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Peng Z, Iwabuchi S, Izumi K, Takiguchi S, Yamaji M, Fujita S, Suzuki H, Kambara F, Fukasawa G, Cooney A, Di Michele L, Elani Y, Matsuura T, Kawano R. Lipid vesicle-based molecular robots. LAB ON A CHIP 2024; 24:996-1029. [PMID: 38239102 PMCID: PMC10898420 DOI: 10.1039/d3lc00860f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
A molecular robot, which is a system comprised of one or more molecular machines and computers, can execute sophisticated tasks in many fields that span from nanomedicine to green nanotechnology. The core parts of molecular robots are fairly consistent from system to system and always include (i) a body to encapsulate molecular machines, (ii) sensors to capture signals, (iii) computers to make decisions, and (iv) actuators to perform tasks. This review aims to provide an overview of approaches and considerations to develop molecular robots. We first introduce the basic technologies required for constructing the core parts of molecular robots, describe the recent progress towards achieving higher functionality, and subsequently discuss the current challenges and outlook. We also highlight the applications of molecular robots in sensing biomarkers, signal communications with living cells, and conversion of energy. Although molecular robots are still in their infancy, they will unquestionably initiate massive change in biomedical and environmental technology in the not too distant future.
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Affiliation(s)
- Zugui Peng
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Shoji Iwabuchi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Kayano Izumi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Sotaro Takiguchi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Misa Yamaji
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Shoko Fujita
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Harune Suzuki
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Fumika Kambara
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
| | - Genki Fukasawa
- School of Life Science and Technology, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-Ku, Tokyo 152-8550, Japan
| | - Aileen Cooney
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Lorenzo Di Michele
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, UK
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
- FabriCELL, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Yuval Elani
- Department of Chemical Engineering, Imperial College London, South Kensington, London SW7 2AZ, UK
- FabriCELL, Molecular Sciences Research Hub, Imperial College London, London W12 0BZ, UK
| | - Tomoaki Matsuura
- Earth-Life Science Institute, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro-Ku, Tokyo 152-8550, Japan
| | - Ryuji Kawano
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei-shi, Tokyo185-8588, Japan.
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2
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Mardešić I, Boban Z, Subczynski WK, Raguz M. Membrane Models and Experiments Suitable for Studies of the Cholesterol Bilayer Domains. MEMBRANES 2023; 13:320. [PMID: 36984707 PMCID: PMC10057498 DOI: 10.3390/membranes13030320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/06/2023] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
Cholesterol (Chol) is an essential component of animal cell membranes and is most abundant in plasma membranes (PMs) where its concentration typically ranges from 10 to 30 mol%. However, in red blood cells and Schwann cells, PMs Chol content is as high as 50 mol%, and in the PMs of the eye lens fiber cells, it can reach up to 66 mol%. Being amphiphilic, Chol molecules are easily incorporated into the lipid bilayer where they affect the membrane lateral organization and transmembrane physical properties. In the aqueous phase, Chol cannot form free bilayers by itself. However, pure Chol bilayer domains (CBDs) can form in lipid bilayer membranes with the Chol content exceeding 50 mol%. The range of Chol concentrations surpassing 50 mol% is less frequent in biological membranes and is consequently less investigated. Nevertheless, it is significant for the normal functioning of the eye lens and understanding how Chol plaques form in atherosclerosis. The most commonly used membrane models are unilamellar and multilamellar vesicles (MLVs) and supported lipid bilayers (SLBs). CBDs have been observed directly using confocal microscopy, X-ray reflectometry and saturation recovery electron paramagnetic resonance (SR EPR). Indirect evidence of CBDs has also been reported by using atomic force microscopy (AFM) and fluorescence recovery after photobleaching (FRAP) experiments. The overall goal of this review is to demonstrate the advantages and limitations of the various membrane models and experimental techniques suitable for the detection and investigation of the lateral organization, function and physical properties of CBDs.
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Affiliation(s)
- Ivan Mardešić
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (I.M.); (Z.B.)
- Faculty of Science, University of Split, Doctoral Study of Biophysics, 21000 Split, Croatia
| | - Zvonimir Boban
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (I.M.); (Z.B.)
- Faculty of Science, University of Split, Doctoral Study of Biophysics, 21000 Split, Croatia
| | | | - Marija Raguz
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (I.M.); (Z.B.)
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3
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Formation of supramolecular channels by reversible unwinding-rewinding of bis(indole) double helix via ion coordination. Nat Commun 2022; 13:6507. [PMID: 36316309 PMCID: PMC9622825 DOI: 10.1038/s41467-022-34159-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Accepted: 10/14/2022] [Indexed: 12/03/2022] Open
Abstract
Stimulus-responsive reversible transformation between two structural conformers is an essential process in many biological systems. An example of such a process is the conversion of amyloid-β peptide into β-sheet-rich oligomers, which leads to the accumulation of insoluble amyloid in the brain, in Alzheimer's disease. To reverse this unique structural shift and prevent amyloid accumulation, β-sheet breakers are used. Herein, we report a series of bis(indole)-based biofunctional molecules, which form a stable double helix structure in the solid and solution state. In presence of chloride anion, the double helical structure unwinds to form an anion-coordinated supramolecular polymeric channel, which in turn rewinds upon the addition of Ag+ salts. Moreover, the formation of the anion-induced supramolecular ion channel results in efficient ion transport across lipid bilayer membranes with excellent chloride selectivity. This work demonstrates anion-cation-assisted stimulus-responsive unwinding and rewinding of artificial double-helix systems, paving way for smart materials with better biomedical applications.
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4
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Fletcher M, Zhu J, Rubio-Sánchez R, Sandler SE, Nahas KA, Michele LD, Keyser UF, Tivony R. DNA-Based Optical Quantification of Ion Transport across Giant Vesicles. ACS NANO 2022; 16:17128-17138. [PMID: 36222833 PMCID: PMC9620405 DOI: 10.1021/acsnano.2c07496] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
Accurate measurements of ion permeability through cellular membranes remains challenging due to the lack of suitable ion-selective probes. Here we use giant unilamellar vesicles (GUVs) as membrane models for the direct visualization of mass translocation at the single-vesicle level. Ion transport is indicated with a fluorescently adjustable DNA-based sensor that accurately detects sub-millimolar variations in K+ concentration. In combination with microfluidics, we employed our DNA-based K+ sensor for extraction of the permeation coefficient of potassium ions. We measured K+ permeability coefficients at least 1 order of magnitude larger than previously reported values from bulk experiments and show that permeation rates across the lipid bilayer increase in the presence of octanol. In addition, an analysis of the K+ flux in different concentration gradients allows us to estimate the complementary H+ flux that dissipates the charge imbalance across the GUV membrane. Subsequently, we show that our sensor can quantify the K+ transport across prototypical cation-selective ion channels, gramicidin A and OmpF, revealing their relative H+/K+ selectivity. Our results show that gramicidin A is much more selective to protons than OmpF with a H+/K+ permeability ratio of ∼104.
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Affiliation(s)
- Marcus Fletcher
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
| | - Jinbo Zhu
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
| | - Roger Rubio-Sánchez
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, LondonW12 0BZ, U.K.
- fabriCELL,
Molecular Sciences Research Hub, Imperial
College London, LondonW12 0BZ, U.K.
| | - Sarah E Sandler
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
| | - Kareem Al Nahas
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
| | - Lorenzo Di Michele
- Department
of Chemistry, Molecular Sciences Research Hub, Imperial College London, LondonW12 0BZ, U.K.
- fabriCELL,
Molecular Sciences Research Hub, Imperial
College London, LondonW12 0BZ, U.K.
| | - Ulrich F Keyser
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
| | - Ran Tivony
- Cavendish
Laboratory, University of Cambridge, J.J. Thomson Avenue, CambridgeCB3 0HE, U.K.
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5
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Górecki K, Hansen JS, Li P, Nayeri N, Lindkvist-Petersson K, Gourdon P. Microfluidic-Derived Detection of Protein-Facilitated Copper Flux Across Lipid Membranes. Anal Chem 2022; 94:11831-11837. [PMID: 35969432 PMCID: PMC9434548 DOI: 10.1021/acs.analchem.2c02081] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
![]()
Measurement of protein-facilitated copper flux across
biological
membranes is a considerable challenge. Here, we demonstrate a straightforward
microfluidic-derived approach for visualization and measurement of
membranous Cu flux. Giant unilamellar vesicles, reconstituted with
the membrane protein of interest, are prepared, surface-immobilized,
and assessed using a novel quencher–sensor reporter system
for detection of copper. With the aid of a syringe pump, the external
buffer is exchanged, enabling consistent and precise exchange of solutes,
without causing vesicle rupture or uneven local metal concentrations
brought about by rapid mixing. This approach bypasses common issues
encountered when studying heavy metal-ion flux, thereby providing
a new platform for in vitro studies of metal homeostasis
aspects that are critical for all cells, health, and disease.
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Affiliation(s)
- Kamil Górecki
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden
| | - Jesper S Hansen
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden
| | - Ping Li
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden
| | - Niloofar Nayeri
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden
| | - Karin Lindkvist-Petersson
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden
| | - Pontus Gourdon
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund SE-22100, Sweden.,Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen N DK-2200, Denmark
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6
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Boban Z, Mardešić I, Subczynski WK, Raguz M. Giant Unilamellar Vesicle Electroformation: What to Use, What to Avoid, and How to Quantify the Results. MEMBRANES 2021; 11:membranes11110860. [PMID: 34832088 PMCID: PMC8622294 DOI: 10.3390/membranes11110860] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/03/2021] [Accepted: 11/05/2021] [Indexed: 12/12/2022]
Abstract
Since its inception more than thirty years ago, electroformation has become the most commonly used method for growing giant unilamellar vesicles (GUVs). Although the method seems quite straightforward at first, researchers must consider the interplay of a large number of parameters, different lipid compositions, and internal solutions in order to avoid artifactual results or reproducibility problems. These issues motivated us to write a short review of the most recent methodological developments and possible pitfalls. Additionally, since traditional manual analysis can lead to biased results, we have included a discussion on methods for automatic analysis of GUVs. Finally, we discuss possible improvements in the preparation of GUVs containing high cholesterol contents in order to avoid the formation of artifactual cholesterol crystals. We intend this review to be a reference for those trying to decide what parameters to use as well as an overview providing insight into problems not yet addressed or solved.
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Affiliation(s)
- Zvonimir Boban
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (Z.B.); (I.M.)
- Doctoral Study of Biophysics, Faculty of Science, University of Split, 21000 Split, Croatia
| | - Ivan Mardešić
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (Z.B.); (I.M.)
- Doctoral Study of Biophysics, Faculty of Science, University of Split, 21000 Split, Croatia
| | | | - Marija Raguz
- Department of Medical Physics and Biophysics, University of Split School of Medicine, 21000 Split, Croatia; (Z.B.); (I.M.)
- Correspondence: ; Tel.: +385-98-768-819
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7
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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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8
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Shen Y, Zhong Y, Fei F, Sun J, Czajkowsky DM, Gong B, Shao Z. Ultrasensitive liposome-based assay for the quantification of fundamental ion channel properties. Anal Chim Acta 2020; 1112:8-15. [PMID: 32334685 DOI: 10.1016/j.aca.2020.03.044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 02/16/2020] [Accepted: 03/22/2020] [Indexed: 10/24/2022]
Abstract
One of the most widely used approaches to characterize transmembrane ion transport through nanoscale synthetic or biological channels is a straightforward, liposome-based assay that monitors changes in ionic flux across the vesicle membrane using pH- or ion-sensitive dyes. However, failure to account for the precise experimental conditions, in particular the complete ionic composition on either side of the membrane and the inherent permeability of ions through the lipid bilayer itself, can prevent quantifications and lead to fundamentally incorrect conclusions. Here we present a quantitative model for this assay based on the Goldman-Hodgkin-Katz flux theory, which enables accurate measurements and identification of optimal conditions for the determination of ion channel permeability and selectivity. Based on our model, the detection sensitivity of channel permeability is improved by two orders of magnitude over the commonly used experimental conditions. Further, rather than obtaining qualitative preferences of ion selectivity as is typical, we determine quantitative values of these parameters under rigorously controlled conditions even when the experimental results would otherwise imply (without our model) incorrect behavior. We anticipate that this simply employed ultrasensitive assay will find wide application in the quantitative characterization of synthetic or biological ion channels.
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Affiliation(s)
- Yi Shen
- Bio-ID Center, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yulong Zhong
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, NY, 14260, United States
| | - Fan Fei
- Bio-ID Center, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Jielin Sun
- Shanghai Center for Systems Biomedicine, Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Daniel M Czajkowsky
- Bio-ID Center, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Bing Gong
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, NY, 14260, United States.
| | - Zhifeng Shao
- Bio-ID Center, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
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9
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Bąk KM, van Kolck B, Maslowska-Jarzyna K, Papadopoulou P, Kros A, Chmielewski MJ. Oxyanion transport across lipid bilayers: direct measurements in large and giant unilamellar vesicles. Chem Commun (Camb) 2020; 56:4910-4913. [PMID: 32238998 DOI: 10.1039/c9cc09888g] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A simple di(thioamido)carbazole 1 serves as a potent multispecific transporter for various biologically relevant oxyanions, such as drugs, metabolites and model organic phosphate. The transport kinetics of a wide range of oxyanions can be easily quantified by a modified lucigenin assay in both large and giant unilamellar vesicles.
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Affiliation(s)
- Krzysztof M Bąk
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland.
| | - Bartjan van Kolck
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Krystyna Maslowska-Jarzyna
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland.
| | - Panagiota Papadopoulou
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Alexander Kros
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
| | - Michał J Chmielewski
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland.
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10
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Boban Z, Puljas A, Kovač D, Subczynski WK, Raguz M. Effect of Electrical Parameters and Cholesterol Concentration on Giant Unilamellar Vesicles Electroformation. Cell Biochem Biophys 2020; 78:157-164. [PMID: 32319021 DOI: 10.1007/s12013-020-00910-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/30/2020] [Indexed: 10/23/2022]
Abstract
Giant unilamellar vesicles (GUVs) are used extensively as models that mimic cell membranes. The cholesterol (Chol) content in the fiber cell plasma membranes of the eye lens is extremely high, exceeding the solubility threshold in the lenses of old humans. Thus, a methodological paper pertaining to preparations of model lipid bilayer membranes with high Chol content would significantly help the study of properties of these membranes. Lipid solutions containing 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) and Chol were fluorescently labeled with phospholipid analog 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiIC18(3)) and spin-coated to produce thin lipid films. GUVs were formed from these films using the electroformation method and the results were obtained using fluorescent microscopy. Electroformation outcomes were examined for different electrical parameters and different Chol concentrations. A wide range of field frequency-field strength (ff-fs) combinations was explored: 10-10,000 Hz and 0.625-9.375 V/mm peak-to-peak. Optimal values for GUVs preparation were found to be 10-100 Hz and 1.25-6.25 V/mm, with largest vesicles occurring for 10 Hz and 3.75 V/mm. Chol:POPC mixing ratios (expressed as a molar ratio) ranged from 0 to 3.5. We show that increasing the Chol concentration decreases the GUVs size, but this effect can be reduced by choosing the appropriate ff-fs combination.
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Affiliation(s)
- Zvonimir Boban
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia.,University of Split, Faculty of Science, Doctoral study of Biophysics, Split, Croatia
| | - Ana Puljas
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia
| | - Dubravka Kovač
- Department of Physics, Faculty of Science, University of Split, Split, Croatia
| | | | - Marija Raguz
- Department of Medical Physics and Biophysics, University of Split School of Medicine, Split, Croatia.
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11
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Abstract
The combination of supramolecular functional systems with biomolecular chemistry has been a fruitful exercise for decades, leading to a greater understanding of biomolecules and to a great variety of applications, for example, in drug delivery and sensing. Within these developments, the phospholipid bilayer membrane, surrounding live cells, with all its functions has also intrigued supramolecular chemists. Herein, recent efforts from the supramolecular chemistry community to mimic natural functions of lipid membranes, such as sensing, molecular recognition, membrane fusion, signal transduction, and gated transport, are reviewed.
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Affiliation(s)
- Andrea Barba‐Bon
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
| | - Mohamed Nilam
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
| | - Andreas Hennig
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
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12
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Biswas O, Akhtar N, Vashi Y, Saha A, Kumar V, Pal S, Kumar S, Manna D. Chloride Ion Transport by PITENINs across the Phospholipid Bilayers of Vesicles and Cells. ACS APPLIED BIO MATERIALS 2020; 3:935-944. [DOI: 10.1021/acsabm.9b00985] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Oindrila Biswas
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Nasim Akhtar
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Yoya Vashi
- Department of Bioscience and Bioengineering, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Abhishek Saha
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Vishnu Kumar
- Department of Bioscience and Bioengineering, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Sudipa Pal
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Sachin Kumar
- Department of Bioscience and Bioengineering, Indian Institute of Technology Guwahati, Assam 781039, India
| | - Debasis Manna
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam 781039, India
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13
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Akhtar N, Saha A, Kumar V, Pradhan N, Panda S, Morla S, Kumar S, Manna D. Diphenylethylenediamine-Based Potent Anionophores: Transmembrane Chloride Ion Transport and Apoptosis Inducing Activities. ACS APPLIED MATERIALS & INTERFACES 2018; 10:33803-33813. [PMID: 30221925 DOI: 10.1021/acsami.8b06664] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Synthetic anion transporters have been recognized as one of the potential therapeutic agents for the treatment of diseases including cystic fibrosis, myotonia, and epilepsy that originate due to the malfunctioning of natural Cl- ion transport systems. Recent studies showed that the synthetic Cl- ion transporters can also disrupt cellular ion-homeostasis and induce apoptosis in cancer cell lines, leading to a revived attention for synthetic Cl- ion transporters. Herein, we report the development of conformationally controlled 1,2-diphenylethylenediamine-based bis(thiourea) derivatives as a new class of selective Cl- ion carrier. The strong Cl- ion binding properties ( Kd = 3.87-6.66 mM) of the bis(thiourea) derivatives of diamine-based compounds correlate well with their transmembrane anion transport activities (EC50 = 2.09-4.15 nM). The transport of Cl- ions via Cl-/NO3- antiport mechanism was confirmed for the most active molecule. Perturbation of Cl- ion homeostasis by this anion carrier induces cell death by promoting the caspase-mediated intrinsic pathway of apoptosis.
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14
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Morita M, Katoh K, Noda N. Direct Observation of Bacterial Growth in Giant Unilamellar Vesicles: A Novel Tool for Bacterial Cultures. ChemistryOpen 2018; 7:845-849. [PMID: 30402373 PMCID: PMC6208190 DOI: 10.1002/open.201800126] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Indexed: 12/28/2022] Open
Abstract
Bacterial cultivation techniques are classic, basic, and common processes used to characterize the physiological activity of bacteria in their environment. Owing to recent advances in bacterial cultivation techniques, the physiological activity of bacteria can be elucidated at the single-cell culture level. Here, we report a novel method to monitor the real-time activity of bacterial growth at the single-cell level inside giant unilamellar vesicles (GUVs). This method consists of two steps: 1) encapsulation of single bacteria in 1-33 pL scale GUVs and 2) immobilization of the GUVs on a planar lipid bilayer membrane on a glass surface. We directly observed single E. coli cells actively growing to a great number of cells inside GUVs. GUVs also protected the bacteria from external antibiotic compounds during prolonged cultivation for more than 24 h. This approach can be applied widely in the fields of biochemistry, biotechnology, microbiology, and synthetic biology.
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Affiliation(s)
- Masamune Morita
- Biomedical Research Institute National Institute of Advanced Industrial Science and Technology (AIST), Center 6 1-1-1 Higashi Tsukuba Ibaraki 305-8566 Japan
| | - Kaoru Katoh
- Biomedical Research Institute National Institute of Advanced Industrial Science and Technology (AIST), Center 6 1-1-1 Higashi Tsukuba Ibaraki 305-8566 Japan
| | - Naohiro Noda
- Biomedical Research Institute National Institute of Advanced Industrial Science and Technology (AIST), Center 6 1-1-1 Higashi Tsukuba Ibaraki 305-8566 Japan
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15
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Movsesian N, Tittensor M, Dianat G, Gupta M, Malmstadt N. Giant Lipid Vesicle Formation Using Vapor-Deposited Charged Porous Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9025-9035. [PMID: 29961336 DOI: 10.1021/acs.langmuir.8b00736] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In this study, we prepare giant lipid vesicles using vapor-deposited charged microporous poly(methacrylic acid- co-ethylene glycol diacrylate) polymer membranes with different morphologies and thicknesses. Our results suggest that vesicle formation is favored by thinner, more structured porous hydrogel substrates. Electrostatic interactions between the polymer and the lipid head groups affect vesicle yield and size distribution. Repulsive electrostatic interactions between the hydrogel and the lipid head groups promote vesicle formation; attractive electrostatic interactions suppress vesicle formation. Ionic strength and sugar concentration are also major parameters affecting the yield and size of giant vesicles. The presence of both ions and sugars in the hydration buffer results in increased vesicle yields. These results indicate that lipid-polymer interactions and osmotic effects in addition to the substrate morphology and surface charge are key factors affecting vesicle formation. Our data suggest that surface chemistry should be designed to tune electrostatic interactions with the lipid mixture of interest to promote vesicle formation. This vapor-deposited hydrogel fabrication technique offers tunability over the physicochemical properties of the hydrogel substrate for the production of giant vesicles with different sizes and compositions.
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16
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Jowett LA, Howe ENW, Wu X, Busschaert N, Gale PA. New Insights into the Anion Transport Selectivity and Mechanism of Tren-based Tris-(thio)ureas. Chemistry 2018; 24:10475-10487. [PMID: 29786913 DOI: 10.1002/chem.201801463] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 05/09/2018] [Indexed: 11/07/2022]
Abstract
The anion transport properties of a series of previously reported tren-based anionophores have been revisited using new assays designed to measure anion uniport. This study provides new insights into the transport mechanism and selectivity of this important class of transporters. Specifically, we report the chloride and nitrate transport selectivity of these systems and quantify sulfate transport to determine EC50 values for sulfate transport for the first time. Two new assays were developed to study bicarbonate transport allowing accurate quantification of chloride/bicarbonate exchange.
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Affiliation(s)
- Laura A Jowett
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Ethan N W Howe
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Xin Wu
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
| | | | - Philip A Gale
- School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia
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17
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Jian YK, Le XX, Zhang YC, Lu W, Wang L, Zheng J, Zhang JW, Huang YJ, Chen T. Shape Memory Hydrogels with Simultaneously Switchable Fluorescence Behavior. Macromol Rapid Commun 2018; 39:e1800130. [DOI: 10.1002/marc.201800130] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 03/15/2018] [Indexed: 12/29/2022]
Affiliation(s)
- Yu-kun Jian
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Xiao-xia Le
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Yu-chong Zhang
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Wei Lu
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Li Wang
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Jing Zheng
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Jia-wei Zhang
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - You-ju Huang
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies; Zhejiang Key Laboratory of Marine Materials and Protective Technologies; Ningbo Institute of Material Technology and Engineering; Chinese Academy of Sciences; Ningbo 315201 China
- School of Chemical Sciences; University of Chinese Academy of Sciences; 19 A Yuquan Rd Shijingshan District Beijing 100049 China
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18
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Binfield JG, Brendel JC, Cameron NR, Eissa AM, Perrier S. Imaging Proton Transport in Giant Vesicles through Cyclic Peptide-Polymer Conjugate Nanotube Transmembrane Ion Channels. Macromol Rapid Commun 2018; 39:e1700831. [DOI: 10.1002/marc.201700831] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Revised: 01/20/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Jason G. Binfield
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
| | | | - Neil R. Cameron
- School of Engineering; The University of Warwick; Coventry CV4 7AL UK
- Department of Materials Science and Engineering; Monash University; 22 Alliance Lane Clayton 3800 Victoria Australia
| | - Ahmed M. Eissa
- School of Engineering; The University of Warwick; Coventry CV4 7AL UK
- Department of Materials Science and Engineering; Monash University; 22 Alliance Lane Clayton 3800 Victoria Australia
- Department of Polymers; Chemical Industries Research Division; National Research Centre (NRC); 33 El-Bohouth Street Dokki, Giza 12622 Cairo Egypt
| | - Sébastien Perrier
- Department of Chemistry; The University of Warwick; Coventry CV4 7AL UK
- Warwick Medical School; The University of Warwick; Coventry CV4 7AL UK
- Faculty of Pharmacy and Pharmaceutical Sciences; Monash University; Parkville 3052 Victoria Australia
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19
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Mora NL, Gao Y, Gutierrez MG, Peruzzi J, Bakker I, Peters RJRW, Siewert B, Bonnet S, Kieltyka RE, van Hest JCM, Malmstadt N, Kros A. Evaluation of dextran(ethylene glycol) hydrogel films for giant unilamellar lipid vesicle production and their application for the encapsulation of polymersomes. SOFT MATTER 2017; 13:5580-5588. [PMID: 28730206 PMCID: PMC5586486 DOI: 10.1039/c7sm00551b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Giant Unilamellar Vesicles (GUVs) prepared from phospholipids are becoming popular membrane model systems for use in biophysical studies. The quality, size and yield of GUVs depend on the preparation method used to obtain them. In this study, hydrogels consisting of dextran polymers crosslinked by poly(ethylene glycol) (DexPEG) were used as hydrophilic frameworks for the preparation of vesicle suspensions under physiological ionic strength conditions. A comparative study was conducted using hydrogels with varied physicochemical properties to evaluate their performance for GUV production. The prepared GUVs were quantified by flow cytometry using the Coulter Principle to determine the yield and size distribution. We find that hydrogels of lower mechanical strength, increased swellability and decreased lipid interaction favour GUV production, while their resulting size is determined by the surface roughness of the hydrogel film. Moreover, we embedded polymersomes into the crosslinked hydrogel network, creating a DexPEG - polymersome hybrid film. The re-hydration of lipids on those hybrid substrates led to the production of GUVs and the efficient encapsulation of polymersomes in the lumen of GUVs.
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Affiliation(s)
- Nestor Lopez Mora
- Leiden Institute of Chemistry, Leiden University, Supramolecular & Biomaterials Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
| | - Yue Gao
- Leiden Institute of Chemistry, Leiden University, Supramolecular & Biomaterials Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
| | - M Gertrude Gutierrez
- Departments of Chemical Engineering & Materials Science, Biomedical Engineering, and Chemistry, University of Southern California, 925 Bloom Walk, 90089, Los Angeles, CA, USA
| | - Justin Peruzzi
- Department of Chemical Engineering, University of Virginia, 102 Engineer's Way, 400741, Charlottesville, VA, USA
| | - Ivan Bakker
- Leiden Institute of Chemistry, Leiden University, Supramolecular & Biomaterials Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
| | - Ruud J R W Peters
- Radboud University Nijmegen, Department of Organic Chemistry, Heyendaalseweg 135 6525 AJ, Nijmegen, The Netherlands
| | - Bianka Siewert
- Leiden Institute of Chemistry, Leiden University, Metals in Catalysis, Biomimetics & Inorganic Materials, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Sylvestre Bonnet
- Leiden Institute of Chemistry, Leiden University, Metals in Catalysis, Biomimetics & Inorganic Materials, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Roxanne E Kieltyka
- Leiden Institute of Chemistry, Leiden University, Supramolecular & Biomaterials Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
| | - Jan C M van Hest
- Radboud University Nijmegen, Department of Organic Chemistry, Heyendaalseweg 135 6525 AJ, Nijmegen, The Netherlands
| | - Noah Malmstadt
- Departments of Chemical Engineering & Materials Science, Biomedical Engineering, and Chemistry, University of Southern California, 925 Bloom Walk, 90089, Los Angeles, CA, USA
| | - Alexander Kros
- Leiden Institute of Chemistry, Leiden University, Supramolecular & Biomaterials Chemistry, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.
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20
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Valkenier H, Dias CM, Butts CP, Davis AP. A folding decalin tetra-urea for transmembrane anion transport. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.04.064] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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21
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Gale PA, Davis JT, Quesada R. Anion transport and supramolecular medicinal chemistry. Chem Soc Rev 2017; 46:2497-2519. [DOI: 10.1039/c7cs00159b] [Citation(s) in RCA: 219] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
New approaches to the transmembrane transport of anions are discussed in this review.
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Affiliation(s)
- Philip A. Gale
- School of Chemistry (F11)
- The University of Sydney
- Australia
| | - Jeffery T. Davis
- Department of Chemistry and Biochemistry
- University of Maryland
- College Park
- USA
| | - Roberto Quesada
- Departmento de Química
- Universidad de Burgos
- 09001 Burgos
- Spain
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22
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Yang Y, Wu X, Busschaert N, Furuta H, Gale PA. Dissecting the chloride–nitrate anion transport assay. Chem Commun (Camb) 2017; 53:9230-9233. [DOI: 10.1039/c7cc04912a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The chloride/nitrate selectivity of anion transporters in both binding and membrane transport is examined revealing the limitations of chloride–nitrate anion exchange assay.
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Affiliation(s)
- Yufeng Yang
- Chemistry
- University of Southampton
- Southampton
- UK
- Department of Chemistry and Biochemistry
| | - Xin Wu
- School of Chemistry
- The University of Sydney
- Australia
| | | | - Hiroyuki Furuta
- Department of Chemistry and Biochemistry
- Kyushu University
- Fukuoka
- Japan
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23
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24
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Sharifian Gh M, Wilhelm MJ, Dai HL. Label-Free Optical Method for Quantifying Molecular Transport Across Cellular Membranes In Vitro. J Phys Chem Lett 2016; 7:3406-3411. [PMID: 27518496 DOI: 10.1021/acs.jpclett.6b01483] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate a nonlinear optical method for the label-free quantification of membrane transport rates of small/medium size molecules in living cells. Specifically, second-harmonic generation (SHG) laser scattering permits surface-specific characterization of transport across membranes. Unfortunately, most biologically relevant molecules are SHG-inactive. In the interest of extending this methodology for characterizing transport of any molecule, we monitor the SHG produced from an SHG-active reference molecule, in the presence of an SHG-inactive target molecule-of-interest as both molecules compete to cross a membrane. Of significance, the SHG-inactive target transport rate can be deduced as a perturbation in the measured transport rate of the reference. As proof-of-principle, we examine competitive transport of the strongly SHG-active cation, malachite green (MG), in the presence of a weakly SHG-active dication, propidium (Pro), across the outer-membrane protein channels in living bacteria. Comparison of the extracted and directly measured Pro transport rates validates the effectiveness of the method.
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Affiliation(s)
- Mohammad Sharifian Gh
- Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Michael J Wilhelm
- Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Hai-Lung Dai
- Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
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25
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Mora NL, Bahreman A, Valkenier H, Li H, Sharp TH, Sheppard DN, Davis AP, Kros A. Targeted anion transporter delivery by coiled-coil driven membrane fusion. Chem Sci 2016; 7:1768-1772. [PMID: 28936326 PMCID: PMC5592372 DOI: 10.1039/c5sc04282h] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 01/06/2016] [Indexed: 01/11/2023] Open
Abstract
Synthetic anion transporters (anionophores) have potential as biomedical research tools and therapeutics. However, the efficient and specific delivery of these highly lipophilic molecules to a target cell membrane is non-trivial. Here, we investigate the delivery of a powerful anionophore to artificial and cell membranes using a coiled-coil-based delivery system inspired by SNARE membrane fusion proteins. Incorporation of complementary lipopeptides into the lipid membranes of liposomes and cell-sized giant unilamellar vesicles (GUVs) facilitated the delivery of a powerful anionophore into GUVs, where its anion transport activity was monitored in real time by fluorescence microscopy. Similar results were achieved using live cells engineered to express a halide-sensitive fluorophore. We conclude that coiled-coil driven membrane fusion is a highly efficient system to deliver anionophores to target cell membranes.
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Affiliation(s)
- Nestor Lopez Mora
- Leiden Institute of Chemistry , Leiden University , 2300 RA Leiden , The Netherlands .
| | - Azadeh Bahreman
- Leiden Institute of Chemistry , Leiden University , 2300 RA Leiden , The Netherlands .
| | - Hennie Valkenier
- School of Chemistry , University of Bristol Cantock's Close , Bristol BS8 1TS , UK .
| | - Hongyu Li
- School of Physiology, Pharmacology and Neuroscience , University of Bristol Biomedical Sciences Building , University Walk , Bristol BS8 1TD , UK
| | - Thomas H Sharp
- Department of Molecular Cell Biology , Section Electron Microscopy , Leiden University Medical Center , 2300 RC Leiden , The Netherlands
| | - David N Sheppard
- School of Physiology, Pharmacology and Neuroscience , University of Bristol Biomedical Sciences Building , University Walk , Bristol BS8 1TD , UK
| | - Anthony P Davis
- School of Chemistry , University of Bristol Cantock's Close , Bristol BS8 1TS , UK .
| | - Alexander Kros
- Leiden Institute of Chemistry , Leiden University , 2300 RA Leiden , The Netherlands .
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26
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Schibilla F, Stegemann L, Strassert CA, Rizzo F, Ravoo BJ. Fluorescence quenching in β-cyclodextrin vesicles: membrane confinement and host-guest interactions. Photochem Photobiol Sci 2016; 15:235-43. [PMID: 26777315 DOI: 10.1039/c5pp00226e] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fluorescent β-cyclodextrin vesicles (β-CDV) that display host cavities available for host-guest interactions at the vesicle surface were prepared by incorporation of the hydrophobic spirobifluorene-based dye 1 into the membrane of unilamellar vesicles. Fluorescence quenching of dye 1 was observed in the presence of different quenchers. Methyl viologen 2 does not quench dye 1 because it does not bind to β-CDV. 4-Nitrophenol 3 and 4-nitrophenol covalently connected to adamantane 4 quench the fluorescence of dye 1 in neutral solution, but by different mechanisms according to lifetime measurements. The quenching efficiency of 3 is pH dependent due to the presence of the phenolate form. Competition experiments with excess host and guest showed that 3 is likely to diffuse in and out of the membrane, while 4 forms an inclusion complex with β-CDV leading to close contact and efficient quenching. Our findings confirm that this dynamic supramolecular system is a versatile model to investigate quenching and recognition processes in bilayer membranes.
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Affiliation(s)
- Frauke Schibilla
- Organic Chemistry Institute and CeNTech, Westfälische Wilhelms-Universität Münster, Corrensstr. 40, D-48149 Münster, Germany.
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27
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Hein R, Uzundal CB, Hennig A. Simple and rapid quantification of phospholipids for supramolecular membrane transport assays. Org Biomol Chem 2016; 14:2182-5. [DOI: 10.1039/c5ob02480c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We introduce a simple 1H NMR method for quantification of the phospholipid content of liposomes.
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Affiliation(s)
- Robert Hein
- Department of Life Sciences and Chemistry
- Jacobs University Bremen
- 28759 Bremen
- Germany
| | - Can B. Uzundal
- Department of Life Sciences and Chemistry
- Jacobs University Bremen
- 28759 Bremen
- Germany
| | - Andreas Hennig
- Department of Life Sciences and Chemistry
- Jacobs University Bremen
- 28759 Bremen
- Germany
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28
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Askes SHC, Mora NL, Harkes R, Koning RI, Koster B, Schmidt T, Kros A, Bonnet S. Imaging the lipid bilayer of giant unilamellar vesicles using red-to-blue light upconversion. Chem Commun (Camb) 2015; 51:9137-40. [DOI: 10.1039/c5cc02197a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Red-to-blue triplet–triplet annihilation upconversion was obtained in giant unilamellar vesicles.
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Affiliation(s)
- Sven H. C. Askes
- Leiden Institute of Chemistry
- Leiden University
- 2333 CC Leiden
- The Netherlands
| | - Néstor López Mora
- Leiden Institute of Chemistry
- Leiden University
- 2333 CC Leiden
- The Netherlands
| | - Rolf Harkes
- Leiden Institute of Physics
- Leiden University
- 2333 CA Leiden
- The Netherlands
| | - Roman I. Koning
- Leiden University Medical Center
- 2333 ZC Leiden
- The Netherlands
| | - Bram Koster
- Leiden University Medical Center
- 2333 ZC Leiden
- The Netherlands
| | - Thomas Schmidt
- Leiden Institute of Physics
- Leiden University
- 2333 CA Leiden
- The Netherlands
| | - Alexander Kros
- Leiden Institute of Chemistry
- Leiden University
- 2333 CC Leiden
- The Netherlands
| | - Sylvestre Bonnet
- Leiden Institute of Chemistry
- Leiden University
- 2333 CC Leiden
- The Netherlands
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29
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Park EB, Jeong KS. Chloride transport activities of trans- and cis-amide-linked bisureas. Chem Commun (Camb) 2015; 51:9197-200. [DOI: 10.1039/c5cc02757h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A stimuli-responsive synthetic chloride transporter has been devised based on the different transport abilities of bisurea compounds linked by cis- and trans-amides.
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Affiliation(s)
- Eun Bit Park
- Department of Chemistry
- Yonsei University
- Seoul
- Korea
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