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Rouvière L, Al-Hajj N, Hunel J, Aupetit C, Buffeteau T, Vellutini L, Genin E. Silane-Based SAMs Deposited by Spin Coating as a Versatile Alternative Process to Solution Immersion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6464-6471. [PMID: 35544953 DOI: 10.1021/acs.langmuir.2c00668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Functionalization of silica surfaces with silane-based self-assembled monolayers (SAMs) is widely used in material sciences to tune surface properties and introduce terminal functional groups enabling subsequent chemical surface reactions and immobilization of (bio)molecules. Here, we report on the synthesis of four organotrimethoxysilanes with various molecular structures and we compare their grafting by spin coating with the one performed by the conventional solution immersion method. Strikingly, this study clearly demonstrates that the spin coating technique is a versatile, fast, and more convenient alternative process to prepare robust, smooth, and homogeneous SAMs with similar properties and quality as those deposited via immersion. SAMs were characterized by PM-IRRAS, AFM, and wettability measurements. SAMs can undergo several chemical surface modifications, and the reactivity of amine-terminated SAM was confirmed by PM-IRRAS and fluorescence measurements.
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Affiliation(s)
- Lisa Rouvière
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Nisreen Al-Hajj
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
- Department of Chemistry, Faculty of Science, An-Najah National University, P.O. Box 7, 400 Nablus, Palestine
| | - Julien Hunel
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Christian Aupetit
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Thierry Buffeteau
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Luc Vellutini
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
| | - Emilie Genin
- Université Bordeaux, CNRS, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France
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Single-particle chemical force microscopy to characterize virus surface chemistry. Biotechniques 2020; 69:363-370. [DOI: 10.2144/btn-2020-0085] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Two important viral surface characteristics are the hydrophobicity and surface charge, which determine the viral colloidal behavior and mobility. Chemical force microscopy allows the detection of viral surface chemistry in liquid samples with small amounts of virus sample. This single-particle method requires the functionalization of an atomic force microscope (AFM) probe and covalent bonding of viruses to a surface. A hydrophobic methyl-modified AFM probe was used to study the viral surface hydrophobicity, and an AFM probe terminated with either negatively charged carboxyl acid or positively charged quaternary amine was used to study the viral surface charge. With an understanding of viral surface properties, the way in which viruses interact with the environment can be better predicted.
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Meillan M, Buffeteau T, Le Bourdon G, Thomas L, Degueil M, Heuzé K, Bennetau B, Vellutini L. Mixed Self-Assembled Monolayers with Internal Urea Group on Silica Surface. ChemistrySelect 2017. [DOI: 10.1002/slct.201702434] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Matthieu Meillan
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Thierry Buffeteau
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Gwenaëlle Le Bourdon
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Laurent Thomas
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Marie Degueil
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Karine Heuzé
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Bernard Bennetau
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
| | - Luc Vellutini
- University of Bordeaux, ISM, UMR 5255; F-33400 Talence France
- CNRS; ISM, UMR 5255; F-33400 Talence France
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Godon C, Teulon JM, Odorico M, Basset C, Meillan M, Vellutini L, Chen SWW, Pellequer JL. Conditions to minimize soft single biomolecule deformation when imaging with atomic force microscopy. J Struct Biol 2016; 197:322-329. [PMID: 28017791 DOI: 10.1016/j.jsb.2016.12.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Revised: 12/06/2016] [Accepted: 12/21/2016] [Indexed: 11/24/2022]
Abstract
A recurrent interrogation when imaging soft biomolecules using atomic force microscopy (AFM) is the putative deformation of molecules leading to a bias in recording true topographical surfaces. Deformation of biomolecules comes from three sources: sample instability, adsorption to the imaging substrate, and crushing under tip pressure. To disentangle these causes, we measured the maximum height of a well-known biomolecule, the tobacco mosaic virus (TMV), under eight different experimental conditions positing that the maximum height value is a specific indicator of sample deformations. Six basic AFM experimental factors were tested: imaging in air (AIR) versus in liquid (LIQ), imaging with flat minerals (MICA) versus flat organic surfaces (self-assembled monolayers, SAM), and imaging forces with oscillating tapping mode (TAP) versus PeakForce tapping (PFT). The results show that the most critical parameter in accurately measuring the height of TMV in air is the substrate. In a liquid environment, regardless of the substrate, the most critical parameter is the imaging mode. Most importantly, the expected TMV height values were obtained with both imaging with the PeakForce tapping mode either in liquid or in air at the condition of using self-assembled monolayers as substrate. This study unambiguously explains previous poor results of imaging biomolecules on mica in air and suggests alternative methodologies for depositing soft biomolecules on well organized self-assembled monolayers.
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Affiliation(s)
| | - Jean-Marie Teulon
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France; CNRS, IBS, F-38044 Grenoble, France; CEA, IBS, F-38044 Grenoble, France
| | - Michael Odorico
- ICSM-UMR5257 CEA/CNRS/UM2/ENSCM, F-30207 Bagnols sur Cèze, France
| | | | - Matthieu Meillan
- Univ. Bordeaux, ISM, UMR 5255, F-33400 Talence, France; CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Luc Vellutini
- Univ. Bordeaux, ISM, UMR 5255, F-33400 Talence, France; CNRS, ISM, UMR 5255, F-33400 Talence, France
| | | | - Jean-Luc Pellequer
- Univ. Grenoble Alpes, IBS, F-38044 Grenoble, France; CNRS, IBS, F-38044 Grenoble, France; CEA, IBS, F-38044 Grenoble, France.
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Costa L, Andriatis A, Brennich M, Teulon JM, Chen SWW, Pellequer JL, Round A. Combined small angle X-ray solution scattering with atomic force microscopy for characterizing radiation damage on biological macromolecules. BMC STRUCTURAL BIOLOGY 2016; 16:18. [PMID: 27788689 PMCID: PMC5081678 DOI: 10.1186/s12900-016-0068-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 10/06/2016] [Indexed: 12/19/2022]
Abstract
BACKGROUND Synchrotron radiation facilities are pillars of modern structural biology. Small-Angle X-ray scattering performed at synchrotron sources is often used to characterize the shape of biological macromolecules. A major challenge with high-energy X-ray beam on such macromolecules is the perturbation of sample due to radiation damage. RESULTS By employing atomic force microscopy, another common technique to determine the shape of biological macromolecules when deposited on flat substrates, we present a protocol to evaluate and characterize consequences of radiation damage. It requires the acquisition of images of irradiated samples at the single molecule level in a timely manner while using minimal amounts of protein. The protocol has been tested on two different molecular systems: a large globular tetremeric enzyme (β-Amylase) and a rod-shape plant virus (tobacco mosaic virus). Radiation damage on the globular enzyme leads to an apparent increase in molecular sizes whereas the effect on the long virus is a breakage into smaller pieces resulting in a decrease of the average long-axis radius. CONCLUSIONS These results show that radiation damage can appear in different forms and strongly support the need to check the effect of radiation damage at synchrotron sources using the presented protocol.
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Affiliation(s)
- Luca Costa
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, Grenoble, 38000 France
- Present Address: CBS, Centre de Biochimie Structurale, CNRS UMR 5048-INSERM UMR 1054, 29, Rue de Navacelles, Montpellier, 34090 France
| | - Alexander Andriatis
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, Grenoble, 38000 France
- MIT, 77 Massachusetts Ave., Cambridge, 02139 MA USA
| | - Martha Brennich
- ESRF, The European Synchrotron, 71 Avenue des Martyrs, Grenoble, 38000 France
| | - Jean-Marie Teulon
- Univ. Grenoble Alpes, 71 Avenue des Martyrs, Grenoble, 38044 France
- CNRS, IBS, 71 Avenue des Martyrs, Grenoble, 38044 France
- CEA, IBS, 71 Avenue des Martyrs, Grenoble, France
| | - Shu-wen W. Chen
- Univ. Grenoble Alpes, 71 Avenue des Martyrs, Grenoble, 38044 France
- CNRS, IBS, 71 Avenue des Martyrs, Grenoble, 38044 France
- CEA, IBS, 71 Avenue des Martyrs, Grenoble, France
| | - Jean-Luc Pellequer
- Univ. Grenoble Alpes, 71 Avenue des Martyrs, Grenoble, 38044 France
- CNRS, IBS, 71 Avenue des Martyrs, Grenoble, 38044 France
- CEA, IBS, 71 Avenue des Martyrs, Grenoble, France
| | - Adam Round
- European Molecular Biology Laboratory, 71 Avenue des Martyrs, Grenoble, 38000 France
- Unit for Virus Host-Cell Interactions, Univ. Grenoble Alpes-EMBL-CNRS, 71 Avenue des Martyrs, Grenoble, 38000 France
- Faculty of Natural Sciences, Keele University, Keele, Staffordshire UK
- Present Address: European XFEL GmbH, Holzkoppel 4, Schenefeld, 22869 Germany
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Altintas Z, Pocock J, Thompson KA, Tothill IE. Comparative investigations for adenovirus recognition and quantification: Plastic or natural antibodies? Biosens Bioelectron 2015; 74:996-1004. [DOI: 10.1016/j.bios.2015.07.076] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 07/16/2015] [Accepted: 07/30/2015] [Indexed: 11/25/2022]
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Chen SWW, Teulon JM, Godon C, Pellequer JL. Atomic force microscope, molecular imaging, and analysis. J Mol Recognit 2015. [PMID: 26224520 DOI: 10.1002/jmr.2491] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Image visibility is a central issue in analyzing all kinds of microscopic images. An increase of intensity contrast helps to raise the image visibility, thereby to reveal fine image features. Accordingly, a proper evaluation of results with current imaging parameters can be used for feedback on future imaging experiments. In this work, we have applied the Laplacian function of image intensity as either an additive component (Laplacian mask) or a multiplying factor (Laplacian weight) for enhancing image contrast of high-resolution AFM images of two molecular systems, an unknown protein imaged in air, provided by AFM COST Action TD1002 (http://www.afm4nanomedbio.eu/), and tobacco mosaic virus (TMV) particles imaged in liquid. Based on both visual inspection and quantitative representation of contrast measurements, we found that the Laplacian weight is more effective than the Laplacian mask for the unknown protein, whereas for the TMV system the strengthened Laplacian mask is superior to the Laplacian weight. The present results indicate that a mathematical function, as exemplified by the Laplacian function, may yield varied processing effects with different operations. To interpret the diversity of molecular structure and topology in images, an explicit expression for processing procedures should be included in scientific reports alongside instrumental setups.
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Affiliation(s)
| | - Jean-Marie Teulon
- CEA, iBEB, Service de Biochimie et Toxicologie Nucléaire, F-30207, Bagnols sur Cèze, France.,CEA, IBS, Univ. Grenoble Alpes/CNRS/CEA, 71 avenue des Martyrs CS 10090, F-38044, Grenoble cedex 9, France
| | - Christian Godon
- CEA, iBEB, Service de Biochimie et Toxicologie Nucléaire, F-30207, Bagnols sur Cèze, France.,CEA, iBEB, Service de Biologie Végétale et Microbiologie Environnementale/LBDP, F-13108, Saint-Paul-Lez-Durance, France
| | - Jean-Luc Pellequer
- CEA, iBEB, Service de Biochimie et Toxicologie Nucléaire, F-30207, Bagnols sur Cèze, France.,CEA, IBS, Univ. Grenoble Alpes/CNRS/CEA, 71 avenue des Martyrs CS 10090, F-38044, Grenoble cedex 9, France
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Ramin MA, Le Bourdon G, Heuzé K, Degueil M, Buffeteau T, Bennetau B, Vellutini L. Epoxy-terminated self-assembled monolayers containing internal urea or amide groups. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2783-2789. [PMID: 25679263 DOI: 10.1021/la5049375] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the synthesis of new coupling agents with internal amide or urea groups possessing an epoxy-terminal group and trimethoxysilyl-anchoring group. The structural characterizations of the corresponding self-assembled monolayers (SAMs) were performed by polarization modulation infrared reflection adsorption spectroscopy (PM-IRRAS). The molecular assembly is mainly based on the intermolecular hydrogen-bonding between adjacent amide or urea groups in the monolayers. Because of the steric hindrance of amide or urea groups, the distance between the alkyl chains is too large to establish van der Waals interactions, inducing their disorder. The reactivity of the epoxy-terminal groups was successfully investigated through reaction with a fluorescent probe. We show that SAMs containing internal urea or amide groups exhibited a higher density of accessible epoxide groups than the corresponding long-chain (C22) glycidyl-terminated SAM.
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Affiliation(s)
- Michaël A Ramin
- ISM, UMR 5255 CNRS, Université de Bordeaux , 351 cours de la Liberation CS 10004, 33 405 Talence, France
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