1
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Diaz J, Pietsch M, Davila M, Jaimes G, Hudson A, Pellois JP. Elucidating the Impact of Payload Conjugation on the Cell-Penetrating Efficiency of the Endosomal Escape Peptide dfTAT: Implications for Future Designs for CPP-Based Delivery Systems. Bioconjug Chem 2023; 34:1861-1872. [PMID: 37774419 PMCID: PMC10644971 DOI: 10.1021/acs.bioconjchem.3c00369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/18/2023] [Indexed: 10/01/2023]
Abstract
Cell-penetrating peptides (CPPs) are promising tools for the intracellular delivery of various biological payloads. However, the impact of payload conjugation on the cell-penetrating activity of CPPs is poorly understood. This study focused on dfTAT, a modified version of the HIV-TAT peptide with enhanced endosomal escape activity, to explore how different payloads affect its cell-penetrating activity. We systematically examined dfTAT conjugated with the SnoopTag/SnoopCatcher pair and found that while smaller payloads such as short peptides do not significantly impair dfTAT's cell delivery activity, larger payloads markedly reduce both its endocytic uptake and endosomal escape efficiency. Our results highlight the role of the payload size and bulk in limiting CPP-mediated delivery. While further research is needed to understand the molecular underpinnings of these effects, our findings pave the way for developing more effective CPP-based delivery systems.
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Affiliation(s)
- Joshua Diaz
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Miles Pietsch
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Marissa Davila
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Gerardo Jaimes
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Alexis Hudson
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
| | - Jean-Philippe Pellois
- Department
of Biochemistry and Biophysics, Texas A&M
University, College
Station, Texas 77843, United States
- Department
of Chemistry, Texas A&M University, College Station, Texas 77843, United States
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2
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Aksakal R, Tonneaux C, Uvyn A, Fossépré M, Turgut H, Badi N, Surin M, De Geest BG, Du Prez FE. Sequence-defined antibody-recruiting macromolecules. Chem Sci 2023; 14:6572-6578. [PMID: 37350815 PMCID: PMC10284026 DOI: 10.1039/d3sc01507f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/22/2023] [Indexed: 06/24/2023] Open
Abstract
Antibody-recruiting molecules represent a novel class of therapeutic agents that mediate the recruitment of endogenous antibodies to target cells, leading to their elimination by the immune system. Compared to single-ligand copies, macromolecular scaffolds presenting multiple copies of an antibody-binding ligand offer advantages in terms of increased complex avidity. In this study, we describe the synthesis of sequence-defined macromolecules designed for antibody recruitment, utilising dinitrophenol (DNP) as a model antibody-recruiting motif. The use of discrete macromolecules gives access to varying the spacing between DNP motifs while maintaining the same chain length. This characteristic enables the investigation of structure-dependent binding interactions with anti-DNP antibodies. Through solid-phase thiolactone chemistry, we synthesised a series of oligomers with precisely localised DNP motifs along the backbone and a terminal biotin motif for surface immobilisation. Utilising biolayer interferometry analysis, we observed that oligomers with adjacent DNP motifs exhibited enhanced avidity for anti-DNP antibodies. Molecular modelling provided insights into the structures and dynamics of the various macromolecules, shedding light on the accessibility of the ligands to the antibodies. Overall, our findings highlight that the use of sequence-defined macromolecules can contribute to our understanding of structure-activity relationships and provide insights for the design of novel antibody-recruiting therapeutic agents.
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Affiliation(s)
- Resat Aksakal
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University 9000 Ghent Belgium
| | - Corentin Tonneaux
- Laboratory for Chemistry of Novel Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons-UMONS 7000 Mons Belgium
| | - Annemiek Uvyn
- Department of Pharmaceutics, Ghent University Ottergemsesteenweg 460 9000 Ghent Belgium
| | - Mathieu Fossépré
- Laboratory for Chemistry of Novel Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons-UMONS 7000 Mons Belgium
| | - Hatice Turgut
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University 9000 Ghent Belgium
| | - Nezha Badi
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University 9000 Ghent Belgium
| | - Mathieu Surin
- Laboratory for Chemistry of Novel Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons-UMONS 7000 Mons Belgium
| | - Bruno G De Geest
- Department of Pharmaceutics, Ghent University Ottergemsesteenweg 460 9000 Ghent Belgium
| | - Filip E Du Prez
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University 9000 Ghent Belgium
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3
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Arnold DP, Takatori SC. Bio-enabled Engineering of Multifunctional "Living" Surfaces. ACS NANO 2023. [PMID: 37294942 DOI: 10.1021/acsnano.3c03138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Through the magic of "active matter"─matter that converts chemical energy into mechanical work to drive emergent properties─biology solves a myriad of seemingly enormous physical challenges. Using active matter surfaces, for example, our lungs clear an astronomically large number of particulate contaminants that accompany each of the 10,000 L of air we respire per day, thus ensuring that the lungs' gas exchange surfaces remain functional. In this Perspective, we describe our efforts to engineer artificial active surfaces that mimic active matter surfaces in biology. Specifically, we seek to assemble the basic active matter components─mechanical motor, driven constituent, and energy source─to design surfaces that support the continuous operation of molecular sensing, recognition, and exchange. The successful realization of this technology would generate multifunctional, "living" surfaces that combine the dynamic programmability of active matter and the molecular specificity of biological surfaces and apply them to applications in biosensors, chemical diagnostics, and other surface transport and catalytic processes. We describe our recent efforts in bio-enabled engineering of living surfaces through the design of molecular probes to understand and integrate native biological membranes into synthetic materials.
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Affiliation(s)
- Daniel P Arnold
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Sho C Takatori
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
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4
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Takatori SC, Son S, Lee DSW, Fletcher DA. Engineered molecular sensors for quantifying cell surface crowding. Proc Natl Acad Sci U S A 2023; 120:e2219778120. [PMID: 37186825 PMCID: PMC10214205 DOI: 10.1073/pnas.2219778120] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Accepted: 04/13/2023] [Indexed: 05/17/2023] Open
Abstract
Cells mediate interactions with the extracellular environment through a crowded assembly of transmembrane proteins, glycoproteins and glycolipids on their plasma membrane. The extent to which surface crowding modulates the biophysical interactions of ligands, receptors, and other macromolecules is poorly understood due to the lack of methods to quantify surface crowding on native cell membranes. In this work, we demonstrate that physical crowding on reconstituted membranes and live cell surfaces attenuates the effective binding affinity of macromolecules such as IgG antibodies in a surface crowding-dependent manner. We combine experiment and simulation to design a crowding sensor based on this principle that provides a quantitative readout of cell surface crowding. Our measurements reveal that surface crowding decreases IgG antibody binding by 2 to 20 fold in live cells compared to a bare membrane surface. Our sensors show that sialic acid, a negatively charged monosaccharide, contributes disproportionately to red blood cell surface crowding via electrostatic repulsion, despite occupying only ~1% of the total cell membrane by mass. We also observe significant differences in surface crowding for different cell types and find that expression of single oncogenes can both increase and decrease crowding, suggesting that surface crowding may be an indicator of both cell type and state. Our high-throughput, single-cell measurement of cell surface crowding may be combined with functional assays to enable further biophysical dissection of the cell surfaceome.
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Affiliation(s)
- Sho C. Takatori
- Department of Bioengineering, University of California, Berkeley, CA94720
- Department of Chemical Engineering, University of California, Santa Barbara, CA93106
| | - Sungmin Son
- Department of Bioengineering, University of California, Berkeley, CA94720
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Daniel S. W. Lee
- Department of Bioengineering, University of California, Berkeley, CA94720
| | - Daniel A. Fletcher
- Department of Bioengineering, University of California, Berkeley, CA94720
- University of California, Berkeley/University of California, San Francisco Graduate Group in Bioengineering, Berkeley, CA94720
- Division of Biological Systems and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA94720
- Chan Zuckerberg Biohub, San Francisco, CA94158
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5
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Arnold DP, Xu Y, Takatori SC. Antibody binding reports spatial heterogeneities in cell membrane organization. Nat Commun 2023; 14:2884. [PMID: 37208326 DOI: 10.1038/s41467-023-38525-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 05/05/2023] [Indexed: 05/21/2023] Open
Abstract
The spatial organization of cell membrane glycoproteins and glycolipids is critical for mediating the binding of ligands, receptors, and macromolecules on the plasma membrane. However, we currently do not have the methods to quantify the spatial heterogeneities of macromolecular crowding on live cell surfaces. In this work, we combine experiment and simulation to report crowding heterogeneities on reconstituted membranes and live cell membranes with nanometer spatial resolution. By quantifying the effective binding affinity of IgG monoclonal antibodies to engineered antigen sensors, we discover sharp gradients in crowding within a few nanometers of the crowded membrane surface. Our measurements on human cancer cells support the hypothesis that raft-like membrane domains exclude bulky membrane proteins and glycoproteins. Our facile and high-throughput method to quantify spatial crowding heterogeneities on live cell membranes may facilitate monoclonal antibody design and provide a mechanistic understanding of plasma membrane biophysical organization.
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Affiliation(s)
- Daniel P Arnold
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Yaxin Xu
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Sho C Takatori
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA, 93106, USA.
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6
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DuPont M, Visca H, Moshnikova A, Engelman DM, Reshetnyak YK, Andreev OA. Tumor treatment by pHLIP-targeted antigen delivery. Front Bioeng Biotechnol 2023; 10:1082290. [PMID: 36686229 PMCID: PMC9853002 DOI: 10.3389/fbioe.2022.1082290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Accepted: 12/12/2022] [Indexed: 01/09/2023] Open
Abstract
Targeted antigen delivery allows activation of the immune system to kill cancer cells. Here we report the targeted delivery of various epitopes, including a peptide, a small molecule, and a sugar, to tumors by pH Low Insertion Peptides (pHLIPs), which respond to surface acidity and insert to span the membranes of metabolically activated cancer and immune cells within tumors. Epitopes linked to the extracellular ends of pH Low Insertion Peptide peptides were positioned at the surfaces of tumor cells and were recognized by corresponding anti-epitope antibodies. Special attention was devoted to the targeted delivery of the nine residue HA peptide epitope from the Flu virus hemagglutinin. The HA sequence is not present in the human genome, and immunity is readily developed during viral infection or immunization with KLH-HA supplemented with adjuvants. We tested and refined a series of double-headed HA-pHLIP agents, where two HA epitopes were linked to a single pH Low Insertion Peptide peptide via two Peg12 or Peg24 polymers, which enable HA epitopes to engage both antibody binding sites. HA-epitopes positioned at the surfaces of tumor cells remain exposed to the extracellular space for 24-48 h and are then internalized. Different vaccination schemes and various adjuvants, including analogs of FDA approved adjuvants, were tested in mice and resulted in a high titer of anti-HA antibodies. Anti-HA antibody binds HA-pHLIP in blood and travels as a complex leading to significant tumor targeting with no accumulation in organs and to hepatic clearance. HA-pHLIP agents induced regression of 4T1 triple negative breast tumor and B16F10 MHC-I negative melanoma tumors in immunized mice. The therapeutic efficacy potentially is limited by the drop of the level of anti-HA antibodies in the blood to background level after three injections of HA-pHLIP. We hypothesize that additional boosts would be required to keep a high titer of anti-HA antibodies to enhance efficacy. pH Low Insertion Peptide-targeted antigen therapy may provide an opportunity to treat tumors unresponsive to T cell based therapies, having a small number of neo-antigens, or deficient in MHC-I presentation at the surfaces of cancer cells either alone or in combination with other approaches.
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Affiliation(s)
- Michael DuPont
- Physics Department, University of Rhode Island, Kingston, RI, United States
| | - Hannah Visca
- Physics Department, University of Rhode Island, Kingston, RI, United States
| | - Anna Moshnikova
- Physics Department, University of Rhode Island, Kingston, RI, United States
| | - Donald M. Engelman
- Department of Molecular Biophysics and Biochemistry, Yale, New Haven, CT, United States
| | - Yana K. Reshetnyak
- Physics Department, University of Rhode Island, Kingston, RI, United States
| | - Oleg A. Andreev
- Physics Department, University of Rhode Island, Kingston, RI, United States
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7
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Myres GJ, Kitt JP, Harris JM. Inter-Leaflet Phospholipid Exchange Impacts the Ligand Density Available for Protein Binding at Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6967-6976. [PMID: 35617691 DOI: 10.1021/acs.langmuir.2c00526] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Phospholipid bilayers formed at solid-liquid interfaces have garnered interest as mimics of cell membranes to model association reactions of proteins with lipid bilayer-tethered ligands. Despite the importance of understanding how ligand density in a lipid bilayer impacts the protein-ligand association response, relating the ligand-modified lipid fraction to the absolute density of solution-accessible ligands in a lipid bilayer remains a challenge in interfacial quantitative analysis. In this work, confocal Raman microscopy is employed to quantify the association of anti-biotin IgG with a small fraction of biotinylated lipids dispersed in either gel-phase or liquid-crystalline supported lipid bilayers deposited on the interior surfaces of wide-pore silica surfaces. We examine the question of whether inter-leaflet lipid translocation contributes to the population of solution-accessible biotin ligands on the distal leaflet of a supported lipid bilayer by comparing their protein accumulation response with ligands dispersed in lipid monolayers on nitrile-derivatized silica surfaces. The binding of the antibody to biotin ligands dispersed in gel-phase bilayers exhibited an equivalent biotin coverage response as the accumulation of IgG onto gel-phase monolayers, indicating that gel-phase bilayer symmetry was preserved. This result contrasts with the ∼60% greater anti-biotin capture observed at fluid-phase bilayers compared to fluid-phase monolayers prepared at equivalent biotin fractions. This enhanced protein capture is attributed to biotin-capped lipids being transferred from the surface-associated proximal leaflet of the bilayer to the solution-exposed distal leaflet by the inter-leaflet exchange or lipid flip-flop, a facile process in fluid-phase supported lipid bilayers. The results suggest caution in interpreting the results of quantitative studies of protein binding to lipid-tethered ligands dispersed in fluid-phase phospholipid bilayers.
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Affiliation(s)
- Grant J Myres
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
| | - Jay P Kitt
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
| | - Joel M Harris
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850, United States
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8
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Hribernik N, Chiodo F, Pieters R, Bernardi A. Rhamnose-based glycomimetic for recruitment of endogenous anti-rhamnose antibodies. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Patino Diaz A, Bracaglia S, Ranallo S, Patino T, Porchetta A, Ricci F. Programmable Cell-Free Transcriptional Switches for Antibody Detection. J Am Chem Soc 2022; 144:5820-5826. [PMID: 35316049 PMCID: PMC8990998 DOI: 10.1021/jacs.1c11706] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
![]()
We report here the
development of a cell-free in vitro transcription
system for the detection of specific target antibodies.
The approach is based on the use of programmable antigen-conjugated
DNA-based conformational switches that, upon binding to a target antibody,
can trigger the cell-free transcription of a light-up fluorescence-activating
RNA aptamer. The system couples the unique programmability and responsiveness
of DNA-based systems with the specificity and sensitivity offered
by in vitro genetic circuitries and commercially
available transcription kits. We demonstrate that cell-free transcriptional
switches can efficiently measure antibody levels directly in blood
serum. Thanks to the programmable nature of the sensing platform,
the method can be adapted to different antibodies: we demonstrate
here the sensitive, rapid, and cost-effective detection of three different
antibodies and the possible use of this approach for the simultaneous
detection of two antibodies in the same solution.
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Affiliation(s)
- Aitor Patino Diaz
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
| | - Sara Bracaglia
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
| | - Simona Ranallo
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
| | - Tania Patino
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
| | - Alessandro Porchetta
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
| | - Francesco Ricci
- Department of Chemistry, University of Rome, Tor Vergata, Via della Ricerca Scientifica, Rome 00133, Italy
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10
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Engelen W, Sigl C, Kadletz K, Willner EM, Dietz H. Antigen-Triggered Logic-Gating of DNA Nanodevices. J Am Chem Soc 2021; 143:21630-21636. [PMID: 34927433 PMCID: PMC8719334 DOI: 10.1021/jacs.1c09967] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
![]()
Synthetic nanoscale
devices that reconfigure dynamically in response
to physiological stimuli could offer new avenues for diagnostics and
therapy. Here, we report a strategy for controlling the state of DNA
nanodevices based on sensing antigens with IgG antibodies. To this
end, we use IgG antibodies as structural elements to kinetically trap
reconfigurable DNA origami structures in metastable states. Addition
of soluble antigens displace the IgGs from the objects and triggers
reconfiguration. We demonstrate this mechanism by antigen-triggered
disassembly of DNA origami shells for two different IgGs and their
cognate antigens, and we determined the corresponding dose response
curves. We also describe the logic-gated actuation of DNA objects
with combinations of antigens, as demonstrated with AND-type shells
that disassemble only when two different antigens are detected simultaneously.
We apply our system for the antigen-triggered release of molecular
payload as exemplified by the release of virus particles that we loaded
into the DNA origami shells. We expect our approach to be applicable
in many types of DNA nanostructures and with many other IgG-antigen
combinations.
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Affiliation(s)
- Wouter Engelen
- Laboratory for Biomolecular Nanotechnology, Physics Department, Technical University of Munich, Garching near Munich 85748, Germany.,Munich Institute of Biomedical Engineering, Technical University of Munich, Garching near Munich 85748, Germany
| | - Christian Sigl
- Laboratory for Biomolecular Nanotechnology, Physics Department, Technical University of Munich, Garching near Munich 85748, Germany.,Munich Institute of Biomedical Engineering, Technical University of Munich, Garching near Munich 85748, Germany
| | - Karoline Kadletz
- Laboratory for Biomolecular Nanotechnology, Physics Department, Technical University of Munich, Garching near Munich 85748, Germany.,Munich Institute of Biomedical Engineering, Technical University of Munich, Garching near Munich 85748, Germany
| | - Elena M Willner
- Laboratory for Biomolecular Nanotechnology, Physics Department, Technical University of Munich, Garching near Munich 85748, Germany.,Munich Institute of Biomedical Engineering, Technical University of Munich, Garching near Munich 85748, Germany
| | - Hendrik Dietz
- Laboratory for Biomolecular Nanotechnology, Physics Department, Technical University of Munich, Garching near Munich 85748, Germany.,Munich Institute of Biomedical Engineering, Technical University of Munich, Garching near Munich 85748, Germany
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11
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Domingues TM, Perez KR, Riske KA. Revealing the Mode of Action of Halictine Antimicrobial Peptides: A Comprehensive Study with Model Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:5145-5155. [PMID: 32336099 DOI: 10.1021/acs.langmuir.0c00282] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Antimicrobial peptides are innate host defense molecules with the ability to kill pathogens. They have been widely studied for their membrane lytic activity and their potential to overcome the ever-increasing threat of antimicrobial resistance against conventional antibiotics. Here, we focus on two halictines, antimicrobial peptides first obtained from the venom of the eusocial bee Halictus sexcinctus. The peptides, HAL-1 and HAL-2, are cationic (with +3 and +4 charges, respectively) and amphipathic, have 12 amino acid residues, and exhibit high biological activity. For this study, the mechanism of action of HAL-1 and HAL-2 was studied in detail using large and giant unilamellar vesicles composed of pure palmitoyl oleoyl phosphatidyl choline (POPC) and a mixture of POPC and the anionic lipid palmitoyl oleoyl phosphatidyl glycerol (POPG) as biomimetic models of the membranes of eukaryotes and microorganisms, respectively. A set of complementary techniques was put forward: carboxyfluorescein leakage assay, phase contrast optical microscopy, ζ-potential, static and dynamic light scattering, fluorescence and circular dichroism spectroscopies, and isothermal titration calorimetry. The results show that both halictines are able to interact strongly with anionic membranes: The interaction is exothermic and accompanied by structuring of the peptides as an α-helix and deep insertion into the membrane causing substantial membrane permeabilization at very low peptide/lipid molar ratios. Extensive vesicle aggregation was detected only at a high peptide concentration. On the other hand, the interaction of the halictines with POPC is significantly milder. Yet, the peptides were able to permeabilize the POPC membranes to some extent. Comparing both peptides, HAL-1 showed a somewhat stronger effect on model membranes. Fits to the data revealed apparent binding constants on the order of 103-104 M-1 for anionic membranes and 1 order of magnitude lower for zwitterionic bilayers. When lytic activity results were compared at the same bound peptide/lipid ratio, the halictines exhibited a higher activity toward zwitterionic membranes. As novel peptides, small and with powerful activity, these halictines are potential candidates for becoming antimicrobial agents.
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Affiliation(s)
- Tatiana M Domingues
- Departamento de Biofı́sica, Universidade Federal de São Paulo, São Paulo 04021-001, Brazil
| | - Katia R Perez
- Departamento de Biofı́sica, Universidade Federal de São Paulo, São Paulo 04021-001, Brazil
| | - Karin A Riske
- Departamento de Biofı́sica, Universidade Federal de São Paulo, São Paulo 04021-001, Brazil
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12
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Pinon L, Montel L, Mesdjian O, Bernard M, Michel A, Ménager C, Fattaccioli J. Kinetically Enhanced Fabrication of Homogeneous Biomimetic and Functional Emulsion Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:15319-15326. [PMID: 30507132 DOI: 10.1021/acs.langmuir.8b02721] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Characterized by a fluid and deformable interface, ligand-functionalized emulsion droplets are used as model probes to address biophysical, biological, and developmental questions. Functionalization protocols usually rely on the use of headgroup-modified phospholipids that are dissolved in the oil phase prior to emulsification, leading to a broad range of surface densities within a given droplet population. With the aim to coat particles homogeneously with biologically relevant lipids and proteins (streptavidin, immunoglobulins, etc.), we developed a reliable surface decoration protocol based on the use of polar cosolvents to dissolve the lipids in the aqueous phase after the droplet production. We show that the surface density of the lipids at the interface has a narrow normal distribution for droplets having the same size. We performed titration isotherms for lipids and biologically relevant proteins on these drops. Then, we studied the influence of the presence of surfactants in the medium on lipid insertion and compared the results for a range of polar cosolvents of increasing polarity. To assess both the generality and the biocompatibility of the method, we show that we can produce more sophisticated, monodisperse functional magnetic emulsions with a very high surface homogeneity. Using an oil denser than the surrounding culture medium, we show that IgG-coated droplets can be used as probes for phagocytosis experiments.
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Affiliation(s)
- L Pinon
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
- Institut Curie, PSL University, INSERM U932 , 26 rue d'Ulm , 75248 Paris Cedex 05 , France
| | - L Montel
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - O Mesdjian
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - M Bernard
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
- UMR 144, Institut Curie , 12 rue Lhomond , 75005 Paris , France
| | - A Michel
- Sorbonne Université, CNRS, Laboratoire Physicochimie des Électrolytes et Nanosystèmes Interfaciaux PHENIX , 4 place Jussieu , F-75005 Paris , France
| | - C Ménager
- Sorbonne Université, CNRS, Laboratoire Physicochimie des Électrolytes et Nanosystèmes Interfaciaux PHENIX , 4 place Jussieu , F-75005 Paris , France
| | - J Fattaccioli
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
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13
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Label-free Microarray-based Binding Affinity Constant Measurement with Modified Fluidic Arrangement. BIOCHIP JOURNAL 2018. [DOI: 10.1007/s13206-017-2102-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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14
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Bertucci A, Porchetta A, Ricci F. Antibody-Templated Assembly of an RNA Mimic of Green Fluorescent Protein. Anal Chem 2017; 90:1049-1053. [PMID: 29131585 DOI: 10.1021/acs.analchem.7b02102] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
One of the most intriguing ways through which nature achieves regulation of biological pathways encompasses the coordination of noncovalent interactions that bring biomolecules to be colocalized in a designated restricted space. Inspired by this mechanism, we have explored the possibility of using antibodies as bivalent biomolecular substrates for the templated assembly of a functional RNA structure. We have developed a biosupramolecular complementation assay by assembling a fluorescent Spinach aptamer, which is a synthetic RNA mimic of the Green Fluorescent Protein, from its split segments. We have employed two antigen-tagged RNA strands that, upon binding to the target antibody, are colocalized in a confined space and can reassemble into the native Spinach conformation, yielding a measurable fluorescence emission as a function of the templating antibody concentration. We have demonstrated the generality of our approach using two different antigen/antibody systems and found that both platforms show high binding affinity, specificity for the target antibody, and enough selectivity to work in crude cellular extracts. This study highlights the potential of biosupramolecular RNA engineering for the development of innovative biomimetic tools for nanobiotechnology and bioanalytical assays.
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Affiliation(s)
- Alessandro Bertucci
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata , Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Alessandro Porchetta
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata , Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Francesco Ricci
- Department of Chemical Sciences and Technologies, University of Rome Tor Vergata , Via della Ricerca Scientifica 1, 00133, Rome, Italy
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15
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Nagano M, Carrillo N, Otsubo N, Hakamata W, Ban H, Fuller RP, Bashiruddin NK, Barbas CF. In vivo programming of endogenous antibodies via oral administration of adaptor ligands. Bioorg Med Chem 2017; 25:5952-5961. [DOI: 10.1016/j.bmc.2017.09.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 08/24/2017] [Accepted: 09/08/2017] [Indexed: 01/03/2023]
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16
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Tran RJ, Sly KL, Conboy JC. Applications of Surface Second Harmonic Generation in Biological Sensing. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2017; 10:387-414. [PMID: 28301745 DOI: 10.1146/annurev-anchem-071015-041453] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface second harmonic generation (SHG) is a coherent, nonlinear optical technique that is well suited for investigations of biomolecular interactions at interfaces. SHG is surface specific due to the intrinsic symmetry constraints on the nonlinear process, providing a distinct analytical advantage over linear spectroscopic methods, such as fluorescence and UV-Visible absorbance spectroscopies. SHG has the ability to detect low concentrations of analytes, such as proteins, peptides, and small molecules, due to its high sensitivity, and the second harmonic response can be enhanced through the use of target molecules that are resonant with the incident (ω) and/or second harmonic (2ω) frequencies. This review describes the theoretical background of SHG, and then it discusses its sensitivity, limit of detection, and the implementation of the method. It also encompasses the applications of surface SHG directed at the study of protein-surface, small-molecule-surface, and nanoparticle-membrane interactions, as well as molecular chirality, imaging, and immunoassays. The versatility, high sensitivity, and surface specificity of SHG show great potential for developments in biosensors and bioassays.
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Affiliation(s)
- Renee J Tran
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
| | - Krystal L Sly
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
| | - John C Conboy
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112;
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17
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Rosa AMM, Prazeres DMF, Paulo PMR. Fluorescence correlation spectroscopy study of the complexation of DNA hybrids, IgG antibody, and a chimeric protein of IgG-binding ZZ domains fused with a carbohydrate binding module. Phys Chem Chem Phys 2017; 19:16606-16614. [DOI: 10.1039/c7cp00662d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Fluorescence correlation spectroscopy (FCS) was used to characterize the molecular interactions between the four components of a DNA recognition system.
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Affiliation(s)
- A. M. M. Rosa
- iBB – Institute for Bioengineering and Biosciences
- Department of Bioengineering
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisbon
| | - D. M. F. Prazeres
- iBB – Institute for Bioengineering and Biosciences
- Department of Bioengineering
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisbon
| | - P. M. R. Paulo
- Centro de Química Estrutural
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisbon
- Portugal
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18
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Wang M, Kussrow AK, Ocana MF, Chabot JR, Lepsy CS, Bornhop DJ, O'Hara DM. Physiologically relevant binding affinity quantification of monoclonal antibody PF-00547659 to mucosal addressin cell adhesion molecule for in vitro in vivo correlation. Br J Pharmacol 2016; 174:70-81. [PMID: 27760281 PMCID: PMC5221447 DOI: 10.1111/bph.13654] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 09/30/2016] [Accepted: 10/06/2016] [Indexed: 12/29/2022] Open
Abstract
Background and Purpose A monoclonal antibody (PF‐00547659) against mucosal addressin cell adhesion molecule (MAdCAM), expressed as both soluble (sMAdCAM) and trans‐membrane (mMAdCAM) target forms, showed over 30‐fold difference in antibody‐target KD between in vitro (Biacore) and clinically derived (KD,in‐vivo) values. Back‐scattering interferometry (BSI) was applied to acquire physiologically relevant KD values which were used to establish in vitro and in vivo correlation (IVIVC). Experimental Approach BSI was applied to obtain KD values between PF‐00547659 and recombinant human MAdCAM in buffer or CHO cells and endogenous MAdCAM in human serum or colon tissue. CHO cells and tissue were minimally processed to yield homogenate containing membrane vesicles and soluble proteins. A series of binding affinities in serum with various dilution factors was used to estimate both KD,in‐vivo and target concentrations; MAdCAM concentrations were also measured using LC–MS/MS. Key Results BSI measurements revealed low KD values (higher affinity) for sMAdCAM in buffer and serum, yet a 20‐fold higher KD value (lower affinity) for mMAdCAM in CHO, mMAdCAM and sMAdCAM in tissue. BSI predicted KD,in‐vivo in serum was similar to clinically derived KD,in‐vivo, and the BSI‐estimated serum sMAdCAM concentration also matched the measured concentration by LC–MS/MS. Conclusions and Implications Our results successfully demonstrated that BSI measurements of physiologically relevant KD values can be used to establish IVIVC, for PF‐00547659 to MAdCAM despite the lack of correlation when using Biacore measured KD and accurately estimates endogenous target concentrations. The application of BSI would greatly enhance successful basic pharmacological research and drug development.
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Affiliation(s)
- Mengmeng Wang
- Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc, Andover, MA, USA
| | - Amanda K Kussrow
- Department of Chemistry, Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, TN, USA
| | | | - Jeffrey R Chabot
- Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc, Andover, MA, USA
| | | | - Darryl J Bornhop
- Department of Chemistry, Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, TN, USA
| | - Denise M O'Hara
- Pharmacokinetics, Dynamics and Metabolism, Pfizer Inc, Andover, MA, USA
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19
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Tabaei SR, Guo F, Rutaganira FU, Vafaei S, Choong I, Shokat KM, Glenn JS, Cho NJ. Multistep Compositional Remodeling of Supported Lipid Membranes by Interfacially Active Phosphatidylinositol Kinases. Anal Chem 2016; 88:5042-5. [PMID: 27118725 PMCID: PMC5291064 DOI: 10.1021/acs.analchem.6b01293] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The multienzyme catalytic phosphorylation of phosphatidylinositol (PI) in a supported lipid membrane platform is demonstrated for the first time. One-step treatment with PI 4-kinase IIIβ (PI4Kβ) yielded PI 4-phosphate (PI4P), while a multistep enzymatic cascade of PI4Kβ followed by PIP 5-kinase produced PI-4,5-bisphosphate (PI(4,5)P2 or PIP2). By employing quartz crystal microbalance with dissipation monitoring, we were able to track membrane association of kinase enzymes for the first time as well as detect PI4P and PI(4,5)P2 generation based on subsequent antibody binding to the supported lipid bilayers. Pharmacologic inhibition of PI4Kβ by a small molecule inhibitor was also quantitatively assessed, yielding an EC50 value that agrees well with conventional biochemical readout. Taken together, the development of a PI-containing supported membrane platform coupled with surface-sensitive measurement techniques for kinase studies opens the door to exploring the rich biochemistry and pharmacological targeting of membrane-associated phosphoinositides.
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Affiliation(s)
- Seyed R. Tabaei
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Feng Guo
- Departments of Medicine, Division of Gastroenterology and Hepatology, and Microbiology & Immunology, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Florentine U. Rutaganira
- Howard Hughes Medical Institute, Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, California 94158-2280, United States
| | - Setareh Vafaei
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Ingrid Choong
- Departments of Medicine, Division of Gastroenterology and Hepatology, and Microbiology & Immunology, Stanford University School of Medicine, Stanford, California 94305, United States
| | - Kevan M. Shokat
- Howard Hughes Medical Institute, Department of Cellular and Molecular Pharmacology, University of California San Francisco, San Francisco, California 94158-2280, United States
| | - Jeffrey S. Glenn
- Departments of Medicine, Division of Gastroenterology and Hepatology, and Microbiology & Immunology, Stanford University School of Medicine, Stanford, California 94305, United States
- Palo Alto Veterans Administration Medical Center, Palo Alto, California 94304, United States
| | - Nam-Joon Cho
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
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20
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Glasgow MDK, Chougule MB. Recent Developments in Active Tumor Targeted Multifunctional Nanoparticles for Combination Chemotherapy in Cancer Treatment and Imaging. J Biomed Nanotechnol 2016; 11:1859-98. [PMID: 26554150 DOI: 10.1166/jbn.2015.2145] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nanotechnology and combination therapy are two major fields that show great promise in the treatment of cancer. The delivery of drugs via nanoparticles helps to improve drug's therapeutic effectiveness while reducing adverse side effects associated wifh high dosage by improving their pharmacokinetics. Taking advantage of molecular markers over-expressing on tumor tissues compared to normal cells, an "active" molecular marker targeted approach would be-beneficial for cancer therapy. These actively targeted nanoparticles would increase drug concentration at the tumor site, improving efficacy while further reducing chemo-resistance. The multidisciplinary approach may help to improve the overall efficacy in cancer therapy. This review article summarizes recent developments of targeted multifunctional nanoparticles in the delivery, of various drugs for a combinational chemotherapy approach to cancer treatment and imaging.
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21
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van Weerd J, Karperien M, Jonkheijm P. Supported Lipid Bilayers for the Generation of Dynamic Cell-Material Interfaces. Adv Healthc Mater 2015; 4:2743-79. [PMID: 26573989 DOI: 10.1002/adhm.201500398] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 08/03/2015] [Indexed: 12/13/2022]
Abstract
Supported lipid bilayers (SLB) offer unique possibilities for studying cellular membranes and have been used as a synthetic architecture to interact with cells. Here, the state-of-the-art in SLB-based technology is presented. The fabrication, analysis, characteristics and modification of SLBs are described in great detail. Numerous strategies to form SLBs on different substrates, and the means to patteren them, are described. The use of SLBs as model membranes for the study of membrane organization and membrane processes in vitro is highlighted. In addition, the use of SLBs as a substratum for cell analysis is presented, with discrimination between cell-cell and cell-extracellular matrix (ECM) mimicry. The study is concluded with a discussion of the potential for in vivo applications of SLBs.
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Affiliation(s)
- Jasper van Weerd
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
| | - Marcel Karperien
- Dept. of Developmental BioEngineering; MIRA Institute for Biomedical Technology and Technical Medicine; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
| | - Pascal Jonkheijm
- Bioinspired Molecular Engineering; University of Twente; PO Box 217 7500 AE Enschede The Netherlands
- Molecular Nanofabrication Group, MESA+; University of Twente; Enschede 7500 AE The Netherlands
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22
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Ranallo S, Rossetti M, Plaxco KW, Vallée-Bélisle A, Ricci F. A Modular, DNA-Based Beacon for Single-Step Fluorescence Detection of Antibodies and Other Proteins. Angew Chem Int Ed Engl 2015; 54:13214-8. [PMID: 26337144 PMCID: PMC4757636 DOI: 10.1002/anie.201505179] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 07/20/2015] [Indexed: 12/17/2022]
Abstract
A versatile platform for the one-step fluorescence detection of both monovalent and multivalent proteins has been developed. This system is based on a conformation-switching stem-loop DNA scaffold that presents a small-molecule, polypeptide, or nucleic-acid recognition element on each of its two stem strands. The steric strain associated with the binding of one (multivalent) or two (monovalent) target molecules to these elements opens the stem, enhancing the emission of an attached fluorophore/quencher pair. The sensors respond rapidly (<10 min) and selectively, enabling the facile detection of specific proteins even in complex samples, such as blood serum. The versatility of the platform was demonstrated by detecting five bivalent proteins (four antibodies and the chemokine platelet-derived growth factor) and two monovalent proteins (a Fab fragment and the transcription factor TBP) with low nanomolar detection limits and no detectable cross-reactivity.
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Affiliation(s)
- Simona Ranallo
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy)
| | - Marianna Rossetti
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy)
| | - Kevin W Plaxco
- Center for Bioengineering & Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106 (USA)
| | - Alexis Vallée-Bélisle
- Laboratory of Biosensors & Nanomachines, Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montréal, Québec H3C 3J7 (Canada).
| | - Francesco Ricci
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy).
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23
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Ranallo S, Rossetti M, Plaxco KW, Vallée‐Bélisle A, Ricci F. A Modular, DNA‐Based Beacon for Single‐Step Fluorescence Detection of Antibodies and Other Proteins. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505179] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Simona Ranallo
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy)
| | - Marianna Rossetti
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy)
| | - Kevin W. Plaxco
- Center for Bioengineering & Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106 (USA)
| | - Alexis Vallée‐Bélisle
- Laboratory of Biosensors & Nanomachines, Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre‐ville, Montréal, Québec H3C 3J7 (Canada)
| | - Francesco Ricci
- Dipartimento di Scienze e Tecnologie Chimiche, University of Rome Tor Vergata, Via della Ricerca Scientifica, Rome 00133 (Italy)
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24
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Liu C, Huang D, Yang T, Cremer PS. Simultaneous Detection of Multiple Proteins that Bind to the Identical Ligand in Supported Lipid Bilayers. Anal Chem 2015; 87:7163-70. [DOI: 10.1021/acs.analchem.5b00999] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Chunming Liu
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Da Huang
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
| | - Tinglu Yang
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
- Department
of Chemistry, Penn State University, University Park, Pennsylvania 16802, United States
| | - Paul S. Cremer
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77843, United States
- Department
of Chemistry, Penn State University, University Park, Pennsylvania 16802, United States
- Department
of Biochemistry and Molecular Biology, Penn State University, University Park, Pennsylvania 16802, United States
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25
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Shi X, Zhan W, Chen G, Yu Q, Liu Q, Du H, Cao L, Liu X, Yuan L, Chen H. Regulation of Protein Binding Capability of Surfaces via Host-Guest Interactions: Effects of Localized and Average Ligand Density. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6172-6178. [PMID: 25986051 DOI: 10.1021/acs.langmuir.5b01380] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The protein binding capability of biomaterial surfaces can significantly affect subsequent biological responses, and appropriate ligand presentation is often required to guarantee the best functions. Herein, a new facile method for regulating this capability by varying the localized and average ligand density is presented. Binding between lysine and plasminogen relevant to a fibrinolysis system was chosen as a model. We integrated different lysine-modified β-cyclodextrin (β-CD) derivatives onto bioinert copolymer brushes via host-guest interactions. The localized and average lysine density can be conveniently modulated by changing the lysine valency on β-CD scaffolds and by diluting lysine-persubstituted β-CD with pure β-CD, respectively. Both the plasminogen adsorption and the plasminogen binding affinity were enhanced by lysine-persubstituted β-CD compared with those of lysine-monosubstituted β-CD, which is possibly due to the higher localized lysine density and the multivalent binding of plasminogen on lysine-persubstituted β-CD surfaces. With a change in the ratio of lysine-persubstituted β-CD to β-CD, the average lysine density can be tuned, leading to the linear regulation of the adsorption of plasminogen on surfaces.
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Affiliation(s)
- Xiujuan Shi
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Wenjun Zhan
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Gaojian Chen
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
- ‡Center for Soft Condensed Matter Physics and Interdisciplinary Research, Soochow University, Suzhou 215006, P. R. China
| | - Qian Yu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Qi Liu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Hui Du
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Limin Cao
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Xiaoli Liu
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Lin Yuan
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Hong Chen
- †College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
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26
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Sheridan RTC, Hudon J, Hank JA, Sondel PM, Kiessling LL. Rhamnose glycoconjugates for the recruitment of endogenous anti-carbohydrate antibodies to tumor cells. Chembiochem 2014; 15:1393-8. [PMID: 24909955 PMCID: PMC4205123 DOI: 10.1002/cbic.201402019] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Indexed: 12/12/2022]
Abstract
Immunotherapy is a promising strategy for targeting tumors. One emerging approach is to harness the immune effector functions of natural antibodies to destroy tumor cells. Dinitrophenyl (DNP) and the galactose-α-1,3-galactose (αGal) epitope are two haptens that bind endogenous antibodies. One potential alternative is the deoxysugar L-rhamnose. We compared these candidates by using a biosensor assay to evaluate human sera for endogenous antibody concentration, antibody isotype distribution, and longevity of antibody-hapten interactions. Antibodies recognizing α-rhamnose are of equal or greater abundance and affinity as those recognizing αGal. Moreover, both rhamnose and αGal epitopes are more effective than DNP at recruiting the IgG antibody subtype. Exposure of tumor cells to rhamnose-bearing glycolipids and human serum promotes complement-mediated cytotoxicity. These data highlight the utility of α-rhamnose-containing glycoconjugates to direct the immune system to target cells.
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Affiliation(s)
| | - Jonathan Hudon
- Department of Chemistry, UW-Madison, 1101 University Ave., Madison, WI 53706
| | - Jacquelyn A. Hank
- Department of Human Oncology, UW-Madison, 1111 Highland Ave., Madison, WI 53705
| | - Paul M. Sondel
- Department of Human Oncology, UW-Madison, 1111 Highland Ave., Madison, WI 53705
| | - Laura L. Kiessling
- Department of Biochemistry, UW-Madison, 433 Babcock Dr., Madison, WI 53706
- Department of Chemistry, UW-Madison, 1101 University Ave., Madison, WI 53706
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27
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28
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Li JR, Shi L, Deng Z, Lo SH, Liu GY. Nanostructures of designed geometry and functionality enable regulation of cellular signaling processes. Biochemistry 2012; 51:5876-93. [PMID: 22783801 PMCID: PMC4041195 DOI: 10.1021/bi200880p] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Extracellular matrices (ECM) triggered cellular signaling processes often begin with the clustering of the cellular receptors such as integrin and FcεRI. The sizes of these initial protein complexes or clusters are tens to 100 nm in dimension; therefore, engineered nanostructures could provide effective mimics of ECM for investigation and control of the initial and downstream specific signaling processes. This current topic discusses recent advances in nanotechnology in the context of design and production of matching chemical functionality and geometry for control of specific cellular signaling processes. Two investigations are reported to demonstrate this concept: (a) how the presentation of antigen at the nanometer scale would influence the aggregation of FcεRI, which would impact the formation of activation complexes, leading to the rearrangement of actin in cytoskeleton and degranulation or activation of mast cells; (b) how the engineered nanostructure could guide the initial integrin clustering, which would impact the formation of focal adhesion and downstream cell signaling cascades, leading to polarization, migration, and morphological changes. Complementary to engineered ECMs using synthetic ligands or peptides, or topographic control at the micrometer scale, nanostructures of designed geometry and chemical functionality provide new and effective biochemical cues for regulation of cellular signaling processes and downstream behaviors.
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Affiliation(s)
- Jie-Ren Li
- Department of Chemistry, University of California, Davis, California 95616
| | - Lifang Shi
- Department of Chemistry, University of California, Davis, California 95616
| | - Zhao Deng
- Department of Chemistry, University of California, Davis, California 95616
| | - Su Hao Lo
- Department of Biochemistry and Molecular Medicine, Center for Tissue Regeneration and Repair, University of California-Davis, Medical Center, Sacramento, California 95817
| | - Gang-yu Liu
- Department of Chemistry, University of California, Davis, California 95616
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29
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Landry JP, Fei Y, Zhu X. Simultaneous measurement of 10,000 protein-ligand affinity constants using microarray-based kinetic constant assays. Assay Drug Dev Technol 2011; 10:250-9. [PMID: 22192305 DOI: 10.1089/adt.2011.0406] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Fluorescence-based endpoint detection of microarrays with 10,000 or more molecular targets is a most useful tool for high-throughput profiling of biomolecular interactions, including screening large molecular libraries for novel protein ligands. However, endpoint fluorescence data such as images of reacted microarrays contain little information on kinetic rate constants, and the reliability of endpoint data as measures of binding affinity depends on reaction conditions and postreaction processing. We here report a simultaneous measurement of binding curves of a protein probe with 10,000 molecular targets in a microarray with an ellipsometry-based (label-free) optical scanner. The reaction rate constants extracted from these curves (k(on), k(off), and k(a)=k(on)/k(off)) are used to characterize the probe-target interactions instead of the endpoints. This work advances the microarray technology to a new milestone, namely, from an endpoint assay to a kinetic constant assay platform. The throughput of this binding curve assay platform is comparable to those at the National Institutes of Health Molecular Library Screening Centers, making it a practical method in screening compound libraries for novel ligands and for system-wide affinity profiling of proteins, viruses, or whole cells against diverse molecular targets.
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Affiliation(s)
- James P Landry
- Department of Physics, University of California at Davis, Davis, CA 95616, USA
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30
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Navaratnarajah P, Steele BL, Redinbo MR, Thompson NL. Rifampicin-independent interactions between the pregnane X receptor ligand binding domain and peptide fragments of coactivator and corepressor proteins. Biochemistry 2011; 51:19-31. [PMID: 22185585 DOI: 10.1021/bi2011674] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The pregnane X receptor (PXR), a member of the nuclear receptor superfamily, regulates the expression of drug-metabolizing enzymes in a ligand-dependent manner. The conventional view of nuclear receptor action is that ligand binding enhances the receptor's affinity for coactivator proteins, while decreasing its affinity for corepressors. To date, however, no known rigorous biophysical studies have been conducted to investigate the interaction among PXR, its coregulators, and ligands. In this work, steady-state total internal reflection fluorescence microscopy (TIRFM) and total internal reflection with fluorescence recovery after photobleaching were used to measure the thermodynamics and kinetics of the interaction between the PXR ligand binding domain and a peptide fragment of the steroid receptor coactivator-1 (SRC-1) in the presence and absence of the established PXR agonist, rifampicin. Equilibrium dissociation and dissociation rate constants of ~5 μM and ~2 s(-1), respectively, were obtained in the presence and absence of rifampicin, indicating that the ligand does not enhance the affinity of the PXR and SRC-1 fragments. Additionally, TIRFM was used to examine the interaction between PXR and a peptide fragment of the corepressor protein, the silencing mediator for retinoid and thyroid receptors (SMRT). An equilibrium dissociation constant of ~70 μM was obtained for SMRT in the presence and absence of rifampicin. These results strongly suggest that the mechanism of ligand-dependent activation in PXR differs significantly from that seen in many other nuclear receptors.
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Affiliation(s)
- Punya Navaratnarajah
- Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599-7260, United States
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31
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Nguyen TT, Sly KL, Conboy JC. Comparison of the Energetics of Avidin, Streptavidin, NeutrAvidin, and Anti-Biotin Antibody Binding to Biotinylated Lipid Bilayer Examined by Second-Harmonic Generation. Anal Chem 2011; 84:201-8. [DOI: 10.1021/ac202375n] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Trang T. Nguyen
- Department of Chemistry, University of Utah, 315 South
1400 East, Rm. 2020, Salt Lake City, Utah 84112, United States
| | - Krystal L. Sly
- Department of Chemistry, University of Utah, 315 South
1400 East, Rm. 2020, Salt Lake City, Utah 84112, United States
| | - John C. Conboy
- Department of Chemistry, University of Utah, 315 South
1400 East, Rm. 2020, Salt Lake City, Utah 84112, United States
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32
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Deng Z, Weng IC, Li JR, Chen HY, Liu FT, Liu GY. Engineered nanostructures of antigen provide an effective means for regulating mast cell activation. ACS NANO 2011; 5:8672-83. [PMID: 21999491 PMCID: PMC3228856 DOI: 10.1021/nn202510n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Nanostructures containing 2,4-dinitrophenyl (DNP) as antigen were designed and produced to investigate antibody-mediated activation of mast cells. The design consists of nanogrids of DNP termini inlaid in alkanethiol self-assembled monolayers (SAMs). Using scanning probe-based nanografting, nanometer precision was attained for designed geometry, size, and periodicity. Rat basophilic leukemia (RBL) cells exhibited high sensitivity to the geometry and local environment of DNP presented on these nanostructures. The impact included cellular adherence, spreading, membrane morphology, cytoskeleton structure, and activation. The highest level of spreading and activation was induced by nanogrids of 17 nm line width and 40 nm periodicity, with DNP haptens 1.4 nm above the surroundings. The high efficacy is attributed to two main factors. First, DNP sites in the nanostructure are highly accessible by anti-DNP IgE during recognition. Second, the arrangement or geometry of DNP termini in nanostructures promotes clustering of FcεRI receptors that are prelinked to IgE. The clustering effectively initiates Lyn-mediated signaling cascades, ultimately leading to the degranulation of RBL cells. This work demonstrates an important concept: that nanostructures of ligands provide new and effective cues for directing cellular signaling processes.
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Affiliation(s)
- Zhao Deng
- Department of Chemistry, University of California, Davis, CA 95616
| | - I-Chun Weng
- Department of Dermatology, School of Medicine, Sacramento, University of California at Davis, CA 95817
- Institute of Biomedical Sciences, Academia Sinica, Taiwan, ROC
| | - Jie-Ren Li
- Department of Chemistry, University of California, Davis, CA 95616
| | - Huan-Yuan Chen
- Department of Dermatology, School of Medicine, Sacramento, University of California at Davis, CA 95817
- Institute of Biomedical Sciences, Academia Sinica, Taiwan, ROC
| | - Fu-Tong Liu
- Department of Dermatology, School of Medicine, Sacramento, University of California at Davis, CA 95817
- Institute of Biomedical Sciences, Academia Sinica, Taiwan, ROC
- Author to whom correspondence should be addressed: Phone: (530) 754-9678: Fax: (530) 754-8557
| | - Gang-yu Liu
- Department of Chemistry, University of California, Davis, CA 95616
- Author to whom correspondence should be addressed: Phone: (530) 754-9678: Fax: (530) 754-8557
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33
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Müller MK, Petkau K, Brunsveld L. Proteinassembly along a supramolecular wire. Chem Commun (Camb) 2011; 47:310-2. [DOI: 10.1039/c0cc02084b] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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34
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Kataoka-Hamai C, Higuchi M, Iwai H, Miyahara Y. Detergent-mediated formation of polymer-supported phospholipid bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:14600-14605. [PMID: 20726608 DOI: 10.1021/la102151p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Supported phospholipid bilayers can be formed by established methods such as vesicle fusion and the Langmuir-Blodgett (LB) technique. However, challenges remain in regards to creating supported bilayers from various lipid compositions, using various support surfaces, and incorporating membrane proteins. Here we report a detergent removal method as an alternative means of supported bilayer formation. The process consists of three steps: (1) incubation of phospholipid-poly(ethylene glycol) (PEG)-grafted glass with lipid-detergent micelles; (2) detergent removal by washing the surface with vesicles; and (3) incubation with the vesicles to complete lipid adsorption. These procedures yielded fluid planar bilayers of zwitterionic lipids. Because fluid structures were not obtained by vesicle fusion, the detergent seemed necessary to produce the polymer-supported bilayers. While anionic phospholipids inhibited the attachment of fluid bilayers in the absence of calcium ions, supported bilayers with almost full mobility were obtained from lipid mixtures containing 10-20 mol % anionic lipids in the presence of calcium ions. The incorporation of the anionic lipids in the bulk-facing leaflet was demonstrated by the binding of dye-labeled annexin V.
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Affiliation(s)
- Chiho Kataoka-Hamai
- Biomaterials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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35
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Shi J, Votruba AR, Farokhzad OC, Langer R. Nanotechnology in drug delivery and tissue engineering: from discovery to applications. NANO LETTERS 2010; 10:3223-30. [PMID: 20726522 PMCID: PMC2935937 DOI: 10.1021/nl102184c] [Citation(s) in RCA: 957] [Impact Index Per Article: 68.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The application of nanotechnology in medicine, referred to as nanomedicine, is offering numerous exciting possibilities in healthcare. Herein, we discuss two important aspects of nanomedicine, drug delivery and tissue engineering, highlighting the advances we have recently experienced, the challenges we are currently facing, and what we are likely to witness in the near future.
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Affiliation(s)
- Jinjun Shi
- MIT-Harvard Center for Cancer Nanotechnology Excellence, Cambridge, Massachusetts, 02139
- Laboratory of Nanomedicine and Biomaterials, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, 02115
| | - Alexander R. Votruba
- Laboratory of Nanomedicine and Biomaterials, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, 02115
| | - Omid C. Farokhzad
- MIT-Harvard Center for Cancer Nanotechnology Excellence, Cambridge, Massachusetts, 02139
- Laboratory of Nanomedicine and Biomaterials, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, 02115
| | - Robert Langer
- MIT-Harvard Center for Cancer Nanotechnology Excellence, Cambridge, Massachusetts, 02139
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, 02139
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36
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Kataoka-Hamai C, Miyahara Y. Field-effect detection using phospholipid membranes. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:033001. [PMID: 27877335 PMCID: PMC5074296 DOI: 10.1088/1468-6996/11/3/033001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 07/15/2010] [Accepted: 06/20/2010] [Indexed: 05/22/2023]
Abstract
The application of field-effect devices to biosensors has become an area of intense research interest. An attractive feature of field-effect sensing is that the binding or reaction of biomolecules can be directly detected from a change in electrical signals. The integration of such field-effect devices into cell membrane mimics may lead to the development of biosensors useful in clinical and biotechnological applications. This review summarizes recent studies on the fabrication and characterization of field-effect devices incorporating model membranes. The incorporation of black lipid membranes and supported lipid monolayers and bilayers into semiconductor devices is described.
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Affiliation(s)
- Chiho Kataoka-Hamai
- Biomaterials Center and International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
- CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan
| | - Yuji Miyahara
- Biomaterials Center and International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
- CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan
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37
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Scheibe P, Barz M, Hemmelmann M, Zentel R. Langmuir-Blodgett films of biocompatible poly(HPMA)-block-poly(lauryl methacrylate) and poly(HPMA)-random-poly(lauryl methacrylate): influence of polymer structure on membrane formation and stability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5661-5669. [PMID: 20345113 DOI: 10.1021/la903725k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Membranes based on functional biocompatible polymers can be regarded as a useful model system to study biological interactions, e.g. antibody-antigen interactions or protein polymer interactions. These model systems may give a better insight into these processes and may help to find suitable polymeric structures offering biocompatibility as well as reduced polymer protein interaction. In this respect, Langmuir-Blodgett (LB) layer formation at the air/water (A/W) interface is studied in respect to polymer architecture in this article. For this purpose, narrowly distributed N-(2-hydroxypropyl)-methacrylamide (HPMA) random and block copolymers have been prepared by the RAFT polymerization method. For random copolymers different molecular weights were prepared. As for the block copolymers also the ratio of hydrophilic and hydrophobic units was varied in order to study the influence of hydrophobic block length on collapse pressure and area. The molecular weights of all polymers were around 15 kDa and 30 kDa. In the case of block copolymers we found a direct correlation of the length of the hydrophobic block to the collapse area. Furthermore, hysteresis experiments clearly point out that block copolymers form stable LB layers. No remarkable changes in collapse pressure or area could be observed. In contrast the area occupied by random copolymers changes at each hysteresis cycle indicating a loss of polymer to the aqueous subphase. In addition the LB layers were transferred onto mica substrates. The block copolymers formed stable and defect free membranes over an area of 100 microm(2) with a roughness (rms) 1.3-1.4 A. On the contrary, membranes based on random copolymers turned out to have a higher surface roughness. Our findings clearly underline the influence of polymer structure on the LB layer formation at the A/W interface.
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Affiliation(s)
- Patrick Scheibe
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
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38
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Tamarit-López J, Morais S, Bañuls MJ, Puchades R, Maquieira Á. Development of Hapten-Linked Microimmunoassays on Polycarbonate Discs. Anal Chem 2010; 82:1954-63. [DOI: 10.1021/ac902706t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jesús Tamarit-López
- Departamento de Química, Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Universidad Politécnica de Valencia, Camino de Vera s/n, 46071 Valencia, Spain
| | - Sergi Morais
- Departamento de Química, Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Universidad Politécnica de Valencia, Camino de Vera s/n, 46071 Valencia, Spain
| | - María-José Bañuls
- Departamento de Química, Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Universidad Politécnica de Valencia, Camino de Vera s/n, 46071 Valencia, Spain
| | - Rosa Puchades
- Departamento de Química, Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Universidad Politécnica de Valencia, Camino de Vera s/n, 46071 Valencia, Spain
| | - Ángel Maquieira
- Departamento de Química, Instituto de Reconocimiento Molecular y Desarrollo Tecnológico, Universidad Politécnica de Valencia, Camino de Vera s/n, 46071 Valencia, Spain
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39
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Liem KP, Noble GT, Flitsch SL, Webb SJ. The effect of multivalent binding on the lateral phase separation of adhesive lipids. Faraday Discuss 2010. [DOI: 10.1039/b907114h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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40
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Gupta G, Rathod SB, Staggs KW, Ista LK, Abbou Oucherif K, Atanassov PB, Tartis MS, Montaño GA, López GP. CVD for the facile synthesis of hybrid nanobiomaterials integrating functional supramolecular assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13322-13327. [PMID: 19883092 DOI: 10.1021/la903475d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this letter, we present a simple one-step, versatile, scalable chemical vapor deposition (CVD)-based process for the encapsulation and stabilization of a host of single or multicomponent supramolecular assemblies (proteoliposomes, microbubbles, lipid bilayers, and photosynthetic antennae complexes and other biological materials) to form functional hybrid nanobiomaterials. In each case, it is possible (i) to form thin silica layers or gels controllably that enable the preservation of the supramolecular assembly over time and under adverse environmental conditions and (ii) to tune the structure of the silica gels so as to optimize solute accessibility while at the same time preserving functional dynamic properties of the encapsulated phospholipid assembly. The process allows precise temporal and spatial control of silica polymerization kinetics through the control of precursor delivery at room temperature and does not require or produce high concentrations of injurious chemicals that can compromise the function of biomolecular assemblies; it also does not require additives. This process differs from the conventional sol-gel process in that it does not involve the use of cosolvents (alcohols) and catalysts (acid or base).
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Affiliation(s)
- Gautam Gupta
- Center for Biomedical Engineering and Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
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41
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Patel AR, Kanazawa KK, Frank CW. Antibody Binding to a Tethered Vesicle Assembly Using QCM-D. Anal Chem 2009; 81:6021-9. [DOI: 10.1021/ac802756v] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ankit R. Patel
- Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stauffer III, Stanford, California 94305-5025
| | - Kay K. Kanazawa
- Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stauffer III, Stanford, California 94305-5025
| | - Curtis W. Frank
- Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stauffer III, Stanford, California 94305-5025
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42
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Jung H, Robison AD, Cremer PS. Multivalent ligand-receptor binding on supported lipid bilayers. J Struct Biol 2009; 168:90-4. [PMID: 19508894 DOI: 10.1016/j.jsb.2009.05.010] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 04/22/2009] [Accepted: 05/27/2009] [Indexed: 11/27/2022]
Abstract
Fluid supported lipid bilayers provide an excellent platform for studying multivalent protein-ligand interactions because the two-dimensional fluidity of the membrane allows for lateral rearrangement of ligands in order to optimize binding. Our laboratory has combined supported lipid bilayer-coated microfluidic platforms with total internal reflection fluorescence microscopy (TIRFM) to obtain equilibrium dissociation constant (K(D)) data for these systems. This high throughput, on-chip approach provides highly accurate thermodynamic information about multivalent binding events while requiring only very small sample volumes. Herein, we review some of the most salient findings from these studies. In particular, increasing ligand density on the membrane surface can provide a modest enhancement or attenuation of ligand-receptor binding depending upon whether the surface ligands interact strongly with each other. Such effects, however, lead to little more than one order of magnitude change in the apparent K(D) values. On the other hand, the lipophilicity and presentation of lipid bilayer-conjugated ligands can have a much greater impact. Indeed, changing the way a particular ligand is conjugated to the membrane can alter the apparent K(D) value by at least three orders of magnitude. Such a result speaks strongly to the role of ligand availability for multivalent ligand-receptor binding.
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Affiliation(s)
- Hyunsook Jung
- Department of Chemistry, Texas A&M University, College Station, 77843-3012, USA
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43
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Jung H, Robison AD, Cremer PS. Detecting protein-ligand binding on supported bilayers by local pH modulation. J Am Chem Soc 2009; 131:1006-14. [PMID: 19125648 PMCID: PMC3195364 DOI: 10.1021/ja804542p] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we describe a highly sensitive technique for detecting protein-ligand binding at the liquid/solid interface. The method is based upon modulation of the interfacial pH when the protein binds. This change is detected by ortho-Texas Red DHPE, which is doped into supported phospholipid bilayers and used as a pH-sensitive dye. The dye molecule fluoresces strongly at acidic pH values but not basic ones and has an apparent pK(A) of 7.8 in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine membranes containing 0.5 mol % biotin-cap-PE. This method was used to detect antibiotin/biotin binding interactions as well as the binding of cholera toxin B subunits to GM(1). Since these proteins are negatively charged under the conditions of the experiment the interface became slightly more acidic upon binding. In each case, the equilibrium dissociation constant was determined by following the rise in fluorescence as protein was introduced. This change is essentially linear with protein coverage under the conditions employed. For the biotin/antibiotin system it was determined that K(D) = 24 +/- 5 nM, which is in excellent agreement with classical measurements made by total internal reflection fluorescence microscopy involving fluorophore-conjugated antibody molecules. Moreover, the limit of detection was approximately 350 fM at the 99% confidence level. This corresponds to 1 part in 69,000 of the K(D) value. Such a finding compares favorably with surface plasmon resonance studies of similar systems and conditions. The assay could be run in imaging mode to obtain multiple simultaneous measurements using a CCD camera.
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Affiliation(s)
- Hyunsook Jung
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012
| | - Aaron D. Robison
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012
| | - Paul S. Cremer
- Contribution from the Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77843-3012
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44
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Noble GT, Flitsch SL, Liem KP, Webb SJ. Assessing the cluster glycoside effect during the binding of concanavalin A to mannosylated artificial lipid rafts. Org Biomol Chem 2009; 7:5245-54. [DOI: 10.1039/b910976e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Tan YH, Liu M, Nolting B, Go JG, Gervay-Hague J, Liu GY. A nanoengineering approach for investigation and regulation of protein immobilization. ACS NANO 2008; 2:2374-84. [PMID: 19206405 PMCID: PMC4512660 DOI: 10.1021/nn800508f] [Citation(s) in RCA: 183] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
It is known that protein attachment to surfaces depends sensitively upon the local structure and environment of the binding sites at the nanometer scale. Using nanografting and reversal nanografting, both atomic force microscopy (AFM)-based lithography techniques, protein binding sites with well-defined local environments are designed and engineered with nanometer precision. Three proteins, goat antibiotin immunoglobulin G (IgG), lysozyme, and rabbit immunoglobulin G, are immobilized onto these engineered surfaces. Strong dependence on the dimension and spatial distribution of protein binding sites are revealed in antibody recognition, covalent attachment via primary amine residues and surface-bound aldehyde groups. This investigation indicates that AFM-based nanolithography enables the production of protein nanostructures, and more importantly, protein-surface interactions at a molecular level can be regulated by changing the binding domains and their local environment at nanometer scale.
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Affiliation(s)
- Yih Horng Tan
- Department of Chemistry, University of California, Davis, CA 95616
| | - Maozi Liu
- Department of Chemistry, University of California, Davis, CA 95616
| | - Birte Nolting
- Department of Chemistry, University of California, Davis, CA 95616
| | - Joan G. Go
- Department of Chemistry, University of California, Davis, CA 95616
| | | | - Gang-yu Liu
- Department of Chemistry, University of California, Davis, CA 95616
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46
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Shi J, Yang T, Cremer PS. Multiplexing ligand-receptor binding measurements by chemically patterning microfluidic channels. Anal Chem 2008; 80:6078-84. [PMID: 18570383 PMCID: PMC3449174 DOI: 10.1021/ac800912f] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A method has been designed for patterning supported phospholipid bilayers (SLBs) on planar substrates and inside microfluidic channels. To do this, bovine serum albumin (BSA) monolayers were formed via adsorption at the liquid/solid interface. Next, this interfacial protein film was selectively patterned by using deep UV lithography. Subsequently, SLBs could be deposited in the patterned locations by vesicle fusion. By cycling through this process several times, spatially addressed bilayer arrays could be formed with intervening protein molecules serving as two-dimensional corrals. By employing this method, phospholipid bilayers containing various concentrations of ganglioside GM1 were addressed along the length of individual microfluidic channels. Therefore, the binding of GM1 with pentameric cholera toxin B (CTB) subunits could be probed. A seven-channel microfluidic device was fabricated for this purpose. Each channel was simultaneously patterned with four chemically distinct SLBs containing 0, 0.2, 0.5, and 2.0 mol % GM1, respectively. Varying concentrations of CTB were then introduced into each of the channels. With the use of total internal reflection fluorescence microscopy, it was possible to simultaneously abstract multiple equilibrium dissociation constants as a function of ligand density for the CTB-GM1 system in a single shot.
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Affiliation(s)
- Jinjun Shi
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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