymes A/S; Bagsvaerd Denmark
| | - Simon Jurt
- Institute of Organic Chemistry; University of Zurich; Winterthurerstrasse 190 CH 8057 Zurich Switzerland
| | | | - Maria H. Pedersen
- Department of Chemistry, Faculty of Science; University of Copenhagen; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
| | | | - Birgitte Holst
- Faculty of Health Sciences; University of Copenhagen; Blegdamsvej 3B 2200 Copenhagen N Denmark
| | - Dimitrios Stamou
- Department of Chemistry, Faculty of Science; University of Copenhagen; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
- The Lundbeck Foundation Center for Biomembranes in Nanomedicine; Unversity of Copenhagen; Denmark
| | - Niels Vrang
- gubra Aps; Agern Allé 1 2970 Hørsholm Denmark
| | - Oliver Zerbe
- Institute of Organic Chemistry; University of Zurich; Winterthurerstrasse 190 CH 8057 Zurich Switzerland
| | - Knud J. Jensen
- Department of Chemistry, Faculty of Science; University of Copenhagen; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
- The Lundbeck Foundation Center for Biomembranes in Nanomedicine; Unversity of Copenhagen; Denmark
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43
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Wang LG, Zhan TG, Zhao X, Jiang XK, Li ZT. p-Phenyleneethynylene-based comb-like oligomers: the synthesis and self-assembling property. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Sun T, Guo Q, Zhang C, Hao J, Xing P, Su J, Li S, Hao A, Liu G. Self-assembled vesicles prepared from amphiphilic cyclodextrins as drug carriers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:8625-8636. [PMID: 22607559 DOI: 10.1021/la301497t] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Controlled self-assembly of amphiphilic cyclodextrin is always a challenging topic in the field of supramolecular chemistry, since it provides the spontaneous generation of well-defined aggregation with functional host sites with great potential applications in drug-carrier systems. β-Cyclodextrin modified with an anthraquinone moiety (1) was successfully synthesized. In the aqueous solution, 1 was found able to self-assemble into vesicles, which was characterized in detail by TEM, SEM, EFM, and DLS. The formation mechanism of the vesicles was suggested based on the 2D ROESY and UV-vis results, and further verified by the MD simulation. Subsequently, the stimuli response property of the vesicles, including to Cu(2+) and H(+), was also studied. The vesicles can efficiently load Paclitaxel inside the membrane with functional macrocyclic cavities available, which can further carry small molecules, such as ferrocene. The vesicles loading with Paclitaxel have remarkable anticancer effects. This work will provide new strategy in drug-carrier systems and tumor treatment methods.
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Affiliation(s)
- Tao Sun
- School of Chemistry & Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan 250100, PR China
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45
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Liposomal glyco-microarray for studying glycolipid-protein interactions. Anal Bioanal Chem 2012; 404:51-8. [PMID: 22627703 DOI: 10.1007/s00216-012-6096-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Revised: 04/24/2012] [Accepted: 05/02/2012] [Indexed: 01/13/2023]
Abstract
A microarray enables high-throughput interaction screening of numerous biomolecules; however, fabrication of a microarray composed of cellular membrane components has proven difficult. We report fabrication of a liposomal glyco-microarray by using an azide-reactive liposome that carries synthetic and natural glycolipids via chemically selective and biocompatible liposome immobilization chemistry. Briefly, liposomes carrying anchor lipid dipalmitoylphosphatidylethanolamine (DPPE)-PEG(2000)-triphenylphosphine and ganglioside (GM1 or GM3) were prepared first and were then printed onto an azide-modified glass slide so as to afford a liposomal glyco-microarray via Staudinger ligation. Fluorescent dye release kinetics and fluorescence imaging confirmed successful liposome immobilization and specific protein binding to the intact arrayed glycoliposomes. The liposomal glyco-microarray with different gangliosides showed their specific lectin and toxin binding with different binding affinity. The azide-reactive liposome provides a facile strategy for fabrication of either a natural or a synthetic glycolipid-based membrane-mimetic glycoarray. This liposomal glyco-microarray is simple and broadly applicable and thus will find important biomedical applications, such as studying glycolipid-protein interactions and toxin screening applications.
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46
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Bessonov A, Takemoto JY, Simmel FC. Probing DNA-lipid membrane interactions with a lipopeptide nanopore. ACS NANO 2012; 6:3356-3363. [PMID: 22424398 DOI: 10.1021/nn3003696] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Association of DNA molecules with lipid bilayer membranes is of considerable interest for a large variety of applications in biotechnology. Here we introduce syringomycin E (SRE), a small pore-forming lipopeptide produced by the bacterium Pseudomonas syringae, as a facile sensor for the detection of DNA interactions with lipid membranes. SRE forms highly reproducible pores in cellular and artificial membranes. The pore structure involves bilayer lipids, which have a pronounced influence on open channel conductance and gating. SRE channels act as ionic diodes that serve as current rectifiers sensitive to the charge of the bilayer. We employ this intrinsic property to electronically monitor the association of DNA molecules with the membrane in a variety of different settings. We show that SRE can be used for quantitatively probing electrostatic interactions of DNA and DNA-cholesterol conjugates with a lipid membrane. Furthermore, we demonstrate that SRE channels allow monitoring of hybridization reactions between lipid-anchored probe strands and complementary strands in solution. In the presence of double-stranded DNA, SRE channels display a particularly high degree of rectification. Finally, the formation of multilayered structures assembled from poly-(L)-lysine and DNA oligonucleotides on the membrane was precisely monitored with SRE.
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Affiliation(s)
- Andrey Bessonov
- Physics Department E14 and ZNN/WSI, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany.
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47
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Elizondo E, Larsen J, Hatzakis NS, Cabrera I, Bjørnholm T, Veciana J, Stamou D, Ventosa N. Influence of the Preparation Route on the Supramolecular Organization of Lipids in a Vesicular System. J Am Chem Soc 2012; 134:1918-21. [DOI: 10.1021/ja2086678] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Elisa Elizondo
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Jannik Larsen
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Nikos S. Hatzakis
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Ingrid Cabrera
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Thomas Bjørnholm
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Jaume Veciana
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Dimitrios Stamou
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Nora Ventosa
- Department
of Molecular Nanoscience and Organic Materials (ICMAB-CSIC) and ‡CIBER de Bioingeniería,
Biomateriales y Nanomedicina (CIBER-BBN), Bellaterra,
08193, Spain
- Bio-Nanotechnology
Laboratory, Department of Neuroscience and Pharmacology, ∞Nano-Science Center, ⊥Lundbeck Foundation
Center Biomembranes in Nanomedicine, and #Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
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48
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Kuhn P, Eyer K, Robinson T, Schmidt FI, Mercer J, Dittrich PS. A facile protocol for the immobilisation of vesicles, virus particles, bacteria, and yeast cells. Integr Biol (Camb) 2012; 4:1550-5. [DOI: 10.1039/c2ib20181j] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Teh SY, Khnouf R, Fan H, Lee AP. Stable, biocompatible lipid vesicle generation by solvent extraction-based droplet microfluidics. BIOMICROFLUIDICS 2011; 5:44113-4411312. [PMID: 22685501 PMCID: PMC3368830 DOI: 10.1063/1.3665221] [Citation(s) in RCA: 100] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 11/11/2011] [Indexed: 05/04/2023]
Abstract
In this paper, we present a microfluidic platform for the continuous generation of stable, monodisperse lipid vesicles 20-110 μm in diameter. Our approach utilizes a microfluidic flow-focusing droplet generation design to control the vesicle size by altering the system's fluid flow rates to generate vesicles with narrow size distribution. Double emulsions are first produced in consecutive flow-focusing channel geometries and lipid membranes are then formed through a controlled solvent extraction process. Since no strong solvents are used in the process, our method allows for the safe encapsulation and manipulation of an assortment of biological entities, including cells, proteins, and nucleic acids. The vesicles generated by this method are stable and have a shelf life of at least 3 months. Here, we demonstrate the cell-free in vitro synthesis of proteins within lipid vesicles as an initial step towards the development of an artificial cell.
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50
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Dimova R. Membrane Electroporation in High Electric Fields. ADVANCES IN ELECTROCHEMICAL SCIENCES AND ENGINEERING 2011. [DOI: 10.1002/9783527644117.ch7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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