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Alghalayini A, Jiang L, Gu X, Yeoh GH, Cranfield CG, Timchenko V, Cornell BA, Valenzuela SM. Real-time monitoring of heat transfer between gold nanoparticles and tethered bilayer lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183334. [PMID: 32380171 DOI: 10.1016/j.bbamem.2020.183334] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 04/25/2020] [Accepted: 04/28/2020] [Indexed: 12/31/2022]
Abstract
Plasmon resonance frequency irradiated gold nanoparticles (GNPs) have gained interest as a laser-targeted treatment for infections, tumors and for the controlled release of drugs in situ. Questions still remain, however, as to the efficiency of heat delivery within biological tissues and how this can be reliably determined. Here, we demonstrate how a nanomaterial-electrode interface that mimics cell membranes can detect the localized heat transfer characteristics arising from plasmon resonance frequency-matched laser excitation of GNPs. We demonstrate that the lipid bilayer membrane can be affected by conjugated GNP induced hyperthermia when irradiated with a laser power output as low as 135 nW/μm2. This is four orders of magnitude lower power than previously reported. By restricting the lateral movement of the lipids in the bilayer membrane, it was shown that the change in membrane conductance as a result of the heat transfer was due to the creation of transient lipidic toroidal pores within the membrane. We further demonstrate that the heat transfer from the GNPs alters diffusion rates of monomers of the gramicidin-A peptide within the lipid leaflets. This work highlights how targeted low laser power GNP hyperthermia treatments, in vivo, could play a dual role of interfering with both cell membrane morphology and dynamics, along with membrane protein function.
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Affiliation(s)
- Amani Alghalayini
- School of Life Sciences, University of Technology Sydney, Sydney, New South Wales 2007, Australia; ARC Research Hub for Integrated Devices for End-user Analysis at Low-levels (IDEAL), Faculty of Science, University of Technology Sydney, NSW 2007, Australia
| | - Lele Jiang
- School of Life Sciences, University of Technology Sydney, Sydney, New South Wales 2007, Australia
| | - Xi Gu
- School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Guan Heng Yeoh
- School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Charles G Cranfield
- School of Life Sciences, University of Technology Sydney, Sydney, New South Wales 2007, Australia; ARC Research Hub for Integrated Devices for End-user Analysis at Low-levels (IDEAL), Faculty of Science, University of Technology Sydney, NSW 2007, Australia
| | - Victoria Timchenko
- School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Bruce A Cornell
- Surgical Diagnostics Pty Ltd., Roseville, Sydney 2069, Australia; ARC Research Hub for Integrated Devices for End-user Analysis at Low-levels (IDEAL), Faculty of Science, University of Technology Sydney, NSW 2007, Australia
| | - Stella M Valenzuela
- School of Life Sciences, University of Technology Sydney, Sydney, New South Wales 2007, Australia; Institute for Biomedical Materials and Devices, University of Technology Sydney, Sydney, New South Wales 2007, Australia; ARC Research Hub for Integrated Devices for End-user Analysis at Low-levels (IDEAL), Faculty of Science, University of Technology Sydney, NSW 2007, Australia.
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52
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Electrochemical Biosensors Based on Membrane-Bound Enzymes in Biomimetic Configurations. SENSORS 2020; 20:s20123393. [PMID: 32560121 PMCID: PMC7349357 DOI: 10.3390/s20123393] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 06/12/2020] [Accepted: 06/14/2020] [Indexed: 02/07/2023]
Abstract
In nature, many enzymes are attached or inserted into the cell membrane, having hydrophobic subunits or lipid chains for this purpose. Their reconstitution on electrodes maintaining their natural structural characteristics allows for optimizing their electrocatalytic properties and stability. Different biomimetic strategies have been developed for modifying electrodes surfaces to accommodate membrane-bound enzymes, including the formation of self-assembled monolayers of hydrophobic compounds, lipid bilayers, or liposomes deposition. An overview of the different strategies used for the formation of biomimetic membranes, the reconstitution of membrane enzymes on electrodes, and their applications as biosensors is presented.
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Sabirovas T, Valiūnienė A, Gabriunaite I, Valincius G. Mixed hybrid bilayer lipid membranes on mechanically polished titanium surface. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183232. [PMID: 32119863 DOI: 10.1016/j.bbamem.2020.183232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 02/07/2020] [Accepted: 02/20/2020] [Indexed: 02/04/2023]
Abstract
Mixed self-assembled monolayers of octadecyltrichlorosilane (OTS) and methyltrichlorosilane (MTS) were deposited via simple silanization procedure on a mechanically polished titanium surface. The monolayers act as molecular anchors for mixed hybrid bilayer lipid membranes (mhBLM) which were accomplished via vesicle fusion. A variation of the MTS concentration in silanization solutions significantly affects properties of mhBLMs composed of a 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and cholesterol (Chol). The bilayers become less insulating following an increase of the MTS content. On the other hand, an increase of the MTS concentration provides flexibility of the mhBLM membranes necessary for the functional reconstitution of membrane proteins. The optimal molar ratio of MTS in silanization solution is 40% providing anchors for intact mhBLMs as confirmed by their specific capacitance of 0.86 μF cm-2. We found that the bilayers containing 40% (mol) of cholesterol bind cholesterol dependent pneumolysin (PLY). However, we did not observe functional reconstitution of PLY. While α-hemolysin almost fully disrupts mhBLMs assembled from 100% diphytanoyl. An important advantage of the titanium/OTS/MTS molecular anchor systems is their ability of repetitive regeneration of phospholipid bilayers without losing functional properties as demonstrated in the current study. This creates a possibility for the multiple-use phospholipid membrane biosensors which have a potential of decreasing the cost of such electrochemical/electroanalytical devices.
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Affiliation(s)
- Tomas Sabirovas
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius LT-03225, Lithuania
| | - Aušra Valiūnienė
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius LT-03225, Lithuania
| | - Inga Gabriunaite
- Department of Physical Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius LT-03225, Lithuania
| | - Gintaras Valincius
- Vilnius University, Institute of Biochemistry, Life Sciences Center, Sauletekio ave. 7, Vilnius LT-10257, Lithuania.
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54
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Seimei A, Saeki D, Matsuyama H. Effect of polyelectrolyte structure on formation of supported lipid bilayers on polyelectrolyte multilayers prepared using the layer-by-layer method. J Colloid Interface Sci 2020; 569:211-218. [DOI: 10.1016/j.jcis.2020.02.079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 01/20/2020] [Accepted: 02/19/2020] [Indexed: 11/17/2022]
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55
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Jakšić Z, Jakšić O. Biomimetic Nanomembranes: An Overview. Biomimetics (Basel) 2020; 5:E24. [PMID: 32485897 PMCID: PMC7345464 DOI: 10.3390/biomimetics5020024] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 05/26/2020] [Accepted: 05/27/2020] [Indexed: 11/30/2022] Open
Abstract
Nanomembranes are the principal building block of basically all living organisms, and without them life as we know it would not be possible. Yet in spite of their ubiquity, for a long time their artificial counterparts have mostly been overlooked in mainstream microsystem and nanosystem technologies, being a niche topic at best, instead of holding their rightful position as one of the basic structures in such systems. Synthetic biomimetic nanomembranes are essential in a vast number of seemingly disparate fields, including separation science and technology, sensing technology, environmental protection, renewable energy, process industry, life sciences and biomedicine. In this study, we review the possibilities for the synthesis of inorganic, organic and hybrid nanomembranes mimicking and in some way surpassing living structures, consider their main properties of interest, give a short overview of possible pathways for their enhancement through multifunctionalization, and summarize some of their numerous applications reported to date, with a focus on recent findings. It is our aim to stress the role of functionalized synthetic biomimetic nanomembranes within the context of modern nanoscience and nanotechnologies. We hope to highlight the importance of the topic, as well as to stress its great applicability potentials in many facets of human life.
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Affiliation(s)
- Zoran Jakšić
- Center of Microelectronic Technologies, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, 11000 Belgrade, Serbia;
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56
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Li X, Cao X, Xiong J, Ge J. Enzyme-Metal Hybrid Catalysts for Chemoenzymatic Reactions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1902751. [PMID: 31468669 DOI: 10.1002/smll.201902751] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 07/10/2019] [Indexed: 05/21/2023]
Abstract
Enzyme-metal hybrid catalysts (EMHCs), which combine enzymatic and metal catalysis, provide tremendous possibilities for new chemoenzymatic cascade reactions. Here, an overview of the representative achievements in the design of EMHCs and their applications in chemoenzymatic cascade reactions are presented. The preparation of hybrid catalysts is classified into two categories: coimmobilized enzyme-metal heterogeneous catalysts and carrier-free enzyme-metal bioconjugates. Examples of one-pot chemoenzymatic cascade processes catalyzed by the hybrid catalysts are then provided as potential applications. Finally, the limitations and future perspectives of EMHCs are discussed.
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Affiliation(s)
- Xiaoyang Li
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Xun Cao
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Jiarong Xiong
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| | - Jun Ge
- Key Laboratory for Industrial Biocatalysis, Ministry of Education, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
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57
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Dey S, Saha J. Minimal Coarse-Grained Modeling toward Implicit Solvent Simulation of Generic Bolaamphiphiles. J Phys Chem B 2020; 124:2938-2949. [DOI: 10.1021/acs.jpcb.0c00734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Somajit Dey
- Department of Physics, University of Calcutta, 92, A.P.C Road, Kolkata 700009, India
| | - Jayashree Saha
- Department of Physics, University of Calcutta, 92, A.P.C Road, Kolkata 700009, India
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58
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Josey BP, Heinrich F, Silin V, Lösche M. Association of Model Neurotransmitters with Lipid Bilayer Membranes. Biophys J 2020; 118:1044-1057. [PMID: 32032504 DOI: 10.1016/j.bpj.2020.01.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/08/2020] [Accepted: 01/15/2020] [Indexed: 11/15/2022] Open
Abstract
Aimed at reproducing the results of electrophysiological studies of synaptic signal transduction, conventional models of neurotransmission are based on the specific binding of neurotransmitters to ligand-gated receptor ion channels. However, the complex kinetic behavior observed in synaptic transmission cannot be reproduced in a standard kinetic model without the ad hoc postulation of additional conformational channel states. On the other hand, if one invokes unspecific neurotransmitter adsorption to the bilayer-a process not considered in the established models-the electrophysiological data can be rationalized with only the standard set of three conformational receptor states that also depend on this indirect coupling of neurotransmitters via their membrane interaction. Experimental verification has been difficult because binding affinities of neurotransmitters to the lipid bilayer are low. We quantify this interaction with surface plasmon resonance to measure equilibrium dissociation constants in neurotransmitter membrane association. Neutron reflection measurements on artificial membranes, so-called sparsely tethered bilayer lipid membranes, reveal the structural aspects of neurotransmitters' association with zwitterionic and anionic bilayers. We thus establish that serotonin interacts nonspecifically with the membrane at physiologically relevant concentrations, whereas γ-aminobutyric acid does not. Surface plasmon resonance shows that serotonin adsorbs with millimolar affinity, and neutron reflectometry shows that it penetrates the membrane deeply, whereas γ-aminobutyric is excluded from the bilayer.
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Affiliation(s)
- Brian P Josey
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania
| | - Frank Heinrich
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania; National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, Maryland
| | - Vitalii Silin
- Institute for Bioscience and Biotechnology Research, Rockville, Maryland
| | - Mathias Lösche
- Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania; National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, Maryland; Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania.
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59
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Huang H, Jiang R, Feng Y, Ouyang H, Zhou N, Zhang X, Wei Y. Recent development and prospects of surface modification and biomedical applications of MXenes. NANOSCALE 2020; 12:1325-1338. [PMID: 31872839 DOI: 10.1039/c9nr07616f] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
MXenes, as a novel kind of two-dimensional (2D) materials, were first discovered by Gogotsi et al. in 2011. Owing to their multifarious chemical compositions and outstanding physicochemical properties, the novel types of 2D materials have attracted intensive research interest for potential applications in various fields such as energy storage and conversion, environmental remediation, catalysis, and biomedicine. Although many achievements have been made in recent years, there still remains a lack of reviews to summarize these recent advances of MXenes, especially in biomedical fields. Understanding the current status of surface modification, biomedical applications and toxicity of MXenes and related materials will give some inspiration to the development of novel methods for the preparation of multifunctional MXene-based materials and promote the practical biomedical applications of MXenes and related materials. In this review, we present the recent developments in the surface modification of MXenes and the biomedical applications of MXene-based materials. In the first section, some typical surface modification strategies were introduced and the related issues were also discussed. Then, the potential biomedical applications (such as biosensor, biological imaging, photothermal therapy, drug delivery, theranostic nanoplatforms, and antibacterial agents) of MXenes and related materials were summarized and highlighted in the following sections. In the last section, the toxicity and biocompatibility of MXenes in vitro were mentioned. Finally, the development, future directions and challenges about the surface modification of MXene-based materials for biomedical applications were discussed. We believe that this review article will attract great interest from the scientists in materials, chemistry, biomedicine and related fields and promote the development of MXenes and related materials for biomedical applications.
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Affiliation(s)
- Hongye Huang
- School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi 330031, China.
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60
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Abstract
The molecular scale pore structure, called nanopore, can be formed from protein ion channels by genetic engineering or fabricated on solid substrates using fashion nanotechnology. Target molecules in interaction with the functionalized lumen of nanopore, can produce characteristic changes in the pore conductance, which act as fingerprints, allowing us to identify single molecules and simultaneously quantify each target species in the mixture. Nanopore sensors have been created for tremendous biomedical detections, with targets ranging from metal ions, drug compounds and cellular second messengers, to proteins and DNAs. Recently, we have used the nanopore technique to dissect folding and unfolding mechanism of a single G-quadruplex DNA aptamer regulated by a variety of ions; we also created a portable and durable molecular device that integrated a protein pore sensor with a solidified lipid membrane for real-time detection.
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Affiliation(s)
- L Q Gu
- Biological Engineering and Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri 65211, USA
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61
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Alharbi ARM, Andersson JM, Köper I, Andersson GG. Investigating the Structure of Self-Assembled Monolayers Related to Biological Cell Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14213-14221. [PMID: 31596586 DOI: 10.1021/acs.langmuir.9b02553] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Tethered bilayer lipid membranes are solid supported lipid membranes, where the inner leaflet is covalently linked to the solid supported substrate through anchorlipids. These anchorlipids form a self-assembled monolayer, which serves as the basis of the membrane and also provides submembrane space. The molecular structure and composition of this monolayer has thus significant influence on the membrane structural and functional properties. The density of the self-assembled monolayer can be tailored by adding small molecules to the monolayer. Here, the structure of fully tethered and sparsely tethered monolayers, where the anchorlipid has been diluted with a small surface-active thiol, has been analyzed using neutral impact collision ion scattering spectroscopy, X-ray photoelectron spectroscopy, and metastable induced electron spectroscopy. Combination of these three techniques allowed description of the self-assembly process in detail. The monolayers have been characterized in terms of layer thickness and orientation of the lipids.
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Affiliation(s)
| | - Jakob M Andersson
- Biosensor Technologies , Austrian Institute of Technology , 1210 Vienna , Austria
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62
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Vanuytsel S, Carniello J, Wallace MI. Artificial Signal Transduction across Membranes. Chembiochem 2019; 20:2569-2580. [DOI: 10.1002/cbic.201900254] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/09/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Steven Vanuytsel
- Department of ChemistryKing's College London Britannia House 7 Trinity Street London SE1 1DB UK
- London Centre for Nanotechnology Strand London WC2R 2LS UK
| | - Joanne Carniello
- Department of ChemistryKing's College London Britannia House 7 Trinity Street London SE1 1DB UK
- London Centre for Nanotechnology Strand London WC2R 2LS UK
| | - Mark Ian Wallace
- Department of ChemistryKing's College London Britannia House 7 Trinity Street London SE1 1DB UK
- London Centre for Nanotechnology Strand London WC2R 2LS UK
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63
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Shehzad MA, Wang Y, Yasmin A, Ge X, He Y, Liang X, Zhu Y, Hu M, Xiao X, Ge L, Jiang C, Yang Z, Guiver MD, Wu L, Xu T. Biomimetic Nanocones that Enable High Ion Permselectivity. Angew Chem Int Ed Engl 2019; 58:12646-12654. [DOI: 10.1002/anie.201905972] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 07/07/2019] [Indexed: 01/12/2023]
Affiliation(s)
- Muhammad A. Shehzad
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
- Advanced Materials and Membrane Technology CentreDepartment of Polymer and Process EngineeringUniversity of Engineering and Technology Lahore G.T. Road Lahore 54890 Pakistan
| | - Yaoming Wang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Aqsa Yasmin
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
- Advanced Materials and Membrane Technology CentreDepartment of Polymer and Process EngineeringUniversity of Engineering and Technology Lahore G.T. Road Lahore 54890 Pakistan
| | - Xiaolin Ge
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Yubin He
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Xian Liang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Yuan Zhu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Min Hu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Xinle Xiao
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Liang Ge
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Chenxiao Jiang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Zhengjin Yang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Michael D. Guiver
- State Key Laboratory of EnginesSchool of Mechanical Engineering, and Collaborative Innovation Center of Chemical Science and EngineeringTianjin University 92 Weijin Road Tianjin 300072 China
| | - Liang Wu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
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64
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Enhancement of membrane protein reconstitution on 3D free-standing lipid bilayer array in a microfluidic channel. Biosens Bioelectron 2019; 141:111404. [DOI: 10.1016/j.bios.2019.111404] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 05/24/2019] [Accepted: 06/01/2019] [Indexed: 12/11/2022]
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65
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Shehzad MA, Wang Y, Yasmin A, Ge X, He Y, Liang X, Zhu Y, Hu M, Xiao X, Ge L, Jiang C, Yang Z, Guiver MD, Wu L, Xu T. Biomimetic Nanocones that Enable High Ion Permselectivity. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905972] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Muhammad A. Shehzad
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
- Advanced Materials and Membrane Technology CentreDepartment of Polymer and Process EngineeringUniversity of Engineering and Technology Lahore G.T. Road Lahore 54890 Pakistan
| | - Yaoming Wang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Aqsa Yasmin
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
- Advanced Materials and Membrane Technology CentreDepartment of Polymer and Process EngineeringUniversity of Engineering and Technology Lahore G.T. Road Lahore 54890 Pakistan
| | - Xiaolin Ge
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Yubin He
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Xian Liang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Yuan Zhu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Min Hu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Xinle Xiao
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Liang Ge
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Chenxiao Jiang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Zhengjin Yang
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Michael D. Guiver
- State Key Laboratory of EnginesSchool of Mechanical Engineering, and Collaborative Innovation Center of Chemical Science and EngineeringTianjin University 92 Weijin Road Tianjin 300072 China
| | - Liang Wu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter ChemistryCollaborative Innovation Centre of Chemistry for Energy MaterialsDepartment of Applied ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of China Hefei 230026 China
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66
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Inerolysin and vaginolysin, the cytolysins implicated in vaginal dysbiosis, differently impair molecular integrity of phospholipid membranes. Sci Rep 2019; 9:10606. [PMID: 31337831 PMCID: PMC6650466 DOI: 10.1038/s41598-019-47043-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 07/09/2019] [Indexed: 02/07/2023] Open
Abstract
The pore-forming toxins, inerolysin (INY) and vaginolysin (VLY), produced by vaginal bacteria Lactobacillus iners and Gardnerella vaginalis were studied using the artificial cholesterol-rich tethered bilayer membranes (tBLMs) by electrochemical techniques. The electrochemical impedance spectroscopy (EIS) of tBLMs attested for the toxin-induced impairment of the integrity of phospholipid membranes. This observation was in line with the atomic force microscopy data demonstrating formation of oligomeric protein assemblies in tBLMs. These assemblies exhibited different morphologies: VLY mostly formed complete rings, whereas INY produced arciform structures. We found that both EIS (membrane damage) and the surface plasmon resonance (protein binding) data obtained on tBLMs are in-line with the data obtained in human cell lysis experiments. EIS, however, is capable of capturing effects inaccessible for biological activity assays. Specifically, we found that the INY-induced damage of tBLMs is nearly a linear function of membrane cholesterol content, whereas VLY triggered significant damage only at high (50 mol%) cholesterol concentrations. The observed differences of INY and VLY activities on phospholipid membranes might have clinical importance: both toxin-producing bacteria have been found in healthy vagina and dysbiosis, suggesting the need for adaptation at different vaginal conditions. Our results broaden the possibilities of application of tBLMs in medical diagnostics.
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Abraham S, Heckenthaler T, Morgenstern Y, Kaufman Y. Effect of Temperature on the Structure, Electrical Resistivity, and Charge Capacitance of Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8709-8715. [PMID: 31244251 DOI: 10.1021/acs.langmuir.9b00726] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Supported lipid bilayers with incorporated membrane proteins have promising potential for diverse applications, such as filtration processes, drug delivery, and biosensors. For these applications, the continuity (lack of defects), electrical resistivity, and charge capacitance of the lipid bilayers are crucial. Here, we highlight the effects of temperature changes and the rate of temperature changes on the vertical and lateral expansion and contraction of lipid bilayers, which in turn affect the lipid bilayer resistivity and capacitance. We focused on lipid bilayers that consist of 50 mol % dimyristoyl- sn-glycero-3-phosphocholine (zwitterionic lipid) and 50 mol % dimyristoyl-3-trimethylammonium-propane (positively charged lipid) lipids. This lipid mixture is known to self-assemble into a continuous lipid bilayer on silicon wafers. It is shown experimentally and explained theoretically that slow cooling (e.g., -0.4 °C min-1) increases the resistivity significantly and reduces the capacitance of lipid bilayers, and these trends are reversed by heating. However, fast cooling (∼ -10 °C min-1 or faster) damages the membrane and reduces the resistivity and capacitance of lipid bilayers to practically zero. Importantly, the addition of 50 mol % cholesterol to lipid bilayers prevents the resistivity and capacitance reduction after fast cooling. It is argued that the ratio of lipid diffusion coefficient to thermal expansion/contraction rate (proportional to the heating/cooling rate) is the crucial parameter that determines the effects of temperature changes on lipids bilayers. A high ratio (fast lipid diffusion) increases the lipid bilayer resistivity and decreases the capacitance upon cooling and vice versa. Similar trends are expected for lipid membranes that consist of other lipids or lipidlike mixtures.
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Affiliation(s)
- Shiju Abraham
- The Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research , Ben-Gurion University of the Negev , Sde Boqer 8499000 , Israel
| | - Tabea Heckenthaler
- The Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research , Ben-Gurion University of the Negev , Sde Boqer 8499000 , Israel
| | - Yakov Morgenstern
- The Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research , Ben-Gurion University of the Negev , Sde Boqer 8499000 , Israel
| | - Yair Kaufman
- The Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research , Ben-Gurion University of the Negev , Sde Boqer 8499000 , Israel
- Center for Bioengineering , University of California Santa Barbara , Santa Barbara , California 93106 , United States
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68
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Khalil-Mgharbel A, Polena H, Dembélé PK, Hasan Sohag MM, Alcaraz JP, Martin DK, Vilgrain I. A Biomimetic Lipid Membrane Device Reveals the Interaction of Cancer Biomarkers with Human Serum Lipidic Moieties. Biotechnol J 2019; 13:e1800463. [PMID: 30457706 DOI: 10.1002/biot.201800463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Revised: 11/04/2018] [Indexed: 12/21/2022]
Abstract
A major problem for the detection of cancer biomarkers in plasma or serum is that common clinical practice does not require the patient to be in a fasting state. Considering that lipoproteins are the main population affected by food intake, the authors hypothesized that biomarkers could be embedded in lipid particles and thereby opens a new avenue for detection. Using the recently published biomarker, soluble VE-cadherin (sVE), the authors tested our hypothesis using techniques of biophysics, biochemistry and the tools of nanobiotechnology on serum samples from kidney cancer patients (n = 106). Optical density as well as contact angle measurements of serum revealed heterogeneity in the particle content of the serum samples. Isolation of the lipidic moieties by ultracentrifugation showed that sVE was detected in this compartment. Further, isolation of lipoprotein subclasses by precipitation with sodium phosphotungstate and MgCl2 , showed that HDL carried the majority of sVE. Immunoprecipitation of sVE confirmed that it was associated with Apolipoprotein A1, a major compound of HDL. Using a biomimetic lipid bilayer membrane coupled with impedance spectroscopy the authors quantified, in real-time, that the sVE adsorbed to the lipid bilayer membrane without altering its structure. Taken together, these results show for the first time a direct interaction of a cancer biomarker with lipids. The authors anticipate these results to prompt fasting for future blood tests for large-scale studies in the biomarkers research field.
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Affiliation(s)
- Abir Khalil-Mgharbel
- University Grenoble Alpes, INSERM, CNRS, BIG-BCI Biology of Cancer and Infection, UMR_S 1036, Grenoble, F-38054, France
| | - Helena Polena
- University Grenoble Alpes, INSERM, CNRS, BIG-BCI Biology of Cancer and Infection, UMR_S 1036, Grenoble, F-38054, France
| | - Paul K Dembélé
- University Grenoble Alpes, INSERM, CNRS, BIG-BCI Biology of Cancer and Infection, UMR_S 1036, Grenoble, F-38054, France
| | - Md Mehadi Hasan Sohag
- University Grenoble Alpes, INSERM, CNRS, BIG-BCI Biology of Cancer and Infection, UMR_S 1036, Grenoble, F-38054, France.,University Grenoble Alpes, SyNaBi, TIMC-IMAG/CNRS/INSERM, UMR 5525, Grenoble, F-38000, France
| | - Jean-Pierre Alcaraz
- University Grenoble Alpes, SyNaBi, TIMC-IMAG/CNRS/INSERM, UMR 5525, Grenoble, F-38000, France
| | - Donald K Martin
- University Grenoble Alpes, SyNaBi, TIMC-IMAG/CNRS/INSERM, UMR 5525, Grenoble, F-38000, France
| | - Isabelle Vilgrain
- University Grenoble Alpes, INSERM, CNRS, BIG-BCI Biology of Cancer and Infection, UMR_S 1036, Grenoble, F-38054, France
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69
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Prajapati DG, Kandasubramanian B. Progress in the Development of Intrinsically Conducting Polymer Composites as Biosensors. MACROMOL CHEM PHYS 2019; 220:1800561. [PMID: 32327916 PMCID: PMC7168478 DOI: 10.1002/macp.201800561] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/25/2019] [Indexed: 12/22/2022]
Abstract
Biosensors are analytical devices which find extensive applications in fields such as the food industry, defense sector, environmental monitoring, and in clinical diagnosis. Similarly, intrinsically conducting polymers (ICPs) and their composites have lured immense interest in bio-sensing due to their various attributes like compatibility with biological molecules, efficient electron transfer upon biochemical reactions, loading of bio-reagent, and immobilization of biomolecules. Further, they are proficient in sensing diverse biological species and compounds like glucose (detection limit ≈0.18 nm), DNA (≈10 pm), cholesterol (≈1 µm), aptamer (≈0.8 pm), and also cancer cells (≈5 pm mL-1) making them a potential candidate for biological sensing functions. ICPs and their composites have been extensively exploited by researchers in the field of biosensors owing to these peculiarities; however, no consolidated literature on the usage of conducting polymer composites for biosensing functions is available. This review extensively elucidates on ICP composites and doped conjugated polymers for biosensing functions of copious biological species. In addition, a brief overview is provided on various forms of biosensors, their sensing mechanisms, and various methods of immobilizing biological species along with the life cycle assessment of biosensors for various biosensing applications, and their cost analysis.
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Affiliation(s)
- Deepak G. Prajapati
- Nano Texturing LaboratoryDepartment of Metallurgical and Materials EngineeringDefence Institute of Advanced TechnologyMinistry of DefenceGirinagarPune411025India
| | - Balasubramanian Kandasubramanian
- Nano Texturing LaboratoryDepartment of Metallurgical and Materials EngineeringDefence Institute of Advanced TechnologyMinistry of DefenceGirinagarPune411025India
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70
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Polymer membranes as templates for bio-applications ranging from artificial cells to active surfaces. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.047] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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71
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Electrochemical impedance of randomly distributed defects in tethered phospholipid bilayers: Finite element analysis. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.12.148] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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72
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Priske G, Su Z, Abbasi F, Lipkowski J, Auzanneau FI. Synthesis and electrochemical characterization of 4-thio pseudo-glycolipids as candidate tethers for lipid bilayer models. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.12.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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73
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Fujigaya T. Development of Thermoelectric Conversion Materials Using Carbon Nanotube Sheets. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20180272] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tsuyohiko Fujigaya
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- WPI-I2CNER, Kyushu University, Fukuoka 819-0395, Japan
- JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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74
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Gruhle K, Müller S, Meister A, Drescher S. Synthesis and aggregation behaviour of single-chain, 1,32-alkyl branched bis(phosphocholines): effect of lateral chain length. Org Biomol Chem 2019; 16:2711-2724. [PMID: 29589028 DOI: 10.1039/c8ob00424b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Three novel single-chain bis(phosphocholines) bearing two lateral alkyl chains of variable length next to the headgroup have been synthesized as model lipids for naturally occurring archaeal membrane lipids. The synthesis was realized using the Cu-catalyzed Grignard bis-coupling reaction of a primary bromide as a side part and a 1,ω-dibromide as a centre part. We could show that the aggregation behaviour of the resulting bolalipids strongly depends on the length of the lateral alkyl chain: the C3-branched bolalipid self-assembles into lamellar sheets, whereas the C6- and C9-analogues form nanofibres. The lamella-forming bolalipids could be used in the future to prepare stable and tailored liposomes for oral drug delivery.
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Affiliation(s)
- K Gruhle
- Institute of Pharmacy, Biophysical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
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75
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Penkauskas T, Preta G. Biological applications of tethered bilayer lipid membranes. Biochimie 2019; 157:131-141. [DOI: 10.1016/j.biochi.2018.11.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/19/2018] [Indexed: 12/16/2022]
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76
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Alghalayini A, Garcia A, Berry T, Cranfield CG. The Use of Tethered Bilayer Lipid Membranes to Identify the Mechanisms of Antimicrobial Peptide Interactions with Lipid Bilayers. Antibiotics (Basel) 2019; 8:antibiotics8010012. [PMID: 30704119 PMCID: PMC6466558 DOI: 10.3390/antibiotics8010012] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 01/28/2019] [Accepted: 01/29/2019] [Indexed: 01/29/2023] Open
Abstract
This review identifies the ways in which tethered bilayer lipid membranes (tBLMs) can be used for the identification of the actions of antimicrobials against lipid bilayers. Much of the new research in this area has originated, or included researchers from, the southern hemisphere, Australia and New Zealand in particular. More and more, tBLMs are replacing liposome release assays, black lipid membranes and patch-clamp electrophysiological techniques because they use fewer reagents, are able to obtain results far more quickly and can provide a uniformity of responses with fewer artefacts. In this work, we describe how tBLM technology can and has been used to identify the actions of numerous antimicrobial agents.
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Affiliation(s)
- Amani Alghalayini
- School of Life Science, University of Technology Sydney, Ultimo, NSW 2007, Australia.
| | - Alvaro Garcia
- School of Life Science, University of Technology Sydney, Ultimo, NSW 2007, Australia.
| | - Thomas Berry
- School of Life Science, University of Technology Sydney, Ultimo, NSW 2007, Australia.
| | - Charles G Cranfield
- School of Life Science, University of Technology Sydney, Ultimo, NSW 2007, Australia.
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77
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Challita EJ, Freeman EC. Hydrogel Microelectrodes for the Rapid, Reliable, and Repeatable Characterization of Lipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15166-15173. [PMID: 30468580 DOI: 10.1021/acs.langmuir.8b02867] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Model lipid bilayer membranes provide approximations of natural cellular membranes that may be formed in the laboratory to study their mechanics and interactions with the surrounding environment. A new approach for their formation is proposed here based on the self-assembly of lipid monolayers at oil-water interfaces, creating a lipid-coated hydrogel-tipped electrode that produces a stable lipid membrane on the surface when introduced to a lipid-coated aqueous droplet. Membrane formation using the hydrogel microelectrode is tested for a variety of lipids and oils. The channel-forming peptide alamethicin is added to the membrane, and its functionality is verified. Finally, asymmetric membranes are created using varying lipid compositions, and the capacity for repeated quantification of membrane structure is demonstrated. The proposed hydrogel microelectrodes are compatible with multiple oils and lipids, simple to use, and suitable for detecting the presence of both biomolecular transporters and dissolved lipid compositions within aqueous droplets.
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Affiliation(s)
- Elio J Challita
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, College of Engineering , University of Georgia , 110 Riverbend Road , Athens , Georgia 30605 , United States
| | - Eric C Freeman
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, College of Engineering , University of Georgia , 110 Riverbend Road , Athens , Georgia 30605 , United States
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78
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Phase-segregated Membrane Model assessed by a combined SPR-AFM Approach. Colloids Surf B Biointerfaces 2018; 172:423-429. [DOI: 10.1016/j.colsurfb.2018.08.066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/09/2018] [Accepted: 08/29/2018] [Indexed: 12/22/2022]
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79
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Guo T, Gao J, Qin X, Zhang X, Xue H. A Novel Glucose Biosensor Based on Hierarchically Porous Block Copolymer Film. Polymers (Basel) 2018; 10:E723. [PMID: 30960648 PMCID: PMC6403682 DOI: 10.3390/polym10070723] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 06/27/2018] [Accepted: 06/28/2018] [Indexed: 11/16/2022] Open
Abstract
Enzymatic biosensors are widely used in clinical diagnostics, and electrode materials are essential for both the efficient immobilization of enzyme and the fast electron transfer between the active sites of enzyme and electrode surface. Electrode materials with a hierarchically porous structure can not only increase the specific surface area but also promote the electron transfer, facilitating the catalysis reaction. Block copolymer is a good candidate for preparation of film with a hierarchically porous structure due to its unique characteristics of self-assembly and phase separation. In the current work, hierarchically porous block copolymer film containing both micropores and nanopores was prepared by spinodal decomposition induced phase separation. The resultant copolymer film was adopted as the electrode material to immobilize glucose oxidase (GOx) for construction of an enzyme biosensor. Scanning electron microscopy (SEM), contact angle (CA) measurements, and Fourier-transform infrared (FTIR) and electrochemical impendence spectroscopy (EIS) were adopted to investigate the microstructure of the as-developed biosensor. Results demonstrated that the hierarchically porous block copolymer film offered a favorable and biocompatible microenvironment for proteins. These as-prepared glucose biosensors possessed a wide linear range (10⁻4500 μM), a low detection limit (0.05 μM), quick response (2 s), excellent stability, and selectivity. This work demonstrates that hierarchically porous block copolymer film is a good matrix candidate for the immobilization of the enzyme and provides a potential electrode material to construct novel biosensors with excellent performance.
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Affiliation(s)
- Teng Guo
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Jiefeng Gao
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Xiang Qin
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Xu Zhang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China. -
| | - Huaiguo Xue
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
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80
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Tunable cell-surface mimetics as engineered cell substrates. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:2076-2093. [PMID: 29935145 DOI: 10.1016/j.bbamem.2018.06.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 05/18/2018] [Accepted: 06/08/2018] [Indexed: 12/21/2022]
Abstract
Most recent breakthroughs in understanding cell adhesion, cell migration, and cellular mechanosensitivity have been made possible by the development of engineered cell substrates of well-defined surface properties. Traditionally, these substrates mimic the extracellular matrix (ECM) environment by the use of ligand-functionalized polymeric gels of adjustable stiffness. However, such ECM mimetics are limited in their ability to replicate the rich dynamics found at cell-cell contacts. This review focuses on the application of cell surface mimetics, which are better suited for the analysis of cell adhesion, cell migration, and cellular mechanosensitivity across cell-cell interfaces. Functionalized supported lipid bilayer systems were first introduced as biomembrane-mimicking substrates to study processes of adhesion maturation during adhesion of functionalized vesicles (cell-free assay) and plated cells. However, while able to capture adhesion processes, the fluid lipid bilayer of such a relatively simple planar model membrane prevents adhering cells from transducing contractile forces to the underlying solid, making studies of cell migration and cellular mechanosensitivity largely impractical. Therefore, the main focus of this review is on polymer-tethered lipid bilayer architectures as biomembrane-mimicking cell substrate. Unlike supported lipid bilayers, these polymer-lipid composite materials enable the free assembly of linkers into linker clusters at cellular contacts without hindering cell spreading and migration and allow the controlled regulation of mechanical properties, enabling studies of cellular mechanosensitivity. The various polymer-tethered lipid bilayer architectures and their complementary properties as cell substrates are discussed.
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81
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Lee TH, Hirst DJ, Kulkarni K, Del Borgo MP, Aguilar MI. Exploring Molecular-Biomembrane Interactions with Surface Plasmon Resonance and Dual Polarization Interferometry Technology: Expanding the Spotlight onto Biomembrane Structure. Chem Rev 2018; 118:5392-5487. [PMID: 29793341 DOI: 10.1021/acs.chemrev.7b00729] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The molecular analysis of biomolecular-membrane interactions is central to understanding most cellular systems but has emerged as a complex technical challenge given the complexities of membrane structure and composition across all living cells. We present a review of the application of surface plasmon resonance and dual polarization interferometry-based biosensors to the study of biomembrane-based systems using both planar mono- or bilayers or liposomes. We first describe the optical principals and instrumentation of surface plasmon resonance, including both linear and extraordinary transmission modes and dual polarization interferometry. We then describe the wide range of model membrane systems that have been developed for deposition on the chips surfaces that include planar, polymer cushioned, tethered bilayers, and liposomes. This is followed by a description of the different chemical immobilization or physisorption techniques. The application of this broad range of engineered membrane surfaces to biomolecular-membrane interactions is then overviewed and how the information obtained using these techniques enhance our molecular understanding of membrane-mediated peptide and protein function. We first discuss experiments where SPR alone has been used to characterize membrane binding and describe how these studies yielded novel insight into the molecular events associated with membrane interactions and how they provided a significant impetus to more recent studies that focus on coincident membrane structure changes during binding of peptides and proteins. We then discuss the emerging limitations of not monitoring the effects on membrane structure and how SPR data can be combined with DPI to provide significant new information on how a membrane responds to the binding of peptides and proteins.
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Affiliation(s)
- Tzong-Hsien Lee
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Daniel J Hirst
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Ketav Kulkarni
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Mark P Del Borgo
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Clayton , VIC 3800 , Australia
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82
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Özay B, Robertus CM, Negri JL, McCalla SE. First characterization of a biphasic, switch-like DNA amplification. Analyst 2018; 143:1820-1828. [PMID: 29577124 PMCID: PMC5969907 DOI: 10.1039/c8an00130h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We report the first DNA amplification chemistry with switch-like characteristics: the chemistry is biphasic, with an expected initial phase followed by an unprecedented high gain burst of product oligonucleotide in a second phase. The first and second phases are separated by a temporary plateau, with the second phase producing 10 to 100 times more product than the first. The reaction is initiated when an oligonucleotide binds and opens a palindromic looped DNA template with two binding domains. Upon loop opening, the oligonucleotide trigger is rapidly amplified through cyclic extension and nicking of the bound trigger. Loop opening and DNA association drive the amplification reaction, such that reaction acceleration in the second phase is correlated with DNA association thermodynamics. Without a palindromic sequence, the chemistry resembles the exponential amplification reaction (EXPAR). EXPAR terminates at the initial plateau, revealing a previously unknown phenomenon that causes early reaction cessation in this popular oligonucleotide amplification reaction. Here we present two distinct types of this biphasic reaction chemistry and propose dominant reaction pathways for each type based on thermodynamic arguments. These reactions create an endogenous switch-like output that reacts to approximately 1 pM oligonucleotide trigger. The chemistry is isothermal and can be adapted to respond to a broad range of input target molecules such as proteins, genomic bacterial DNA, viral DNA, and microRNA. This rapid DNA amplification reaction could potentially impact a variety of disciplines such as synthetic biology, biosensors, DNA computing, and clinical diagnostics.
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Affiliation(s)
- Burcu Özay
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT 59717, USA.
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83
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Drescher S, Otto C, Müller S, Garamus VM, Garvey CJ, Grünert S, Lischka A, Meister A, Blume A, Dobner B. Impact of Headgroup Asymmetry and Protonation State on the Aggregation Behavior of a New Type of Glycerol Diether Bolalipid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4360-4373. [PMID: 29557659 DOI: 10.1021/acs.langmuir.8b00527] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the present work, we describe the synthesis and the temperature-dependent aggregation behavior of a new class of asymmetrical glycerol diether bolalipids. These bolalipids are composed of a membrane-spanning alkyl chain with 32 carbon atoms (C32) in the sn-3 position, a methyl-branched C16 alkyl chain in the sn-2 position, and a zwitterionic phosphocholine headgroup in the sn-1 position of a glycerol moiety. The long C32 alkyl chain is terminated either by a second phosphocholine (PC-Gly(2C16Me)C32-PC) or by a phosphodimethylethanolamine headgroup (PC-Gly(2C16Me)C32-Me2PE). The temperature- and pH-dependent aggregation behavior of both lipids was studied using differential scanning calorimetry (DSC), Fourier transform infrared (FTIR) spectroscopy, small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) experiments. The morphology of the formed aggregates in an aqueous suspension was visualized by transmission electron microscopy (TEM). We show that PC-Gly(2C16Me)C32-PC and PC-Gly(2C16Me)C32-Me2PE at pH 5 self-assemble into large lamellar aggregates and large lipid vesicles. Within these structures, the bolalipid molecules are probably assembled in a monolayer with fully interdigitated chains. The lipid molecules seem to be tilted with respect to the layer normal to ensure a dense packing of the alkyl chains. A temperature increase leads to a transition from a lamellar gel phase to the liquid-crystalline phase at about 28-30 °C for both bolalipids. The lamellar aggregates of PC-Gly(2C16Me)C32-Me2PE started to transform into nanofibers when the pH value of the suspension was increased to above 11. At pH 12, these nanofibers were the dominant aggregates.
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Affiliation(s)
| | | | | | - Vasil M Garamus
- Helmholtz-Zentrum Geesthacht: Centre for Materials and Coastal Research (HZG) , Max-Planck-Strasse 1 , 21502 Geesthacht , Germany
| | - Christopher J Garvey
- Australian Nuclear Science and Technology Organisation (ANSTO) , Kirrawee DC , NSW Australia
| | | | | | - Annette Meister
- Institute of Biochemistry and Biotechnology , MLU Halle-Wittenberg , Kurt-Mothes-Strasse 3 , 06120 Halle (Saale) , Germany
| | - Alfred Blume
- Institute of Chemistry , MLU Halle-Wittenberg , von-Danckelmann-Platz 4 , 06120 Halle (Saale) , Germany
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84
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Joshi H, Maiti PK. Structure and electrical properties of DNA nanotubes embedded in lipid bilayer membranes. Nucleic Acids Res 2018; 46:2234-2242. [PMID: 29136243 PMCID: PMC5861442 DOI: 10.1093/nar/gkx1078] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 09/25/2017] [Accepted: 11/03/2017] [Indexed: 01/18/2023] Open
Abstract
Engineering the synthetic nanopores through lipid bilayer membrane to access the interior of a cell is a long persisting challenge in biotechnology. Here, we demonstrate the stability and dynamics of a tile-based 6-helix DNA nanotube (DNT) embedded in POPC lipid bilayer using the analysis of 0.2 μs long equilibrium MD simulation trajectories. We observe that the head groups of the lipid molecules close to the lumen cooperatively tilt towards the hydrophilic sugar-phosphate backbone of DNA and form a toroidal structure around the patch of DNT protruding in the membrane. Further, we explore the effect of ionic concentrations to the in-solution structure and stability of the lipid-DNT complex. Transmembrane ionic current measurements for the constant electric field MD simulation provide the I-V characteristics of the water filled DNT lumen in lipid membrane. With increasing salt concentrations, the measured values of transmembrane ionic conductance of the porous DNT lumen vary from 4.3 to 20.6 nS. Simulations of the DNTs with ssDNA and dsDNA overhangs at the mouth of the pore show gating effect with remarkable difference in the transmembrane ionic conductivities for open and close state nanopores.
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Affiliation(s)
- Himanshu Joshi
- Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - Prabal K Maiti
- Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
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85
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Miyashita W, Saeki D, Matsuyama H. Formation of supported lipid bilayers on porous polymeric substrates induced by hydrophobic interaction. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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86
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Kim YH, Hang L, Cifelli JL, Sept D, Mayer M, Yang J. Frequency-Based Analysis of Gramicidin A Nanopores Enabling Detection of Small Molecules with Picomolar Sensitivity. Anal Chem 2018; 90:1635-1642. [DOI: 10.1021/acs.analchem.7b02961] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
| | | | | | - David Sept
- Department
of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2110, United States
| | - Michael Mayer
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
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87
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Ji Y, Woods RJ. Quantifying Weak Glycan-Protein Interactions Using a Biolayer Interferometry Competition Assay: Applications to ECL Lectin and X-31 Influenza Hemagglutinin. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1104:259-273. [PMID: 30484253 DOI: 10.1007/978-981-13-2158-0_13] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
This chapter introduces two formats using bio-layer interferometry competition assays to determine the solution K D values of weak glycan-protein interactions. This approach overcomes the challenge of determining weak interactions while minimizing the amount of reagents required. Accurate solution K D values aid in understanding the complex relationships between monomeric versus multimeric interactions and affinity versus avidity. The assays have been applied to a well-studied lectin (Erythrina crista-galli lectin) and influenza hemagglutinin (X-31). The solution K D values determined from this approach are in good agreement with previous reported literature values from isothermal titration calorimetry and NMR. Additionally, this approach appears robust and precise.
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Affiliation(s)
- Ye Ji
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, USA
| | - Robert J Woods
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA, USA.
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88
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Du K, Niu S, Chen X, Zhang P. A novel highly selective ratiometric fluorescent sensor for relay recognition of Zn 2+ and H 2 PO 4 −. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2017.09.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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89
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Skalová Š, Vyskočil V, Barek J, Navrátil T. Model Biological Membranes and Possibilities of Application of Electrochemical Impedance Spectroscopy for their Characterization. ELECTROANAL 2017. [DOI: 10.1002/elan.201700649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Štěpánka Skalová
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences; Dolejškova 3 182 23 Prague 8 Czech Republic
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Vlastimil Vyskočil
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Jiří Barek
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Tomáš Navrátil
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences; Dolejškova 3 182 23 Prague 8 Czech Republic
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90
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Electrochemical Analysis of Enzyme Based on the Self-Assembly of Lipid Bilayer on an Electrode Surface Mediated by Hydrazone Chemistry. Anal Chem 2017; 89:13245-13251. [DOI: 10.1021/acs.analchem.7b03197] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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91
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Zhu L, Gu D, Liu Q. Hydrogen Peroxide Sensing Based on Inner Surfaces Modification of Solid-State Nanopore. NANOSCALE RESEARCH LETTERS 2017; 12:422. [PMID: 28637348 PMCID: PMC5478554 DOI: 10.1186/s11671-017-2190-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Accepted: 06/08/2017] [Indexed: 05/20/2023]
Abstract
There are many techniques for the detection of molecules. But detection of molecules through solid-state nanopore in a solution is one of the promising, high-throughput, and low-cost technology used these days. In the present investigation, a solid-state nanopore platform was fabricated for the detection of hydrogen peroxide (H2O2), which is not only a label free product but also a significant participant in the redox reaction. We have successfully fabricated silicon nitride (Si3N4) nanopores with diameters of ~50 nm by using a focused Ga ion beam, the inner surface of the nanopore has been modified with horseradish peroxidase (HRP) by employing carbodiimide coupling chemistry. The immobilized HRP enzymes have ability to induce redox reactions in a single nanopore channel. Moreover, a real-time single aggregated ABTS•+ molecular translocation events were monitored and investigated. The designed solid-state nanopore biosensor is reversible and can be applied to detect H2O2 multiple times.
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Affiliation(s)
- Libo Zhu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, No. 2, Sipailou, Nanjing, 210096, People's Republic of China
| | - Dejian Gu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, No. 2, Sipailou, Nanjing, 210096, People's Republic of China
| | - Quanjun Liu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, No. 2, Sipailou, Nanjing, 210096, People's Republic of China.
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92
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Sugawara M. Transmembrane Signaling with Lipid-Bilayer Assemblies as a Platform for Channel-Based Biosensing. CHEM REC 2017; 18:433-444. [PMID: 29135061 DOI: 10.1002/tcr.201700046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 11/02/2017] [Indexed: 11/08/2022]
Abstract
Artificial and natural lipid membranes that elicit transmembrane signaling is are useful as a platform for channel-based biosensing. In this account we summarize our research on the design of transmembrane signaling associated with lipid bilayer membranes containing nanopore-forming compounds. Channel-forming compounds, such as receptor ion-channels, channel-forming peptides and synthetic channels, are embedded in planar and spherical bilayer lipid membranes to develop highly sensitive and selective biosensing methods for a variety of analytes. The membrane-bound receptor approach is useful for introducing receptor sites on both planar and spherical bilayer lipid membranes. Natural receptors in biomembranes are also used for designing of biosensing methods.
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Affiliation(s)
- Masao Sugawara
- Department of chemistry, College of humanities and sciences, Nihon University, Tokyo, Japan
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93
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Markowski T, Müller S, Dobner B, Meister A, Blume A, Drescher S. An Asymmetrical Glycerol Diether Bolalipid with Protonable Phosphodimethylethanolamine Headgroup: The Impact of pH on Aggregation Behavior and Miscibility with DPPC. Polymers (Basel) 2017; 9:E573. [PMID: 30965876 PMCID: PMC6418739 DOI: 10.3390/polym9110573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 10/25/2017] [Accepted: 10/31/2017] [Indexed: 01/07/2023] Open
Abstract
Investigations regarding the self-assembly of (bola)phospholipids in aqueous media are crucial to understand the complex relationship between chemical structure of lipids and the shape and size of their aggregates in water. Here, we introduce a new asymmetrical glycerol diether bolaphospholipid, the compound Me₂PE-Gly(2C16)C32-OH. This bolalipid contains a long (C32) ω-hydroxy alkyl chain bond to glycerol in the sn-3 position, a C16 alkyl chain at the sn-2 position, and a protonable phosphodimethylethanolamine (Me₂PE) headgroup at the sn-1 position of the glycerol. The aggregation behavior of this bolalipid was studied as a function of temperature and pH using transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR) spectroscopy. We show that this bolalipid aggregates into condensed lamellar sheets in acidic milieu and in large sheet-like aggregates at neutral pH-value. By contrast, at a pH-value of 10, where the Me₂PE headgroup is only partially protonated, small lipid disks with diameter 50⁻100 nm were additionally found. Moreover, the miscibility of this asymmetrical bolalipid with the bilayer-forming phosphatidylcholine DPPC was investigated by means of DSC and TEM. The incorporation of bolalipids into phospholipid membranes could result in stabilized liposomes applicable for drug delivery purposes. We show that mixtures of DPPC and Me₂PE-Gly(2C16)C32-OH form large lamellar aggregates at pH of 5, 7, and 10. However, closed lipid vesicles (liposomes) with an increased thermal stability were not found.
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Affiliation(s)
- Thomas Markowski
- Institute of Pharmacy-Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
| | - Sindy Müller
- Institute of Pharmacy-Biophysical Pharmacy, MLU Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
| | - Bodo Dobner
- Institute of Pharmacy-Biochemical Pharmacy, Martin Luther University (MLU) Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
| | - Annette Meister
- Institute of Chemistry-Biophysical Chemistry, MLU Halle-Wittenberg, von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany.
- Institute of Biochemistry and Biotechnology, MLU Halle-Wittenberg, Kurt-Mothes-Strasse 3, 06120 Halle (Saale), Germany.
| | - Alfred Blume
- Institute of Chemistry-Biophysical Chemistry, MLU Halle-Wittenberg, von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany.
| | - Simon Drescher
- Institute of Pharmacy-Biophysical Pharmacy, MLU Halle-Wittenberg, Wolfgang-Langenbeck-Strasse 4, 06120 Halle (Saale), Germany.
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94
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Gatterdam V, Frutiger A, Stengele KP, Heindl D, Lübbers T, Vörös J, Fattinger C. Focal molography is a new method for the in situ analysis of molecular interactions in biological samples. NATURE NANOTECHNOLOGY 2017; 12:1089-1095. [PMID: 28945239 DOI: 10.1038/nnano.2017.168] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 07/11/2017] [Indexed: 05/09/2023]
Abstract
Focal molography is a next-generation biosensor that visualizes specific biomolecular interactions in real time. It transduces affinity modulation on the sensor surface into refractive index modulation caused by target molecules that are bound to a precisely assembled nanopattern of molecular recognition sites, termed the 'mologram'. The mologram is designed so that laser light is scattered at specifically bound molecules, generating a strong signal in the focus of the mologram via constructive interference, while scattering at nonspecifically bound molecules does not contribute to the effect. We present the realization of molograms on a chip by submicrometre near-field reactive immersion lithography on a light-sensitive monolithic graft copolymer layer. We demonstrate the selective and sensitive detection of biomolecules, which bind to the recognition sites of the mologram in various complex biological samples. This allows the label-free analysis of non-covalent interactions in complex biological samples, without a need for extensive sample preparation, and enables novel time- and cost-saving ways of performing and developing immunoassays for diagnostic tests.
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Affiliation(s)
- Volker Gatterdam
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Andreas Frutiger
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | | | | | - Thomas Lübbers
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, 4070 Basel, Switzerland
| | - Janos Vörös
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Christof Fattinger
- Roche Pharma Research and Early Development, Roche Innovation Center Basel, 4070 Basel, Switzerland
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95
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Maccarini M, Gayet L, Alcaraz JP, Liguori L, Stidder B, Watkins EB, Lenormand JL, Martin DK. Functional Characterization of Cell-Free Expressed OprF Porin from Pseudomonas aeruginosa Stably Incorporated in Tethered Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9988-9996. [PMID: 28845995 DOI: 10.1021/acs.langmuir.7b01731] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OprF has a central role in Pseudomonas aeruginosa virulence and thus provides a putative target for either vaccines or antibiotic cofactors that could overcome the bacterium's natural resistance to antibiotics. Here we describe a procedure to optimize the production of highly pure and functional OprF porins that are then incorporated into a tethered lipid bilayer. This is a stable biomimetic system that provides the capability to investigate structural aspects and function of OprF using and neutron reflectometry and electrical impedance spectroscopy. The recombinant OprF produced using the optimized cell-free procedure yielded a quantity of between 0.5 to 1.0 mg/mL with a purity ranging from 85 to 91% in the proteoliposomes. The recombinant OprF is capable of binding IFN-γ and is correctly folded in the proteoliposomes. Because OprF proteins form pores the biomimetic system allowed the measurement of OprF conductance using impedance spectroscopy. The neutron reflectometry measurements showed that the OprF protein is incorporated into the lipid bilayer but with parts of the protein in both the regions above and below the lipid bilayer. Those structural aspects are coherent with the current assumed structure of a transmembrane N-terminal domain composed by eight stranded beta-barrels and a globular C-terminal domain located in the periplasm. Currently there are no crystal structures available for OprF. The experimental model system that we describe provides a basis for further fundamental studies of OprF and particularly for the ongoing biotechnological development of OprF as a target for antibacterial drugs.
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Affiliation(s)
- Marco Maccarini
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
| | - Landry Gayet
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
| | | | - Lavinia Liguori
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
| | - Barry Stidder
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
| | - Erik B Watkins
- Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Jean-Luc Lenormand
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
| | - Donald K Martin
- TIMC/IMAG (UMR 5525), Université de Grenoble Alpes , Grenoble 38000, France
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96
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Darbandi A, Datta D, Patel K, Lin G, Stroscio MA, Dutta M. Molecular beacon anchored onto a graphene oxide substrate. NANOTECHNOLOGY 2017; 28:375501. [PMID: 28696331 DOI: 10.1088/1361-6528/aa7e50] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this article, we report a graphene oxide-based nanosensor incorporating semiconductor quantum dots linked to DNA-aptamers that functions as a 'turn-off' fluorescent nanosensor for detection of low concentrations of analytes. A specific demonstration of this turn-off aptasensor is presented for the case of the detection of mercury (II) ions. In this system, ensembles of aptamer-based quantum-dot sensors are anchored onto graphene oxide (GO) flakes which provide a platform for analyte detection in the vicinity of GO. Herein, the operation of this ensemble-based nanosensor is demonstrated for mercury ions, which upon addition of mercury, quenching of the emission intensity from the quantum dots is observed due to resonance energy transfer between quantum dots and the gold nanoparticle connected via a mercury target aptamer. A key result is that the usually dominant effect of quenching of the quantum dot due to close proximity to the GO can be reduced to negligible levels by using a linker molecule in conjunctions with the aptamer-based nanosensor. The effect of ionic concentration of the background matrix on the emission intensity was also investigated. The sensor system is found to be highly selective towards mercury and exhibits a linear behavior (r 2 > 0.99) in the nanomolar concentration range. The detection limit of the sensor towards mercury with no GO present was found to be 16.5 nM. With GO attached to molecular beacon via 14 base, 35 base, and 51 base long linker DNA, the detection limit was found to be 38.4 nM, 9.45 nM, and 11.38 nM; respectively.
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Affiliation(s)
- Arash Darbandi
- University of Illinois at Chicago, Department of Bioengineering, United States of America
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97
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98
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Rameshkumar S, Kumaravel M. CHANGES IN THE ELECTRICAL PROPERTIES OF AGARGEL SUPPORTED BILAYER LIPID MEMBRANE BROUGHT ABOUT BY MIDAZOLAM. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.05.180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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99
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Howorka S. Building membrane nanopores. NATURE NANOTECHNOLOGY 2017; 12:619-630. [PMID: 28681859 DOI: 10.1038/nnano.2017.99] [Citation(s) in RCA: 188] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Accepted: 04/19/2017] [Indexed: 05/28/2023]
Abstract
Membrane nanopores-hollow nanoscale barrels that puncture biological or synthetic membranes-have become powerful tools in chemical- and biosensing, and have achieved notable success in portable DNA sequencing. The pores can be self-assembled from a variety of materials, including proteins, peptides, synthetic organic compounds and, more recently, DNA. But which building material is best for which application, and what is the relationship between pore structure and function? In this Review, I critically compare the characteristics of the different building materials, and explore the influence of the building material on pore structure, dynamics and function. I also discuss the future challenges of developing nanopore technology, and consider what the next-generation of nanopore structures could be and where further practical applications might emerge.
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Affiliation(s)
- Stefan Howorka
- Department of Chemistry, Institute of Structural Molecular Biology, University College London, London WC1H 0AJ, UK
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100
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Abstract
Leukemia is a cancer of blood cells and bone marrow, leading to death in many patients mainly in children. Over the last several years, aptamers generated by SELEX (Systematic evolution of ligands by exponential enrichment) method, have quickly become a new class of targeting ligands for drug delivery applications and recently have been widely exploited in different biomedical applications, due to several potent properties such as high binding affinity and selectivity, low or no immunogenicity and toxicity, low cost and thermal stability. In this review, we presented in details about aptamers involved in targeting, and treatment of leukemia. Moreover, some analytical approaches such as electrochemical and optical aptasensors were introduced for detection and diagnosis of leukemia. Finally, we discussed about the directions and challenges of aptamer application in this field.
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