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Stollmann A, Garcia-Guirado J, Hong JS, Rüedi P, Im H, Lee H, Ortega Arroyo J, Quidant R. Molecular fingerprinting of biological nanoparticles with a label-free optofluidic platform. Nat Commun 2024; 15:4109. [PMID: 38750038 PMCID: PMC11096335 DOI: 10.1038/s41467-024-48132-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 04/22/2024] [Indexed: 05/18/2024] Open
Abstract
Label-free detection of multiple analytes in a high-throughput fashion has been one of the long-sought goals in biosensing applications. Yet, for all-optical approaches, interfacing state-of-the-art label-free techniques with microfluidics tools that can process small volumes of sample with high throughput, and with surface chemistry that grants analyte specificity, poses a critical challenge to date. Here, we introduce an optofluidic platform that brings together state-of-the-art digital holography with PDMS microfluidics by using supported lipid bilayers as a surface chemistry building block to integrate both technologies. Specifically, this platform fingerprints heterogeneous biological nanoparticle populations via a multiplexed label-free immunoaffinity assay with single particle sensitivity. First, we characterise the robustness and performance of the platform, and then apply it to profile four distinct ovarian cell-derived extracellular vesicle populations over a panel of surface protein biomarkers, thus developing a unique biomarker fingerprint for each cell line. We foresee that our approach will find many applications where routine and multiplexed characterisation of biological nanoparticles are required.
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Affiliation(s)
- Alexia Stollmann
- Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
| | - Jose Garcia-Guirado
- Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
| | - Jae-Sang Hong
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - Pascal Rüedi
- Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland
| | - Hyungsoon Im
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA, 02114, USA
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - Hakho Lee
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA, 02114, USA
- Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - Jaime Ortega Arroyo
- Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland.
| | - Romain Quidant
- Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092, Zurich, Switzerland.
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2
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Zhou X, Chieng A, Wang S. Label-Free Optical Imaging of Nanoscale Single Entities. ACS Sens 2024; 9:543-554. [PMID: 38346398 PMCID: PMC10990724 DOI: 10.1021/acssensors.3c02526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
The advancement of optical microscopy technologies has achieved imaging of nanoscale objects, including nanomaterials, virions, organelles, and biological molecules, at the single entity level. Recently developed plasmonic and scattering based optical microscopy technologies have enabled label-free imaging of single entities with high spatial and temporal resolutions. These label-free methods eliminate the complexity of sample labeling and minimize the perturbation of the analyte native state. Additionally, these imaging-based methods can noninvasively probe the dynamics and functions of single entities with sufficient throughput for heterogeneity analysis. This perspective will review label-free single entity imaging technologies and discuss their principles, applications, and key challenges.
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Affiliation(s)
- Xinyu Zhou
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287, United States
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287, United States
| | - Andy Chieng
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287, United States
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
| | - Shaopeng Wang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, Arizona 85287, United States
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287, United States
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3
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Yang W, Wei Z, Nie Y, Tian Y. Optical Detection and Imaging of Nonfluorescent Matter at the Single-Molecule/Particle Level. J Phys Chem Lett 2022; 13:9618-9631. [PMID: 36214484 DOI: 10.1021/acs.jpclett.2c02228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Since the first optical detection of single molecules in 1989, single-molecule spectroscopy has developed rapidly and been widely applied in many areas. However, the vast majority of matter is extremely inefficient at emitting photons in our physical world, which seriously limits the applications of optical methods based on photoluminescence. In addition to indirect detection by fluorescence labeling, many efforts have been made to directly image nonfluorescent matter at the single-particle or single-molecule level in different ways based on the absorption or scattering interaction between light and matter. Herein, we review five popular methods for imaging nonfluorescent particles/molecules, including dark-field microscopy (DFM), surface plasmon resonance microscopy (SPRM), surface enhanced Raman microscopy (SERM), interferometric scattering microscopy (iSCAT), and photothermal microscopy (PTM). After summarizing the principles and applications of these methods, we compare the advantages and disadvantages of each method and describe further potential development and applications.
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Affiliation(s)
- Weiqing Yang
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University, Nanjing210023, China
| | - Zhihong Wei
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University, Nanjing210023, China
| | - Yan Nie
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University, Nanjing210023, China
| | - Yuxi Tian
- Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, Nanjing University, Nanjing210023, China
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4
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Schaefer KG, Pittman AE, Barrera FN, King GM. Atomic force microscopy for quantitative understanding of peptide-induced lipid bilayer remodeling. Methods 2022; 197:20-29. [PMID: 33164792 DOI: 10.1016/j.ymeth.2020.10.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/17/2020] [Accepted: 10/20/2020] [Indexed: 12/15/2022] Open
Abstract
A number of peptides are known to bind lipid bilayer membranes and cause these natural barriers to leak in an uncontrolled manner. Though membrane permeabilizing peptides play critical roles in cellular activity and may have promising future applications in the therapeutic arena, significant questions remain about their mechanisms of action. The atomic force microscope (AFM) is a single molecule imaging tool capable of addressing lipid bilayers in near-native fluid conditions. The apparatus complements traditional assays by providing local topographic maps of bilayer remodeling induced by membrane permeabilizing peptides. The information garnered from the AFM includes direct visualization and statistical analyses of distinct bilayer remodeling modes such as highly localized pore-like voids in the bilayer and dispersed thinned membrane regions. Colocalization of distinct remodeling modes can be studied. Here we examine recent work in the field and outline methods used to achieve precise AFM image data. Experimental challenges and common pitfalls are discussed as well as techniques for unbiased analysis including the Hessian blob detection algorithm, bootstrapping, and the Bayesian information criterion. When coupled with robust statistical analyses, high precision AFM data is poised to advance understanding of an important family of peptides that cause poration of membrane bilayers.
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Affiliation(s)
- K G Schaefer
- Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - A E Pittman
- Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA
| | - F N Barrera
- Department of Biochemistry & Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA
| | - G M King
- Department of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211, USA; Department of Biochemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.
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5
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Rizvi A, Mulvey JT, Patterson JP. Observation of Liquid-Liquid-Phase Separation and Vesicle Spreading during Supported Bilayer Formation via Liquid-Phase Transmission Electron Microscopy. NANO LETTERS 2021; 21:10325-10332. [PMID: 34890211 DOI: 10.1021/acs.nanolett.1c03556] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Liquid-phase transmission electron microscopy (LP-TEM) enables the real-time visualization of nanoscale dynamics in solution. This technique has been used to study the formation and transformation mechanisms of organic and inorganic nanomaterials. Here, we study the formation of block-copolymer-supported bilayers using LP-TEM. We observe two formation pathways that involve either liquid droplets or vesicles as intermediates toward supported bilayers. Quantitative image analysis methods are used to characterize vesicle spread rates and show the origin of defect formation in supported bilayers. Our results suggest that bilayer assembly methods that proceed via liquid droplet intermediates should be beneficial for forming pristine supported bilayers. Furthermore, supported bilayers inside the liquid cells may be used to image membrane interactions with proteins and nanoparticles in the future.
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Affiliation(s)
- Aoon Rizvi
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Justin T Mulvey
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Joseph P Patterson
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, United States
- Department of Materials Science and Engineering, University of California, Irvine, Irvine, California 92697-2025, United States
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6
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Priest L, Peters JS, Kukura P. Scattering-based Light Microscopy: From Metal Nanoparticles to Single Proteins. Chem Rev 2021; 121:11937-11970. [PMID: 34587448 PMCID: PMC8517954 DOI: 10.1021/acs.chemrev.1c00271] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Indexed: 02/02/2023]
Abstract
Our ability to detect, image, and quantify nanoscopic objects and molecules with visible light has undergone dramatic improvements over the past few decades. While fluorescence has historically been the go-to contrast mechanism for ultrasensitive light microscopy due to its superior background suppression and specificity, recent developments based on light scattering have reached single-molecule sensitivity. They also have the advantages of universal applicability and the ability to obtain information about the species of interest beyond its presence and location. Many of the recent advances are driven by novel approaches to illumination, detection, and background suppression, all aimed at isolating and maximizing the signal of interest. Here, we review these developments grouped according to the basic principles used, namely darkfield imaging, interferometric detection, and surface plasmon resonance microscopy.
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Affiliation(s)
| | | | - Philipp Kukura
- Physical and Theoretical
Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QZ, United Kingdom
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7
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Chen HB, Jiang D, Zhou XL, Qian C, Yang Y, Liu XW. Tracking Interfacial Dynamics of a Single Nanoparticle Using Plasmonic Scattering Interferometry. Anal Chem 2020; 92:13327-13335. [PMID: 32794762 DOI: 10.1021/acs.analchem.0c02624] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The ability to track interfacial dynamics of a single nanoparticle at the solution-solid interface is crucial for understanding physical, chemical, and biological processes, but it remains a challenge. Here, we demonstrated a plasmonic imaging technique that can track unlabeled nanoparticles at the solution-solid interface with high spatial and temporal resolutions. This technique is based on particle-induced interferometric scattering of a surface plasmonic wave, which results in a high vertical sensitivity. Using this ability, we tracked the trajectories of a single nanoparticle interacting with a surface, measured the hydrodynamically hindered diffusion of nanoparticles, and revealed the surface chemistry-dependent behavior of nanoparticles at the interface. The application for tracking formation of membranes from a lipid vesicle was demonstrated, indicating the potential for investigating a broad range of nano-objects at interfaces in a complex environment.
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Affiliation(s)
- Hai-Bo Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Di Jiang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Xiao-Li Zhou
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Chen Qian
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Yunze Yang
- Center for Biosensors and Bioelectronics, Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
| | - Xian-Wei Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, China
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8
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Single-vesicle imaging reveals lipid-selective and stepwise membrane disruption by monomeric α-synuclein. Proc Natl Acad Sci U S A 2020; 117:14178-14186. [PMID: 32513706 PMCID: PMC7322013 DOI: 10.1073/pnas.1914670117] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Neurodegenerative diseases are increasing among the world's population, but there are no cures. These disorders all involve proteins that assemble into amyloid fibers which results in brain cell death. Evidence suggests that association of these proteins with lipid membranes is crucial for both functional and pathological roles. In Parkinson's disease, the involved protein, α-synuclein, is thought to function in trafficking of lipid vesicles in the brain. In search of mechanistic origins, increasing focus is put on identifying neurotoxic reactions induced by membrane interactions. To contribute new clues to this question, we here employed a new surface-sensitive scattering microscopy technique. With this approach, we discovered that α-synuclein perturbs vesicles in a stepwise and lipid-dependent fashion already at very low protein coverage. The interaction of the neuronal protein α-synuclein with lipid membranes appears crucial in the context of Parkinson’s disease, but the underlying mechanistic details, including the roles of different lipids in pathogenic protein aggregation and membrane disruption, remain elusive. Here, we used single-vesicle resolution fluorescence and label-free scattering microscopy to investigate the interaction kinetics of monomeric α-synuclein with surface-tethered vesicles composed of different negatively charged lipids. Supported by a theoretical model to account for structural changes in scattering properties of surface-tethered lipid vesicles, the data demonstrate stepwise vesicle disruption and asymmetric membrane deformation upon α-synuclein binding to phosphatidylglycerol vesicles at protein concentrations down to 10 nM (∼100 proteins per vesicle). In contrast, phosphatidylserine vesicles were only marginally affected. These insights into structural consequences of α-synuclein interaction with lipid vesicles highlight the contrasting roles of different anionic lipids, which may be of mechanistic relevance for both normal protein function (e.g., synaptic vesicle binding) and dysfunction (e.g., mitochondrial membrane interaction).
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9
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Shi Z, Huang J, Huang X, Huang Y, Wu L, Li Q. Resonant scattering enhanced interferometric scattering microscopy. NANOSCALE 2020; 12:7969-7975. [PMID: 32232255 DOI: 10.1039/c9nr10391k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Interferometric scattering (iSCAT) microscopy is a powerful tool for high-sensitive label-free imaging and sensing of nano-objects with high spatial-temporal resolution. The nano-objects imaged with the current iSCAT microscopy are usually non-resonant under laser light illumination and the iSCAT signal contrast is simply proportional to the volume and weight of the objects of interest. Here in this paper, we developed a novel strategy of resonant scattering enhanced iSCAT microscopy where the imaged nanoparticles are near resonant under laser light illumination, and we demonstrated it by using gold nanorods (NRs) with tunable longitudinal surface plasmon resonances. The obtained iSCAT signal contrast shows a dramatic variation in the narrow resonance wavelength range as small as 20 nm, and this is attributed to the strong wavelength dependence of the polarizability of gold NRs under optical resonance conditions. Different factors that have contributed to the iSCAT signal are theoretically analyzed and numerically simulated, providing the basic understanding about the effect of optical resonance on the iSCAT signal of nanoparticles. Our novel work provides a promising approach toward resonant sensing, imaging, and spectroscopy of nanoscopic objects.
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Affiliation(s)
- Zhonghong Shi
- Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China.
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10
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Supported Planar Single and Multiple Bilayer Formation by DOPC Vesicle Rupture on Mica Substrate: A Mechanism as Revealed by Atomic Force Microscopy Study. J Membr Biol 2020; 253:205-219. [DOI: 10.1007/s00232-020-00117-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 03/26/2020] [Indexed: 12/11/2022]
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11
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Matin TR, Utjesanovic M, Sigdel KP, Smith VF, Kosztin I, King GM. Characterizing the Locus of a Peripheral Membrane Protein-Lipid Bilayer Interaction Underlying Protein Export Activity in E. coli. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2143-2152. [PMID: 32011890 DOI: 10.1021/acs.langmuir.9b03606] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Quantitative characterization of the strength of peripheral membrane protein-lipid bilayer interactions is fundamental in the understanding of many protein targeting pathways. SecA is a peripheral membrane protein that plays a central role in translocating precursor proteins across the inner membrane of E. coli. The membrane binding activity of the extreme N-terminus of SecA is critical for translocase function. Yet, the mechanical strength of the interaction and the kinetic pathways that this segment of SecA experiences when in proximity of an E. coli polar lipid bilayer has not been characterized. We directly measured the N-terminal SecA-lipid bilayer interaction using precision single molecule atomic force microscope (AFM)-based dynamic force spectroscopy. To provide conformational data inaccessible to AFM, we also performed all-atom molecular dynamics simulations and circular dichroism measurements. The N-terminal 10 amino acids of SecA have little secondary structure when bound to zwitterionic lipid head groups, but secondary structure, which rigidifies the lipid-bound protein segment, emerges when negatively charged lipids are present. Analysis of the single molecule protein-lipid dissociation data converged to a well-defined lipid-bound-state lifetime in the absence of force, τ0lipid = 0.9 s, which is well separated from and longer than the fundamental time scale of the secretion process, defined as the time required to translocate a single amino acid residue (∼50 ms). This value of τ0lipid is likely to represent a lower limit of the in vivo membrane-bound lifetime due to factors including the minimal system employed here.
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Affiliation(s)
- Tina R Matin
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States
| | - Milica Utjesanovic
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States
| | - Krishna P Sigdel
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States
| | - Virginia F Smith
- Department of Chemistry, United States Naval Academy, Annapolis, Maryland 21402, United States
| | - Ioan Kosztin
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States
| | - Gavin M King
- Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, United States
- Department of Biochemistry, University of Missouri, Columbia, Missouri 65211, United States
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12
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Schäfer J, Nehls J, Schön M, Mey I, Steinem C. Leaflet-Dependent Distribution of PtdIns[4,5]P 2 in Supported Model Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1320-1328. [PMID: 31951413 DOI: 10.1021/acs.langmuir.9b03793] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Supported planar lipid bilayers (SLBs) prepared by spreading of unilamellar vesicles on hydrophilic substrates such as silicon dioxide are frequently used to investigate lipid-protein interactions by means of surface-sensitive methods. In recent years, the receptor lipid phosphatidylinositol-4,5-bisphosphate (PtdIns[4,5]P2) became particularly important as a significant number of proteins bind to this lipid at the inner leaflet of the plasma membrane. Here, we investigated how the lipid PtdIns[4,5]P2 distributes between the two leaflets of an SLB on SiO2 surfaces. We prepared SLBs on SiO2 by spreading small unilamellar vesicles and quantified the adsorption of PtdIns[4,5]P2 binding proteins providing information about the accessibility of PtdIns[4,5]P2. We compared protein binding to PtdIns[4,5]P2 in SLBs with that in lipid monolayers on a 1,1,1-trimethyl-N-(trimethylsilyl)silanamine-functionalized SiO2 surface using reflectometric interference spectroscopy and atomic force microscopy. Our results clearly demonstrate that the accessibility of PtdIns[4,5]P2 for protein binding is reduced in SLBs compared to that in supported hybrid membranes, which is discussed in terms of PtdIns[4,5]P2 distribution in the two leaflets of SLBs.
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Affiliation(s)
- Jonas Schäfer
- Institute of Organic and Biomolecular Chemistry , University of Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Jessica Nehls
- Institute of Organic and Biomolecular Chemistry , University of Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Markus Schön
- Institute of Organic and Biomolecular Chemistry , University of Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Ingo Mey
- Institute of Organic and Biomolecular Chemistry , University of Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
| | - Claudia Steinem
- Institute of Organic and Biomolecular Chemistry , University of Göttingen , Tammannstrasse 2 , 37077 Göttingen , Germany
- Max Planck Institute for Dynamics and Self-Organization , Am Fassberg 17 , 37077 Göttingen , Germany
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13
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Quantitative accounting of dye leakage and photobleaching in single lipid vesicle measurements: Implications for biomacromolecular interaction analysis. Colloids Surf B Biointerfaces 2019; 182:110338. [DOI: 10.1016/j.colsurfb.2019.06.067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 06/08/2019] [Accepted: 06/28/2019] [Indexed: 02/05/2023]
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14
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Taylor R, Sandoghdar V. Interferometric Scattering Microscopy: Seeing Single Nanoparticles and Molecules via Rayleigh Scattering. NANO LETTERS 2019; 19:4827-4835. [PMID: 31314539 PMCID: PMC6750867 DOI: 10.1021/acs.nanolett.9b01822] [Citation(s) in RCA: 95] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 07/06/2019] [Indexed: 05/04/2023]
Abstract
Fluorescence microscopy has been the workhorse for investigating optical phenomena at the nanometer scale but this approach confronts several fundamental limits. As a result, there have been a growing number of activities toward the development of fluorescent-free imaging methods. In this Mini Review, we demonstrate that elastic scattering, the most ubiquitous and oldest optical contrast mechanism, offers excellent opportunities for sensitive detection and imaging of nanoparticles and molecules at very high spatiotemporal resolution. We present interferometric scattering (iSCAT) microscopy as the method of choice, explain its theoretical foundation, discuss its experimental nuances, elaborate on its deep connection to bright-field imaging and other established microscopies, and discuss its promise as well as challenges. A showcase of numerous applications and avenues made possible by iSCAT demonstrates its rapidly growing impact on various disciplines concerned with nanoscopic phenomena.
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Affiliation(s)
- Richard
W. Taylor
- Max Planck Institute
for
the Science of Light and Max-Planck-Zentrum für Physik und
Medizin, 91058 Erlangen, Germany
| | - Vahid Sandoghdar
- Max Planck Institute
for
the Science of Light and Max-Planck-Zentrum für Physik und
Medizin, 91058 Erlangen, Germany
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15
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Park S, Jackman JA, Xu X, Weiss PS, Cho NJ. Micropatterned Viral Membrane Clusters for Antiviral Drug Evaluation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:13984-13990. [PMID: 30855935 DOI: 10.1021/acsami.9b01724] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The function of biological nanoparticles, such as membrane-enveloped viral particles, is often enhanced when the particles form higher-order supramolecular assemblies. While there is intense interest in developing biomimetic platforms that recapitulate these collective properties, existing platforms are limited to mimicking individual virus particles. Here, we present a micropatterning strategy to print linker molecules selectively onto bioinert surfaces, thereby enabling controlled tethering of biomimetic viral particle clusters across defined geometric patterns. By controlling the linker concentration, it is possible to tune the density of tethered particles within clusters while enhancing the signal intensity of encapsulated fluorescent markers. Time-resolved tracking of pore formation and membrane lysis revealed that an antiviral peptide can disturb clusters of the membrane-enclosed particles akin to the targeting of individual viral particles. This platform is broadly useful for evaluating the performance of membrane-active antiviral drug candidates, whereas the micropatterning strategy can be applied to a wide range of biological nanoparticles and other macromolecular entities.
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Affiliation(s)
- Soohyun Park
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Drive , Singapore 637553 , Singapore
| | | | - Xiaobin Xu
- California NanoSystems Institute, Department of Chemistry and Biochemistry, and Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095-7227 , United States
- School of Materials Science and Engineering , Tongji University , 1239 Siping Road , Shanghai 200092 , China
| | - Paul S Weiss
- California NanoSystems Institute, Department of Chemistry and Biochemistry, and Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095-7227 , United States
| | - Nam-Joon Cho
- School of Materials Science and Engineering , Nanyang Technological University , 50 Nanyang Drive , Singapore 637553 , Singapore
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62 Nanyang Drive , Singapore 637459 , Singapore
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16
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Abstract
Interferometric scattering microscopy (iSCAT) is an extremely sensitive imaging method based on the efficient detection of light scattered by nanoscopic objects. The ability to, at least in principle, maintain high imaging contrast independent of the exposure time or the scattering cross section of the object allows for unique applications in single-particle tracking, label-free imaging of nanoscopic (dis)assembly, and quantitative single-molecule characterization. We illustrate these capabilities in areas as diverse as mechanistic studies of motor protein function, viral capsid assembly, and single-molecule mass measurement in solution. We anticipate that iSCAT will become a widely used approach to unravel previously hidden details of biomolecular dynamics and interactions.
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Affiliation(s)
- Gavin Young
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QZ, United Kingdom; ,
| | - Philipp Kukura
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford OX1 3QZ, United Kingdom; ,
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17
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Croop B, Zhang C, Lim Y, Gelfand RM, Han KY. Recent advancement of light-based single-molecule approaches for studying biomolecules. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2019; 11:e1445. [PMID: 30724484 DOI: 10.1002/wsbm.1445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 12/01/2018] [Accepted: 01/08/2019] [Indexed: 12/27/2022]
Abstract
Recent advances in single-molecule techniques have led to new discoveries in analytical chemistry, biophysics, and medicine. Understanding the structure and behavior of single biomolecules provides a wealth of information compared to studying large ensembles. However, developing single-molecule techniques is challenging and requires advances in optics, engineering, biology, and chemistry. In this paper, we will review the state of the art in single-molecule applications with a focus over the last few years of development. The advancements covered will mainly include light-based in vitro methods, and we will discuss the fundamentals of each with a focus on the platforms themselves. We will also summarize their limitations and current and future applications to the wider biological and chemical fields. This article is categorized under: Laboratory Methods and Technologies > Imaging Laboratory Methods and Technologies > Macromolecular Interactions, Methods Analytical and Computational Methods > Analytical Methods.
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Affiliation(s)
- Benjamin Croop
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida
| | - Chenyi Zhang
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida
| | - Youngbin Lim
- Department of Bioengineering, Stanford University, Stanford, California
| | - Ryan M Gelfand
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida
| | - Kyu Young Han
- CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida
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18
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Wu X, Zhao Z, Kang Y, Ji X, Liu Y. Viscoelasticity of poly(ethylene glycol) in aqueous solutions of potassium sulfate: a comparison of quartz crystal microbalance with conventional methods. Polym J 2019. [DOI: 10.1038/s41428-018-0162-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Mapar M, Jõemetsa S, Pace H, Zhdanov VP, Agnarsson B, Höök F. Spatiotemporal Kinetics of Supported Lipid Bilayer Formation on Glass via Vesicle Adsorption and Rupture. J Phys Chem Lett 2018; 9:5143-5149. [PMID: 30137991 DOI: 10.1021/acs.jpclett.8b02092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Supported lipid bilayers (SLBs) represent one of the most popular mimics of the cell membrane. Herein, we have used total internal reflection fluorescence microscopy for in-depth characterization of the vesicle-mediated SLB formation mechanism on a common silica-rich substrate, borosilicate glass. Fluorescently labeling a subset of vesicles allowed us to monitor the adsorption of individual labeled vesicles, resolve the onset of SLB formation from small seeds of SLB patches, and track their growth via SLB-edge-induced autocatalytic rupture of adsorbed vesicles. This made it possible to perform the first quantitative measurement of the SLB front velocity, which is shown to increase up to 1 order of magnitude with time. This effect can be classified as dramatic because in many other physical, chemical, or biological kinetic processes the front velocity is either constant or decreasing with time. The observation was successfully described with a theoretical model and Monte Carlo simulations implying rapid local diffusion of lipids upon vesicle rupture.
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Affiliation(s)
- Mokhtar Mapar
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
| | - Silver Jõemetsa
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
| | - Hudson Pace
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
| | - Vladimir P Zhdanov
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
- Boreskov Institute of Catalysis , Russian Academy of Sciences , Novosibirsk 630090 , Russia
| | - Björn Agnarsson
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
| | - Fredrik Höök
- Division of Biological Physics, Department of Physics , Chalmers University of Technology , 41296 Göteborg , Sweden
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20
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Kim M, Vala M, Ertsgaard CT, Oh SH, Lodge TP, Bates FS, Hackel BJ. Surface Plasmon Resonance Study of the Binding of PEO-PPO-PEO Triblock Copolymer and PEO Homopolymer to Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:6703-6712. [PMID: 29787676 PMCID: PMC6055929 DOI: 10.1021/acs.langmuir.8b00873] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Poloxamer 188 (P188), a poly(ethylene oxide)- b-poly(propylene oxide)- b-poly(ethylene oxide) triblock copolymer, protects cell membranes against various external stresses, whereas poly(ethylene oxide) (PEO; 8600 g/mol) homopolymer lacks protection efficacy. As part of a comprehensive effort to elucidate the protection mechanism, we used surface plasmon resonance (SPR) to obtain direct evidence of binding of the polymers onto supported lipid bilayers. Binding kinetics and coverage of P188 and PEO were examined and compared. Most notably, PEO exhibited membrane association comparable to that of P188, evidenced by comparable association rate constants and coverage. This result highlights the need for additional mechanistic understanding beyond simple membrane association to explain the differential efficacy of P188 in therapeutic applications.
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21
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Jackman JA, Rahim Ferhan A, Cho NJ. Nanoplasmonic sensors for biointerfacial science. Chem Soc Rev 2018; 46:3615-3660. [PMID: 28383083 DOI: 10.1039/c6cs00494f] [Citation(s) in RCA: 130] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In recent years, nanoplasmonic sensors have become widely used for the label-free detection of biomolecules across medical, biotechnology, and environmental science applications. To date, many nanoplasmonic sensing strategies have been developed with outstanding measurement capabilities, enabling detection down to the single-molecule level. One of the most promising directions has been surface-based nanoplasmonic sensors, and the potential of such technologies is still emerging. Going beyond detection, surface-based nanoplasmonic sensors open the door to enhanced, quantitative measurement capabilities across the biointerfacial sciences by taking advantage of high surface sensitivity that pairs well with the size of medically important biomacromolecules and biological particulates such as viruses and exosomes. The goal of this review is to introduce the latest advances in nanoplasmonic sensors for the biointerfacial sciences, including ongoing development of nanoparticle and nanohole arrays for exploring different classes of biomacromolecules interacting at solid-liquid interfaces. The measurement principles for nanoplasmonic sensors based on utilizing the localized surface plasmon resonance (LSPR) and extraordinary optical transmission (EOT) phenomena are first introduced. The following sections are then categorized around different themes within the biointerfacial sciences, specifically protein binding and conformational changes, lipid membrane fabrication, membrane-protein interactions, exosome and virus detection and analysis, and probing nucleic acid conformations and binding interactions. Across these themes, we discuss the growing trend to utilize nanoplasmonic sensors for advanced measurement capabilities, including positional sensing, biomacromolecular conformation analysis, and real-time kinetic monitoring of complex biological interactions. Altogether, these advances highlight the rich potential of nanoplasmonic sensors and the future growth prospects of the community as a whole. With ongoing development of commercial nanoplasmonic sensors and analytical models to interpret corresponding measurement data in the context of biologically relevant interactions, there is significant opportunity to utilize nanoplasmonic sensing strategies for not only fundamental biointerfacial science, but also translational science applications related to clinical medicine and pharmaceutical drug development among countless possibilities.
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Affiliation(s)
- Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
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22
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Lv Z, Banerjee S, Zagorski K, Lyubchenko YL. Supported Lipid Bilayers for Atomic Force Microscopy Studies. Methods Mol Biol 2018; 1814:129-143. [PMID: 29956230 PMCID: PMC6045422 DOI: 10.1007/978-1-4939-8591-3_8] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Nanoimaging methods, atomic force microscopy (AFM) in particular, are widely used to study the interaction of biological molecules with the supported lipid bilayer (SLB), which itself is a traditional model for cellular membranes. Success in these studies is based on the availability of a stable SLB for the required observation period, which can extend several hours. The application of AFM requires that the SLB have a smooth morphology, thus enabling visualization of proteins and other molecules on its surface. Herein, we describe protocols for SLB assembly by using 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-L-serine (POPS) on a mica support. Our methodology enables us to assemble defect-free POPC and POPS SLBs that remain stable for at least 8 h. The application of such smooth and stable surfaces is illustrated by monitoring of the on-surface aggregation of amyloid proteins with the use of time-lapse AFM.
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Affiliation(s)
- Zhengjian Lv
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
- Bruker Nano Surfaces Division, Santa Barbara, CA, USA
| | - Siddhartha Banerjee
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Karen Zagorski
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Yuri L Lyubchenko
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA.
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23
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Olenick LL, Chase HM, Fu L, Zhang Y, McGeachy AC, Dogangun M, Walter SR, Wang HF, Geiger FM. Single-component supported lipid bilayers probed using broadband nonlinear optics. Phys Chem Chem Phys 2018; 20:3063-3072. [DOI: 10.1039/c7cp02549a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Broadband SFG spectroscopy is shown to offer considerable advantages over scanning systems in terms of signal-to-noise ratios when probing well-formed single-component supported lipid bilayers formed from zwitterionic lipids with PC headgroups.
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Affiliation(s)
| | | | - Li Fu
- William R. Wiley Environmental Molecular Sciences Laboratory
- Pacific Northwest National Laboratory
- Richland
- USA
- Sanofi-Genzyme
| | - Yun Zhang
- William R. Wiley Environmental Molecular Sciences Laboratory
- Pacific Northwest National Laboratory
- Richland
- USA
- Institute of Optics and Electronics
| | | | - Merve Dogangun
- Department of Chemistry
- Northwestern University
- Evanston
- USA
| | | | - Hong-fei Wang
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
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24
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Koutsioubas A, Appavou MS, Lairez D. Time-Resolved Neutron Reflectivity during Supported Membrane Formation by Vesicle Fusion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10598-10605. [PMID: 28872877 DOI: 10.1021/acs.langmuir.7b02459] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The formation of supported lipid bilayers (SLB) on hydrophilic substrates through the method of unilamelar vesicle fusion is used routinely in a wide range of biophysical studies. In an effort to control and better understand the fusion process on the substrate, many experimental studies employing different techniques have been devoted to the elucidation of the fusion mechanism. In the present work, we follow the kinetics of membrane formation using time-resolved (TR) neutron reflectivity, focusing on the structural changes near the solid/liquid interface. A clear indication of stacked bilayer structure is observed during the intermediate phase of SLB formation. Adsorbed lipid mass decrease is also measured in the final stage of the process. We have found that it is essential for the analysis of the experimental results to treat the shape of adsorbed lipid vesicles on an attractive substrate theoretically. The overall findings are discussed in relation to proposed fusion mechanisms from the literature, and we argue that our observations favor a model involving enhanced adhesion of incoming vesicles on the edges of already-formed bilayer patches.
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Affiliation(s)
- Alexandros Koutsioubas
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Marie-Sousai Appavou
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Didier Lairez
- Laboratoire des Solides Irradiés, École Polytechnique, CNRS, CEA, Université Paris-Saclay , 91128 Palaiseau cedex, France
- Laboratoire Léon Brillouin, CNRS, CEA, Université Paris-Saclay , 91191 Gif-sur-Yvette cedex, France
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25
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Pantelopulos GA, Nagai T, Bandara A, Panahi A, Straub JE. Critical size dependence of domain formation observed in coarse-grained simulations of bilayers composed of ternary lipid mixtures. J Chem Phys 2017; 147:095101. [PMID: 28886648 PMCID: PMC5648569 DOI: 10.1063/1.4999709] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 07/19/2017] [Indexed: 12/13/2022] Open
Abstract
Model cellular membranes are known to form micro- and macroscale lipid domains dependent on molecular composition. The formation of macroscopic lipid domains by lipid mixtures has been the subject of many simulation investigations. We present a critical study of system size impact on lipid domain phase separation into liquid-ordered and liquid-disordered macroscale domains in ternary lipid mixtures. In the popular di-C16:0 PC:di-C18:2 PC:cholesterol at 35:35:30 ratio mixture, we find systems with a minimum of 1480 lipids to be necessary for the formation of macroscopic phase separated domains and systems of 10 000 lipids to achieve structurally converged conformations similar to the thermodynamic limit. To understand these results and predict the behavior of any mixture forming two phases, we develop and investigate an analytical Flory-Huggins model which is recursively validated using simulation and experimental data. We find that micro- and macroscale domains can coexist in ternary mixtures. Additionally, we analyze the distributions of specific lipid-lipid interactions in each phase, characterizing domain structures proposed based on past experimental studies. These findings offer guidance in selecting appropriate system sizes for the study of phase separations and provide new insights into the nature of domain structure for a popular ternary lipid mixture.
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Affiliation(s)
- George A Pantelopulos
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
| | - Tetsuro Nagai
- Department of Physics, Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Asanga Bandara
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
| | - Afra Panahi
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
| | - John E Straub
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
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26
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Thermal Response Analysis of Phospholipid Bilayers Using Ellipsometric Techniques. BIOSENSORS-BASEL 2017; 7:bios7030034. [PMID: 28820461 PMCID: PMC5618040 DOI: 10.3390/bios7030034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 08/15/2017] [Accepted: 08/16/2017] [Indexed: 12/29/2022]
Abstract
Biomimetic planar artificial membranes have been widely studied due to their multiple applications in several research fields. Their humectation and thermal response are crucial for reaching stability; these characteristics are related to the molecular organization inside the bilayer, which is affected by the aliphatic chain length, saturations, and molecule polarity, among others. Bilayer stability becomes a fundamental factor when technological devices are developed—like biosensors—based on those systems. Thermal studies were performed for different types of phosphatidylcholine (PC) molecules: two pure PC bilayers and four binary PC mixtures. These analyses were carried out through the detection of slight changes in their optical and structural parameters via Ellipsometry and Surface Plasmon Resonance (SPR) techniques. Phospholipid bilayers were prepared by Langmuir-Blodgett technique and deposited over a hydrophilic silicon wafer. Their molecular inclination degree, mobility, and stability of the different phases were detected and analyzed through bilayer thickness changes and their optical phase-amplitude response. Results show that certain binary lipid mixtures—with differences in its aliphatic chain length—present a co-existence of two thermal responses due to non-ideal mixing.
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27
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Jackman JA, Yorulmaz Avsar S, Ferhan AR, Li D, Park JH, Zhdanov VP, Cho NJ. Quantitative Profiling of Nanoscale Liposome Deformation by a Localized Surface Plasmon Resonance Sensor. Anal Chem 2016; 89:1102-1109. [PMID: 27983791 DOI: 10.1021/acs.analchem.6b02532] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Characterizing the shape of sub-100 nm, biological soft-matter particulates (e.g., liposomes and exosomes) adsorbed at a solid-liquid interface remains a challenging task. Here, we introduce a localized surface plasmon resonance (LSPR) sensing approach to quantitatively profile the deformation of nanoscale, fluid-phase 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) liposomes contacting a titanium dioxide substrate. Experimental and theoretical results validate that, due to its high sensitivity to the spatial proximity of phospholipid molecules near the sensor surface, the LSPR sensor can discriminate fine differences in the extent of ionic strength-modulated liposome deformation at both low and high surface coverages. By contrast, quartz crystal microbalance-dissipation (QCM-D) measurements performed with equivalent samples were qualitatively sensitive to liposome deformation only at saturation coverage. Control experiments with stiffer, gel-phase 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes verified that the LSPR measurement discrimination arises from the extent of liposome deformation, while the QCM-D measurements yield a more complex response that is also sensitive to the motion of adsorbed liposomes and coupled solvent along with lateral interactions between liposomes. Collectively, our findings demonstrate the unique measurement capabilities of LSPR sensors in the area of biological surface science, including competitive advantages for probing the shape properties of adsorbed, nanoscale biological particulates.
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Affiliation(s)
- Joshua A Jackman
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Saziye Yorulmaz Avsar
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Danlin Li
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Jae Hyeon Park
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Vladimir P Zhdanov
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore.,Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Nam-Joon Cho
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore.,School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive, 637459, Singapore
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28
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Agnarsson B, Wayment-Steele HK, Höök F, Kunze A. Monitoring of single and double lipid membrane formation with high spatiotemporal resolution using evanescent light scattering microscopy. NANOSCALE 2016; 8:19219-19223. [PMID: 27845799 DOI: 10.1039/c6nr06726c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Formation and quality of single solid supported lipid membranes and double lipid membranes were investigated with single vesicle resolution using label-free evanescence light scattering microscopy (EvSM). For the formation of double lipid membranes we made use of electrostatic interaction between charged lipids and oppositely charged cations.
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Affiliation(s)
- B Agnarsson
- Dept of Appl. Physics, Chalmers University of Technology, Göteborg, Sweden.
| | | | - F Höök
- Dept of Appl. Physics, Chalmers University of Technology, Göteborg, Sweden.
| | - A Kunze
- Dept of Appl. Physics, Chalmers University of Technology, Göteborg, Sweden. and Inst of Physical Chemistry, University of Göttingen, Göttingen, Germany
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29
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Rupert DLM, Shelke GV, Emilsson G, Claudio V, Block S, Lässer C, Dahlin A, Lötvall JO, Bally M, Zhdanov VP, Höök F. Dual-Wavelength Surface Plasmon Resonance for Determining the Size and Concentration of Sub-Populations of Extracellular Vesicles. Anal Chem 2016; 88:9980-9988. [PMID: 27644331 DOI: 10.1021/acs.analchem.6b01860] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Accurate concentration determination of subpopulations of extracellular vesicles (EVs), such as exosomes, is of importance both in the context of understanding their fundamental biological role and of potentially using them as disease biomarkers. In principle, this can be achieved by measuring the rate of diffusion-limited mass uptake to a sensor surface modified with a receptor designed to only bind the subpopulation of interest. However, a significant error is introduced if the targeted EV subpopulation has a size, and thus hydrodynamic diffusion coefficient, that differs from the mean size and diffusion coefficient of the whole EV population and/or if the EVs become deformed upon binding to the surface. We here demonstrate a new approach to determine the mean size (or effective film thickness) of bound nanoparticles, in general, and EV subpopulation carrying a marker of interest, in particular. The method is based on operating surface plasmon resonance simultaneously at two wavelengths with different sensing depths and using the ratio of the corresponding responses to extract the particle size on the surface. By estimating in this way the degree of deformation of adsorbed EVs, we markedly improved their bulk concentration determination and showed that EVs carrying the exosomal marker CD63 correspond to not more than around 10% of the EV sample.
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Affiliation(s)
- Deborah L M Rupert
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Ganesh V Shelke
- Krefting Research Centre, Department of Internal Medicine and Clinical Nutrition, University of Gothenburg , SE-405 30 Gothenburg, Sweden
| | - Gustav Emilsson
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Virginia Claudio
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Stephan Block
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Cecilia Lässer
- Krefting Research Centre, Department of Internal Medicine and Clinical Nutrition, University of Gothenburg , SE-405 30 Gothenburg, Sweden
| | - Andreas Dahlin
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Jan O Lötvall
- Krefting Research Centre, Department of Internal Medicine and Clinical Nutrition, University of Gothenburg , SE-405 30 Gothenburg, Sweden
| | - Marta Bally
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden.,Institut Curie, Centre de Recherche, CNRS, UMR 168, Physico-Chimie Curie, F-75248 Paris, France
| | - Vladimir P Zhdanov
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden.,Boreskov Institute of Catalysis, Russian Academy of Sciences , 630090 Novosibirsk, Russia
| | - Fredrik Höök
- Department of Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
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30
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Visualization of the spontaneous emergence of a complex, dynamic, and autocatalytic system. Proc Natl Acad Sci U S A 2016; 113:11122-11126. [PMID: 27638200 DOI: 10.1073/pnas.1602363113] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Autocatalytic chemical reactions are widely studied as models of biological processes and to better understand the origins of life on Earth. Minimal self-reproducing amphiphiles have been developed in this context and as an approach to de novo "bottom-up" synthetic protocells. How chemicals come together to produce living systems, however, remains poorly understood, despite much experimentation and speculation. Here, we use ultrasensitive label-free optical microscopy to visualize the spontaneous emergence of an autocatalytic system from an aqueous mixture of two chemicals. Quantitative, in situ nanoscale imaging reveals heterogeneous self-reproducing aggregates and enables the real-time visualization of the synthesis of new aggregates at the reactive interface. The aggregates and reactivity patterns observed vary together with differences in the respective environment. This work demonstrates how imaging of chemistry at the nanoscale can provide direct insight into the dynamic evolution of nonequilibrium systems across molecular to microscopic length scales.
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31
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Dacic M, Jackman JA, Yorulmaz S, Zhdanov VP, Kasemo B, Cho NJ. Influence of Divalent Cations on Deformation and Rupture of Adsorbed Lipid Vesicles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6486-95. [PMID: 27182843 DOI: 10.1021/acs.langmuir.6b00439] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The fate of adsorbed lipid vesicles on solid supports depends on numerous experimental parameters and typically results in the formation of a supported lipid bilayer (SLB) or an adsorbed vesicle layer. One of the poorly understood questions relates to how divalent cations appear to promote SLB formation in some cases. The complexity arises from the multiple ways in which divalent cations affect vesicle-substrate and vesicle-vesicle interactions as well as vesicle properties. These interactions are reflected, e.g., in the degree of deformation of adsorbed vesicles (if they do not rupture). It is, however, experimentally challenging to measure the extent of vesicle deformation in real-time. Herein, we investigated the effect of divalent cations (Mg(2+), Ca(2+), Sr(2+)) on the adsorption of zwitterionic 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid vesicles onto silicon oxide- and titanium oxide-coated substrates. The vesicle adsorption process was tracked using the quartz crystal microbalance-dissipation (QCM-D) and localized surface plasmon resonance (LSPR) measurement techniques. On silicon oxide, vesicle adsorption led to SLB formation in all cases, while vesicles adsorbed but did not rupture on titanium oxide. It was identified that divalent cations promote increased deformation of adsorbed vesicles on both substrates and enhanced rupture on silicon oxide in the order Ca(2+) > Mg(2+) > Sr(2+). The influence of divalent cations on different factors in these systems is discussed, clarifying experimental observations on both substrates. Taken together, the findings in this work offer insight into how divalent cations modulate the interfacial science of supported membrane systems.
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Affiliation(s)
- Marija Dacic
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Joshua A Jackman
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Saziye Yorulmaz
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
| | - Vladimir P Zhdanov
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
- Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Bengt Kasemo
- Department of Physics, Chalmers University of Technology , 41296 Göteborg, Sweden
| | - Nam-Joon Cho
- School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue 639798, Singapore
- Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive 637553, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive 637459, Singapore
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Ortega Arroyo J, Cole D, Kukura P. Interferometric scattering microscopy and its combination with single-molecule fluorescence imaging. Nat Protoc 2016; 11:617-33. [DOI: 10.1038/nprot.2016.022] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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33
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González-Henríquez C, Pizarro-Guerra G, Córdova-Alarcón E, Sarabia-Vallejos M, Terraza-Inostroza C. Artificial biomembranes stabilized over spin coated hydrogel scaffolds. Crosslinking agent nature induces wrinkled or flat surfaces on the hydrogel. Chem Phys Lipids 2016; 196:13-23. [DOI: 10.1016/j.chemphyslip.2016.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/13/2016] [Accepted: 02/02/2016] [Indexed: 12/19/2022]
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Jackman JA, Špačková B, Linardy E, Kim MC, Yoon BK, Homola J, Cho NJ. Nanoplasmonic ruler to measure lipid vesicle deformation. Chem Commun (Camb) 2016; 52:76-9. [DOI: 10.1039/c5cc06861d] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A nanoplasmonic ruler measures vesicle deformation and provides direct evidence to support membrane tension-based models of vesicle adsorption and rupture.
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Affiliation(s)
- Joshua A. Jackman
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science
- Nanyang Technological University
- Singapore
| | - Barbora Špačková
- Institute of Photonics and Electronics
- Academy of Science of the Czech Republic
- Prague 8 18251
- Czech Republic
| | - Eric Linardy
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science
- Nanyang Technological University
- Singapore
| | - Min Chul Kim
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science
- Nanyang Technological University
- Singapore
| | - Bo Kyeong Yoon
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science
- Nanyang Technological University
- Singapore
| | - Jiří Homola
- Institute of Photonics and Electronics
- Academy of Science of the Czech Republic
- Prague 8 18251
- Czech Republic
| | - Nam-Joon Cho
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science
- Nanyang Technological University
- Singapore
- School of Chemical and Biomedical Engineering
- Nanyang Technological University
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35
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Agnarsson B, Lundgren A, Gunnarsson A, Rabe M, Kunze A, Mapar M, Simonsson L, Bally M, Zhdanov VP, Höök F. Evanescent Light-Scattering Microscopy for Label-Free Interfacial Imaging: From Single Sub-100 nm Vesicles to Live Cells. ACS NANO 2015; 9:11849-11862. [PMID: 26517791 DOI: 10.1021/acsnano.5b04168] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Advancement in the understanding of biomolecular interactions has benefited greatly from the development of surface-sensitive bioanalytical sensors. To further increase their broad impact, significant efforts are presently being made to enable label-free and specific biomolecule detection with high sensitivity, allowing for quantitative interpretation and general applicability at low cost. In this work, we have addressed this challenge by developing a waveguide chip consisting of a flat silica core embedded in a symmetric organic cladding with a refractive index matching that of water. This is shown to reduce stray light (background) scattering and thereby allow for label-free detection of faint objects, such as individual sub-20 nm gold nanoparticles as well as sub-100 nm lipid vesicles. Measurements and theoretical analysis revealed that light-scattering signals originating from single surface-bound lipid vesicles enable characterization of their sizes without employing fluorescent lipids as labels. The concept is also demonstrated for label-free measurements of protein binding to and enzymatic (phospholipase A2) digestion of individual lipid vesicles, enabling an analysis of the influence on the measured kinetics of the dye-labeling of lipids required in previous assays. Further, diffraction-limited imaging of cells (platelets) binding to a silica surface showed that distinct subcellular features could be visualized and temporally resolved during attachment, activation, and spreading. Taken together, these results underscore the versatility and general applicability of the method, which due to its simplicity and compatibility with conventional microscopy setups may reach a widespread in life science and beyond.
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Affiliation(s)
- Björn Agnarsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Anders Lundgren
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Anders Gunnarsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Michael Rabe
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Angelika Kunze
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
- Institute of Physical Chemistry, University of Göttingen , D-37077 Göttingen, Germany
| | - Mokhtar Mapar
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Lisa Simonsson
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Marta Bally
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
| | - Vladimir P Zhdanov
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
- Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Fredrik Höök
- Division of Biological Physics, Department of Applied Physics, Chalmers University of Technology , SE-41296 Göteborg, Sweden
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Pawłowski J, Juhaniewicz J, Güzeloğlu A, Sęk S. Mechanism of Lipid Vesicles Spreading and Bilayer Formation on a Au(111) Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11012-9. [PMID: 26010469 DOI: 10.1021/acs.langmuir.5b01331] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Spreading of small unilamellar vesicles on solid surfaces is one of the most common ways to obtain supported lipid bilayers. Although the method has been used successfully for many years, the details of this process are still the subject of intense debate. Particularly controversial is the mechanism of bilayer formation on metallic surfaces like gold. In this work, we have employed scanning probe microscopy techniques to evaluate the details of lipid vesicles spreading and formation of the lipid bilayer on a Au(111) surface in a phosphate-buffered saline solution. Nanoscale imaging revealed that the mechanism of this process differs significantly from that usually assumed for hydrophilic surfaces such as mica, glass, and silicon oxide. Formation of the bilayer on gold involves several steps. Initially, the vesicles accumulate on a gold surface and release lipid molecules that adsorb on a Au(111) surface, giving rise to the appearance of highly ordered stripelike domains. The latter serve as a template for the buildup of a hemimicellar film, which contributes to the increased hydrophilicity of the external surface and facilitates further adsorption and rupture of the vesicles. As a result, the bilayer is spread over a hemimicellar film, and then it is followed by slow fusion between coupled layers leading to formation of a single bilayer supported on a gold surface. We believe that the results presented in this work may provide some new insights into the area of research related to supported lipid bilayers.
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Affiliation(s)
- Jan Pawłowski
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Joanna Juhaniewicz
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Alişan Güzeloğlu
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Sławomir Sęk
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw , Żwirki i Wigury 101, 02-089 Warsaw, Poland
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Artificial biomembrane based on DPPC — Investigation into phase transition and thermal behavior through ellipsometric techniques. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:2295-307. [DOI: 10.1016/j.bbamem.2015.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 07/01/2015] [Accepted: 07/02/2015] [Indexed: 12/12/2022]
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Peel MJ, Cross SJ, Birkholz O, Aladağ A, Piehler J, Peel S. Rupture of Stochastically Occurring Vesicle Clusters Limits Bilayer Formation on Alkane-PEG-Type Supports: Uncoupling Clustering from Surface Coverage. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:8830-40. [PMID: 26176185 DOI: 10.1021/acs.langmuir.5b00925] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Polymer-supported bilayers (PSBs) are a recognized tool for drug discovery through function-interaction analysis of membrane proteins. While silica-supported bilayers (SSBs) spontaneously form from surface-adsorbed vesicles, successful PSB formation via a similar method has thus far been limited by an insufficient understanding of the underlying vesicle-remodelling processes. Here, we generated a polymer support through the incubation of poly-L-lysine conjugated to alkyl-chain-terminated poly(ethylene)glycol on silica. This polymer-coated silica substrate yielded efficient vesicle adsorption and spontaneous bilayer formation, thereby providing a rare opportunity to address the mechanism of PSB formation and compare it to that of SSB. The combined use of super-resolution imaging, kinetics, and simulations indicates that the rupture of stochastically formed vesicle clusters is the rate-limiting step, which is an order of magnitude higher for silica than for polymer-coated silica. This was confirmed by directly demonstrating increased rupture rates for surface adsorbed multivesicle assemblies formed by vesicle cross-linking in solution. On the basis of this key insight we surmised that a low propensity of cluster rupture can be compensated for by an increase in the number density of clusters: the deposition of a mixture of oppositely charged vesicles resulted in bilayer formation on another alkane-PEG type of interface, which despite efficient vesicle adsorption otherwise fails to support spontaneous bilayer formation. This potentially provides a universal strategy for promoting bilayer formation on resistant surfaces without resorting to modifying the surface itself. Therefore, multivesicle assemblies with tailored geometries not only could facilitate bilayer formation on polymers with interesting functional properties but also could instigate the exploration of vesicle architecture for other processes involving vesicle remodelling such as drug delivery.
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Affiliation(s)
| | | | - Oliver Birkholz
- §Department of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | | | - Jacob Piehler
- §Department of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
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Zhang L, Christensen SM, Bendix PM, Bhatia VK, Loft S, Stamou D. Interferometric Detection of Single Gold Nanoparticles Calibrated against TEM Size Distributions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:3550-3555. [PMID: 25824101 DOI: 10.1002/smll.201403498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 03/02/2015] [Indexed: 06/04/2023]
Abstract
Single nanoparticle analysis: An interferometric optical approach calibrates sizes of gold nanoparticles (AuNPs) from the interference intensities by calibrating their interferometric signals against the corresponding transmission electron microscopy measurements. This method is used to investigate whether size affects the diffusion behavior of AuNPs conjugated to supported lipid bilayer membranes and to multiplex the simultaneous detection of three different AuNP labels.
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Affiliation(s)
- Lixue Zhang
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Sune M Christensen
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Poul Martin Bendix
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Vikram Kjøller Bhatia
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Steffen Loft
- Institute of Public Health Department of Environmental Health, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Dimitrios Stamou
- Bio-Nanotechnology Laboratory, Department of Chemistry Nano-Science Center, Lundbeck Foundation Center Biomembranes in Nanomedicine, University of Copenhagen, 2100, Copenhagen, Denmark
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41
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González-Henríquez CM, Sarabia-Vallejos MA. Electrospinning deposition of hydrogel fibers used as scaffold for biomembranes. Thermal stability of DPPC corroborated by ellipsometry. Chem Phys Lipids 2015. [PMID: 26206414 DOI: 10.1016/j.chemphyslip.2015.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
DPPC bilayers were deposited over thin hydrogel scaffolds using the Langmuir-Blodgett technique (with DPPC thickness ∼ 6.2 nm). Wrinkled hydrogels films were used to maintain a moist environment in order to enhance DPPC bilayer stability. Polymer mixtures were prepared using HEMA (as a base monomer) and DEGDMA, PEGDA575, PEGDA700 or AAm (as crosslinking agents); a thermal initiator was added to obtain a final pre-hydrogel (oligomer) with an adequate viscosity for thin film formation. This mixture was deposited as wrinkled film/fibers over hydrophilic silicon wafers using an electrospinning technique. Later, these samples were exposed to UV light to trigger photopolymerization, generating crosslinking bonds between hydrogel chains; this process also generated remnant surface stresses in the films that favored wrinkle formation. In the cases where DEGDMA and AAm were used as crosslinking agents, HEMA was added in higher amounts. The resultant polymer film surface showed homogenous layering with some small isolated clusters. If PEGDA575/700 was used as the crosslinking agent, we observed the formation of polymer wrinkled thin films, composed by main and secondary chains (with different dimensions). Moreover, water absorption and release was found to be mediated through surface morphology, ordering and film thickness. The thermal behavior of biomembranes was examined using ellipsometry techniques under controlled heating cycles, allowing phases and phase transitions to be detected through slight thickness variations with respect to temperature. Atomic force microscopy was used to determinate surface roughness changes according to temperature variation, temperature was varied sufficiently for the detection and recording of DPPC phase limits. Contact angle measurements corroborated and quantified system wettability, supporting the theory that wrinkled hydrogel films act to enhance DPPC bilayer stability during thermal cycles.
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Affiliation(s)
- C M González-Henríquez
- Departamento de Química, Universidad Tecnológica Metropolitana, Las Palmeras #3360, Santiago, Chile.
| | - M A Sarabia-Vallejos
- Instituto de Física, Pontificia Universidad Católica de Chile, Avda. Vicuña Mackenna #4860, Santiago, Chile
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42
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Tabaei SR, Jackman JA, Kim SO, Zhdanov VP, Cho NJ. Solvent-assisted lipid self-assembly at hydrophilic surfaces: factors influencing the formation of supported membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3125-34. [PMID: 25679066 DOI: 10.1021/la5048497] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
As a simple and efficient technique, the solvent-assisted lipid bilayer (SALB) formation method offers a versatile approach to fabricating a planar lipid bilayer on solid supports. Corresponding mechanistic aspects and the role of various governing parameters remain, however, to be better understood. Herein, we first scrutinized the effect of lipid concentration (0.01 to 5 mg/mL) and solvent type (isopropanol, n-propanol, or ethanol) on SALB formation on silicon oxide in order to identify optimal conditions for this process. The obtained fluid-phase lipid layers on silicon oxide were investigated by using the quartz crystal microbalance with dissipation monitoring, epifluorescence microscopy, and atomic force microscopy. The experimental results indicate that, in alcohol, lipid attachment to the substrate is reversible and reaches equilibrium in accordance with the bulk lipid concentration. During the solvent-exchange step, the water fraction increases and the deposited lipids are converted into planar bilayer fragments, along with the concurrent adsorption and rupture of micelles within an optimal lipid concentration range. In addition, fluid-phase lipid bilayers were successfully formed on other substrates (e.g., chrome, indium tin oxide, and titanium oxide) that are largely intractable to conventional methods (e.g., vesicle fusion). Moreover, gel-phase lipid bilayers were fabricated as well. Depending on the phase state of the lipid bilayer during fabrication, the corresponding adlayer mass varied by approximately 20% between the fluid- and gel-phase states in a manner which is consistent with the molecular packing of lipids in the two arrangements. Taken together, our findings help to explain the mechanistic details of SALB formation, optimize the corresponding procedure, and demonstrate the general utility for fabricating gel- and fluid-phase planar lipid bilayers.
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Affiliation(s)
- Seyed R Tabaei
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Joshua A Jackman
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Seong-Oh Kim
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
| | - Vladimir P Zhdanov
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
- ∥Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia
| | - Nam-Joon Cho
- †School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore
- ‡Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Drive 637553, Singapore
- §School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive 637459, Singapore
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43
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Andrecka J, Ortega Arroyo J, Takagi Y, de Wit G, Fineberg A, MacKinnon L, Young G, Sellers JR, Kukura P. Structural dynamics of myosin 5 during processive motion revealed by interferometric scattering microscopy. eLife 2015. [PMID: 25748137 DOI: 10.7554/elife.05413.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Myosin 5a is a dual-headed molecular motor that transports cargo along actin filaments. By following the motion of individual heads with interferometric scattering microscopy at nm spatial and ms temporal precision we found that the detached head occupies a loosely fixed position to one side of actin from which it rebinds in a controlled manner while executing a step. Improving the spatial precision to the sub-nm regime provided evidence for an ångstrom-level structural transition in the motor domain associated with the power stroke. Simultaneous tracking of both heads revealed that consecutive steps follow identical paths to the same side of actin in a compass-like spinning motion demonstrating a symmetrical walking pattern. These results visualize many of the critical unknown aspects of the stepping mechanism of myosin 5 including head-head coordination, the origin of lever-arm motion and the spatiotemporal dynamics of the translocating head during individual steps.
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Affiliation(s)
- Joanna Andrecka
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Jaime Ortega Arroyo
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Yasuharu Takagi
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Gabrielle de Wit
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Adam Fineberg
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Lachlan MacKinnon
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Gavin Young
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - James R Sellers
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Philipp Kukura
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
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44
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Andrecka J, Ortega Arroyo J, Takagi Y, de Wit G, Fineberg A, MacKinnon L, Young G, Sellers JR, Kukura P. Structural dynamics of myosin 5 during processive motion revealed by interferometric scattering microscopy. eLife 2015; 4. [PMID: 25748137 PMCID: PMC4391024 DOI: 10.7554/elife.05413] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 03/05/2015] [Indexed: 01/21/2023] Open
Abstract
Myosin 5a is a dual-headed molecular motor that transports cargo along actin filaments. By following the motion of individual heads with interferometric scattering microscopy at nm spatial and ms temporal precision we found that the detached head occupies a loosely fixed position to one side of actin from which it rebinds in a controlled manner while executing a step. Improving the spatial precision to the sub-nm regime provided evidence for an ångstrom-level structural transition in the motor domain associated with the power stroke. Simultaneous tracking of both heads revealed that consecutive steps follow identical paths to the same side of actin in a compass-like spinning motion demonstrating a symmetrical walking pattern. These results visualize many of the critical unknown aspects of the stepping mechanism of myosin 5 including head-head coordination, the origin of lever-arm motion and the spatiotemporal dynamics of the translocating head during individual steps.
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Affiliation(s)
- Joanna Andrecka
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Jaime Ortega Arroyo
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Yasuharu Takagi
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Gabrielle de Wit
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Adam Fineberg
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Lachlan MacKinnon
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Gavin Young
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - James R Sellers
- Laboratory of Molecular Physiology, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, United States
| | - Philipp Kukura
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford, Oxford, United Kingdom
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45
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Zhao Z, Ji X, Dimova R, Lipowsky R, Liu Y. Viscoelasticity of Poly(ethylene glycol) Solutions on Supported Lipid Bilayers via Quartz Crystal Microbalance with Dissipation. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00095] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ziliang Zhao
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China
- University
of Chinese Academy of Sciences, 100049 Beijing, China
| | - Xiangling Ji
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China
| | - Rumiana Dimova
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
| | - Reinhard Lipowsky
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
| | - Yonggang Liu
- State Key Laboratory of Polymer Physics
and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China
- Department of Theory and Bio-Systems, Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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46
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Takáts-Nyeste A, Derényi I. Development of hat-shaped liposomes on solid supports. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:15261-15265. [PMID: 25491649 DOI: 10.1021/la503774t] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We introduce a simple dynamical model which can explain the development of hat-shaped surface attached liposomes by taking membrane self-adhesion into account. The model reveals that hat formation is a general phenomenon, although it is difficult to observe experimentally. We show under what conditions hat-shaped vesicles can become observable. One such scenario, in consistency with AFM measurements, is that the dynamics is slowed down by the low rate of the outflow of the internal fluid of the vesicle through the narrow space between the two bilayers of the brim.
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Affiliation(s)
- Annamária Takáts-Nyeste
- ELTE-MTA "Lendulet" Biophysics Research Group, Department of Biological Physics, Eötvös University , Pázmány P. stny. 1A, H-1117 Budapest, Hungary
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Rabe M, Tabaei SR, Zetterberg H, Zhdanov VP, Höök F. Hydrolysis of a Lipid Membrane by Single Enzyme Molecules: Accurate Determination of Kinetic Parameters. Angew Chem Int Ed Engl 2014; 54:1022-6. [DOI: 10.1002/anie.201409603] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Indexed: 01/08/2023]
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48
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Rabe M, Tabaei SR, Zetterberg H, Zhdanov VP, Höök F. Hydrolysis of a Lipid Membrane by Single Enzyme Molecules: Accurate Determination of Kinetic Parameters. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409603] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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49
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Takáts-Nyeste A, Derényi I. Rupture of lipid vesicles near solid surfaces. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 90:052710. [PMID: 25493819 DOI: 10.1103/physreve.90.052710] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Indexed: 06/04/2023]
Abstract
The behavior of lipid vesicles near solid surfaces, despite its scientific and technological significance, is poorly understood. By simultaneously taking into account (i) the dynamics of spontaneous pore opening and closing in surface bound vesicles; (ii) their volume loss via leakage through the pores; (iii) and the propagation of their contact line, we have developed a simple model that can fully describe the detailed mechanism of and provide the necessary conditions for the rupture of vesicles and the subsequent formation of supported lipid bilayers. The predictions of the model are in qualitative agreement with many of the experimental observations.
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Affiliation(s)
- Annamária Takáts-Nyeste
- ELTE-MTA "Lendulet" Biophysics Research Group, Department of Biological Physics, Eötvös University, Pázmány P. stny. 1A, H-1117 Budapest, Hungary
| | - Imre Derényi
- ELTE-MTA "Lendulet" Biophysics Research Group, Department of Biological Physics, Eötvös University, Pázmány P. stny. 1A, H-1117 Budapest, Hungary
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Alexandrova L, Grigorov L. Studying three phase contact in the system air/DMPC water dispersion/silica. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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