1
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Mura M, Carucci C, Caddeo E, Sovová Š, Piludu M, Pekař M, Jachimska B, Parsons DF, Salis A. Specific buffer effects on the formation of BSA protein corona around amino-functionalized mesoporous silica nanoparticles. J Colloid Interface Sci 2024; 677:540-547. [PMID: 39106779 DOI: 10.1016/j.jcis.2024.07.258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 07/13/2024] [Accepted: 07/31/2024] [Indexed: 08/09/2024]
Abstract
The effect of buffer species on biomolecules and biomolecule-nanoparticle interactions is a phenomenon that has been either neglected, or not understood. Here, we study the formation of a BSA protein corona (PC) around amino-functionalized mesoporous silica nanoparticles (MSN-NH2) in the presence of different buffers (Tris, BES, cacodylate, phosphate, and citrate) at the same pH (7.15) and different concentrations (10, 50, and 100 mM). We find that BSA adsorption is buffer specific, with the adsorbed amount of BSA being 4.4 times higher in the presence of 100 mM Tris (184 ± 3 mg/g) than for 100 mM citrate (42 ± 2 mg/g). That is a considerable difference that cannot be explained by conventional theories. The results become clearer if the interaction energies between BSA and MSN-NH2, considering the electric double layer (EEDL) and the van der Waals (EvdW) terms, are evaluated. The buffer specific PC derives from buffer specific zeta potentials that, for MSN-NH2, are positive with Tris and negative with citrate buffers. A reversed sign of zeta potentials can be obtained by considering polarizability-dependent dispersion forces acting together with electrostatics to give the buffer specific outcome. These results are relevant not only to our understanding of the formation of the PC but may also apply to other bio- and nanosystems in biological media.
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Affiliation(s)
- Monica Mura
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Cristina Carucci
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Elena Caddeo
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Šárka Sovová
- Faculty of Chemistry, Brno University of Technology, Purkynova 464/118, 612 00 Brno, Czechia
| | - Marco Piludu
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Miloslav Pekař
- Faculty of Chemistry, Brno University of Technology, Purkynova 464/118, 612 00 Brno, Czechia
| | - Barbara Jachimska
- Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences, Krakow, Poland
| | - Drew F Parsons
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari &CSGI, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy.
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2
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Panagopoulou C, Skotadis E, Aslanidis E, Tzourmana G, Rapesi A, Tsioustas C, Kainourgiaki M, Kleitsiotis G, Tsekenis G, Tsoukalas D. Non-Faradaic Impedimetric Detection of Heavy Metal Ions via a Hybrid Nanoparticle-DNAzyme Biosensor. BIOSENSORS 2024; 14:321. [PMID: 39056597 PMCID: PMC11274724 DOI: 10.3390/bios14070321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 06/21/2024] [Accepted: 06/24/2024] [Indexed: 07/28/2024]
Abstract
Due to rapid industrialization, novel water-quality monitoring techniques for the detection of highly toxic and hazardous heavy metal ions are essential. Herein, a hybrid noble nanoparticle/DNAzyme electrochemical biosensor is proposed for the simultaneous and label-free detection of Pb2+ and Cr3+ in aqueous solutions. The sensor is based on the combination of a two-dimensional naked-platinum nanoparticle film and DNAzymes, whose double-helix configuration disassembles into smaller fragments in the presence of target-specific heavy metal ions. The electrochemical behavior of the fabricated sensor was investigated with non-faradaic electrochemical impedance spectroscopy (EIS), resulting in the successful detection of Pb2+ and Cr3+ well below their maximum permitted levels in tap water. So far, there has been no report on the successful detection of heavy metal ions utilizing the non-faradaic electrochemical impedance spectroscopy technique based on advanced nanomaterials paired with DNAzymes. This is also one of the few reports on the successful detection of chromium (III) via a sensor incorporating DNAzymes.
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Affiliation(s)
- Chrysi Panagopoulou
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - Evangelos Skotadis
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
- Department of Biomedical Engineering, The University of West Attica, 12243 Athens, Greece
| | - Evangelos Aslanidis
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
- Microelectronics Research Group (MRG), Institute of Electronic Structure and Laser (IESL), Foundation of Research & Technology Hellas (FORTH), 70013 Heraklion, Greece
| | - Georgia Tzourmana
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - Annita Rapesi
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - Charalampos Tsioustas
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - Maria Kainourgiaki
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - Georgios Kleitsiotis
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
| | - George Tsekenis
- Biomedical Research Foundation of the Academy of Athens, 11527 Athens, Greece;
| | - Dimitrios Tsoukalas
- Department of Applied Physics, National Technical University of Athens, 15780 Athens, Greece; (C.P.); or (E.A.); (G.T.); (A.R.); (C.T.); (M.K.); (G.K.); (D.T.)
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3
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Swanson P, Arnold GP, Curley CE, Wakita SC, Waters JDV, Balog ERM. Understanding the Phase Behavior of a Multistimuli-Responsive Elastin-like Polymer: Insights from Dynamic Light Scattering Analysis. J Phys Chem B 2024; 128:5756-5765. [PMID: 38830627 PMCID: PMC11181320 DOI: 10.1021/acs.jpcb.4c00070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 04/08/2024] [Accepted: 04/30/2024] [Indexed: 06/05/2024]
Abstract
Elastin-like polymers are a class of stimuli-responsive protein polymers that hold immense promise in applications such as drug delivery, hydrogels, and biosensors. Yet, understanding the intricate interplay of factors influencing their stimuli-responsive behavior remains a challenging frontier. Using temperature-controlled dynamic light scattering and zeta potential measurements, we investigate the interactions between buffer, pH, salt, water, and protein using an elastin-like polymer containing ionizable lysine residues. We observed the elevation of transition temperature in the presence of the common buffering agent HEPES at low concentrations, suggesting a "salting-in" effect of HEPES as a cosolute through weak association with the protein. Our findings motivate a more comprehensive investigation of the influence of buffer and other cosolute molecules on elastin-like polymer behavior.
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Affiliation(s)
- Peter
C. Swanson
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
| | - Galen P. Arnold
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
| | - Carolyn E. Curley
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
| | - Savannah C. Wakita
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
| | - Jeffery D. V. Waters
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
| | - Eva Rose M. Balog
- School of Mathematical and
Physical Sciences, University of New England, Biddeford, Maine 04005, United States
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Schulke S, Nolten M, Schwaab G, Havenith M. Studying Local Electrostatics by Terahertz Spectroscopy Using Amines as a Probe. Chemphyschem 2024; 25:e202300389. [PMID: 37897334 DOI: 10.1002/cphc.202300389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 09/20/2023] [Accepted: 10/26/2023] [Indexed: 10/30/2023]
Abstract
In a previous study[1] we could show that a large amplitude mode of the zwitterion glycine can serve as a sensitive probe for protonation and allows to deduce local pKa values. Here we show that the underlying concept is more general: We present the results of a pH dependent measurement of Terahertz-FTIR (THz-FTIR) spectra of solvated amines, i. e. Diethylamine (DEA), Triethylamine (TEA), and Diisopropylamine (DiPA). We show that amines serve as a sensitive, label free probe for local protonation. Protonation of the amines yield intensity changes which can be quantified by precise THz spectroscopy (30 cm-1 -450 cm-1 ). A detailed analysis allows us to correlate the titration spectra of solvated amines in the THz range with pKa values. This demonstrates the potential of THz spectroscopy to probe the charge state of biomolecules in water in a label free manner.
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Affiliation(s)
- Simon Schulke
- Physical Chemistry 2, Ruhr-Univeristy Bochum, Universitaetsstraße 150, 44801, Bochum, Germany
| | - Melinda Nolten
- Physical Chemistry 2, Ruhr-Univeristy Bochum, Universitaetsstraße 150, 44801, Bochum, Germany
| | - Gerhard Schwaab
- Physical Chemistry 2, Ruhr-Univeristy Bochum, Universitaetsstraße 150, 44801, Bochum, Germany
| | - Martina Havenith
- Physical Chemistry 2, Ruhr-Univeristy Bochum, Universitaetsstraße 150, 44801, Bochum, Germany
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Chatzigeorgiou S, Jílková J, Korecká L, Janyšková R, Hermannová M, Šimek M, Čožíková D, Slováková M, Bílková Z, Bobek J, Černý Z, Čihák M, Velebný V. Preparation of hyaluronan oligosaccharides by a prokaryotic beta-glucuronidase: Characterization of free and immobilized forms of the enzyme. Carbohydr Polym 2023; 317:121078. [PMID: 37364952 DOI: 10.1016/j.carbpol.2023.121078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/28/2023]
Abstract
Popularity of hyaluronan (HA) in the cosmetics and pharmaceutical industries, led to the investigation and development of new HA-based materials, with enzymes playing a key role. Beta-D-glucuronidases catalyze the hydrolysis of a beta-D-glucuronic acid residue from the non-reducing end of various substrates. However, lack of specificity towards HA for most beta-D-glucuronidases, in addition to the high cost and low purity of those active on HA, have prevented their widespread application. In this study, we investigated a recombinant beta-glucuronidase from Bacteroides fragilis (rBfGUS). We demonstrated the rBfGUS's activity on native, modified, and derivatized HA oligosaccharides (oHAs). Using chromogenic beta-glucuronidase substrate and oHAs, we characterized the enzyme's optimal conditions and kinetic parameters. Additionally, we evaluated rBfGUS's activity towards oHAs of various sizes and types. To increase reusability and ensure the preparation of enzyme-free oHA products, rBfGUS was immobilized on two types of magnetic macroporous bead cellulose particles. Both immobilized forms of rBfGUS demonstrated suitable operational and storage stabilities, and their activity parameters were comparable to the free form. Our findings suggest that native and derivatized oHAs can be prepared using this bacterial beta-glucuronidase, and a novel biocatalyst with enhanced operational parameters has been developed with a potential for industrial use.
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Affiliation(s)
- Sofia Chatzigeorgiou
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic; Institute of Immunology and Microbiology, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Jana Jílková
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic; Department of Biochemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic.
| | - Lucie Korecká
- Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic.
| | - Radka Janyšková
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic
| | | | - Matej Šimek
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic
| | - Dagmar Čožíková
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic
| | - Marcela Slováková
- Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Zuzana Bílková
- Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice, Czech Republic
| | - Jan Bobek
- Institute of Immunology and Microbiology, 1st Faculty of Medicine, Charles University, Prague, Czech Republic; Faculty of Science, Jan Evangelista Purkyně University in Ústí nad Labem, České mládeže 8, 400 96 Ústí nad Labem, Czech Republic; Faculty of Biomedical Engineering, Czech Technical University in Prague, Sítná sq. 3105, 272 01 Kladno, Czech Republic
| | - Zbyněk Černý
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic
| | - Matouš Čihák
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic; Institute of Immunology and Microbiology, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
| | - Vladimír Velebný
- Contipro a.s., Dolní Dobrouč 401, 56102 Dolní Dobrouč, Czech Republic
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Giurlani W, Fidi A, Anselmi E, Pizzetti F, Bonechi M, Carretti E, Lo Nostro P, Innocenti M. SPECIFIC ION EFFECTS ON COPPER ELECTROPLATING. Colloids Surf B Biointerfaces 2023; 225:113287. [PMID: 37004387 DOI: 10.1016/j.colsurfb.2023.113287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 03/16/2023] [Accepted: 03/28/2023] [Indexed: 03/31/2023]
Abstract
The main goal of this work is to open new perspectives in the field of electrodeposition and provide green alternatives to the electroplating industry. The effect of different anions (SO42-, ClO3-, NO3-, ClO4-, BF4-, PF6-) in solution on the electrodeposition of copper was investigated. The solutions, containing only the copper precursor and the background electrolyte, were tailored to minimize the environmental impact and reduce the use of organic additives and surfactants. The study is based on electrochemical measurements carried out to verify that no metal complexation takes place. We assessed the nucleation and growth mechanism, we performed a morphological characterization through scanning electron microscopy and deposition efficiency by measuring the film thickness through X-ray fluorescence spectroscopy. Significant differences in the growth mechanism and in the morphology of the electrodeposited films, were observed as a function of the background electrolyte.
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Affiliation(s)
- Walter Giurlani
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; INSTM, Via G. Giusti 9, 50121 Firenze (FI), Italy
| | - Alberto Fidi
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Erasmo Anselmi
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Federico Pizzetti
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
| | - Marco Bonechi
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; INSTM, Via G. Giusti 9, 50121 Firenze (FI), Italy
| | - Emiliano Carretti
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy
| | - Pierandrea Lo Nostro
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy.
| | - Massimo Innocenti
- Dept. Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy; INSTM, Via G. Giusti 9, 50121 Firenze (FI), Italy; CSGI, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy; ICCOM - CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy.
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7
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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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8
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Yap WY, Loo LW, Sha HX, Hwang JS. Enhanced production of recombinant HALT-1 pore-forming toxin using two-step chromatographic procedure. MethodsX 2023; 10:102073. [PMID: 36865650 PMCID: PMC9971028 DOI: 10.1016/j.mex.2023.102073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 02/08/2023] [Indexed: 02/13/2023] Open
Abstract
Hydra actinoporin-like toxin-1 (HALT-1) has been isolated from Hydra magnipapillata and is highly cytolytic against various human cells including erythrocyte. Previously, recombinant HALT-1 (rHALT-1) was expressed in Escherichia coli and purified by the nickel affinity chromatography. In this study, we improved the purification of rHALT-1 by two-step purifications. Bacterial cell lysate containing rHALT-1 was subjected to the sulphopropyl (SP) cation exchange chromatography with different buffers, pHs, and NaCl concentrations. The results indicated that both phosphate and acetate buffers facilitated the strong binding of rHALT-1 to SP resins, and the buffers containing 150 mM and 200 mM NaCl, respectively, removed protein impurities but retain most rHALT-1 in the column. When combining the nickel affinity chromatography and the SP cation exchange chromatography, the purity of rHALT-1 was highly enhanced. In subsequent cytotoxicity assays, 50% of cells could be lysed at ∼18 and ∼22 µg/mL of rHALT-1 purified with phosphate and acetate buffers, respectively.•HALT-1 is a soluble α-pore-forming toxin of 18.38 kDa.•rHALT-1 was purified by nickel affinity chromatography followed by SP cation exchange chromatography.•The cytotoxicity of purified rHALT-1 using 2-step purifications via either phosphate or acetate buffer was comparable to those previously reported.
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Affiliation(s)
- Wei Yuen Yap
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia
| | - Lok Wenn Loo
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia
| | - Hong Xi Sha
- Department of Biological Sciences, School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia
| | - Jung Shan Hwang
- Department of Medical Sciences, School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia,Corresponding author.
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9
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The melting curves of calf thymus-DNA are buffer specific. J Colloid Interface Sci 2023; 630:193-201. [DOI: 10.1016/j.jcis.2022.10.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/27/2022] [Accepted: 10/04/2022] [Indexed: 11/06/2022]
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10
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Baccile N, Lorthioir C, Ba AA, Le Griel P, Pérez J, Hermida-Merino D, Soetaert W, Roelants SLKW. Topological Connection between Vesicles and Nanotubes in Single-Molecule Lipid Membranes Driven by Head-Tail Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14574-14587. [PMID: 36410028 DOI: 10.1021/acs.langmuir.2c01824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Lipid nanotube-vesicle networks are important channels for intercellular communication and transport of matter. Experimentally observed in neighboring mammalian cells but also reproduced in model membrane systems, a broad consensus exists on their formation and stability. Lipid membranes must be composed of at least two molecular components, each stabilizing low (generally a phospholipid) and high curvatures. Strong anisotropy or enhanced conical shape of the second amphiphile is crucial for the formation of nanotunnels. Anisotropic driving forces generally favor nanotube protrusions from vesicles. In this work, we report the unique case of topologically connected nanotubes-vesicles obtained in the absence of directional forces, in single-molecule membranes, composed of an anisotropic bolaform glucolipid, above its melting temperature, Tm. Cryo-TEM and fluorescence confocal microscopy show the interconnection between vesicles and nanotubes in a single-phase region, between 60 and 90 °C under diluted conditions. Solid-state NMR demonstrates that the glucolipid can assume two distinct configurations, head-head and head-tail. These arrangements, seemingly of comparable energy above the Tm, could explain the existence and stability of the topologically connected vesicles and nanotubes, which are generally not observed for classical single-molecule phospholipid-based membranes above their Tm.
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Affiliation(s)
- Niki Baccile
- Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Sorbonne Université, Paris75005, France
| | - Cédric Lorthioir
- Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Sorbonne Université, Paris75005, France
| | - Abdoul Aziz Ba
- Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Sorbonne Université, Paris75005, France
| | - Patrick Le Griel
- Centre National de la Recherche Scientifique, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Sorbonne Université, Paris75005, France
| | - Javier Pérez
- Synchrotron Soleil, L'Orme des Merisiers, Saint-Aubin, BP48, Gif-sur-Yvette Cedex91192, France
| | - Daniel Hermida-Merino
- Netherlands Organisation for Scientific Research (NWO), DUBBLE@ESRF BP CS40220, Grenoble38043, France
- Departamento de Física Aplicada, CINBIO, Universidade de Vigo, Campus Lagoas-Marcosende, Vigo36310, Spain
| | - Wim Soetaert
- InBio, Department of Biotechnology, Ghent University, Ghent9000, Belgium
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11
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Zhang H, Sun X, Wang J, Dong M, Li L, Bai F, Xu K, Wang L. Sodium caseinate decorating on shellac nanoparticles as a stabilizer for the encapsulation of quercetin. Food Chem 2022; 395:133580. [DOI: 10.1016/j.foodchem.2022.133580] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 06/22/2022] [Accepted: 06/24/2022] [Indexed: 11/04/2022]
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12
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A Biophysical Study of DNA Condensation Mediated by Histones and Protamines. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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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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14
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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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15
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Lusci G, Pivetta T, Carucci C, Parsons DF, Salis A, Monduzzi M. BSA fragmentation specifically induced by added electrolytes: An electrospray ionization mass spectrometry investigation. Colloids Surf B Biointerfaces 2022; 218:112726. [PMID: 35914467 DOI: 10.1016/j.colsurfb.2022.112726] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 07/16/2022] [Accepted: 07/24/2022] [Indexed: 10/16/2022]
Abstract
Biointerfaces are significantly affected by electrolytes according to the Hofmeister series. This work reports a systematic investigation on the effect of different metal chlorides, sodium and potassium bromides, iodides and thiocyanates, on the ESI/MS spectra of bovine serum albumin (BSA) in aqueous solution at pH = 2.7. The concentration of each salt was varied to maximize the quality of the ESI/MS spectrum, in terms of peak intensity and bell-shaped profile. The ESI/MS spectra of BSA in the absence and in the presence of salts showed a main protein pattern characterized by the expected mass of 66.5 kDa, except the case of BSA/RbCl (mass 65.3 kDa). In all systems we observed an additional pattern, characterized by at least three peaks with low intensity, whose deconvolution led to suggest the formation of a BSA fragment with a mass of 19.2 kDa. Only NaCl increased the intensity of the peaks of the main BSA pattern, while minimizing that of the fragment. NaCl addition seems to play a crucial role in stabilizing the BSA ionized interface against hydrolysis of peptide bonds, through different synergistic mechanisms. To quantify the observed specific electrolyte effects, two "Hofmeister" parameters (Hs and Ps) are proposed. They are obtained using the ratio of (BSA-Salt)/BSA peak intensities for both the BSA main pattern and for its fragment. SYNOPSIS: NaCl stabilizes BSA ion and almost prevents fragmentation due to denaturing pH.
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Affiliation(s)
- Gloria Lusci
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Tiziana Pivetta
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Cristina Carucci
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
| | - Drew Francis Parsons
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
| | - Andrea Salis
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
| | - Maura Monduzzi
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
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16
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Physicochemical characterization of green sodium oleate-based formulations. Part 2. Effect of anions. J Colloid Interface Sci 2022; 617:399-408. [DOI: 10.1016/j.jcis.2022.01.135] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 01/20/2022] [Accepted: 01/21/2022] [Indexed: 11/23/2022]
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17
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Inam W, Bhadane R, Akpolat RN, Taiseer RA, Filippov SK, Salo‐Ahen OMH, Rosenholm JM, Zhang H. Interactions between polymeric nanoparticles and different buffers as investigated by zeta potential measurements and molecular dynamics simulations. VIEW 2022. [DOI: 10.1002/viw.20210009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Affiliation(s)
- Wali Inam
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
- Turku Bioscience Centre University of Turku and Åbo Akademi University Turku Finland
| | - Rajendra Bhadane
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
- Structural Bioinformatics Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
| | - Rukiye Nur Akpolat
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
- Department of Pharmacy Ministry of Health Alaca Public Hospital Alaca Corum Turkey
| | - Rifahul Abrar Taiseer
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
| | - Sergey K. Filippov
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
| | - Outi M. H. Salo‐Ahen
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
- Structural Bioinformatics Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
| | - Jessica M Rosenholm
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
| | - Hongbo Zhang
- Pharmaceutical Sciences Laboratory Faculty of Science and Engineering Åbo Akademi University Turku Finland
- Turku Bioscience Centre University of Turku and Åbo Akademi University Turku Finland
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18
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Gregory KP, Elliott GR, Robertson H, Kumar A, Wanless EJ, Webber GB, Craig VSJ, Andersson GG, Page AJ. Understanding specific ion effects and the Hofmeister series. Phys Chem Chem Phys 2022; 24:12682-12718. [PMID: 35543205 DOI: 10.1039/d2cp00847e] [Citation(s) in RCA: 87] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Specific ion effects (SIE), encompassing the Hofmeister Series, have been known for more than 130 years since Hofmeister and Lewith's foundational work. SIEs are ubiquitous and are observed across the medical, biological, chemical and industrial sciences. Nevertheless, no general predictive theory has yet been able to explain ion specificity across these fields; it remains impossible to predict when, how, and to what magnitude, a SIE will be observed. In part, this is due to the complexity of real systems in which ions, counterions, solvents and cosolutes all play varying roles, which give rise to anomalies and reversals in anticipated SIEs. Herein we review the historical explanations for SIE in water and the key ion properties that have been attributed to them. Systems where the Hofmeister series is perturbed or reversed are explored, as is the behaviour of ions at the liquid-vapour interface. We discuss SIEs in mixed electrolytes, nonaqueous solvents, and in highly concentrated electrolyte solutions - exciting frontiers in this field with particular relevance to biological and electrochemical applications. We conclude the perspective by summarising the challenges and opportunities facing this SIE research that highlight potential pathways towards a general predictive theory of SIE.
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Affiliation(s)
- Kasimir P Gregory
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia. .,Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Gareth R Elliott
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
| | - Hayden Robertson
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
| | - Anand Kumar
- Flinders Institute of Nanoscale Science and Technology, College of Science and Engineering, Flinders University, South Australia 5001, Australia
| | - Erica J Wanless
- Discipline of Chemistry, 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
| | - Vincent S J Craig
- Department of Materials Physics, Research School of Physics, Australian National University, Canberra, ACT 0200, Australia
| | - Gunther G Andersson
- Flinders Institute of Nanoscale Science and Technology, College of Science and Engineering, Flinders University, South Australia 5001, Australia
| | - Alister J Page
- Discipline of Chemistry, School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia.
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19
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Ninham B, Reines B, Battye M, Thomas P. Pulmonary surfactant and COVID-19: A new synthesis. QRB DISCOVERY 2022; 3:e6. [PMID: 37564950 PMCID: PMC10411325 DOI: 10.1017/qrd.2022.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 03/24/2022] [Accepted: 04/05/2022] [Indexed: 11/06/2022] Open
Abstract
Chapter 1 COVID-19 pathogenesis poses paradoxes difficult to explain with traditional physiology. For instance, since type II pneumocytes are considered the primary cellular target of SARS-CoV-2; as these produce pulmonary surfactant (PS), the possibility that insufficient PS plays a role in COVID-19 pathogenesis has been raised. However, the opposite of predicted high alveolar surface tension is found in many early COVID-19 patients: paradoxically normal lung volumes and high compliance occur, with profound hypoxemia. That 'COVID anomaly' was quickly rationalised by invoking traditional vascular mechanisms-mainly because of surprisingly preserved alveolar surface in early hypoxemic cases. However, that quick rejection of alveolar damage only occurred because the actual mechanism of gas exchange has long been presumed to be non-problematic, due to diffusion through the alveolar surface. On the contrary, we provide physical chemical evidence that gas exchange occurs by an process of expansion and contraction of the three-dimensional structures of PS and its associated proteins. This view explains anomalous observations from the level of cryo-TEM to whole individuals. It encompasses results from premature infants to the deepest diving seals. Once understood, the COVID anomaly dissolves and is straightforwardly explained as covert viral damage to the 3D structure of PS, with direct treatment implications. As a natural experiment, the SARS-CoV-2 virus itself has helped us to simplify and clarify not only the nature of dyspnea and its relationship to pulmonary compliance, but also the fine detail of the PS including such features as water channels which had heretofore been entirely unexpected. Chapter 2 For a long time, physical, colloid and surface chemistry have not intersected with physiology and cell biology as much as we might have hoped. The reasons are starting to become clear. The discipline of physical chemistry suffered from serious unrecognised omissions that rendered it ineffective. These foundational defects included omission of specific ion molecular forces and hydration effects. The discipline lacked a predictive theory of self-assembly of lipids and proteins. Worse, theory omitted any role for dissolved gases, O2, N2, CO2, and their existence as stable nanobubbles above physiological salt concentration. Recent developments have gone some way to explaining the foam-like lung surfactant structures and function. It delivers O2/N2 as nanobubbles, and efflux of CO2, and H2O nanobubbles at the alveolar surface. Knowledge of pulmonary surfactant structure allows an explanation of the mechanism of corona virus entry, and differences in infectivity of different variants. CO2 nanobubbles, resulting from metabolism passing through the molecular frit provided by the glycocalyx of venous tissue, forms the previously unexplained foam which is the endothelial surface layer. CO2 nanobubbles turn out to be lethal to viruses, providing a plausible explanation for the origin of 'Long COVID'. Circulating nanobubbles, stable above physiological 0.17 M salt drive various enzyme-like activities and chemical reactions. Awareness of the microstructure of Pulmonary Surfactant and that nanobubbles of (O2/N2) and CO2 are integral to respiratory and circulatory physiology provides new insights to the COVID-19 and other pathogen activity.
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Affiliation(s)
- Barry Ninham
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
- School of Science, University of New South Wales, Northcott Drive, Campbell, Canberra, ACT2612, Australia
| | - Brandon Reines
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
- Department of Biomedical Informatics, University of Pittsburgh School of Medicine, 5607 Baum Blvd, Pittsburgh, PA15206, USA
| | | | - Paul Thomas
- Materials Physics (formerly Department of Applied Mathematics), Research School of Physics, Australian National University, Canberra, ACT2600, Australia
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20
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Interaction of Aqueous Bovine Serum Albumin with Silica Aerogel Microparticles: Sorption Induced Aggregation. Int J Mol Sci 2022; 23:ijms23052816. [PMID: 35269957 PMCID: PMC8911040 DOI: 10.3390/ijms23052816] [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] [Received: 02/01/2022] [Revised: 02/23/2022] [Accepted: 02/26/2022] [Indexed: 01/27/2023] Open
Abstract
Mesoporous silica aerogels have a wide range of potential applications in biotechnology, the food industry, pharmacy and medicine. Understanding the nature of the interactions of biomolecules with these porous nanostructured materials is essential for achieving optimum performance in the targeted applications. In this study, the well-characterized bovine serum albumin (BSA) was chosen as a model protein to probe protein–aerogel interactions in the solution phase. Aqueous BSA was mixed with suspended silica aerogel microparticles, and the colloid system was monitored on-line by UV–vis spectrophotometry and turbidimetry. The global mathematical analysis of the time-resolved data reveals that the fast sorption of the protein on the aerogel microparticles follows a multistep binding mechanism. The extensive sorption of the protein eventually induces the aggregation of the covered aerogel due to the alteration of the electrical double layer of the particles. The interaction of BSA and silica aerogel is the strongest between pH = 4 and 5, because their native surface charges are the opposite in this pH range, as indicated by their respective zeta potentials.
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21
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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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22
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Parsons DF, Carucci C, Salis A. Buffer-specific effects arise from ionic dispersion forces. Phys Chem Chem Phys 2022; 24:6544-6551. [DOI: 10.1039/d2cp00223j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Buffer solutions do not simply regulate pH, but also change the properties of protein molecules. The zeta potential of lysozyme varies significantly at the same buffer concentration, in the order...
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23
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An indicator displacement assay-based optical chemosensor for heparin with a dual-readout and a reversible molecular logic gate operation based on the pyranine/methyl viologen. Biosens Bioelectron 2021; 194:113612. [PMID: 34507094 DOI: 10.1016/j.bios.2021.113612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 08/21/2021] [Accepted: 09/01/2021] [Indexed: 11/23/2022]
Abstract
We have reported an optical indicator displacement assay (IDA) for heparin with a UV-vis absorbance and fluorescence dual-readout based on pyranine/methyl viologen (MV2+). Upon introducing heparin, pyranine/MV2+ shows a clearly observable increase in UV-vis absorbance and a turn-on of the fluorescence signal. We have demonstrated that the ionic nature of buffers significantly affects the pyranine displacement and the zwitterionic HEPES was most suitable for heparin sensing. After careful screening of experimental conditions, the pyranine/MV2+-based optical chemosensor exhibits a fast, sensitive, and selective response toward heparin. It shows dynamic linear concentration of heparin in the ranges of 0.1-40 U·mL-1 and 0.01-20 U·mL-1 for the absorptive and fluorescent measurements, respectively, which both cover the clinically relevant levels of heparin. As with the animal experiments, the optical chemosensor has been demonstrated to be selective and effective for heparin level qualification in rat plasma. The chemosensor is readily accessible, cost-effective, and reliable, which holds a great promise for potential application on clinical and biological studies. Furthermore, this IDA system can serve as an IMPLICATION logic gate with a reversible and switchable logical manner.
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24
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Dong Y, Laaksonen A, Gao Q, Ji X. Molecular Mechanistic Insights into the Ionic-Strength-Controlled Interfacial Behavior of Proteins on a TiO 2 Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11499-11507. [PMID: 34549968 DOI: 10.1021/acs.langmuir.1c01726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
By adjusting the ionic strengths through changing the concentration of the buffer ions, the molecular force and the interfacial behavior of cytochrome c (Cyt c) and TiO2 are systematically studied. The molecular forces determined by combining the adhesion force and adsorption capacity are found to first increase and then decrease with the increasing ionic strength, with a peak obtained at an ionic strength between 0.8 and 1.0 M. The mechanism is explained based on the dissociation and hydration of ions at the interfaces, where the buffer ions could be completely dissociated at ionic strengths of <0.8 M but were partially associated when the ionic strength increased to a high value (>1.2 M), and the strongest hydration was observed around 1.0 M. The hydrodynamic size and the zeta potential value representing the effective contact area and protein stability of the Cyt c molecule, respectively, are also affected by the hydration and are proportional to the molecular forces. The interfacial behavior of Cyt c molecules on the TiO2 surface, determined through surface-enhanced Raman scattering (SERS), is extremely affected by the ionic strength of the solution as the ion dissociation and hydration also increase the electron transfer ability, where the best SERS enhancement is observed at the ionic strength of around 1.0 M, corresponding to the largest molecular force. Our results provide a detailed understanding at the nanoscale on controlling the protein interfacial behavior with solid surfaces, adjusted by the buffer ions.
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Affiliation(s)
- Yihui Dong
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot 76100, Israel
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
| | - Aatto Laaksonen
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Energy Engineering, Division of Energy Science, Luleå University of Technology, 97187 Luleå, Sweden
- Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
- Centre of Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, No. 41A, 700487 Iasi, Romania
| | - Qingwei Gao
- State Key Laboratory of Chemical Engineering and School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
| | - Xiaoyan Ji
- Energy Engineering, Division of Energy Science, Luleå University of Technology, 97187 Luleå, Sweden
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25
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Pavani P, Kumar K, Rani A, Venkatesu P, Lee MJ. The influence of sodium phosphate buffer on the stability of various proteins: Insights into protein-buffer interactions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115753] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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26
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Kravchenko O, Sutherland TC, Heyne B. Photobleaching of Erythrosine B in Aqueous Environment Investigation Beyond pH †. Photochem Photobiol 2021; 98:49-56. [PMID: 33565140 DOI: 10.1111/php.13396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 02/06/2021] [Indexed: 01/11/2023]
Abstract
In the scientific literature, the term aqueous environment is loosely employed as it encompasses a broad range of different buffering agents. While there is an increasing number of experimental evidence that point toward specific buffer effects extending far beyond pH, the impact of the chemical nature of the buffering ions is often disregarded, especially in photochemical studies. Herein, we highlighted the importance of buffer specific effects on both the photobleaching and the singlet oxygen quantum yields of a dye in aqueous environments. For this study, we chose erythrosine B (EB) as our model photosensitizer as its photochemistry and photobleaching are well documented in the literature. We followed EB's photobleaching via absorption spectroscopy in four different aqueous solvents, including pure water, phosphate, Tris and HEPES buffer. These buffer systems were selected because they are commonly used in biochemical and biological applications. Our results show that specific buffer effects cannot be neglected. Indeed, the singlet oxygen quantum yield for EB is significantly different in HEPES compared to the other solvents. Furthermore, we showed that EB's photoproduct is highly dependent on the nature of the chemical buffer being used.
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Affiliation(s)
- Olga Kravchenko
- Chemistry Department, University of Calgary, Calgary, AB, Canada
| | | | - Belinda Heyne
- Chemistry Department, University of Calgary, Calgary, AB, Canada
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Rakshit S, Ghosh S, Roy R, Bhattacharya SC. Non-enzymatic electrochemical glucose sensing by Cu2O octahedrons: elucidating the protein adsorption signature. NEW J CHEM 2021. [DOI: 10.1039/d0nj04431h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Developing an electrochemical biosensor based on Cu2O octahedrons for rapid, sensitive and highly selective detection of glucose in real samples with an unprecedented analysis of their protein adsorption signature.
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Affiliation(s)
| | - Srabanti Ghosh
- Department of Chemical, Biological and Macromolecular Sciences
- S. N. Bose National Centre for Basic Sciences
- Kolkata 700 098
- India
| | - Rimi Roy
- Department of Chemistry
- Presidency University
- Kolkata 700 073
- India
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Insight into interactions between enzyme and biological buffers: Enhanced thermal stability of stem bromelain. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114526] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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