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Beard JW, Hunt SL, Evans A, Goenner C, Miller BL. Mimicking a Cellular Crowding Environment for Enzyme-Free Paper-Based Nucleic Acid Tests at the Point of Care. ACS Sens 2024. [PMID: 39344686 DOI: 10.1021/acssensors.4c00539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
Abstract
Point of care (PoC) nucleic acid amplification tests (NAATs) are a cornerstone of public health, providing the earliest and most accurate diagnostic method for many communicable diseases in the same location where the patient receives treatment. Communicable diseases, such as human immunodeficiency virus (HIV), disproportionately impact low-resource communities where NAATs are often unobtainable due to the resource-intensive enzymes that drive the tests. Enzyme-free nucleic acid detection methods, such as hybridization chain reaction (HCR), use DNA secondary structures for self-driven amplification schemes, producing large DNA nanostructures, capable of single-molecule detection in cellulo. These thermodynamically driven DNA-based tests have struggled to penetrate the PoC diagnostic field due to their inadequate limits of detection or complex workflows. Here, we present a proof-of-concept NAAT that combines HCR-based amplification of a target nucleic acid sequence with paper-based nucleic acid filtration and enrichment capable of detecting sub-pM levels of synthetic DNA. We reconstruct the favorable hybridization conditions of an in cellulo reaction in vitro by incubating HCR in an evaporating, microvolume environment containing poly(ethylene glycol) as a crowding agent. We demonstrate that the kinetics and thermodynamics of DNA-DNA and DNA-RNA hybridization is enhanced by the dynamic evaporating environment and inclusion of crowding agents, bringing HCR closer to meeting PoC NAAT needs.
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Affiliation(s)
- Jeffrey W Beard
- Department of Dermatology, University of Rochester, Rochester, New York 14627, United States
| | - Samuel L Hunt
- Department of Dermatology, University of Rochester, Rochester, New York 14627, United States
| | - Alexander Evans
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Coleman Goenner
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York 14627, United States
| | - Benjamin L Miller
- Department of Dermatology, University of Rochester, Rochester, New York 14627, United States
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627, United States
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York 14627, United States
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2
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Beard JW, Hunt SL, Evans A, Goenner C, Miller BL. Mimicking an in cellulo environment for enzyme-free paper-based nucleic acid tests at the point of care. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.27.582375. [PMID: 38464301 PMCID: PMC10925243 DOI: 10.1101/2024.02.27.582375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Point of care (PoC) nucleic acid amplification tests (NAATs) are a cornerstone of public health, providing the earliest and most accurate diagnostic method for many communicable diseases, such as HIV, in the same location the patient receives treatment. Communicable diseases disproportionately impact low-resource communities where NAATs are often unobtainable due to the resource intensive enzymes that drive the tests. Enzyme-free nucleic acid detection methods, such as hybridization chain reaction (HCR), use DNA secondary structures for self-driven amplification schemes producing large DNA nanostructures and capable of single molecule detection in cellulo. These thermodynamically driven DNA-based tests have struggled to penetrate the PoC diagnostic field due to their inadequate limits of detection or complex workflows. Here we present a proof-of-concept NAAT that combines HCR-based amplification of a target nucleic acid sequence with paper-based nucleic acid filtration and enrichment capable of detecting sub pM levels of synthetic DNA. We reconstruct the favorable hybridization conditions of an in cellulo reaction in vitro by incubating HCR in an evaporating, microvolume environment containing poly(ethylene glycol) as a crowding agent. We demonstrate that the kinetics and thermodynamics of DNA-DNA and DNA-RNA hybridization is enhanced by the dynamic evaporating environment and inclusion of crowding agents, bringing HCR closer to meeting PoC NAAT needs.
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Affiliation(s)
- Jeffrey W. Beard
- Department of Dermatology, University of Rochester, Rochester, NY 14627, USA
| | - Samuel L. Hunt
- Department of Dermatology, University of Rochester, Rochester, NY 14627, USA
| | - Alexander Evans
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
| | - Coleman Goenner
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, NY 14627, USA
| | - Benjamin L. Miller
- Department of Dermatology, University of Rochester, Rochester, NY 14627, USA
- Department of Biomedical Engineering, University of Rochester, Rochester, NY 14627, USA
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, NY 14627, USA
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3
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Peng Y, Li D, Qiao B, Gao Z, Pu Q, Pang H, Lai X, Zhang R, Zhao X, Zhao G, Xu D, Han F, Wang Y, Ji Y, Pei H, Wu Q. Protonation-mediated DNA tile self-assembly with nuclease resistance characteristic for signal-amplified detection of microRNAs. Biosens Bioelectron 2024; 246:115869. [PMID: 38039736 DOI: 10.1016/j.bios.2023.115869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/20/2023] [Indexed: 12/03/2023]
Abstract
DNA nanotechnology, developing rapidly in recent years, has unprecedented superiorities in biological application-oriented research including high programmability, convenient functionalization, reconfigurable structure, and intrinsic biocompatibility. However, the susceptibility to nucleases in the physiological environment has been an obstacle to applying DNA nanostructures in biological science research. In this study, a new DNA self-assembly strategy, mediated by double-protonated small molecules instead of classical metal ions, is developed to enhance the nuclease resistance of DNA nanostructures while retaining their integrality and functionality, and the relative application has been launched in the detection of microRNAs (miRNAs). Faced with low-abundance miRNAs, we integrate hybrid chain reaction (HCR) with DNA self-assembly in the presence of double-protonated small molecules to construct a chemiluminescence detection platform with nuclease resistance, which utilizes the significant difference of molecular weight between DNA arrays and false-positive products to effectively separate of reaction products and remove the detection background. This strategy attaches importance to the nucleic acid stability during the assay process via improving nuclease resistance while rendering the detection results for miRNAs more authentic and reliable, opening our eyes to more possibilities for the multiple applications of customized DNA nanostructures in biology, including bioassay, bioimaging, drug delivery, and cell modulation.
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Affiliation(s)
- Yanan Peng
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Dongxia Li
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Bin Qiao
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China; Key Laboratory of Emergency and Trauma of Ministry of Education, Research Unit of Island Emergency Medicine, Chinese Academy of Medical Sciences (No. 2019RU013), Hainan Medical University, Haikou, 571199, PR China
| | - Zhijun Gao
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Qiumei Pu
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Huajie Pang
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Xiangde Lai
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Rui Zhang
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Xuan Zhao
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Guangyuan Zhao
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Dan Xu
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, School of Pharmacy, Hainan Medical University, Haikou, 571199, PR China
| | - Feng Han
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China
| | - Yuanyuan Wang
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China; Key Laboratory of Emergency and Trauma of Ministry of Education, Research Unit of Island Emergency Medicine, Chinese Academy of Medical Sciences (No. 2019RU013), Hainan Medical University, Haikou, 571199, PR China
| | - Yuxiang Ji
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Hua Pei
- The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China
| | - Qiang Wu
- The First Affiliated Hospital, Hainan Medical University, Haikou, 570102, PR China; The Second Affiliated Hospital, School of Tropical Medicine, Hainan Medical University, Haikou, 570311, PR China; Key Laboratory of Emergency and Trauma of Ministry of Education, Research Unit of Island Emergency Medicine, Chinese Academy of Medical Sciences (No. 2019RU013), Hainan Medical University, Haikou, 571199, PR China.
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4
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Chen K, Zhu L, Du Z, Lan X, Huang K, Zhang W, Xu W. Docking-aided rational tailoring of a fluorescence- and affinity-enhancing aptamer for a label-free ratiometric malachite green point-of-care aptasensor. JOURNAL OF HAZARDOUS MATERIALS 2023; 447:130798. [PMID: 36669418 DOI: 10.1016/j.jhazmat.2023.130798] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/17/2023]
Abstract
Although nucleic acid aptasensors are increasingly applied in the detection of environmentally hazardous biomolecules, several formidable challenges remain with this technique because of their vulnerability, high cost and suboptimal sensitivity. Here, a docking-aided rational tailoring (DART) strategy was established at three levels and in two dimensions for the refinement of malachite green (MG) DNA aptamers. Guided by in silico molecular docking, coarse and fine tailoring were conducted at three levels each, to significantly enhance fluorescence activation intensity and binding affinity in two dimensions. Empowered by the results of the rational tailoring, a mechanistic view of the MG DNA aptamer-target interaction was thoroughly analyzed via four types of interactions. To meet the demand for point-of-care testing (POCT), a label-free and ratiometric fluorescent aptasensor was developed leveraging the tailored MG aptamer, based on the binding site competition-equilibrium effect via the introduction of a reference dye. This sensitive, specific, low-cost and rapid aptasensor subsequently demonstrated outstanding detection performance, achieving an ideal signal response range of 5 nmol·L-1 - 6 μmol·L-1 and a low limit of detection (LOD) of 1.49 nmol·L-1. The DART strategy and systematic exploration of the MG DNA luminescent aptamers herein will provide a valuable reference in the field of aptamer tailoring, biosensing and bioimaging. The proposed label-free ratiometric aptasensor also provides a highly generalizable strategy for hazardous biomolecular detection.
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Affiliation(s)
- Keren Chen
- Food Laboratory of Zhongyuan, Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Longjiao Zhu
- Food Laboratory of Zhongyuan, Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China
| | - Zaihui Du
- Food Laboratory of Zhongyuan, Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Xinyue Lan
- Food Laboratory of Zhongyuan, Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Kunlun Huang
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Wenqiang Zhang
- Department of Mechanical Design and Manufacturing, College of Engineering, China Agricultural University, Beijing 100083, China
| | - Wentao Xu
- Food Laboratory of Zhongyuan, Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing 100193, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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5
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Calcium mediated DNA binding in non-lamellar structures formed by DOPG/glycerol monooleate. Chem Phys Lipids 2021; 239:105118. [PMID: 34280362 DOI: 10.1016/j.chemphyslip.2021.105118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 05/28/2021] [Accepted: 07/14/2021] [Indexed: 11/21/2022]
Abstract
In order to test an encapsulation method of short fragmented DNA (∼ 20-300 bp), we study the solubilisation in 150 mM solution of NaCl of a cubic phase formed by glycerol monooleate (GMO) with negatively charged dioleoylphosphatidylglycerol (DOPG) up to the level of unilamellar vesicles and, subsequently, the restoration of the cubic phase using Ca2+ cations. We performed small angle X-ray and neutron scattering (SAXS and SANS) to follow structural changes in DOPG/GMO mixtures induced by increasing DOPG content. The cubic phase (Pn3m space group) is preserved up to ∼ 11 mol% of DOPG in DOPG/GMO. Above 20 mol%, the SANS curves are typical of unilamellar vesicles. The thickness of the DOPG/GMO lipid bilayer (dL) decreases slightly with increasing fraction of DOPG. The addition of 15 mM of CaCl2 solution shields the electrostatic repulsions of DOPG molecules, increases slightly dL and restores the cubic structures in the mixtures up to ∼ 37 mol% of DOPG. Zeta potential shows negative surface charge. The analysis of the data provides the radius of the water nano-channels of the formed non-lamellar structures. We discuss their dimensions with respect to DNA binding. In addition, Ca2+ mediates DNA - DOPG/GMO binding. The formed hexagonal phase, HII, binds less of DNA in comparison with cubic phases (∼ 6 wt% and ∼ 20 wt% of the total amount, respectively). The studied system can be utilized as anionic QII delivery vector for genetic material.
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6
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Liu YF, Ran SY. Divalent metal ions and intermolecular interactions facilitate DNA network formation. Colloids Surf B Biointerfaces 2020; 194:111117. [PMID: 32512310 DOI: 10.1016/j.colsurfb.2020.111117] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 04/30/2020] [Accepted: 05/06/2020] [Indexed: 02/08/2023]
Abstract
The interactions between divalent metal ions and DNA are crucial for basic life processes. These interactions are also important in advanced technological products such as DNA-based ion sensors. Current polyelectrolyte theories cannot describe these interactions well and do not consider the corresponding dynamics. In this study, we report the single-molecule dynamics of the binding of divalent metal ions to a single DNA molecule and the morphology characterization of the complex. We found that most of the divalent metal ions (Mn2+, Zn2+, Co2+, Ni2+, and Cd2+), except Mg2+ and Ca2+, could cause monomolecular DNA condensation. For transition metal ions, different ionic strengths were required to induce the compaction, and different shortening speeds were displayed in the dynamics, indicating ionic specificity. Atomic force microscopy revealed that the morphologies of the metal ion-DNA complexes were affected by the ionic strength of the metal ion, DNA chain length, and DNA concentration. At low metal ion concentration, DNA tended to adopt a random coil conformation. Increasing the ionic strength led to network-like condensed structures, suggesting that divalent metal ions can induce attraction between DNA molecules. Furthermore, higher DNA concentration and longer chain length enhanced intermolecular interactions and consequently resulted in network structures with a higher degree of interconnectivity.
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Affiliation(s)
- Yin-Feng Liu
- Department of Physics, Wenzhou University, Wenzhou 325035, China
| | - Shi-Yong Ran
- Department of Physics, Wenzhou University, Wenzhou 325035, China.
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7
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Liskayová G, Hubčík L, Búcsi A, Fazekaš T, Martínez JC, Devínsky F, Pisárčik M, Hanulová M, Ritz S, Uhríková D. pH-Sensitive N, N-Dimethylalkane-1-amine N-Oxides in DNA Delivery: From Structure to Transfection Efficiency. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13382-13395. [PMID: 31537066 DOI: 10.1021/acs.langmuir.9b02353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
pH-sensitive liposomes composed of homologues of series of N,N-dimethylalkane-1-amine N-oxides (CnNO, n = 8-18, where n is the number of carbon atoms in the alkyl substituent) and neutral phospholipid dioleoylphosphatidylethanolamine (DOPE) were prepared at two molar ratios (CnNO/DOPE = 0.4:1 and 1:1) and tested for their in vitro transfection activity. Several techniques (SAXS/WAXS, UV-vis, zeta potential measurements, confocal microscopy) were applied to characterize the system in an effort to unravel the relationship among the transfection efficiency, structure, and composition of the lipoplexes. The transfection efficiency of CnNO/DOPE for plasmid DNA in U2OS cells follows a quasi-parabolic dependence on CnNO's alkyl substituent length with a maximum at n = 16. The transfection efficiency of CnNO/DOPE (n = 12-18) lipoplexes was found to be higher than that of commercially available Lipofectamine 2000. C16NO/DOPE also positively transfected HEK 293T and HeLa cells. Small-angle X-ray scattering (SAXS) shows large structural diversity depending on the complex's composition and pH. Transfection efficiencies mediated by two structures, either a condensed lamellar (Lαc) or epitaxially connected Lαc and a condensed inverted hexagonal (HIIc) phase (Lαc & HIIc), were found to be very similar. The change in pH from acidic to neutral induces phase transition Lαc & HIIc → QII + Lα, with cubic phase QII of the Pn3m space group. QII detected in lipoplexes of most efficient composition CnNO/DOPE (n = 16 and 18) facilitates DNA release and promotes its internalization in the cell.
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Affiliation(s)
| | | | | | | | | | | | | | - Mária Hanulová
- Microscopy and Histology Core Facility at the Institute of Molecular Biology (IMB gGmbH) , Ackermannweg 4 , 55128 Mainz , Germany
| | - Sandra Ritz
- Microscopy and Histology Core Facility at the Institute of Molecular Biology (IMB gGmbH) , Ackermannweg 4 , 55128 Mainz , Germany
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8
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Tamkovich S, Laktionov P. Cell-surface-bound circulating DNA in the blood: Biology and clinical application. IUBMB Life 2019; 71:1201-1210. [PMID: 31091350 DOI: 10.1002/iub.2070] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 04/17/2019] [Indexed: 01/04/2023]
Abstract
Cell-surface-bound extracellular DNA (csbDNA) is present on the outer membrane of blood cells, including both red blood cells and leukocytes. Although less well characterized than cell-free DNA (cfDNA) in plasma and serum, leukocyte and red blood cell csbDNA form a considerable fraction of the blood extracellular nucleic acids pool, with typically at least comparable amount of DNA occurring bound to the outer surface of cells as compared with circulating free DNA in plasma. The cellular origin of csbDNA is not clear; however, as with cfDNA, in patients with cancer a proportion is derived from the tumor, thus making it potentially a useful source of DNA for cancer diagnosis, prognosis, and monitoring. © 2019 IUBMB Life, 71(9):1201-1210, 2019.
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Affiliation(s)
- Svetlana Tamkovich
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia.,Novosibirsk National Research State University, Novosibirsk, Russia
| | - Pavel Laktionov
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia.,Meshalkin Novosibirsk Research Institute of Circulation Pathology, Novosibirsk, Russia
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9
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Kinetics of DNA condensation with DPPC: effect of calcium and sodium cations. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0340-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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pH-sensitive N,N-(dimethyl)-N-alkanamine-N-oxides as gene delivery vectors. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0171-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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11
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Hubčík L, Funari SS, Pullmannová P, Devínsky F, Uhríková D. Stimuli responsive polymorphism of C12NO/DOPE/DNA complexes: Effect of pH, temperature and composition. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1848:1127-38. [DOI: 10.1016/j.bbamem.2015.01.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2014] [Revised: 01/09/2015] [Accepted: 01/29/2015] [Indexed: 01/10/2023]
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12
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Divalent Metal Cations in DNA–Phospholipid Binding. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/b978-0-12-418698-9.00004-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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13
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Angelov B, Angelova A, Papahadjopoulos-Sternberg B, Hoffmann SV, Nicolas V, Lesieur S. Protein-Containing PEGylated Cubosomic Particles: Freeze-Fracture Electron Microscopy and Synchrotron Radiation Circular Dichroism Study. J Phys Chem B 2012; 116:7676-86. [DOI: 10.1021/jp303863q] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Borislav Angelov
- Institute of Macromolecular
Chemistry, Academy of Sciences of the Czech Republic, Heyrovského nam. 1888/2, Praha 6, Czech Republic
| | - Angelina Angelova
- CNRS UMR8612 Physico-chimie-Pharmacotechnie-Biopharmacie,
Univ Paris Sud 11, LabEx LERMIT, 92296
Châtenay-Malabry, France
| | | | - Søren V. Hoffmann
- Institute for Storage Ring Facilities
(ISA), Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
| | - Valérie Nicolas
- Imaging platform, IFR141, Institut
Paris-Sud d’Innovation Thérapeutique (IPSIT), Univ Paris Sud 11, 92290 Châtenay-Malabry, France
| | - Sylviane Lesieur
- CNRS UMR8612 Physico-chimie-Pharmacotechnie-Biopharmacie,
Univ Paris Sud 11, LabEx LERMIT, 92296
Châtenay-Malabry, France
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14
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Barrett MJ, Oliver PM, Cheng P, Cetin D, Vezenov D. High density single-molecule-bead arrays for parallel single molecule force spectroscopy. Anal Chem 2012; 84:4907-14. [PMID: 22548234 DOI: 10.1021/ac3001622] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The assembly of a highly parallel force spectroscopy tool requires careful placement of single-molecule targets on the substrate and the deliberate manipulation of a multitude of force probes. Since the probe must approach the target biomolecule for covalent attachment, while avoiding irreversible adhesion to the substrate, the use of polymer microspheres as force probes to create the tethered bead array poses a problem. Therefore, the interactions between the force probe and the surface must be repulsive at very short distances (<5 nm) and attractive at long distances. To achieve this balance, the chemistry of the substrate, force probe, and solution must be tailored to control the probe-surface interactions. In addition to an appropriately designed chemistry, it is necessary to control the surface density of the target molecule in order to ensure that only one molecule is interrogated by a single force probe. We used gold-thiol chemistry to control both the substrate's surface chemistry and the spacing of the studied molecules, through binding of the thiol-terminated DNA and an inert thiol forming a blocking layer. For our single molecule array, we modeled the forces between the probe and the substrate using DLVO theory and measured their magnitude and direction with colloidal probe microscopy. The practicality of each system was tested using a probe binding assay to evaluate the proportion of the beads remaining adhered to the surface after application of force. We have translated the results specific for our system to general guiding principles for preparation of tethered bead arrays and demonstrated the ability of this system to produce a high yield of active force spectroscopy probes in a microwell substrate. This study outlines the characteristics of the chemistry needed to create such a force spectroscopy array.
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Affiliation(s)
- Michael J Barrett
- Department of Chemistry, Lehigh University, 6 East Packer Avenue, Bethlehem, Pennsylvania 18015, United States
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15
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Uhríková D, Kučerka N, Lengyel A, Pullmannová P, Teixeira J, Murugova T, Funari SS, Balgavý P. Lipid bilayer – DNA interaction mediated by divalent metal cations: SANS and SAXD study. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/351/1/012011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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