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Răileanu M, Lonetti B, Serpentini CL, Goudounèche D, Gibot L, Bacalum M. Encapsulation of a cationic antimicrobial peptide into self-assembled polyion complex nano-objects enhances its antitumor properties. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Parigi G, Ravera E, Fragai M, Luchinat C. Unveiling protein dynamics in solution with field-cycling NMR relaxometry. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2021; 124-125:85-98. [PMID: 34479712 DOI: 10.1016/j.pnmrs.2021.05.001] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/04/2021] [Accepted: 05/04/2021] [Indexed: 06/13/2023]
Abstract
Field-cycling NMR relaxometry is a well-established technique that can give information on molecular structure and dynamics of biological systems. It provides the nuclear relaxation rates as a function of the applied magnetic field, starting from fields as low as ~ 10-4 T up to about 1-3 T. The profiles so collected, called nuclear magnetic relaxation dispersion (NMRD) profiles, can be extended to include the relaxation rates at the largest fields achievable with high resolution NMR spectrometers. By exploiting this wide range of frequencies, the NMRD profiles can provide information on motions occurring on time scales from 10-6 to 10-9 s. 1H NMRD measurements have proved very useful also for the characterization of paramagnetic proteins, because they can help characterise a number of parameters including the number, distance and residence time of water molecules coordinated to the paramagnetic center, the reorientation correlation times and the electron spin relaxation time, and the electronic structure at the metal site.
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Affiliation(s)
- Giacomo Parigi
- Magnetic Resonance Center (CERM) University of Florence, via Sacconi 6, Sesto Fiorentino, Italy; Department of Chemistry, "Ugo Schiff", University of Florence, via della Lastruccia 3, Sesto Fiorentino, Italy; Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy.
| | - Enrico Ravera
- Magnetic Resonance Center (CERM) University of Florence, via Sacconi 6, Sesto Fiorentino, Italy; Department of Chemistry, "Ugo Schiff", University of Florence, via della Lastruccia 3, Sesto Fiorentino, Italy; Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy
| | - Marco Fragai
- Magnetic Resonance Center (CERM) University of Florence, via Sacconi 6, Sesto Fiorentino, Italy; Department of Chemistry, "Ugo Schiff", University of Florence, via della Lastruccia 3, Sesto Fiorentino, Italy; Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM) University of Florence, via Sacconi 6, Sesto Fiorentino, Italy; Department of Chemistry, "Ugo Schiff", University of Florence, via della Lastruccia 3, Sesto Fiorentino, Italy; Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy
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Read E, Lonetti B, Gineste S, Sutton AT, Di Cola E, Castignolles P, Gaborieau M, Mingotaud AF, Destarac M, Marty JD. Mechanistic insights into the formation of polyion complex aggregates from cationic thermoresponsive diblock copolymers. J Colloid Interface Sci 2021; 590:268-276. [PMID: 33548610 DOI: 10.1016/j.jcis.2021.01.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 12/11/2020] [Accepted: 01/10/2021] [Indexed: 11/30/2022]
Abstract
HYPOTHESIS The formation of polyion complexes (PICs) comprising thermoresponsive polymers is intended to result in the formation of aggregates that undergo significant structural changes with temperature. Moreover the observed modifications might be critically affected by polymer structure and PICs composition. EXPERIMENTS Different block copolymers based on cationic poly(3-acrylamidopropyltrimethylammonium chloride) and thermoresponsive poly(N-isopropylacrylamide) were synthesized by aqueous RAFT/MADIX polymerization at room temperature. Addition of poly(acrylic acid) in a controlled fashion led to the formation of PICs aggregates. The structural changes induced by temperature were characterized by differential scanning calorimetry, Nuclear Magnetic Resonance spectroscopy and scattering methods. FINDINGS Thermoresponsive PICs undergo significant structural changes when increasing temperature above the cloud point of the thermoresponsive block. The reversibility of these phenomena depends strongly on the structural parameters of the block copolymers and on PICs composition.
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Affiliation(s)
- E Read
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
| | - B Lonetti
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
| | - S Gineste
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
| | - A T Sutton
- Western Sydney University, ACROSS, School of Science, Locked Bag 1797, Penrith, NSW 2751, Australia; Future Industries Institute, University of South Australia, P.O. Box 2471, Adelaide, South Australia 5001, Australia
| | | | - P Castignolles
- Western Sydney University, ACROSS, School of Science, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - M Gaborieau
- Western Sydney University, ACROSS, School of Science, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - A-F Mingotaud
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
| | - M Destarac
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.
| | - J-D Marty
- Laboratoire des IMRCP, Université Paul Sabatier, CNRS, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France.
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Sproncken CM, Magana JR, Voets IK. 100th Anniversary of Macromolecular Science Viewpoint: Attractive Soft Matter: Association Kinetics, Dynamics, and Pathway Complexity in Electrostatically Coassembled Micelles. ACS Macro Lett 2021; 10:167-179. [PMID: 33628618 PMCID: PMC7894791 DOI: 10.1021/acsmacrolett.0c00787] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 01/05/2021] [Indexed: 02/07/2023]
Abstract
Electrostatically coassembled micelles constitute a versatile class of functional soft materials with broad application potential as, for example, encapsulation agents for nanomedicine and nanoreactors for gels and inorganic particles. The nanostructures that form upon the mixing of selected oppositely charged (block co)polymers and other ionic species greatly depend on the chemical structure and physicochemical properties of the micellar building blocks, such as charge density, block length (ratio), and hydrophobicity. Nearly three decades of research since the introduction of this new class of polymer micelles shed significant light on the structure and properties of the steady-state association colloids. Dynamics and out-of-equilibrium processes, such as (dis)assembly pathways, exchange kinetics of the micellar constituents, and reaction-assembly networks, have steadily gained more attention. We foresee that the broadened scope will contribute toward the design and preparation of otherwise unattainable structures with emergent functionalities and properties. This Viewpoint focuses on current efforts to study such dynamic and out-of-equilibrium processes with greater spatiotemporal detail. We highlight different approaches and discuss how they reveal and rationalize similarities and differences in the behavior of mixed micelles prepared under various conditions and from different polymeric building blocks.
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Affiliation(s)
- Christian
C. M. Sproncken
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
| | - J. Rodrigo Magana
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Ilja K. Voets
- Laboratory of Self-Organizing
Soft Matter, Department of Chemical Engineering and Chemistry and
Institute for Complex Molecular Systems, Eindhoven University of Technology, PO Box 513, 5600 MB, Eindhoven, The Netherlands
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Amann M, Diget JS, Lyngsø J, Pedersen JS, Narayanan T, Lund R. Kinetic Pathways for Polyelectrolyte Coacervate Micelle Formation Revealed by Time-Resolved Synchrotron SAXS. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01072] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Matthias Amann
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jakob Stensgaard Diget
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jeppe Lyngsø
- Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
| | - Jan Skov Pedersen
- Department of Chemistry and iNANO, Aarhus University, Langelandsgade 140, 8000 Aarhus, Denmark
| | - Theyencheri Narayanan
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38043 Grenoble, France
| | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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Fragai M, Ravera E, Tedoldi F, Luchinat C, Parigi G. Relaxivity of Gd-Based MRI Contrast Agents in Crosslinked Hyaluronic Acid as a Model for Tissues. Chemphyschem 2019; 20:2204-2209. [PMID: 31298452 DOI: 10.1002/cphc.201900587] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 07/11/2019] [Indexed: 12/12/2022]
Abstract
The efficiency of MRI contrast agents depends on the relaxation rate enhancement that they can induce at imaging fields. It is well known that, at these fields, large relaxation rates are obtained by binding of gadolinium(III) ions to large molecules. By the same token, the interaction of the gadolinium(III) complexes with macromolecules that are found in biological tissues can be responsible for an increase of the relaxation rate with respect to the value observed in liquids. We investigate here the relaxation enhancement of gadoteridol (Gd-HP-DO3A) in crosslinked hyaluronic acid, taken as model tissue, using fast field-cycling relaxometry. The analysis of the relaxation profiles as a function of the magnetic fields indicates that a sizable increase in the relaxation rates is due to a modest interaction of the contrast agent with the hydrogel and to the slower mobility of the water molecules outside the first-coordination sphere of the gadolinium(III) ion.
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Affiliation(s)
- Marco Fragai
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Enrico Ravera
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Fabio Tedoldi
- Bracco Imaging Spa, Bracco Research Centre, Via Ribes 5, 10010, Colleretto Giacosa (TO), Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Giacomo Parigi
- Magnetic Resonance Center (CERM), University of Florence, and Consorzio Interuniversitario Risonanze Magnetiche di Metalloproteine (CIRMMP), via Sacconi 6, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
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Baer A, Hänsch S, Mayer G, Harrington MJ, Schmidt S. Reversible Supramolecular Assembly of Velvet Worm Adhesive Fibers via Electrostatic Interactions of Charged Phosphoproteins. Biomacromolecules 2018; 19:4034-4043. [DOI: 10.1021/acs.biomac.8b01017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Alexander Baer
- Department of Zoology, Institute of Biology, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Sebastian Hänsch
- Center for Advanced Imaging (CAi), Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Georg Mayer
- Department of Zoology, Institute of Biology, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Matthew J. Harrington
- Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Stephan Schmidt
- Institute of Organic and Macromolecular Chemistry, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße Universitätsstr. 1, 40225 Düsseldorf, Germany
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