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Mura M, Humphreys B, Gilbert J, Salis A, Nylander T. Cation and buffer specific effects on the DNA-lipid interaction. Colloids Surf B Biointerfaces 2023; 223:113187. [PMID: 36739672 DOI: 10.1016/j.colsurfb.2023.113187] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 01/26/2023] [Accepted: 01/30/2023] [Indexed: 02/04/2023]
Abstract
Knowledge of DNA - lipid layer interactions is key for the development of biosensors, synthetic nanopores, scaffolds, and gene-delivery systems. These interactions are strongly affected by the ionic composition of the solvent. We have combined quartz crystal microbalance (QCM) and ellipsometry measurements to reveal how pH, buffers and alkali metal chloride salts affect the interaction of DNA with lipid bilayers (DOTAP/DOPC 30:70 in moles). We found that the thickness of the DNA layer adsorbed onto the lipid bilayer decreased in the order citrate > phosphate > Tris > HEPES. The effect of cations on the thickness of the DNA layer decreased in the order (K+ > Na+ > Cs+ ∼ Li+). Rationalization of the experimental results requires that adsorption, due to cation specific charge screening, is driven by the simultaneous action of two mechanisms namely, the law of matching water affinities for kosmotropes (Li+) and ion dispersion forces for chaotropes (Cs+). The outcome of these two opposing mechanisms is a "bell-shaped" specific cations sequence. Moreover, a superimposed buffer specificity, which goes beyond the simple effect of pH regulation, further modulated cation specificity. In summary, DNA-lipid bilayer interactions are maximized if citrate buffer (50 mM, pH 7.4) and KCl (100 mM) are used.
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Affiliation(s)
- Monica Mura
- Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden; Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Via della Lastruccia 3, Sesto Fiorentino (FI), I-50019, Italy
| | - Ben Humphreys
- Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Jennifer Gilbert
- Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Via della Lastruccia 3, Sesto Fiorentino (FI), I-50019, Italy.
| | - Tommy Nylander
- Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
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2
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Hegaard F, Biro R, Ehtiati K, Thormann E. Ion-Specific Antipolyelectrolyte Effect on the Swelling Behavior of Polyzwitterionic Layers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:1456-1464. [PMID: 36656651 DOI: 10.1021/acs.langmuir.2c02798] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
In this study, we systematically investigate the interactions between mobile ions generated from added salts and immobile charges within a sulfobetaine-based polyzwitterionic film in the presence of five salts (KCl, KBr, KSCN, LiCl, and CsCl). The sulfobetaine groups contain quaternary alkylammonium and sulfonate groups, giving the positive and negative charges. The swelling of the zwitterionic film in the presence of different salts is compared with the swelling behavior of a polycationic or polyanionic film containing the same charged groups. For such a comparative study, we design cross-linked terpolymer films with similar thicknesses, cross-link densities, and charge fractions, but with varying charged moieties. While the addition of salt in general leads to a collapse of both cationic and anionic films, the presence of specific types of mobile anions (Cl-, Br-, and SCN-) considerably influences the swelling behavior of polycationic films. We attribute this observation to a different degree of ion-pair formations between the different types of anionic counterions and the immobile cationic quaternary alkylammonium groups in the films where highly polarizable counterions such as SCN- lead to a high degree of ion pairing and less polarizable counterions, such as Cl-, cause a low degree of ion pairing. Conversely, we do not observe any substantial effect of varying the type of cationic counterions (K+, Li+, and Cs+), which we assign to the lack of ion pairing between the weakly polarizable cations and the immobile anionic sulfonate groups in the films. In addition, we observe that the zwitterionic films swell with increasing ionic strength and the degree of swelling is anion dependent, which is in agreement with previous reports on the "antipolyelectrolyte effect". Herein, we explain this ion-specific swelling behavior with the different cation and anion abilities to form ion pairs with quaternary alkylammonium and sulfonate in the sulfobetaine groups.
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Affiliation(s)
- Frederik Hegaard
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Robert Biro
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Koosha Ehtiati
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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3
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Specific electrolyte effects on hemoglobin in denaturing medium investigated through electro spray ionization mass spectrometry. J Inorg Biochem 2022; 234:111872. [DOI: 10.1016/j.jinorgbio.2022.111872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/29/2022] [Accepted: 05/19/2022] [Indexed: 12/14/2022]
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4
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Dušeková E, Berta M, Sedláková D, Řeha D, Dzurillová V, Shaposhnikova A, Fadaei F, Tomková M, Minofar B, Sedlák E. Specific anion effect on properties of HRV 3C protease. Biophys Chem 2022; 287:106825. [PMID: 35597150 DOI: 10.1016/j.bpc.2022.106825] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 04/19/2022] [Accepted: 05/07/2022] [Indexed: 12/12/2022]
Abstract
Specific salts effect is intensively studied from the prospective of modification of different physico-chemical properties of biomacromolecules. Limited knowledge of the specific salts effect on enzymes led us to address the influence of five sodium anions: sulfate, phosphate, chloride, bromide, and perchlorate, on catalytic and conformational properties of human rhinovirus-14 (HRV) 3C protease. The enzyme conformation was monitored by circular dichroism spectrum (CD) and by tyrosines fluorescence. Stability and flexibility of the enzyme have been analyzed by CD in the far-UV region, differential scanning calorimetry and molecular dynamics simulations, respectively. We showed significant influence of the anions on the enzyme properties in accordance with the Hofmeister effect. The HRV 3C protease in the presence of kosmotropic anions, in contrast with chaotropic anions, exhibits increased stability, rigidity. Correlations of stabilization effect of anions on the enzyme with their charge density and the rate constant of the enzyme with the viscosity B-coefficients of anions suggest direct interaction of the anions with HRV 3C protease. The role of stabilization and decreased fluctuation of the polypeptide chain of HRV 3C protease on its activation in the presence of kosmotropic anions is discussed within the frame of the macromolecular rate theory.
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Affiliation(s)
- Eva Dušeková
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Martin Berta
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Dagmar Sedláková
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia; Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
| | - David Řeha
- Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31A, 37005 České Budějovice, Czech Republic
| | - Veronika Dzurillová
- Department of Biophysics, Faculty of Science, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Anastasiia Shaposhnikova
- Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31A, 37005 České Budějovice, Czech Republic; Laboratory of Structural Biology and Bioinformatics, Institute of Microbiology of the Czech Academy of Sciences, Zámek 136, 37333 Nové Hrady, Czech Republic
| | - Fatemeh Fadaei
- Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31A, 37005 České Budějovice, Czech Republic; Laboratory of Structural Biology and Bioinformatics, Institute of Microbiology of the Czech Academy of Sciences, Zámek 136, 37333 Nové Hrady, Czech Republic
| | - Mária Tomková
- Centre for Interdisciplinary Biosciences, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia
| | - Babak Minofar
- Faculty of Science, University of South Bohemia in České Budějovice, Branišovská 1645/31A, 37005 České Budějovice, Czech Republic.
| | - Erik Sedlák
- Centre for Interdisciplinary Biosciences, P. J. Šafárik University in Košice, Jesenná 5, 04154 Košice, Slovakia.
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Holec SAM, Liu SL, Woerman AL. Consequences of variability in α-synuclein fibril structure on strain biology. Acta Neuropathol 2022; 143:311-330. [PMID: 35122113 DOI: 10.1007/s00401-022-02403-w] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 01/26/2022] [Accepted: 01/27/2022] [Indexed: 12/15/2022]
Abstract
Synucleinopathies are a group of clinically and neuropathologically distinct protein misfolding diseases caused by unique α-synuclein conformations, or strains. While multiple atomic resolution cryo-electron microscopy structures of α-synuclein fibrils are now deposited in Protein Data Bank, significant gaps in the biological consequences arising from each conformation have yet to be unraveled. Mutations in the α-synuclein gene (SNCA), cofactors, and the solvation environment contribute to the formation and maintenance of each disease-causing strain. This review highlights the impact of each of these factors on α-synuclein misfolding and discusses the implications of the resulting structural variability on therapeutic development.
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Affiliation(s)
- Sara A M Holec
- Department of Biology, Institute for Applied Life Sciences, University of Massachusetts Amherst, Amherst, MA, USA
| | - Samantha L Liu
- Department of Biology, Institute for Applied Life Sciences, University of Massachusetts Amherst, Amherst, MA, USA
- Molecular and Cellular Biology Program, Dartmouth College, Hanover, NH, USA
| | - Amanda L Woerman
- Department of Biology, Institute for Applied Life Sciences, University of Massachusetts Amherst, Amherst, MA, USA.
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6
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Chaudhary S, Kaur H, Kaur H, Rana B, Tomar D, Jena KC. Probing the Bovine Hemoglobin Adsorption Process and its Influence on Interfacial Water Structure at the Air-Water Interface. APPLIED SPECTROSCOPY 2021; 75:1497-1509. [PMID: 34346774 DOI: 10.1177/00037028211035157] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
*These authors contributed equally to this work.The molecular-level insight of protein adsorption and its kinetics at interfaces is crucial because of its multifold role in diverse fundamental biological processes and applications. In the present study, the sum frequency generation (SFG) vibrational spectroscopy has been employed to demonstrate the adsorption process of bovine hemoglobin (BHb) protein molecules at the air-water interface at interfacial isoelectric point of the protein. It has been observed that surface coverage of BHb molecules significantly influences the arrangement of the protein molecules at the interface. The time-dependent SFG studies at two different frequencies in the fingerprint region elucidate the kinetics of protein denaturation process and its influence on the hydrogen-bonding network of interfacial water molecules at the air-water interface. The initial growth kinetics suggests the synchronized behavior of protein adsorption process with the structural changes in the interfacial water molecules. Interestingly, both the events carry similar characteristic time constants. However, the conformational changes in the protein structure due to the denaturation process stay for a long time, whereas the changes in water structure reconcile quickly. It is revealed that the protein denaturation process is followed by the advent of strongly hydrogen-bonded water molecules at the interface. In addition, we have also carried out the surface tension kinetics measurements to complement the findings of our SFG spectroscopic results.
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Affiliation(s)
- Shilpi Chaudhary
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India
- Department of Applied Sciences, Punjab Engineering College (Deemed to be University), Chandigarh, India
| | - Harsharan Kaur
- Department of Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, India
| | - Harpreet Kaur
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India
| | - Bhawna Rana
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India
| | - Deepak Tomar
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India
| | - Kailash C Jena
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, India
- Department of Biomedical Engineering, Indian Institute of Technology Ropar, Rupnagar, India
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7
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Ribeiro SS, Castro TG, Gomes CM, Marcos JC. Hofmeister effects on protein stability are dependent on the nature of the unfolded state. Phys Chem Chem Phys 2021; 23:25210-25225. [PMID: 34730580 DOI: 10.1039/d1cp02477a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interpretation of a salt's effect on protein stability traditionally discriminates low concentration regimes (<0.3 M), dominated by electrostatic forces, and high concentration regimes, generally described by ion-specific Hofmeister effects. However, increased theoretical and experimental studies have highlighted observations of the Hofmeister phenomena at concentration ranges as low as 0.001 M. Reasonable quantitative predictions of such observations have been successfully achieved throughout the inclusion of ion dispersion forces in classical electrostatic theories. This molecular description is also on the basis of quantitative estimates obtained resorting to surface/bulk solvent partition models developed for ion-specific Hofmeister effects. However, the latter are limited by the availability of reliable structures representative of the unfolded state. Here, we use myoglobin as a model to explore how ion-dependency on the nature of the unfolded state affects protein stability, combining spectroscopic techniques with molecular dynamic simulations. To this end, the thermal and chemical stability of myoglobin was assessed in the presence of three different salts (NaCl, (NH4)2SO4 and Na2SO4), at physiologically relevant concentrations (0-0.3 M). We observed mild destabilization of the native state induced by each ion, attributed to unfavorable neutralization and hydrogen-bonding with the protein side-chains. Both effects, combined with binding of Na+, Cl- and SO42- to the thermally unfolded state, resulted in an overall destabilization of the protein. Contrastingly, ion binding was hindered in the chemically unfolded conformation, due to occupation of the binding sites by urea molecules. Such mechanistic action led to a lower degree of destabilization, promoting surface tension effects that stabilized myoglobin according to the Hofmeister series. Therefore, we demonstrate that Hofmeister effects on protein stability are modulated by the heterogeneous physico-chemical nature of the unfolded state. Altogether, our findings evidence the need to characterize the structure of the unfolded state when attempting to dissect the molecular mechanisms underlying the effects of salts on protein stability.
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Affiliation(s)
- Sara S Ribeiro
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Tarsila G Castro
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Cláudio M Gomes
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências and Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - João C Marcos
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
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8
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Duignan TT, Zhao XS. Prediction of the Osmotic/Activity Coefficients of Alkali Hydroxide Electrolytes. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy T. Duignan
- School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane 4072, Australia
| | - X. S. Zhao
- School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane 4072, Australia
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9
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Takács D, Katana B, Szerlauth A, Sebők D, Tomšič M, Szilágyi I. Influence of adsorption of ionic liquid constituents on the stability of layered double hydroxide colloids. SOFT MATTER 2021; 17:9116-9124. [PMID: 34569591 DOI: 10.1039/d1sm01074c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The influence of ionic liquid (IL) anions and cations on the charging and aggregation properties of layered double hydroxide (LDH) nanoparticles was systematically studied. Surface charge characteristics were explored using zeta potential measurements, while aggregation processes were followed in dynamic light scattering experiments in aqueous IL solutions. The results revealed that the aggregation rates of LDHs were sensitive to the composition of ILs leading to IL-dependent critical coagulation concentration (CCC) values being obtained. The origin of the interparticle forces was found to be electrostatic, in line with the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, as the experimental aggregation kinetics were in good agreement with the predicted data. The ion specific adsorption of IL anions led to different surface charge densities for LDHs, which decreased in the order Cl- > Br- > DCA- > SCN- > NO3- for counterions and BMIM+ > BMPYR+ > BMPY+ > BMPIP+ in the case of coions resulting in weaker electrical double layer repulsion in these sequences. Since van der Waals forces are always present and their strength does not depend significantly on the ionic strength, the CCC values decreased in the above order. The present results shed light on the importance of the interfacial arrangement of the IL constituent ions on the colloidal stability of particle dispersions and provide important information on the design of stable or unstable particle-ionic liquid systems.
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Affiliation(s)
- Dóra Takács
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary.
| | - Bojana Katana
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary.
| | - Adél Szerlauth
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary.
| | - Dániel Sebők
- Department of Applied and Environmental Chemistry, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary
| | - Matija Tomšič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - István Szilágyi
- MTA-SZTE Lendület Biocolloids Research Group, Department of Physical Chemistry and Materials Science, University of Szeged, 1 Rerrich Béla tér, H-6720 Szeged, Hungary.
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Pan T, Li J, Li B, Xu Q, Cui Z, Shang J, Ge Y, Qi Z. Guanidinium-Responsive Crown Ether-Based Macrocyclic Amphiphile in Aqueous Medium. J Phys Chem Lett 2021; 12:7418-7422. [PMID: 34330157 DOI: 10.1021/acs.jpclett.0c02994] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supramolecular assemblies based on oligo(ethylene glycol) (OEG) building blocks are well-known for their neutral chemical property and thermal-responsive behavior. Here, the cyclic "CLOSED" and linear "OPEN" typologies of OEGs led to dramatic difference in the sensitivity to guanidinium-containing species. From thermodynamic studies, the association constant (Ka) between the "CLOSED" form amphiphile and guanidinium salt was determined to be 28.7 M-1, whereas there was no detectable binding affinity for the "OPEN" form. Therefore, considering ion specificity, the present results establish that crown ether derivatives with "CLOSED" and "OPEN" topologies provide an easy-to-access model pair with designed ion-recognition sites and special functional moieties and geometries (like the binding pockets of enzymes or ion channels in cellular members) that allow the manipulation of the intercrossed relationship between supramolecular solutes, waters, and guanidinium salts. These supramolecular forces in aqueous solution offered an alternative strategy to fabricate thermal-responsive systems in ionic medium.
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Affiliation(s)
- Tiezheng Pan
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Jiangbo Li
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Bo Li
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Qiangqiang Xu
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Zhiliyu Cui
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Jie Shang
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Yan Ge
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
| | - Zhenhui Qi
- School of Life Sciences, Sino-German Joint Research Lab for Space Biomaterials and Translational Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China
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11
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Saharia J, Bandara YMNDY, Karawdeniya BI, Hammond C, Alexandrakis G, Kim MJ. Modulation of electrophoresis, electroosmosis and diffusion for electrical transport of proteins through a solid-state nanopore. RSC Adv 2021; 11:24398-24409. [PMID: 34354824 PMCID: PMC8285365 DOI: 10.1039/d1ra03903b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 07/03/2021] [Indexed: 01/01/2023] Open
Abstract
Nanopore probing of molecular level transport of proteins is strongly influenced by electrolyte type, concentration, and solution pH. As a result, electrolyte chemistry and applied voltage are critical for protein transport and impact, for example, capture rate (CR), transport mechanism (i.e., electrophoresis, electroosmosis or diffusion), and 3D conformation (e.g., chaotropic vs. kosmotropic effects). In this study, we explored these using 0.5–4 M LiCl and KCl electrolytes with holo-human serum transferrin (hSTf) protein as the model protein in both low (±50 mV) and high (±400 mV) electric field regimes. Unlike in KCl, where events were purely electrophoretic, the transport in LiCl transitioned from electrophoretic to electroosmotic with decreasing salt concentration while intermediate concentrations (i.e., 2 M and 2.5 M) were influenced by diffusion. Segregating diffusion-limited capture rate (Rdiff) into electrophoretic (Rdiff,EP) and electroosmotic (Rdiff,EO) components provided an approach to calculate the zeta-potential of hSTf (ζhSTf) with the aid of CR and zeta potential of the nanopore surface (ζpore) with (ζpore–ζhSTf) governing the transport mechanism. Scrutinization of the conventional excluded volume model revealed its shortcomings in capturing surface contributions and a new model was then developed to fit the translocation characteristics of proteins. Figure shows hSTf protein translocating through a solid-state nanopore under an applied electric field and the resulting current traces. The transport mechanism is determined by the interplay of electrophoretic and electroosmotic force.![]()
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Affiliation(s)
- Jugal Saharia
- Department of Mechanical Engineering, Southern Methodist University Dallas TX 75275 USA
| | - Y M Nuwan D Y Bandara
- Department of Mechanical Engineering, Southern Methodist University Dallas TX 75275 USA
| | - Buddini I Karawdeniya
- Department of Mechanical Engineering, Southern Methodist University Dallas TX 75275 USA
| | - Cassandra Hammond
- Department of Mechanical Engineering, Southern Methodist University Dallas TX 75275 USA
| | - George Alexandrakis
- Department of Bioengineering, University of Texas at Arlington Arlington TX 76019 USA
| | - Min Jun Kim
- Department of Mechanical Engineering, Southern Methodist University Dallas TX 75275 USA
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12
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Travers W, Kelleher F. Studies of the highly potent lantibiotic peptide nisin Z in aqueous solutions of salts and biological buffer components. Biophys Chem 2021; 274:106603. [PMID: 33945991 DOI: 10.1016/j.bpc.2021.106603] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/16/2021] [Accepted: 04/22/2021] [Indexed: 12/20/2022]
Abstract
The lantibiotic nisin, usually used as a 2.5%w/w in NaCl and milk solids, has activity against a wide range of Gram-positive bacteria, especially food-borne pathogens, and has been used as a food preservative for decades without the development of significant resistance. It has been reported that the high purity (>95%) nisin Z form has activity against the Gram-negative speciesE. coli, which is significantly reduced in the presence of NaCl. This current study examined, by1H NMR spectroscopy, the effects of NaCl, and a range of other salts, on the observed aqueous solution1H NMR spectra of nisin Z in the pH 3-4 range, where nisin Z has its maximum stability. Nisin's mechanism of action involves binding to the polyoxygenated pyrophosphate moiety of lipid II, and in acidic solution the positively charged C-terminus region is reported to interact with the negative sulfate groups of SDS micelles, so the study was extended to include a number of polyoxygenated anions commonly used as buffers in many biological assays. In general, the biggest changes found were in the chemical shifts of protons in the hydrophobic N-terminus region, rather than the more polar C-terminus region. The effects seen on the addition of the salts (cations and anions) were not just an overall non-specific ionic strength effect, as different salts caused different effects, in an unpredictive manner. Similarly, the polyoxygenated anions behaved differently and not predictably, and neither the cations/anions, or polyoxygenated anions, constitute a Hofmeister or inverse Hofmeister series.
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Affiliation(s)
- Wayne Travers
- Molecular Design & Synthesis Group, Centre of Applied Science for Health, TU Dublin Tallaght, Dublin D24 FKT9, Ireland
| | - Fintan Kelleher
- Molecular Design & Synthesis Group, Centre of Applied Science for Health, TU Dublin Tallaght, Dublin D24 FKT9, Ireland.
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13
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Lian L, Liu L, Ding Y, Hua Z, Liu G. Specific Anion Effects on Charged-Neutral Random Copolymers: Interplay between Different Anion-Polymer Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1697-1706. [PMID: 33499598 DOI: 10.1021/acs.langmuir.0c02907] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The study of ion specificities of charged-neutral random copolymers is of great importance for understanding specific ion effects on natural macromolecules. In the present work, we have investigated the specific anion effects on the thermoresponsive behavior of poly([2-(methacryloyloxy)ethyl trimethylammonium chloride]-co-N-isopropylacrylamide) [P(METAC-co-NIPAM)] random copolymers. Our study demonstrates that the anion specificities of the P(METAC-co-NIPAM) copolymers are dependent on their chemical compositions. The specific anion effects on the copolymers with high mole fractions of poly(N-isopropylacrylamide) (PNIPAM) are similar to those on the PNIPAM homopolymer. As the mole fraction of PNIPAM decreases to a certain value, a V-shaped anion series can be observed in terms of the anion-specific cloud point temperature of the copolymer, as induced by the interplay between different anion-polymer interactions. Our study also suggests that both the direct and the indirect anion-polymer interactions contribute to the anion specificities of the copolymers. This work would improve our understanding of the relationship between the ion specificities and the ion-macromolecule interactions for naturally occurring macromolecules.
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Affiliation(s)
- Leilei Lian
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Lvdan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yanwei Ding
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zan Hua
- Biomass Molecular Engineering Center, Department of Materials Science and Engineering, Anhui Agricultural University, Hefei 230036, P. R. China
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
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14
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Salis A, Cappai L, Carucci C, Parsons DF, Monduzzi M. Specific Buffer Effects on the Intermolecular Interactions among Protein Molecules at Physiological pH. J Phys Chem Lett 2020; 11:6805-6811. [PMID: 32787211 DOI: 10.1021/acs.jpclett.0c01900] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
BSA and lysozyme molecular motion at pH 7.15 is buffer-specific. Adsorption of buffer ions on protein surfaces modulates the protein surface charge and thus protein-protein interactions. Interactions were estimated by means of the interaction parameter kD obtained from plots of diffusion coefficients at different protein concentrations (Dapp = D0[1 + kDCprotein]) via dynamic light scattering and nuclear magnetic resonance. The obtained results agree with recent findings confirming doubts regarding the validity of the Henderson-Hasselbalch equation, which has traditionally provided a basis for understanding pH buffers of primary importance in solution chemistry, electrochemistry, and biochemistry.
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Affiliation(s)
- Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
| | - Luca Cappai
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
| | - Cristina Carucci
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
| | - Drew F Parsons
- Discipline of Chemistry and Physics, College of Science, Health, Engineering & Education, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - Maura Monduzzi
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
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15
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Collu M, Carucci C, Salis A. Specific Anion Effects on Lipase Adsorption and Enzymatic Synthesis of Biodiesel in Nonaqueous Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:9465-9471. [PMID: 32640792 DOI: 10.1021/acs.langmuir.0c01330] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Pseudomonas fluorescens lipase (Pfl) was adsorbed on macroporous polypropylene to obtain a heterogeneous biocatalyst. The effect of NaCl concentration and of different 100 mm sodium salts on the Pfl loading and catalytic performance toward biodiesel synthesis via the solvent-free methanolysis of triglycerides was studied. Although lipase adsorption onto polypropylene is governed by hydrophobic interactions, both salt concentration and anion type affect lipase loading. Protein loading decreased along the series: Cl- > SO42- ≈ no salt > Br- > I- > SCN- > F- > AcO-. This nonmonotonic ion-specific trend can be the result of opposite mechanisms occurring during the adsorption step. A similar trend is observed also for triglyceride conversion and biodiesel yield. It is likely that ions affect the microenvironment of the adsorbed lipase by interacting specifically with the hydration water and polypeptide chains, thus affecting enzyme catalysis.
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Affiliation(s)
- Michela Collu
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Cristina Carucci
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
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16
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17
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Carucci C, Raccis F, Salis A, Magner E. Specific ion effects on the enzymatic activity of alcohol dehydrogenase fromSaccharomyces cerevisiae. Phys Chem Chem Phys 2020; 22:6749-6754. [DOI: 10.1039/c9cp06800g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The specific activity andVmax, but notKm, of alcohol dehydrogenase fromSaccharomyces cerevisiaeare ion specific.
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Affiliation(s)
- Cristina Carucci
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
| | - Francesco Raccis
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
| | - Andrea Salis
- Department of Chemical and Geological Sciences
- University of Cagliari
- CSGI & CNBS
- Cittadella Universitaria
- 09042 Monserrato (CA)
| | - Edmond Magner
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
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18
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Sedlák E, Sedláková D, Marek J, Hančár J, Garajová K, Žoldák G. Ion-Specific Protein/Water Interface Determines the Hofmeister Effect on the Kinetic Stability of Glucose Oxidase. J Phys Chem B 2019; 123:7965-7973. [DOI: 10.1021/acs.jpcb.9b05195] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Erik Sedlák
- Center for Interdisciplinary Biosciences, Technology and Innovation Park P.J. Šafárik University, Jesenna 5, 041 54 Košice, Slovakia
- Department of Biochemistry, Faculty of Science, P. J. Šafárik University in Košice, Moyzesova 11, 04001 Košice, Slovakia
| | - Dagmar Sedláková
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia
| | - Jozef Marek
- Department of Biophysics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia
| | - Jozef Hančár
- Department of Biochemistry, Faculty of Science, P. J. Šafárik University in Košice, Moyzesova 11, 04001 Košice, Slovakia
| | - Katarína Garajová
- Department of Biochemistry, Faculty of Science, P. J. Šafárik University in Košice, Moyzesova 11, 04001 Košice, Slovakia
| | - Gabriel Žoldák
- Center for Interdisciplinary Biosciences, Technology and Innovation Park P.J. Šafárik University, Jesenna 5, 041 54 Košice, Slovakia
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19
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Adachi T, Tsujimura S. Effects of electrolyte on the mediated electrocatalytic glucose oxidation reaction catalyzed by flavin adenine dinucleotide glucose dehydrogenase. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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20
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Parsons DF, Salis A. A thermodynamic correction to the theory of competitive chemisorption of ions at surface sites with nonelectrostatic physisorption. J Chem Phys 2019; 151:024701. [DOI: 10.1063/1.5096237] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Drew F. Parsons
- College of Science, Health, Engineering & Education, Murdoch University, 90 South St., Murdoch, WA 6150, Australia
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Unità Operativa Univ. Cagliari, Italy and Centro NanoBiotecnologie Sardegna (CNBS), Unità Operativa Univ. Cagliari,Italy
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21
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Gregory KP, Webber GB, Wanless EJ, Page AJ. Lewis Strength Determines Specific-Ion Effects in Aqueous and Nonaqueous Solvents. J Phys Chem A 2019; 123:6420-6429. [DOI: 10.1021/acs.jpca.9b04004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kasimir P. Gregory
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Grant B. Webber
- School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia
- Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Erica J. Wanless
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
- Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Alister J. Page
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
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22
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Chang H, Gnanasekaran K, Gianneschi NC, Geiger FM. Bacterial Model Membranes Deform (resp. Persist) upon Ni2+ Binding to Inner Core (resp. O-Antigen) of Lipopolysaccharides. J Phys Chem B 2019; 123:4258-4270. [DOI: 10.1021/acs.jpcb.9b02762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- HanByul Chang
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Karthikeyan Gnanasekaran
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Nathan C. Gianneschi
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Franz M. Geiger
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
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23
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Friedman R. Specific Ion and Concentration Effects in Acetate Solutions with Na + , K + and Cs .. Chemphyschem 2019; 20:1006-1010. [PMID: 30817057 DOI: 10.1002/cphc.201900163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 02/27/2019] [Indexed: 11/10/2022]
Abstract
How salt ions affect solutes and the water beyond the solvation shell is not well understood. Molecular dynamics simulations of alkali-acetate solutions were analysed here in order to examine if, and how, different cations and solute concentrations affect the water structure and the interactions between water and acetates. The results revealed that water structure is perturbed to more than 1 nm away from the acetates and that this effect is more pronounced in physiological than in molar electrolyte concentrations. Analysis of simulations of a soluble protein revealed that the water orientation is perturbed to at least 1.5 nm from the protein structure. Furthermore, modifications to the orientation of water around carboxylate side chains were shown to depend on the local environment on the protein surface, and could extend to well over 1 nm, which may have an effect on protein dynamics during MD simulations in small water boxes.
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Affiliation(s)
- Ran Friedman
- Department of Chemistry and Biomedical Sciences, Linnaeus University, Kalmar, SE-391 82, Sweden
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24
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Liu G. Tuning the Properties of Charged Polymers at the Solid/Liquid Interface with Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3232-3247. [PMID: 29806944 DOI: 10.1021/acs.langmuir.8b01158] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In conventional theories, where ions are treated as point charges, the properties of charged polymers can be tuned using ions via the ionic strength. However, this article will show that the properties of charged polymers at the solid/liquid interface, including charged polymer brushes and polyelectrolyte multilayers, can be tuned by ions beyond ionic strength effects. Ion specificity, multivalency, ionic hydrogen bonding, and ionic hydrophobicity/hydrophilicity are used to tune a range of properties of charged polymers at the solid/liquid interface such as hydration, conformation, stiffness, surface wettability, lubricity, adhesion, and protein adsorption. The ionic effects demonstrated here greatly broaden our understanding of the use of ions to tune the interfacial properties of charged polymers. It is anticipated that these ionic effects can be further expanded by incorporating new types of important ion-charged polymer interactions and can also be extended to neutral polymer systems.
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Affiliation(s)
- Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
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25
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Liu C, Wang Y, Gao Y, Zhang Y, Zhao L, Xu B, Romsted LS. Effects of interfacial specific cations and water molarities on AOT micelle-to-vesicle transitions by chemical trapping: the specific ion-pair/hydration model. Phys Chem Chem Phys 2019; 21:8633-8644. [DOI: 10.1039/c8cp05987j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Added salts induce micelle-to-vesicle transitions at specific cation concentrations in Hofmeister order by forming polar headgroup–counterion pairs that release water.
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Affiliation(s)
- Changyao Liu
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yuzhao Wang
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yanfei Gao
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Yongliang Zhang
- Department of Chemistry and Chemical Biology, Rutgers
- The State University of New Jersey
- USA
| | - Li Zhao
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Baocai Xu
- School of Food and Chemical Engineering
- Beijing Technology and Business University
- Beijing
- People's Republic of China
| | - Laurence S. Romsted
- Department of Chemistry and Chemical Biology, Rutgers
- The State University of New Jersey
- USA
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26
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Biernacki KA, Kaczkowska E, Bruździak P. Aqueous solutions of NMA, Na2HPO4, and NaH2PO4 as models for interaction studies in phosphate–protein systems. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.104] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Zhu R, Baraniak MK, Jäkle F, Liu G. Anion Specificity in Dimethyl Sulfoxide-Water Mixtures Exemplified by a Thermosensitive Polymer. J Phys Chem B 2018; 122:8293-8300. [PMID: 30086631 DOI: 10.1021/acs.jpcb.8b06125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In the present work, we have investigated the anion-specific upper critical solution temperature (UCST) behavior of polymer-supported borinic acid (PBA) in dimethyl sulfoxide-water (DMSO-H2O) mixtures. An inverted V-shaped series CH3COO- < Cl- < salt-free > NO3- > ClO4- > SCN- is observed in terms of the anion-specific UCST of PBA in the DMSO-H2O mixtures. Both direct anion-polymer interactions and indirect solvent-mediated anion-polymer interactions are involved in the specific anion effect on the UCST behavior of PBA. The direct binding of anions to the PBA surface generates a salting-in effect on PBA, causing the UCST for the different types of anions to increase from chaotropic to kosmotropic anions due to the stronger binding of the more chaotropic anions. On the other hand, the indirect anionic polarization of hydrogen bonding between PBA and DMSO molecules also produces a salting-in effect on PBA, leading the UCST for the different types of anions to increase from kosmotropic to chaotropic anions because of the stronger capability of the more kosmotropic anions to polarize the hydrogen bonding. Thus, the dominating anion-PBA interactions change from the direct anion binding to the indirect anionic polarization of hydrogen bonding as the anions change from chaotropes to kosmotropes. The observed inverted V-shaped series suggests that the specific anion effect on the UCST behavior of PBA in the DMSO-H2O mixtures is determined by the combined effects of the binding of anions to the PBA surface and the anionic polarization of hydrogen bonding between PBA and DMSO molecules.
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Affiliation(s)
- Renwei Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
| | - Monika K Baraniak
- Department of Chemistry , Rutgers University-Newark , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Frieder Jäkle
- Department of Chemistry , Rutgers University-Newark , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
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28
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Monoclonal antibody-based ELISA for the quantification of porcine hemoglobin in meat products. Food Chem 2018; 250:170-179. [DOI: 10.1016/j.foodchem.2018.01.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 09/26/2017] [Accepted: 01/02/2018] [Indexed: 11/24/2022]
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29
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Li S, Ye S, Liu G. Specific Ion Effects on Protein Thermal Aggregation from Dilute Solutions to Crowded Environments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4289-4297. [PMID: 29566333 DOI: 10.1021/acs.langmuir.8b00294] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We have investigated specific ion effects on protein thermal aggregation from dilute solutions to crowded environments. Ovalbumin and poly(ethylene glycol) have been employed as the model protein and crowding agent, respectively. Our studies demonstrate that the rate-limiting step of ovalbumin thermal aggregation is changed from the aggregation of unfolded protein molecules to the unfolding of the protein molecules, when the solution conditions are varied from a dilute solution to a crowded environment. The specific ion effects acting on the thermal aggregation of ovalbumin generated by kosmotropic and chaotropic ions are different. The thermal aggregation of ovalbumin molecules is promoted by kosmotropic anions in dilute solutions via an increase in protein hydrophobic interactions. In contrast, ovalbumin thermal aggregation is facilitated by chaotropic ions in crowded environments through accelerated unfolding of protein molecules. Therefore, there are distinct mechanisms causing the ion specificities of protein thermal aggregation between dilute solutions and crowded environments. The ion specificities are dominated by ion-specific hydrophobic interactions between protein molecules and ion-specific unfolding of protein molecules in dilute solutions and crowded environments, respectively.
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Affiliation(s)
- Shuling Li
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
| | - Shuji Ye
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
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30
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Qi Z, Chiappisi L, Gong H, Pan R, Cui N, Ge Y, Böttcher C, Dong S. Ion Selectivity in Nonpolymeric Thermosensitive Systems Induced by Water-Attenuated Supramolecular Recognition. Chemistry 2018; 24:3854-3861. [DOI: 10.1002/chem.201705838] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Indexed: 01/02/2023]
Affiliation(s)
- Zhenhui Qi
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology; School of Life Sciences; Northwestern Polytechnical University; 127 Youyi Xilu, Xi'an Shaanxi 710072 P. R. China
| | - Leonardo Chiappisi
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie; Institut für Chemie; Technische Universität Berlin; Strasse des 17. Juni 124, Sekr. TC7 D-10623 Berlin Germany
- Institut Max von Laue-Paul Langevin; 71 Avenue des Martyrs 38042 Grenoble Cedex 9 France
| | - Hanlin Gong
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology; School of Life Sciences; Northwestern Polytechnical University; 127 Youyi Xilu, Xi'an Shaanxi 710072 P. R. China
| | - Ren Pan
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology; School of Life Sciences; Northwestern Polytechnical University; 127 Youyi Xilu, Xi'an Shaanxi 710072 P. R. China
| | - Ning Cui
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology; School of Life Sciences; Northwestern Polytechnical University; 127 Youyi Xilu, Xi'an Shaanxi 710072 P. R. China
| | - Yan Ge
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology; School of Life Sciences; Northwestern Polytechnical University; 127 Youyi Xilu, Xi'an Shaanxi 710072 P. R. China
| | - Christoph Böttcher
- Research Center for Electron Microscopy, BioSupraMol; Institut für Chemie und Biochemie; Freie Universität Berlin; Fabeckstr. 36a 14195 Berlin Germany
| | - Shengyi Dong
- College of Chemistry and Chemical Engineering; Hunan University; Changsha 410082 Hunan P. R. China
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31
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Fernández–d'Arlas B, Huertos MÁ, Müller AJ. Ion-macromolecule interactions studied with model polyurethanes. J Colloid Interface Sci 2018; 509:102-112. [DOI: 10.1016/j.jcis.2017.08.099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 08/29/2017] [Accepted: 08/30/2017] [Indexed: 11/25/2022]
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32
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Ion specific hydration in nano-confined electrical double layers. J Colloid Interface Sci 2017; 506:263-270. [DOI: 10.1016/j.jcis.2017.07.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/11/2017] [Accepted: 07/13/2017] [Indexed: 11/15/2022]
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33
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Carucci C, Salis A, Magner E. Specific Ion Effects on the Mediated Oxidation of NADH. ChemElectroChem 2017. [DOI: 10.1002/celc.201700672] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Cristina Carucci
- Department of Chemical Sciences, Synthesis and Solid State Pharmaceutical Centre, Bernal Institute; University of Limerick; Limerick Ireland
| | - Andrea Salis
- Department of Chemical and Geological Sciences; University of Cagliari; Cittadella Universitaria, SS 554 bivio Sestu 09042 Monserrato (CA) Italy
| | - Edmond Magner
- Department of Chemical Sciences, Synthesis and Solid State Pharmaceutical Centre, Bernal Institute; University of Limerick; Limerick Ireland
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34
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Buffer formulation affects the interaction between lysozyme and polymeric nanoparticles. J Colloid Interface Sci 2017; 504:78-85. [DOI: 10.1016/j.jcis.2017.05.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/11/2017] [Accepted: 05/11/2017] [Indexed: 11/21/2022]
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35
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Diao Y, Han M, Lopez-Berganza JA, Valentino L, Marinas B, Espinosa-Marzal RM. Reconciling DLVO and non-DLVO Forces and Their Implications for Ion Rejection by a Polyamide Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8982-8992. [PMID: 28771012 DOI: 10.1021/acs.langmuir.7b02306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recognizing the significance of surface interactions for ion rejection and membrane fouling in nanofiltration, we revise the theories of DLVO (named after Derjaguin, Landau, Verwey, and Overbeek) and non-DLVO forces in the context of polyamide active layers. Using an atomic force microscope, surface forces between polyamide active layers and a micrometer-large and smooth silica colloid were measured in electrolyte solutions of representative monovalent and divalent ions. While the analysis of DLVO forces, accounting for surface roughness, provides how surface charge of the active layer changes with electrolyte concentration, scrutiny of non-DLVO hydration forces gives molecular insight into the composition of the membrane-solution interface. Importantly, we report an expansion of the diffuse layer at high ionic strength, consistent with the recent development of the electrical double layer theory, but in contrast to the widely accepted phenomenon of aggregation in the secondary minimum. Further, the enhanced repulsion acting on modified membranes via polyelectrolyte adsorption can be quantitatively predicted by DLVO and non-DLVO forces. This work serves to solve past misunderstandings about the interaction forces acting on nanofiltration membranes, and it provides guidance for future work on the relation between surface properties and rejection mechanisms and fouling.
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Affiliation(s)
- Yijue Diao
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Mengwei Han
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Josue A Lopez-Berganza
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Lauren Valentino
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Benito Marinas
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Rosa M Espinosa-Marzal
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
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36
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Parsons DF, Duignan TT, Salis A. Cation effects on haemoglobin aggregation: balance of chemisorption against physisorption of ions. Interface Focus 2017. [PMID: 28630674 DOI: 10.1098/rsfs.2016.0137] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A theoretical model of haemoglobin is presented to explain an anomalous cationic Hofmeister effect observed in protein aggregation. The model quantifies competing proposed mechanisms of non-electrostatic physisorption and chemisorption. Non-electrostatic physisorption is stronger for larger, more polarizable ions with a Hofmeister series Li+< K+< Cs+. Chemisorption at carboxylate groups is stronger for smaller kosmotropic ions, with the reverse series Li+ > K+ > Cs+. We assess aggregation using second virial coefficients calculated from theoretical protein-protein interaction energies. Taking Cs+ to not chemisorb, comparison with experiment yields mildly repulsive cation-carboxylate binding energies of 0.48 kBT for Li+ and 3.0 kBT for K+. Aggregation behaviour is predominantly controlled by short-range protein interactions. Overall, adsorption of the K+ ion in the middle of the Hofmeister series is stronger than ions at either extreme since it includes contributions from both physisorption and chemisorption. This results in stronger attractive forces and greater aggregation with K+, leading to the non-conventional Hofmeister series K+ > Cs+ ≈ Li+.
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Affiliation(s)
- Drew F Parsons
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia
| | - Timothy T Duignan
- Physical Science Division, Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato (CA), Italy
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37
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Sharker KK, Islam MN, Das S. Counterion Effect on Krafft Temperature and Related Properties of Octadecyltrimethylammonium Bromide. J SURFACTANTS DETERG 2017. [DOI: 10.1007/s11743-017-1957-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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38
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Benítez AJ, Walther A. Counterion Size and Nature Control Structural and Mechanical Response in Cellulose Nanofibril Nanopapers. Biomacromolecules 2017; 18:1642-1653. [DOI: 10.1021/acs.biomac.7b00263] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alejandro J. Benítez
- Institute for Macromolecular
Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 31, 79104 Freiburg, Germany
- Freiburg Materials
Research Center, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany
- Freiburg Center
for Interactive Materials and Bioinspired Technologies, Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany
| | - Andreas Walther
- Institute for Macromolecular
Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 31, 79104 Freiburg, Germany
- Freiburg Materials
Research Center, Albert-Ludwigs-University Freiburg, Stefan-Meier-Straße 21, 79104 Freiburg, Germany
- Freiburg Center
for Interactive Materials and Bioinspired Technologies, Albert-Ludwigs-University Freiburg, Georges-Köhler-Allee 105, 79110 Freiburg, Germany
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39
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Kalyuzhnyi YV, Vlachy V. Explicit-water theory for the salt-specific effects and Hofmeister series in protein solutions. J Chem Phys 2017; 144:215101. [PMID: 27276970 DOI: 10.1063/1.4953067] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Effects of addition of salts on stability of aqueous protein solutions are studied theoretically and the results are compared with experimental data. In our approach, all the interacting species, proteins, ions, and water molecules, are accounted for explicitly. Water molecules are modeled as hard spheres with four off-center attractive square-well sites. These sites serve to bind either another water or to solvate the ions or protein charges. The ions are represented as charged hard spheres, and decorated by attractive sites to allow solvation. Spherical proteins simultaneously possess positive and negative groups, represented by charged hard spheres, attached to the surface of the protein. The attractive square-well sites, mimicking the protein-protein van der Waals interaction, are located on the surface of the protein. To obtain numerical results, we utilized the energy route of Wertheim's associative mean spherical approximation. From measurable properties, we choose to calculate the second virial coefficient B2, which is closely related to the tendency of proteins to aggregate and eventually crystalize. Calculations are in agreement with experimental trends: (i) For low concentration of added salt, the alkali halide salts follow the inverse Hofmeister series. (ii) At higher concentration of added salt, the trend is reversed. (iii) When cations are varied, the salts follow the direct Hofmeister series. (iv) In contrast to the colloidal theories, our approach correctly predicts the non-monotonic behavior of B2 upon addition of salts. (v) With respect to anions, the theory predicts for the B2 values to follow different sequences below and above the iso-ionic point, as also confirmed experimentally. (vi) A semi-quantitative agreement between measured and calculated values for the second virial coefficient, as functions of pH of solution and added salt type and concentration, is obtained.
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Affiliation(s)
- Yuriy V Kalyuzhnyi
- Institute for Condensed Matter Physics, NASU, Svientsitskoho 1, 79011 Lviv, Ukraine
| | - Vojko Vlachy
- Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
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Murdoch TJ, Willott JD, de Vos WM, Nelson A, Prescott SW, Wanless EJ, Webber GB. Influence of Anion Hydrophilicity on the Conformation of a Hydrophobic Weak Polyelectrolyte Brush. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01897] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Timothy J. Murdoch
- Priority Research
Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Joshua D. Willott
- Priority Research
Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Wiebe M. de Vos
- Membrane Science
and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, Netherlands
| | - Andrew Nelson
- Australian
Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Stuart W. Prescott
- School of Chemical Engineering, UNSW Australia, UNSW Sydney, NSW 2052, Australia
| | - Erica J. Wanless
- Priority Research
Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Grant B. Webber
- Priority Research
Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
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41
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Salis A, Monduzzi M. Not only pH. Specific buffer effects in biological systems. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.04.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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42
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Hofmeister effects at low salt concentration due to surface charge transfer. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.05.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Salis A, Fanti M, Medda L, Nairi V, Cugia F, Piludu M, Sogos V, Monduzzi M. Mesoporous Silica Nanoparticles Functionalized with Hyaluronic Acid and Chitosan Biopolymers. Effect of Functionalization on Cell Internalization. ACS Biomater Sci Eng 2016; 2:741-751. [PMID: 33440571 DOI: 10.1021/acsbiomaterials.5b00502] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mesoporous silica nanoparticles (MSNs), based on the MCM-41 matrix, were functionalized with amino groups, and then with hyaluronic acid (HA) or chitosan (CHIT) to fabricate bioactive conjugates. The role of the functional groups toward cytotoxicity and cellular uptake was investigated using 3T3 mouse fibroblast cells. A very high biocompatibility of MSN-NH2, MSN-HA and MSN-CHIT matrices was assessed through the MTS biological assay and Coulter counter evaluation. No significant differences in cytotoxicity data arise from the presence of different functional groups in the investigated MSNs. Fluorescence microscopy experiments performed using fluorescein isothiocyanate-conjugated MSN-NH2, MSN-HA, and MSN-CHIT, and transmission electron microscopy experiments performed on slices of the investigated systems embedded in epoxy resins give evidence of significant differences due to type of functionalization in terms of cellular uptake and stability of the particles in the biological medium. MSN-NH2 and MSN-HA conjugates are easily internalized, the uptake of the HA-functionalized MSNs being much higher than that of the -NH2-functionalized MSNs. Differently, MSN-CHIT conjugates tend to give large aggregates dispersed in the medium or localized at the external surface of the cell membranes. Both fluorescence microscopy and TEM images show that the MSNs are distributed in the cytoplasm of the cells in the case of MSN-NH2 and MSN-HA, whereas only a few particles are internalized in the case of MSN-CHIT. Flow cytometry experiments confirmed quantitatively the selectively high cellular uptake of MSN-HA particles.
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Affiliation(s)
- Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Maura Fanti
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato Cagliari, Italy
| | - Luca Medda
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Valentina Nairi
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Francesca Cugia
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Marco Piludu
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato Cagliari, Italy
| | - Valeria Sogos
- Department of Biomedical Sciences, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato Cagliari, Italy
| | - Maura Monduzzi
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
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44
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Das K, Kundu S, Mehan S, Aswal V. Modified interactions among globular proteins below isoelectric point in the presence of mono-, di- and tri-valent ions: A small angle neutron scattering study. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.12.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Cugia F, Sedda S, Pitzalis F, Parsons DF, Monduzzi M, Salis A. Are specific buffer effects the new frontier of Hofmeister phenomena? Insights from lysozyme adsorption on ordered mesoporous silica. RSC Adv 2016. [DOI: 10.1039/c6ra17356j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Different 10 mM buffers at the same nominal pH affect specifically the adsorption of lysozyme on ordered mesoporous silica. It emerges that specific buffer effects should be considered within ‘Hofmeister phenomena’.
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Affiliation(s)
- Francesca Cugia
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Silvia Sedda
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Federica Pitzalis
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Drew F. Parsons
- School of Engineering and Information Technology
- Murdoch University
- Australia
| | - Maura Monduzzi
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Andrea Salis
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
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46
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Effect of electrolytes on proteins physisorption on ordered mesoporous silica materials. Colloids Surf B Biointerfaces 2016; 137:77-90. [DOI: 10.1016/j.colsurfb.2015.04.068] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 04/28/2015] [Accepted: 04/30/2015] [Indexed: 01/26/2023]
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47
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The impact of nonelectrostatic physisorption of ions on free energies and forces between redox electrodes: ion-specific repulsive peaks. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.12.090] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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48
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Duignan TT, Parsons DF, Ninham BW. A continuum solvent model of ion-ion interactions in water. Phys Chem Chem Phys 2015; 16:22014-27. [PMID: 25205066 DOI: 10.1039/c4cp02822h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The calculation of ion-ion interactions in water is a problem of long standing importance. Modelling these interactions is a prerequisite to explaining Hofmeister (specific ion) effects. We here generalize our solvation model of ions to calculate the free energy of two ions in water as a function of separation. The same procedure has previously been applied to calculate ion interactions with the air-water interface successfully. The Conductor like Screening Model (COSMO) is used. This treats the ions on a quantum mechanical level and calculates numerically the electrostatic response of the surrounding solvent. Estimates of the change in the cavity formation energy and the change in the ion-water dispersion energy as the ions approach are included separately. The calculated interaction potentials are too attractive and this is a significant issue. However, they do reproduce the affinity of similarly sized ions for each other, which is a crucial property of these potentials. They are also oscillatory, another important property. We normalize the potentials to reduce the over-attraction, and good correlation with experimental values is achieved. We identify the driving contributions to this like-prefers-like behaviour. We then put forward a plausible hypothesis for the over-attraction of the potentials. An agreeable feature of our approach is that it does not rely on salt specific parameters deliberately adjusted to reproduce experimental values.
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Affiliation(s)
- Timothy T Duignan
- Applied Mathematics Department, Australian National University, Canberra, ACT 0200, Australia.
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49
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The electrostatic behavior of the bacterial cell wall using a smoothing function to describe the charge-regulated volume charge density profile. Colloids Surf B Biointerfaces 2015; 134:447-52. [PMID: 26231737 DOI: 10.1016/j.colsurfb.2015.06.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Revised: 05/25/2015] [Accepted: 06/30/2015] [Indexed: 02/05/2023]
Abstract
The Donnan potential can be observed in many biological systems due to the presence of polyelectrolytes as proteins and nucleic acids. The aim of this work was to present a useful tool to describe the fixed and charge-regulated volume charge density profile through the use of a smoothing function and to obtain the electrostatic potential profile as well as the Donnan potential of this system by solving Poisson-Boltzmann (PB) equation. When we use the smoothing function, the Donnan potential arises automatically from the solution of only one Poisson-Boltzmann equation and it is not necessary to impose this potential for treating charged system in the presence of a membrane. The electrostatic behavior across the Bacillus brevis wall considering the dependence on the ionization of the cell wall functional groups as a function of the solution pH was analyzed. An important issue was to show that potentiometric titration data could be used together with the Poisson-Boltzmann equation to predict the electrostatic behavior (e.g., zeta potential) of the bacterial cell surface.
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50
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Jha I, Kumar A, Venkatesu P. The Overriding Roles of Concentration and Hydrophobic Effect on Structure and Stability of Heme Protein Induced by Imidazolium-Based Ionic Liquids. J Phys Chem B 2015; 119:8357-68. [DOI: 10.1021/acs.jpcb.5b04660] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Indrani Jha
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | - Awanish Kumar
- Department of Chemistry, University of Delhi, Delhi 110 007, India
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