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Simončič M, Hritz J, Lukšič M. Biomolecular Complexation on the "Wrong Side": A Case Study of the Influence of Salts and Sugars on the Interactions between Bovine Serum Albumin and Sodium Polystyrene Sulfonate. Biomacromolecules 2022; 23:4412-4426. [PMID: 36134887 PMCID: PMC9554918 DOI: 10.1021/acs.biomac.2c00933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the protein purification, drug delivery, food industry, and biotechnological applications involving protein-polyelectrolyte complexation, proper selection of co-solutes and solution conditions plays a crucial role. The onset of (bio)macromolecular complexation occurs even on the so-called "wrong side" of the protein isoionic point where both the protein and the polyelectrolyte are net like-charged. To gain mechanistic insights into the modulatory role of salts (NaCl, NaBr, and NaI) and sugars (sucrose and sucralose) in protein-polyelectrolyte complexation under such conditions, interaction between bovine serum albumin (BSA) and sodium polystyrene sulfonate (NaPSS) at pH = 8.0 was studied by a combination of isothermal titration calorimetry, fluorescence spectroscopy, circular dichroism, and thermodynamic modeling. The BSA-NaPSS complexation proceeds by two binding processes (first, formation of intrapolymer complexes and then formation of interpolymer complexes), both driven by favorable electrostatic interactions between the negatively charged sulfonic groups (-SO3-) of NaPSS and positively charged patches on the BSA surface. Two such positive patches were identified, each responsible for one of the two binding processes. The presence of salts screened both short-range attractive and long-range repulsive electrostatic interactions between both macromolecules, resulting in a nonmonotonic dependence of the binding affinity on the total ionic strength for both binding processes. In addition, distinct anion-specific effects were observed (NaCl < NaBr < NaI). The effect of sugars was less pronounced: sucrose had no effect on the complexation, but its chlorinated analogue, sucralose, promoted it slightly due to the screening of long-range repulsive electrostatic interactions between BSA and NaPSS. Although short-range non-electrostatic interactions are frequently mentioned in the literature in relation to BSA or NaPSS, we found that the main driving force of complexation on the "wrong side" are electrostatic interactions.
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Affiliation(s)
- Matjaž Simončič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, SI-1000 Ljubljana, Slovenia
| | - Jozef Hritz
- Central European Institute of Technology, Masaryk University, Kamenice 5, CZ-62500 Brno, Czechia.,Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, CZ-62500 Brno, Czechia
| | - Miha Lukšič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna Pot 113, SI-1000 Ljubljana, Slovenia
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Bercea M. Self-Healing Behavior of Polymer/Protein Hybrid Hydrogels. Polymers (Basel) 2021; 14:130. [PMID: 35012155 PMCID: PMC8747654 DOI: 10.3390/polym14010130] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/20/2021] [Accepted: 12/27/2021] [Indexed: 12/17/2022] Open
Abstract
The paper presents the viscoelastic properties of new hybrid hydrogels containing poly(vinyl alcohol) (PVA), hydroxypropylcellulose (HPC), bovine serum albumin (BSA) and reduced glutathione (GSH). After heating the mixture at 55 °C, in the presence of GSH, a weak network is formed due to partial BSA unfolding. By applying three successive freezing/thawing cycles, a stable porous network structure with elastic properties is designed, as evidenced by SEM and rheology. The hydrogels exhibit self-healing properties when the samples are cut into two pieces; the intermolecular interactions are reestablished in time and therefore the fragments repair themselves. The effects of the BSA content, loaded deformation and temperature on the self-healing ability of hydrogels are presented and discussed through rheological data. Due to their versatile viscoelastic behavior, the properties of PVA/HPC/BSA hydrogels can be tuned during their preparation in order to achieve suitable biomaterials for targeted applications.
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Affiliation(s)
- Maria Bercea
- "Petru Poni" Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
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3
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Associative interactions between pullulan and negatively charged bovine serum albumin in physiological saline solutions. Carbohydr Polym 2020; 246:116630. [DOI: 10.1016/j.carbpol.2020.116630] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/08/2020] [Accepted: 06/10/2020] [Indexed: 01/18/2023]
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Talukdar H, Kundu S. Thin films of protein (BSA, lysozyme) - Polyelectrolyte (PSS) complexes show larger red-shift in optical emissions irrespective of protein conformation. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.074] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Golshaei R, Guler Z, Sarac SA. (Au/PANA/PVAc) nanofibers as a novel composite matrix for albumin and streptavidin immobilization. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 60:260-275. [DOI: 10.1016/j.msec.2015.11.046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 10/27/2015] [Accepted: 11/16/2015] [Indexed: 12/30/2022]
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6
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Dubois JLN, Lavignac N. Cationic poly(amidoamine) promotes cytosolic delivery of bovine RNase A in melanoma cells, while maintaining its cellular toxicity. J Mater Chem B 2015; 3:6501-6508. [PMID: 32262558 DOI: 10.1039/c4tb02065k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ribonucleases are known to cleave ribonucleic acids, inducing cell death. RNase A, a member of the ribonuclease family, generally displayed poor in vitro activity. This has been attributed to factors such as low intracellular delivery. Poly(amidoamine)s have been used to promote the translocation of non-permeant proteins to the cytosol. Our objective was to demonstrate that poly(amidoamine)s could potentially promote the delivery of RNase A to selected cell line. Interactions of three cationic poly(amidoamine)s (P1, P2 and ISA1) with wild-type bovine RNase A were investigated using gel retardation assays, DLS and microcalorimetry. Although the polymers and the protein are essentially cationic at physiological pH, complexation between the PAAs and RNase A was observed. The high sensitivity differential scanning calorimetry (HSDSC) thermograms demonstrated that the thermal stability of the protein was reduced when complexed with ISA1 (Tmax decreased by 6.5 °C) but was not affected by P1 and P2. All the polymers displayed low cytotoxicity towards non-cancerous cells (IC50 > 3.5 mg mL-1). While RNase A alone was not toxic to mouse melanoma cells (B16F1), P1 was able to promote cytosolic delivery of biologically active RNase A, increasing cell death (IC50 = 0.09 mg mL-1).
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Affiliation(s)
- Julie L N Dubois
- Medway School of Pharmacy, Universities of Kent and Greenwich at Medway, Central Avenue, Chatham ME4 4TB, UK.
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Zhang S, Moustafa Y, Huo Q. Different interaction modes of biomolecules with citrate-capped gold nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21184-21192. [PMID: 25347206 DOI: 10.1021/am506112u] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this study, we investigated the interaction between five biorelevant molecules and citrate-capped gold nanoparticles using dynamic light scattering, ζ-potential analysis, UV-vis absorption spectroscopy, and transmission electron microscopy. The five biomolecules are bovine serum albumin (BSA), two immunoglobulin G (IgG) proteins, immunoglobulin M (IgM), and a polysaccharide molecule, hyaluronan. BSA, IgG, and IgM are high abundance proteins in blood. Hyaluronan is a major component of the extracellular matrix. An abnormal level of hyaluronan in blood is associated with a number of medical conditions including rheumatoid arthritis and malignancy. Five different interaction modes were observed from these molecules. While BSA and IgM interact with the gold nanoparticles by forming electrostatic interactions with the citrate ligands, IgG and hyaluronan adsorb to the nanoparticle metal core by displacing the citrate ligands. BSA, rabbit IgG, and hyaluronan formed a stable monolayer on the nanoparticle surface. Human IgG and IgM caused nanoparticle cluster formation upon interacting with the gold nanoparticles. For the first time, we discovered that hyaluronan, a highly negatively charged polyglycosaminoglycan, exhibits an exceptionally strong affinity toward the citrate-gold nanoparticles. It can effectively compete with IgG to adsorb to the gold nanoparticles. This finding has exciting implications for future research: the molecular composition of a protein corona formed on a nanoparticle surface upon mixing the nanoparticle with blood or other biological fluids may vary according to the pathological conditions of individuals, and the analysis of these compositions could potentially lead to new biomarker discovery with diagnostic applications.
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Affiliation(s)
- Shiyun Zhang
- NanoScience Technology Center, Department of Chemistry, College of Science, and Burnett School of Biomedical Science, College of Medicine, University of Central Florida , 12424 Research Parkway, Suite 400, Orlando, Florida 32826, United States
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8
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Hemmelmann M, Mohr K, Fischer K, Zentel R, Schmidt M. Interaction of pHPMA–pLMA Copolymers with Human Blood Serum and Its Components. Mol Pharm 2013; 10:3769-75. [DOI: 10.1021/mp400254b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Mirjam Hemmelmann
- Institute of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
| | - Kristin Mohr
- Institute for Physical Chemistry, University of Mainz, Welder Weg
11, D-55099 Mainz, Germany
| | - Karl Fischer
- Institute for Physical Chemistry, University of Mainz, Welder Weg
11, D-55099 Mainz, Germany
| | - Rudolf Zentel
- Institute of Organic Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
| | - Manfred Schmidt
- Institute for Physical Chemistry, University of Mainz, Welder Weg
11, D-55099 Mainz, Germany
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9
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Polyelectrolyte–protein interaction at low ionic strength: required chain flexibility depending on protein average charge. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-2911-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Yan Y, Liu J, Xiong Y, Cheng Y, Yao P. Superoxide Dismutase Binding and Release Behaviors of Dodecylated Poly(allylamine)s: Effects of Self-Aggregation and Organic Solvents. MACROMOL CHEM PHYS 2012. [DOI: 10.1002/macp.201200130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Interactions between solubilized polymer molecules and blood components. J Control Release 2012; 160:14-24. [DOI: 10.1016/j.jconrel.2012.02.005] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 02/01/2012] [Indexed: 12/19/2022]
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12
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Binding of thermo-sensitive and pH-sensitive butylated poly(allylamine)s with lysozyme. CHINESE JOURNAL OF POLYMER SCIENCE 2011. [DOI: 10.1007/s10118-011-1054-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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13
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Investigation of the complexation of proteins with neutral water soluble polymers through model analysis method. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.01.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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14
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Mándity IM, Fülöp L, Vass E, Tóth GK, Martinek TA, Fülöp F. Building β-peptide H10/12 foldamer helices with six-membered cyclic side-chains: fine-tuning of folding and self-assembly. Org Lett 2010; 12:5584-7. [PMID: 21050013 DOI: 10.1021/ol102494m] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The ability of the β-peptidic H10/12 helix to tolerate side-chains containing six-membered alicyclic rings was studied. cis-2-Aminocyclohex-3-ene carboxylic acid (cis-ACHEC) residues afforded H10/12 helix formation with alternating backbone configuration. Conformational polymorphism was observed for the alternating cis-ACHC hexamer, where chemical exchange takes place between the major left-handed H10/12 helix and a minor folded conformation. The hydrophobically driven self-assembly was achieved for the cis-ACHC-containing helix which was observed as vesicles ~100 nm in diameter.
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Affiliation(s)
- István M Mándity
- Institute of Pharmaceutical Chemistry, University of Szeged, H-6720 Szeged, Eötvös u. 6, Hungary
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Li J, Feng J, Dang Q, Qiao Y, Zhao J, Zhang S, Sun H, Wen X, Yuan Z. Affinity adsorption mechanism studies of adsorbents for oligopeptides using model polymer. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.01.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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The use of amphipols as universal molecular adapters to immobilize membrane proteins onto solid supports. Proc Natl Acad Sci U S A 2008; 106:405-10. [PMID: 19116278 DOI: 10.1073/pnas.0807132106] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Because of the importance of their physiological functions, cell membranes represent critical targets in biological research. Membrane proteins, which make up approximately 1/3 of the proteome, interact with a wide range of small ligands and macromolecular partners as well as with foreign molecules such as synthetic drugs, antibodies, toxins, or surface recognition proteins of pathogenic organisms. Whether it is for the sake of basic biomedical or pharmacological research, it is of great interest to develop tools facilitating the study of these interactions. Surface-based in vitro assays are appealing because they require minimum quantities of reagents, and they are suitable for multiplexing and high-throughput screening. We introduce here a general method for immobilizing functional, unmodified integral membrane proteins onto solid supports, thanks to amphipathic polymers called "amphipols." The key point of this approach is that functionalized amphipols can be used as universal adapters to associate any membrane protein to virtually any kind of support while stabilizing its native state. The generality and versatility of this strategy is demonstrated by using 5 different target proteins, 2 types of supports (chips and beads), 2 types of ligands (antibodies and a snake toxin), and 2 detection methods (surface plasmon resonance and fluorescence microscopy).
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17
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Kee HL, Bhaumik J, Diers JR, Mroz P, Hamblin MR, Bocian DF, Lindsey JS, Holten D. Photophysical Characterization of Imidazolium-Substituted Pd(II), In(III), and Zn(II) Porphyrins as Photosensitizers for Photodynamic Therapy. J Photochem Photobiol A Chem 2008; 200:346-355. [PMID: 20016663 DOI: 10.1016/j.jphotochem.2008.08.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Hooi Ling Kee
- Department of Chemistry, Washington University, St. Louis, MO 63130-4889
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18
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Li J, Dang Q, Sun H, Cha R, Yuan Z. The effect of α-helix comformation on interaction between model oligopeptides and polymers. CHINESE SCIENCE BULLETIN-CHINESE 2008. [DOI: 10.1007/s11434-008-0065-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Pouliquen G, Amiel C, Tribet C. Photoresponsive Viscosity and Host−Guest Association in Aqueous Mixtures of Poly-Cyclodextrin with Azobenzene-Modified Poly(acrylic)acid. J Phys Chem B 2007; 111:5587-95. [PMID: 17469868 DOI: 10.1021/jp070798+] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In aqueous solutions, beta-cyclodextrin (CD) and cyclodextrin-containing polymers (PolCD) associate with azobenzene-modified polyacrylate (AMP). Inclusion complexes in solution of CD (or PolCD) and AMP, and the viscosity of these mixtures, have been studied as a function of the composition of AMP and concentrations of samples. AMPs are random copolymers containing a low fraction of a light-responsive hydrophobic moieties (<10 mol % of 6-[4-alkylamido]phenylazobenzene acrylamide), and a charged hydrophilic unit, sodium acrylate. PolCDs are beta-cyclodextrin randomly conjugated with epichlorohydrin and fractionated to yield copolymers of average number of CD per chain equal to 50. In dilute solutions, the composition of complexes has been investigated by capillary electrophoresis and UV-vis spectrometry. Association between PolCD and AMP appears more complex than the conventional Benesi-Hildebrand scheme. We identified a tight (quantitative) binding regime followed by a gradual increase of the density of AMP-bound PolCD upon increasing the concentration of PolCD. At higher concentrations, the formation of large clusters has been characterized by the increase of viscosity by several decades. Light-triggered trans-conformation of the azobenzene moieties of AMPs leads to a marked photoswitch of viscosity. Reversible viscosity swings by up to 6-fold were achieved by alternative exposure to UV and visible lights. In contrast, the composition of PolCD/AMP complexes in dilute regime does not respond to light, though subtle modifications of the structures of complexes are reflected by variation of electrophoretic mobilities and UV spectra. The properties of interpolymer clusters and photoviscosity are accordingly the result of modification of the dynamics of association. In practice, the low concentration of photochrome makes it possible to obtain rapid responses in samples having a thickness of the order of cm. The data reported provide guidelines for the formulations of CD/polymer systems, specifically, viscosity enhancers, which should show promising developments in pharmaceuticals or cosmetics.
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Affiliation(s)
- G Pouliquen
- Physico-chimie des Polymères et Milieux Dispersés, UMR 7615 CNRS and University Paris 6, ESPCI, 10 rue Vauquelin, F-75005 Paris, France
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Roy R, Sandanaraj BS, Klaikherd A, Thayumanavan S. Tuning substrate selectivity of a cationic enzyme using cationic polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7695-700. [PMID: 16922552 DOI: 10.1021/la060496j] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Noncovalent interactions between an artificial molecular scaffold and a protein are interesting due to the possibility of reversible modulation of the activity of the protein. alpha-Chymotrypsin is a positively charged protein that has been shown to interact with negatively charged polymers. Here we show that positively charged polymers are also capable of electrostatically binding to this protein. The resulting experiments show that the ability of a polymer to bind a protein does not depend only on the pI of the protein. We also realized that the variations in charge density in the polymer backbone afford different selectivities of the enzyme toward charged substrates.
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Affiliation(s)
- Raghunath Roy
- Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA
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Pouliquen G, Tribet C. Light-Triggered Association of Bovine Serum Albumin and Azobenzene-Modified Poly(acrylic acid) in Dilute and Semidilute Solutions. Macromolecules 2006. [DOI: 10.1021/ma0512152] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Schmitt C, da Silva TP, Bovay C, Rami-Shojaei S, Frossard P, Kolodziejczyk E, Leser ME. Effect of time on the interfacial and foaming properties of beta-lactoglobulin/acacia gum electrostatic complexes and coacervates at pH 4.2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:7786-95. [PMID: 16089384 DOI: 10.1021/la0510984] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The electrostatic complexation between beta-lactoglobulin and acacia gum was investigated at pH 4.2 and 25 degrees C. The binding isotherm revealed a spontaneous exothermic reaction, leading to a DeltaHobs = -2108 kJ mol(-1) and a saturation protein to polysaccharide weight mixing ratio of 2:1. Soluble electrostatic complexes formed in these conditions were characterized by a hydrodynamic diameter of 119 +/- 0.6 nm and a polydispersity index of 0.097. The effect of time on the interfacial and foaming properties of these soluble complexes was investigated at a concentration of 0.1 wt % at two different times after mixing (4 min, referred as t approximately 0 h and t = 24 h). At t approximately 0 h, the mixture is mainly made of aggregating soluble electrostatic complexes, whereas after 24 h these complexes have already insolubilize to form liquid coacervates. The surface elasticity, viscosity and phase angle obtained at low frequency (0.01 Hz) using oscillating bubble tensiometry revealed higher fluidity and less rigidity in the film formed at t approximately 0 h. This observation was confirmed by diminishing bubble experiments coupled with microscopy of the thin film. It was thicker, more homogeneous and contained more water at t approximately 0 h as compared to t = 24 h (thinner film, less water). This led to very different gas permeability's of Kt approximately 0 h = 0.021 cm s(-1) and Kt=24 h) = 0.449 cm s(-1), respectively. Aqueous foams produced with the beta-lactoglobulin/acacia gum electrostatic complexes or coacervates exhibited very different stability. The former (t approximately 0 h) had a stable volume, combining low drainage rate and mainly air bubble disproportionation as the destabilization mechanism. By contrast, using coacervates aged for 24 h, the foam was significantly less stable, combining fast liquid drainage and air bubble destabilization though fast gas diffusion followed by film rupture and bubble coalescence. The strong effect of time on the air/water interfacial properties of the beta-lactoglobulin/acacia gum electrostatic complexes can be understood by their reorganization at the interface to form a coacervate phase that is more fluid/viscous at t approximately 0 h vs rigid/elastic at t = 24 h.
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Affiliation(s)
- Christophe Schmitt
- Department of Food Science, Nestlé Research Center, Vers-chez-les-Blanc, CH-1000 Lausanne 26, Switzerland.
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Jönsson M, Linse P. Structure and Thermodynamics of Protein−Polymer Solutions: Effects of Spatially Distributed Hydrophobic Surface Residues. J Phys Chem B 2005; 109:15107-17. [PMID: 16852912 DOI: 10.1021/jp0451288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protein-polymer association in solution driven by a short-range attraction has been investigated using a simple coarse-grain model solved by Monte Carlo simulations. The effect of the spatial distribution of the hydrophobic surface residues of the protein on the adsorption of weakly hydrophobic polymers at variable polymer concentration, polymer length, and polymer stiffness has been considered. Structural data on the adsorbed polymer layer and thermodynamic properties, such as the free energy, energy, and entropy, related to the protein-polymer interaction were calculated. It was found that a more heterogeneous distribution of the surface residues promotes adsorption and that this also applies for different polymer concentrations, polymer chain lengths, and polymer flexibilities. Furthermore, the polymer adsorption onto proteins with more homogeneous surface distributions displayed larger sensitivity to polymer properties such as chain length and flexibility. Finally, a simple relation between the adsorption probability and the change in the free energy was found and rationalized by a simple two-state adsorption model.
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Affiliation(s)
- Malin Jönsson
- Biochemistry and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden.
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Vial F, Rabhi S, Tribet C. Association of octyl-modified poly(acrylic acid) onto unilamellar vesicles of lipids and kinetics of vesicle disruption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:853-862. [PMID: 15667160 DOI: 10.1021/la048039v] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Water-soluble polymers containing a few hydrophobic anchors are known to bind onto lipid vesicles and are used as stabilizers of liposome-based formulas. In contrast, polymers with high hydrophobicity destabilize the lipid bilayers. With macromolecules of intermediate hydrophobic/hydrophilic balance, a gradual sweep of the stabilization-destabilization capacity can be achieved and is considered as promising triggered systems for drug release, although the mechanism of permeabilization and membrane breakage using polymers is essentially conjectural to date. As a model system, we used short octyl-modified poly(acrylic acid)s (MW 8000 g/mol) sensitive to pH, temperature, and ionic strength in conjunction with small unilamellar vesicles mainly comprised of DPPC or egg-PC. Kinetics of vesicle fragmentation was followed using static and dynamic light scattering. Polymer adsorption was studied by nonradiative energy transfer between pyrene-labeled lipids and a naphthalene-modified polymer. The permeability of the vesicles was characterized by calcein leakage experiments. The key findings were (i) the lack of coupling between the density of bound polymer and the rate of disruption and (ii) the qualitative difference depending on whether the polymer contains or not isopropyl side groups. Point i relates to the increase of the rate of polymer adsorption with increasing bulk polymer concentration, while the breakage is essentially unaffected. Point ii relates to the stabilization of large membrane fragments (Stokes radius ca. 40 nm) in the presence of a polymer with no isopropyl side groups, while micelle-like assemblies (Stokes radius 8 nm) containing the lipids are obtained with an isopropyl-containing polymer of similar hydrophobicity. Both polymers display similar efficiency at disrupting small vesicles. The mechanism of polymer-induced disruption appears to differ markedly from the disruption steps now recognized for conventional (molecular) surfactant and is discussed on the basis of data obtained with different membrane fluidity, polymer structure, concentration, and hydrophilicity.
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Affiliation(s)
- Florent Vial
- Laboratoire de Physico-chimie macromoléculaire, CNRS UMR 7615, Université Paris 6, ESPCI, 10 rue Vauquelin, 75005 Paris, France
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Mekhloufi G, Sanchez C, Renard D, Guillemin S, Hardy J. pH-Induced structural transitions during complexation and coacervation of beta-lactoglobulin and acacia gum. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:386-394. [PMID: 15620329 DOI: 10.1021/la0486786] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
pH-Induced structural changes during complex coacervation between beta-lactoglobulin (BLG) and Acacia gum (AG) in aqueous solutions were determined by coupling slow in situ acidification of BLG/AG mixed dispersions and different experimental methods. The combined signal evolution of dynamic light scattering at 90 degrees scattering angle (I(90)), electrophoretic mobility, turbidimetry (tau), circular dichroism, and phase contrast microscopy allowed the distinction of critical structural transitions and the definition of their corresponding pH. The formation of soluble BLG/AG complexes was initiated at pH(sc) (4.90), since I(90) and tau significantly increased from the baseline. In parallel or just following complexation, a conformational change of BLG was detected at pH(pct) (4.8). An increase in positive charge density of BLG induced complex aggregation at pH(ca) (4.7). More efficient charge neutralization of aggregated complexes, especially through the lowering of the number of AG negative charges, promoted initiation of phase separation at pH(psi) (4.4). Mixed dispersions became unstable and phase separation occurred at pH(ps) (4.2). The phase separation of mixed dispersions was suggested by the maximum value of scattered light, by an important acceleration of the dispersion turbidity, by a strong increase of hydrodynamic radii, and by the first appearance of light fluctuations as observed by phase contrast microscopy. At the microscopic level, the first coacervates were observed at pH(coa) (4.0), near the pH of the maximum of turbidity. It was also noticed that, from the onset of interactions between biopolymers, the pH decrease led to (i) a gradual homogenization of particle size in the mixed dispersion as suggested by the decrease of dispersion polydispersity and (ii) conformational transitions of the protein (a loss of alpha-helix structure at pH(pct) and a gain in protein secondary structure near pH(coa), probably involving beta-sheet components).
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Affiliation(s)
- Ghozlene Mekhloufi
- Laboratoire de Physico-chimie et Génie Alimentaires, ENSAIA-INPL, 2 avenue de la Forêt-de-Haye, BP 172, 54505 Vandoeuvre-lès-Nancy, France
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Simon M, Wittmar M, Bakowsky U, Kissel T. Self-Assembling Nanocomplexes from Insulin and Water-Soluble Branched Polyesters, Poly[(vinyl-3-(diethylamino)- propylcarbamate-co-(vinyl acetate)-co-(vinyl alcohol)]-graft- poly(l-lactic acid): A Novel Carrier for Transmucosal Delivery of Peptides. Bioconjug Chem 2004; 15:841-9. [PMID: 15264872 DOI: 10.1021/bc0341627] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The design of carriers for protein delivery that provide protection against enzymatic degradation and facilitate protein transport across epithelial surfaces, thus avoiding parenteral administration, remains a challenge. Self-assembling nanoscale protein/polymer complexes might present a promising approach. We synthesized water-soluble, amphiphilic polyesters, poly[(vinyl-3-(diethylamino)-propylcarbamate-co-(vinyl acetate)-co-(vinyl alcohol)]-graft-poly(L-lactic acid), containing a positively charged backbone, and studied the spontaneous formation of nanocomplexes (NC) with insulin. NC were characterized using dynamic light scattering, zeta-potential measurements, and atomic force microscopy (AFM). Insulin loading was determined with HPLC, and the binding constants were obtained by isothermal titration calorimetry (ITC). The NC formation was followed using nephelometric and light scattering techniques. Water-soluble, positively charged, branched polyesters with amphiphilic properties were obtained in a three-step polymer-analogous reaction. The degree of amine substitution, DS, in the PVAL backbone was varied between 0.04 and 0.5, and grafting this backbone with L-lactide increased the molecular weight from 18 kDa to 81 kDa. The polymer composition was optimized to facilitate NC formation with insulin resulting in a DS of 0.09 and a poly(L-lactide) side chain substitution of 0.5 with an average chain length of two lactic acids. Depending on polymer composition, stable NC of 200-500 nm diameter were formed with insulin, and the binding constants ranged from 4.7 x 10(5) to 9.5 x 10(6) M(-1). Positively charged surface charges ranging from +5 to +35mV and an insulin loading up to 98% of 33 IU/mL were obtained. The NC visualized by AFM revealed spheroidal particles with an entangled internal structure. It was demonstrated that this class of multifunctional polymers is capable of self-assembly with a peptidic substrate. The resulting nanosized complexes offer the potential for mucosal insulin/protein delivery and merit further investigations under in vivo conditions.
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Affiliation(s)
- M Simon
- Department of Pharmaceutics and Biopharmacy, Philipps-University, Ketzerbach 63, D-35037, Marburg, Germany
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Majhi PR, Dubin PL, Feng X, Guo X, Leermakers FAM, Tribet C. Coexistence of Spheres and Rods in Micellar Solution of Dodecyldimethylamine Oxide. J Phys Chem B 2004. [DOI: 10.1021/jp0374307] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Pinaki R. Majhi
- Department of Chemistry, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202
| | - Paul L. Dubin
- Department of Chemistry, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202
| | - Xianhua Feng
- Department of Chemistry, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202
| | - Xuhong Guo
- Department of Chemistry, Indiana University-Purdue University Indianapolis, 402 North Blackford Street, Indianapolis, Indiana 46202
| | - F. A. M. Leermakers
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
| | - Christophe Tribet
- Laboratoire de Physico-Chimie Macromoleculaire, Universite Paris 6, UMR 7615, ESPCI, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
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Porcar I, Codoñer A, Gómez CM, Abad C, Campos A. Interactions of quinine with polyacrylic and poly-L-glutamic acids in aqueous solutions. Eur Polym J 2004. [DOI: 10.1016/j.eurpolymj.2003.11.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Jönsson M, Skepö M, Tjerneld F, Linse P. Effect of Spatially Distributed Hydrophobic Surface Residues on Protein−Polymer Association. J Phys Chem B 2003. [DOI: 10.1021/jp0223253] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Malin Jönsson
- Biochemistry, Lund University, Box 124, SE-221 00 Lund, Sweden, and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden
| | - Marie Skepö
- Biochemistry, Lund University, Box 124, SE-221 00 Lund, Sweden, and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden
| | - Folke Tjerneld
- Biochemistry, Lund University, Box 124, SE-221 00 Lund, Sweden, and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden
| | - Per Linse
- Biochemistry, Lund University, Box 124, SE-221 00 Lund, Sweden, and Physical Chemistry 1, Lund University, Box 124, SE-221 00 Lund, Sweden
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Seyrek E, Dubin PL, Tribet C, Gamble EA. Ionic strength dependence of protein-polyelectrolyte interactions. Biomacromolecules 2003; 4:273-82. [PMID: 12625722 DOI: 10.1021/bm025664a] [Citation(s) in RCA: 322] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of univalent electrolyte concentration on protein-polyelectrolyte complex formation has been measured by frontal analysis continuous capillary electrophoresis (FACCE) and turbidimetry for the interaction of bovine serum albumin (BSA) with a synthetic hydrophobically modified polyacid, for BSA with (porcine mucosal) heparin (Hp), a highly charged polyanion, and for Hp and insulin. All three highly diverse systems display maxima or plateaus in complex formation in the range of ionic strength 5 < I < 30 mM, confirmed in the case of BSA-Hp by multiple techniques. Similar maxima are reported in the literature, but with little discussion, for BSA-poly(dimethyldiallylammonium chloride), lysozyme-hyaluronic acid, and lysozyme-chondroitin sulfate, always in the I range 5-30 mM. While inversion of salt effect has been discussed specifically for the interaction of gelatin and sodium polystyrenesulfonate with gelatin(28) and with beta-lactoglobulin,(10) the general nature of this phenomenon, regardless of polyelectrolyte origin, molecular weight, and charge sign has not been recognized. The position of the maxima and their occurrence when protein and polyelectrolyte have the same net charge imply that they arise when Debye lengths extend, at low I, beyond half the protein diameter so that addition of salt screens repulsions, as well as attractions. This appears to be a general effect caused by electrostatic repulsions that can coexist simultaneously with hydrophobic interactions. Modeling of protein electrostatics via Delphi is used to visualize this effect for BSA, lysozyme, insulin, and beta-lactoglobulin.
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Affiliation(s)
- Emek Seyrek
- Department of Chemistry, Indiana University-Purdue University at Indianapolis, 402 N. Blackford Street, Indiana 46202, USA
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Ladavière C, Toustou M, Gulik-Krzywicki T, Tribet C. Slow Reorganization of Small Phosphatidylcholine Vesicles upon Adsorption of Amphiphilic Polymers. J Colloid Interface Sci 2001; 241:178-187. [PMID: 11502120 DOI: 10.1006/jcis.2001.7675] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Static or dynamic light scattering measurements were performed in parallel, on dilute mixtures of DPPC/DPPA vesicles (typical radius 60 nm) and hydrophobically modified polymers. This technique gave evidence of the slow kinetics involved in both the reorganization of an adsorbed polymer layer and the membrane breakage. Hours, or sometimes days, were required in order to follow the variation of both the hydrodynamic radius and the scattering intensity at intermediate stages. Images of the intermediate species were collected using freeze-fracture electron microscopy (FFEM). Comparison of different polymers (of varying molecular weight or structure) revealed the prime importance of hydrophobicity on the disruption of membranes. Although the presence of a few percent of pendant alkyl chains along the polymer backbone induced adsorption to membranes, only the association with the more hydrophobic ones (>25 mol% of pendant octyl groups) resulted in small mixed objects of micellar size (radius about 10 nm). The drop of the mean radius of intermediate structures formed upon the vesicle breakage was also sensitive to temperature. A tentative mechanism was proposed on the basis of kinetics and FFEM studies. Copyright 2001 Academic Press.
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Affiliation(s)
- C. Ladavière
- Laboratoire de Physico-chimie Macromoléculaire, CNRS UMR 7615 et Université Paris 6, ESPCI, 10 rue Vauquelin, Paris, F-75005, France
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Currie EPK, M. A. Cohen Stuart, and, Borisov OV. Phase Separation in Polymer Solutions with Annealed Excluded Volume Interactions. Macromolecules 2001. [DOI: 10.1021/ma991540n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. P. K. Currie
- Department of Physical and Colloid Chemistry, University of Wageningen, 6703 HB Wageningen, The Netherlands; and ZOI/ZC, BASF AG, 67056 Ludwigshafen, Germany
| | - M. A. Cohen Stuart, and
- Department of Physical and Colloid Chemistry, University of Wageningen, 6703 HB Wageningen, The Netherlands; and ZOI/ZC, BASF AG, 67056 Ludwigshafen, Germany
| | - O. V. Borisov
- Department of Physical and Colloid Chemistry, University of Wageningen, 6703 HB Wageningen, The Netherlands; and ZOI/ZC, BASF AG, 67056 Ludwigshafen, Germany
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Champeil P, Menguy T, Tribet C, Popot JL, le Maire M. Interaction of amphipols with sarcoplasmic reticulum Ca2+-ATPase. J Biol Chem 2000; 275:18623-37. [PMID: 10747917 DOI: 10.1074/jbc.m000470200] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Amphipols are short-chain amphipathic polymers designed to keep membrane proteins soluble in aqueous solutions. We have evaluated the effects of the interaction of amphipols with sarcoplasmic reticulum Ca(2+)-ATPase either in a membrane-bound or a soluble form. If the addition of amphipols to detergent-solubilized ATPase was followed by removal of detergent, soluble complexes formed, but these complexes retained poor ATPase activity, were not very stable upon long incubation periods, and at high concentrations they experienced aggregation. Nevertheless, adding excess detergent to diluted detergent-free ATPase-amphipol complexes incubated for short periods immediately restored full activity to these complexes, showing that amphipols had protected solubilized ATPase from the rapid and irreversible inactivation that otherwise follows detergent removal. Amphipols also protected solubilized ATPase from the rapid and irreversible inactivation observed in detergent solutions if the ATPase Ca(2+) binding sites remain vacant. Moreover, in the presence of Ca(2+), amphipol/detergent mixtures stabilized concentrated ATPase against inactivation and aggregation, whether in the presence or absence of lipids, for much longer periods of time (days) than detergent alone. Our observations suggest that mixtures of amphipols and detergents are promising media for handling solubilized Ca(2+)-ATPase under conditions that would otherwise lead to its irreversible denaturation and/or aggregation.
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Affiliation(s)
- P Champeil
- Unité de Recherche Associée 2096 (CNRS et CEA) and Section de Biophysique des Protéines et des Membranes, Département de Biologie Cellulaire et Moléculaire, Commissariat à l'Energie Atomique Saclay, 91191 Gif-sur-Yvette Cedex, France
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Borrega R, Tribet C, Audebert R. Reversible Gelation in Hydrophobic Polyelectrolyte/Protein Mixtures: An Example of Cross-Links between Soft and Hard Colloids. Macromolecules 1999. [DOI: 10.1021/ma981872c] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- R. Borrega
- Laboratoire de Physico-chimie des Polymères UMR 7615, ESPCI, CNRS, Université Paris 6, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - C. Tribet
- Laboratoire de Physico-chimie des Polymères UMR 7615, ESPCI, CNRS, Université Paris 6, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
| | - R. Audebert
- Laboratoire de Physico-chimie des Polymères UMR 7615, ESPCI, CNRS, Université Paris 6, 10 rue Vauquelin, F-75231 Paris Cedex 05, France
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37
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Li M, Wu C. Self-Association of Poly(N-isopropylacrylamide) and Its Complexation with Gelatin in Aqueous Solution. Macromolecules 1999. [DOI: 10.1021/ma990085s] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mei Li
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, and The Open Laboratory for Bond Selective Chemistry, Department of Chemical Physics, University of Science & Technology of China, Hefei, Anhui, China
| | - Chi Wu
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong, and The Open Laboratory for Bond Selective Chemistry, Department of Chemical Physics, University of Science & Technology of China, Hefei, Anhui, China
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38
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Porcar I, Cottet H, Gareil P, Tribet C. Association between Protein Particles and Long Amphiphilic Polymers: Effect of the Polymer Hydrophobicity on Binding Isotherms. Macromolecules 1999. [DOI: 10.1021/ma981805i] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Iolanda Porcar
- Laboratoire de Physico-Chimie des Polymères, UMR CNRS 7615, ESPCI, Université Paris 6, 10 rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, UMR CNRS 7575, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
| | - Hervé Cottet
- Laboratoire de Physico-Chimie des Polymères, UMR CNRS 7615, ESPCI, Université Paris 6, 10 rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, UMR CNRS 7575, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
| | - Pierre Gareil
- Laboratoire de Physico-Chimie des Polymères, UMR CNRS 7615, ESPCI, Université Paris 6, 10 rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, UMR CNRS 7575, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
| | - Christophe Tribet
- Laboratoire de Physico-Chimie des Polymères, UMR CNRS 7615, ESPCI, Université Paris 6, 10 rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, UMR CNRS 7575, ENSCP, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
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Bromberg LE, Barr DP. Aggregation Phenomena in Aqueous Solutions of Hydrophobically Modified Polyelectrolytes. A Probe Solubilization Study. Macromolecules 1999. [DOI: 10.1021/ma981946k] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lev E. Bromberg
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Bruker Instruments, Inc., 19 Fortune Drive, Manning Park, Billerica, Massachusetts 01821
| | - David P. Barr
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, and Bruker Instruments, Inc., 19 Fortune Drive, Manning Park, Billerica, Massachusetts 01821
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40
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Bromberg L. Properties of Aqueous Solutions and Gels of Poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-g-poly(acrylic acid). J Phys Chem B 1998. [DOI: 10.1021/jp983162e] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lev Bromberg
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
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Porcar I, Gareil P, Tribet C. Formation of Complexes between Protein Particles and Long Amphiphilic Polymers: Binding Isotherms versus Size and Surface of the Particles. J Phys Chem B 1998. [DOI: 10.1021/jp9826625] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Iolanda Porcar
- Laboratoire de Physico-Chimie des Polymères UMR 7615, ESPCI, CNRS, University Paris 6, 10 Rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, CNRS UMR 7575, ENSCP, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
| | - Pierre Gareil
- Laboratoire de Physico-Chimie des Polymères UMR 7615, ESPCI, CNRS, University Paris 6, 10 Rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, CNRS UMR 7575, ENSCP, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
| | - Christophe Tribet
- Laboratoire de Physico-Chimie des Polymères UMR 7615, ESPCI, CNRS, University Paris 6, 10 Rue Vauquelin, 75231 Paris Cedex 05, France, and Laboratoire d'Electrochimie et de Chimie Analytique, CNRS UMR 7575, ENSCP, 11 Rue Pierre et Marie Curie, 75231 Paris Cedex 05, France
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Tribet C. Hydrophobically driven attachments of synthetic polymers onto surfaces of biological interest: lipid bilayers and globular proteins. Biochimie 1998; 80:461-73. [PMID: 9782386 DOI: 10.1016/s0300-9084(00)80013-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This paper gives a brief overview of the consequences of associations between amphiphilic water-soluble polymers and small colloidal particles of biological interest: proteins and vesicles. Typical structures of water-soluble synthetic polymers containing hydrophobic groups are presented. The segregation between polar and apolar units in these polymers induces self-organisation in micro-domains despite the lack of specific primary structure. In the presence of other amphiphilic particles like proteins and vesicles, mixed assemblies are formed. Examples of polymer associations with vesicles or globular proteins, mainly focused on the acrylic derivatives, bring out common features in these mixtures. When the size of the polymer is of the same order of magnitude as that of the particle, adsorption of polymer chains creates a protective layer around each individual particle. Depending on the hydrophobicity of the partners, the association can stabilise the dispersion of unmodified particles or induce structural changes (membrane disruption, leakage). When small particles are added to solutions of long polymers, multimolecular complexation occurs. In this case, the size of the resulting aggregates depends on the concentrations. It goes from the size of one polymer molecule up to formally infinity as revealed by gelation. The identification of non-specific association modes between biological nanoparticles and macromolecules might be revealed by the general behaviour of these synthetic mixed systems.
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Affiliation(s)
- C Tribet
- Laboratoire de Physico-chimie Macromoléculaire, CNRS-UMR 7615, Paris, France
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