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Bak M, Jølck RI, Eliasen R, Andresen TL. Affinity Induced Surface Functionalization of Liposomes Using Cu-Free Click Chemistry. Bioconjug Chem 2016; 27:1673-80. [PMID: 27269516 DOI: 10.1021/acs.bioconjchem.6b00221] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Functionalization of nanoparticles is a key element for improving specificity of drug delivery systems toward diseased tissue or cells. In the current study we report a highly efficient and chemoselective method for post-functionalization of liposomes with biomacromolecules, which equally well can be used for functionalization of other nanoparticles or solid surfaces. The method exploits a synergistic effect of having both affinity and covalent anchoring tags on the surface of the liposome. This was achieved by synthesizing a peptide linker system that uses Cu-free strain-promoted click chemistry in combination with histidine affinity tags. The investigation of post-functionalization of PEGylated liposomes was performed with a cyclic RGDfE peptide. By exploring both affinity and covalent tags a 98 ± 2.0% coupling efficiency was achieved, even a diluted system showed a coupling efficiency of 87 ± 0.2%. The reaction kinetics and overall yield were quantified by HPLC. The results presented here open new possibilities for constructing complex nanostructures and functionalized surfaces.
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Affiliation(s)
- Martin Bak
- Department of Micro- and Nanotechnology, DTU Nanotech, Center for Nanomedicine and Theranostics, Technical University of Denmark , Building 423, Lyngby DK-2800, Denmark
| | - Rasmus I Jølck
- Department of Micro- and Nanotechnology, DTU Nanotech, Center for Nanomedicine and Theranostics, Technical University of Denmark , Building 423, Lyngby DK-2800, Denmark
| | - Rasmus Eliasen
- Department of Micro- and Nanotechnology, DTU Nanotech, Center for Nanomedicine and Theranostics, Technical University of Denmark , Building 423, Lyngby DK-2800, Denmark
| | - Thomas L Andresen
- Department of Micro- and Nanotechnology, DTU Nanotech, Center for Nanomedicine and Theranostics, Technical University of Denmark , Building 423, Lyngby DK-2800, Denmark
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2
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Ning W, Wijeratne S, Dong J, Bruening ML. Immobilization of carboxymethylated polyethylenimine-metal-ion complexes in porous membranes to selectively capture his-tagged protein. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2575-84. [PMID: 25574836 DOI: 10.1021/am507607j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Membrane adsorbers rapidly capture tagged proteins because flow through membrane pores efficiently conveys proteins to binding sites. Effective adsorbers, however, require membrane pores coated with thin films that bind multilayers of proteins. This work employs adsorption of polyelectrolytes that chelate metal ions to create functionalized membranes that selectively capture polyhistidine-tagged (His-tagged) proteins with binding capacities equal to those of high-binding commercial beads. Adsorption of functional polyelectrolytes is simpler than previous membrane-modification strategies such as growth of polymer brushes or derivatization of adsorbed layers with chelating moieties. Sequential adsorption of protonated poly(allylamine) (PAH) and carboxymethylated branched polyethylenimine (CMPEI) leads to membranes that bind Ni(2+) and capture ∼60 mg of His-tagged ubiquitin per mL of membrane. Moreover, these membranes enable isolation of His-tagged protein from cell lysates in <15 min. The backbone amine groups in CMPEI likely increase swelling in water to double protein binding compared to films composed of PAH and the chelating polymer poly[(N,N-dicarboxymethyl)allylamine] (PDCMAA), which has a hydrocarbon backbone. Metal leaching from PAH/CMPEI- and PAH/PDCMAA-modified membranes is similar to that from GE Hitrap FF columns. Eluates with 0.5 M imidazole contain <10 ppm of Ni(2+).
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Affiliation(s)
- Wenjing Ning
- Department of Chemistry, Michigan State University , East Lansing, Michigan 48824, United States
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3
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Sista P, Ghosh K, Martinez JS, Rocha RC. Metallo-Biopolymers: Conjugation Strategies and Applications. POLYM REV 2014. [DOI: 10.1080/15583724.2014.913063] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Wijeratne S, Bruening ML, Baker GL. Layer-by-layer assembly of thick, Cu(2+)-chelating films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12720-9. [PMID: 24044576 PMCID: PMC3873220 DOI: 10.1021/la402633x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Layer-by-layer adsorption of protonated poly(allylamine) (PAH) and deprotonated poly(N,N-dicarboxymethylallylamine) (PDCMAA) yields thick films with a high density of iminodiacetic acid (IDA) ligands that bind metal ions. When film deposition occurs at pH 3.0, PAH/PDCMAA bilayer thicknesses reach 200 nm, and Cu(2+) binding capacities are ~2.5 mmol per cm(3) of film. (PAH/PDCMAA)10 films deposited at pH 3.0 are 4-8-fold thicker than films formed at pH 5.0, 7.0, or 9.0, presumably because of the low charge density on PDCMAA chains at pH 3.0. However, with normalization to film thickness, all films bind similar amounts of Cu(2+) from pH 4.1 solutions of CuSO4. In micrometer-thick films, equilibration of binding sites with Cu(2+) requires ~4 h due to a low Cu(2+) diffusion coefficient (~2.6 × 10(-12) cm(2)/s). Sorption isotherms determined at several temperatures show that Cu(2+) binding is endothermic with a positive entropy (binding constants increase with increasing temperature), presumably because metal-ion complexation involves displacement of both a proton from IDA and water molecules from Cu(2+). (PAH/PDCMAA)10 films retain their binding capacity over four absorption/elution cycles and may prove useful in metal-ion scavenging, catalysis, and protein binding.
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Affiliation(s)
- Salinda Wijeratne
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
| | - Merlin L. Bruening
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
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Mikuła E, Sulima M, Marszałek I, Wysłouch-Cieszyńska A, Verwilst P, Dehaen W, Radecki J, Radecka H. Oriented immobilization of His-tagged protein on a redox active thiol derivative of DPTA-Cu(II) layer deposited on a gold electrode--the base of electrochemical biosensors. SENSORS 2013; 13:11586-602. [PMID: 24005034 PMCID: PMC3821307 DOI: 10.3390/s130911586] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 08/19/2013] [Accepted: 08/27/2013] [Indexed: 12/26/2022]
Abstract
This paper concerns the development of an electrochemical biosensor for the determination of Aβ16–23′ and Aβ1–40 peptides. The His-tagged V and VC1 domains of Receptor for Advanced Glycation end Products (RAGE) immobilized on a gold electrode surface were used as analytically active molecules. The immobilization of His6–RAGE domains consists of: (i) formation of a mixed layer of N-acetylcysteamine (NAC) and the thiol derivative of pentetic acid (DPTA); (ii) complexation of Cu(II) by DPTA; (iii) oriented immobilization of His6–RAGE domains via coordination bonds between Cu(II) sites from DPTA–Cu(II) complex and imidazole nitrogen atoms of a histidine tag. Each modification step was controlled by cyclic voltammetry (CV), Osteryoung square-wave voltammetry (OSWV), and atomic force microscopy (AFM). The applicability of the proposed biosensor was tested in the presence of human plasma, which had no influence on its performance. The detection limits for Aβ1–40 determination were 1.06 nM and 0.80 nM, in the presence of buffer and human plasma, respectively. These values reach the concentration level of Aβ1–40 which is relevant for determination of its soluble form in human plasma, as well as in brain. This indicates the promising future application of biosensor presented for early diagnosis of neurodegenerative diseases.
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Affiliation(s)
- Edyta Mikuła
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland; E-Mails: (E.M.); (J.R.)
| | - Magdalena Sulima
- Institute of Biochemistry and Biophysics of Polish Academy of Sciences, Pawińskiego 5a, Warsaw 02-106, Poland; E-Mails: (M.S.); (I.M.); (A.W.-C.)
| | - Ilona Marszałek
- Institute of Biochemistry and Biophysics of Polish Academy of Sciences, Pawińskiego 5a, Warsaw 02-106, Poland; E-Mails: (M.S.); (I.M.); (A.W.-C.)
| | - Aleksandra Wysłouch-Cieszyńska
- Institute of Biochemistry and Biophysics of Polish Academy of Sciences, Pawińskiego 5a, Warsaw 02-106, Poland; E-Mails: (M.S.); (I.M.); (A.W.-C.)
| | - Peter Verwilst
- Chemistry Department, University of Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium; E-Mails: (P.V.); (W.D.)
| | - Wim Dehaen
- Chemistry Department, University of Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium; E-Mails: (P.V.); (W.D.)
| | - Jerzy Radecki
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland; E-Mails: (E.M.); (J.R.)
| | - Hanna Radecka
- Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, Olsztyn 10-748, Poland; E-Mails: (E.M.); (J.R.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +48-89-523-4636; Fax: +48-89-524-0124
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Stachowiak JC, Schmid EM, Ryan CJ, Ann HS, Sasaki DY, Sherman MB, Geissler PL, Fletcher DA, Hayden CC. Membrane bending by protein-protein crowding. Nat Cell Biol 2012; 14:944-9. [PMID: 22902598 DOI: 10.1038/ncb2561] [Citation(s) in RCA: 388] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 07/12/2012] [Indexed: 02/07/2023]
Abstract
Curved membranes are an essential feature of dynamic cellular structures, including endocytic pits, filopodia protrusions and most organelles. It has been proposed that specialized proteins induce curvature by binding to membranes through two primary mechanisms: membrane scaffolding by curved proteins or complexes; and insertion of wedge-like amphipathic helices into the membrane. Recent computational studies have raised questions about the efficiency of the helix-insertion mechanism, predicting that proteins must cover nearly 100% of the membrane surface to generate high curvature, an improbable physiological situation. Thus, at present, we lack a sufficient physical explanation of how protein attachment bends membranes efficiently. On the basis of studies of epsin1 and AP180, proteins involved in clathrin-mediated endocytosis, we propose a third general mechanism for bending fluid cellular membranes: protein-protein crowding. By correlating membrane tubulation with measurements of protein densities on membrane surfaces, we demonstrate that lateral pressure generated by collisions between bound proteins drives bending. Whether proteins attach by inserting a helix or by binding lipid heads with an engineered tag, protein coverage above ~20% is sufficient to bend membranes. Consistent with this crowding mechanism, we find that even proteins unrelated to membrane curvature, such as green fluorescent protein (GFP), can bend membranes when sufficiently concentrated. These findings demonstrate a highly efficient mechanism by which the crowded protein environment on the surface of cellular membranes can contribute to membrane shape change.
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Affiliation(s)
- Jeanne C Stachowiak
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas 78712, USA.
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7
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Wang X, Mart RJ, Webb SJ. Vesicle aggregation by multivalent ligands: relating crosslinking ability to surface affinity. Org Biomol Chem 2007; 5:2498-505. [PMID: 17637972 DOI: 10.1039/b706662g] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In an effort to improve the stability of our tissue-mimetic vesicle aggregates, we have investigated how increasing the valency of our multivalent crosslinking ligand, poly-l-histidine, affected both the extent of vesicle aggregation and the affinity of the multivalent ligand for the synthetic receptor Cu(1) embedded in the vesicle membranes. Although increasing ligand valency gave the anticipated increase in the size of the vesicle aggregates, isothermal calorimetric studies did not show the expected increase in the valence-corrected binding constant for the embedded receptors. To explain both observations, we have developed a simple new binding model that encompasses both multivalent binding to receptors on a single vesicle surface (intramembrane binding) and vesicle crosslinking (intermembrane binding).
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Affiliation(s)
- Xi Wang
- Manchester Interdisciplinary Biocentre and the School of Chemistry, University of Manchester, 131 Princess Street, Manchester, UK
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Sun J, Vernier G, Wigelsworth DJ, Collier RJ. Insertion of anthrax protective antigen into liposomal membranes: effects of a receptor. J Biol Chem 2006; 282:1059-65. [PMID: 17107945 DOI: 10.1074/jbc.m609869200] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protective antigen (PA), the receptor-binding component of anthrax toxin, heptamerizes and inserts into the endosomal membrane at acidic pH, forming a pore that mediates translocation of the enzymic components of the toxin to the cytosol. When the heptameric pre-insertion form of PA (the prepore) is acidified in solution, it rapidly loses the ability to insert into membranes. To maximize insertion into model membranes, we examined two ways to bind the protein to large unilamellar vesicles (LUV). One involved attaching a His tag to the von Willebrand factor A domain of one of the PA receptors, ANTXR2, and using this protein as a bridge to bind PA to LUV containing a nickel-chelating lipid. The other involved using a His tag fused to the C terminus of PA to bind the protein directly to LUV containing the same lipid. Both ways enhanced pore formation at pH 5.0 strongly and about equally, as measured by the release of K+. Controls showed that pore formation in this system faithfully reproduced that in vivo. We also showed that binding unmodified ANTXR2 von Willebrand factor A to the prepore in solution enhanced its pore forming activity by slowing its inactivation at acidic pH. These findings indicate that an important role of PA receptors is to promote partitioning of PA into the bilayer by maintaining the prepore close to the target membrane and presumably in the optimal orientation as it undergoes the acidic pH-dependent conformational transition to the pore.
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Affiliation(s)
- Jianjun Sun
- Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA
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9
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Turner NW, Jeans CW, Brain KR, Allender CJ, Hlady V, Britt DW. From 3D to 2D: a review of the molecular imprinting of proteins. Biotechnol Prog 2006; 22:1474-89. [PMID: 17137293 PMCID: PMC2666979 DOI: 10.1021/bp060122g] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular imprinting is a generic technology that allows for the introduction of sites of specific molecular affinity into otherwise homogeneous polymeric matrices. Commonly this technique has been shown to be effective when targeting small molecules of molecular weight <1500, while extending the technique to larger molecules such as proteins has proven difficult. A number of key inherent problems in protein imprinting have been identified, including permanent entrapment, poor mass transfer, denaturation, and heterogeneity in binding pocket affinity, which have been addressed using a variety of approaches. This review focuses on protein imprinting in its various forms, ranging from conventional bulk techniques to novel thin film and monolayer surface imprinting approaches.
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Affiliation(s)
- Nicholas W. Turner
- Cranfield Health, Cranfield University at Silsoe, Silsoe MK45 4DT, UK
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112
| | - Christopher W. Jeans
- Welsh School of Pharmacy, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF1 3XF, UK
| | - Keith R. Brain
- Welsh School of Pharmacy, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF1 3XF, UK
| | - Christopher J. Allender
- Welsh School of Pharmacy, Cardiff University, Redwood Building, King Edward VII Avenue, Cardiff CF1 3XF, UK
| | - Vladimir Hlady
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112
| | - David W. Britt
- Department of Bioengineering, University of Utah, Salt Lake City, Utah 84112
- Department of Biological Engineering, Utah State University, 4105 Old Main Hill, Logan, Utah 84322
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10
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Affiliation(s)
- Michael Kruppa
- Institut für Organische Chemie, Universität Regensburg, D-93040 Regensburg, Germany
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11
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Turner NW, Jeans CW, Brain KR, Allender CJ, Hlady V, Britt DW. From 3D to 2D: A Review of the Molecular Imprinting of Proteins. Biotechnol Prog 2006. [DOI: 10.1002/bp060122g] [Citation(s) in RCA: 302] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Banerjee AL, Tobwala S, Haldar MK, Swanson M, Roy BC, Mallik S, Srivastava DK. Inhibition of matrix metalloproteinase-9 by “multi-prong” surface binding groups. Chem Commun (Camb) 2005:2549-51. [PMID: 15900322 DOI: 10.1039/b501780g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A novel strategy of blocking the active site accessibility of MMP-9 by "multi-prong" surface binding groups is described.
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Affiliation(s)
- Abir L Banerjee
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, ND 58105, USA
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13
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Webb SJ, Trembleau L, Mart RJ, Wang X. Membrane composition determines the fate of aggregated vesicles. Org Biomol Chem 2005; 3:3615-7. [PMID: 16211097 DOI: 10.1039/b510647h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Vesicles incorporating a fluorescent metal-chelating lipid can be linked together by addition of copper(II) and poly-L-histidine, but the stability of adhering vesicles towards fusion depends upon membrane composition.
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Affiliation(s)
- Simon J Webb
- Manchester Interdisciplinary Biocentre, School of Chemistry, University of Manchester, Oxford Rd, Manchester, M13 9PL, UK.
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Ciani I, Burt DP, Daniele S, Unwin PR. Effect of Surface Pressure on Oxygen Transfer across Molecular Monolayers at the Air/Water Interface: Scanning Electrochemical Microscopy Investigations Using a Mercury Hemispherical Microelectrode Probe. J Phys Chem B 2004. [DOI: 10.1021/jp036286m] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Ilenia Ciani
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K., and Department of Physical Chemistry, University of Venice, Calle Larga S. Marta, 2137, 30123 Venice, Italy
| | - David P. Burt
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K., and Department of Physical Chemistry, University of Venice, Calle Larga S. Marta, 2137, 30123 Venice, Italy
| | - Salvatore Daniele
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K., and Department of Physical Chemistry, University of Venice, Calle Larga S. Marta, 2137, 30123 Venice, Italy
| | - Patrick R. Unwin
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K., and Department of Physical Chemistry, University of Venice, Calle Larga S. Marta, 2137, 30123 Venice, Italy
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15
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Chikh GG, Li WM, Schutze-Redelmeier MP, Meunier JC, Bally MB. Attaching histidine-tagged peptides and proteins to lipid-based carriers through use of metal-ion-chelating lipids. BIOCHIMICA ET BIOPHYSICA ACTA 2002; 1567:204-12. [PMID: 12488054 DOI: 10.1016/s0005-2736(02)00618-1] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The therapeutic potential of selected peptides and proteins is enormous, with applications ranging from use as therapeutic vaccines, as modulators of intracellular signaling pathways and as highly selective agents capable of recognizing unique extracellular targets. We have been pursuing development of hybrid lipid-based carrier formulations designed to take advantage of the therapeutic benefits of peptides selected for their ability to act in a complementary fashion with the carrier system. In this regard, it is critical to have simple and versatile methods to promote and control the binding of diverse peptides to a broad range of carrier formulations. As demonstrated here, recombinant proteins and synthetic peptides containing poly-histidine residues (4 to 10) can be specifically bound to liposomes containing a metal-ion-chelating lipid, DOGS-NTA-Ni. The potential of this approach is demonstrated using two functional peptides, AntpHD-Cw3 (applications for vaccine production) and AHNP (specificity for Her-2 expressing cells).
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Affiliation(s)
- Ghania G Chikh
- Department of Advanced Therapeutics, British Columbia Cancer Research Center, 600 West 10th Avenue, Vancouver, BC, Canada V5Z 1L3
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16
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Boireau W, Bombard S, Sari MA, Pompon D. Bioengineering and characterization of DNA-protein assemblies floating on supported membranes. Biotechnol Bioeng 2002; 77:225-31. [PMID: 11753930 DOI: 10.1002/bit.10111] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A biodevice involving thiolated ssDNA and engineered cytochrome b5 linked through a cis-platine bridge is described. This original nanostructure is associated to a supported membrane through a floating anchor, thus constituting a dynamic bidimensionnal DNA capture device contrasting with the constrained geometry of currently available DNA chips. Characterization by optical spectroscopy, surface plasmon resonance and gel electrophoresis demonstrated that an unique molecular supra-assembly featuring specific DNA recognition capability has been obtained. This device is characterized by the reversibility of its assembly, self-organization and fluidity properties and is of interest as a prototype to design new generations of DNA chip biosensors.
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Affiliation(s)
- Wilfrid Boireau
- Laboratoire d'lngénierie des Protéines Membranaires, Centre de Génétique Moléculaire, CNRS, F-91198 Gif-sur-Yvette Cedex, France
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17
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Roy BC, Mallik S. Synthesis of conjugated diacetylene, metal-chelating monomers for polymerizable monolayer assemblies. Org Lett 2001; 3:1877-9. [PMID: 11405734 DOI: 10.1021/ol015931+] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[see structure]. Self-assembled monolayers (SAMs) of thiols on gold have been used for numerous applications. For protein targeting applications, one successful strategy is to use a metal-chelating SAM. It has also been demonstrated that polymerized SAMs are much more stable than non-polymerized counterparts. We report herein, the synthesis of several polymerizable, metal-chelating thiols capable of complexing luminescent lanthanide ions.
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Affiliation(s)
- B C Roy
- Department of Chemistry, North Dakota State University, Fargo, North Dakota 58105, USA
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Rogalska E, Bilewicz R, Brigaud T, El Moujahid C, Foulard G, Portella C, Stébé MJ. Formation and properties of Langmuir and Gibbs monolayers: a comparative study using hydrogenated and partially fluorinated amphiphilic derivatives of mannitol. Chem Phys Lipids 2000; 105:71-91. [PMID: 10727114 DOI: 10.1016/s0009-3084(99)00130-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The synthesis and surface behavior of a series of nine new hydrogenated nonionic surfactants and their fluorinated analogs, derived from D-mannitol are described. Adsorption monolayers (Gibbs monolayers) were studied by surface pressure (H) measurements as a function of time. For the spread monolayers (Langmuir monolayers), the measurements of surface pressure versus molecular area (A) were performed. For the most hydrophobic amphiphiles at low concentrations, the adsorption at the air/water interface from the bulk solution required extremely long times to attain equilibrium. The A values for two compounds which could be studied in both adsorbed and spread monolayers provided data allowing a direct comparison of the properties of the two types of films formed at the air/water interface. In spite of different mechanisms of formation of Langmuir and Gibbs monolayers, their characteristic parameters were identical, proving the equivalence of these two types of structures.
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Affiliation(s)
- E Rogalska
- Equipe de Physico-Chimie des Colloides, UMR 7565 CNRS/Université Henri Poincaré Nancy I, Faculté des Sciences, Vandoeuvre-lès-Nancy, France.
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19
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Leckband DE, Kuhl TL, Wang HK, Müller W, Herron J, Ringsdorf H. Force probe measurements of antibody-antigen interactions. Methods 2000; 20:329-40. [PMID: 10694455 DOI: 10.1006/meth.1999.0926] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The surface force apparatus has been used to quantify directly the forces that govern the interactions between proteins and ligands. In this work, we describe the measured interactions between the antigen fluorescein and the Fab' fragment of the monoclonal 4-4-20 anti-fluorescyl IgG antibody. Here we first describe the use of the surface force apparatus to demonstrate directly the impact of the charge composition in the region of the antibody binding site on the antibody interactions. Several approaches are described for immobilizing antigens, antibodies, and proteins in general for direct force measurements. The measured force profiles presented are accompanied by an extensive discussion of protocols used to analyze the force-distance curves and to interpret them in terms of the antibody structure. In addition to long-range electrostatic forces, we also consider short-range forces that can affect the strength of adhesion between the Fab' and immobilized fluorescein. The latter investigations demonstrate the influence of interfacial properties on the recognition of surface-bound antigens.
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Affiliation(s)
- D E Leckband
- Department of Chemical Engineering and Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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20
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Maloney KM, Schief WR, Pack DW, Frey W, Arnold FH, Vogel V. Binding and two-dimensional crystallization of streptavidin at the air/water interface via engineered Cu-IDA chelator lipids. Coord Chem Rev 1999. [DOI: 10.1016/s0010-8545(98)00174-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Abstract
A variety of methodologies are under development to alter the behavior of existing metal centers or create entirely new sites within a protein framework in order to exploit the intrinsic chemical versatility of metals using the exquisite level of control that a protein matrix can exert to modulate their reactivity. Even at this relatively early stage, engineering of metal centers has led to the development of a number of emerging technologies with a wide variety of applications, including affinity purification of proteins, engineering of metal-mediated protein stability, control of protein activity, imaging and therapy, biosensors, and new catalysts.
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