1
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Peters J, Oliva R, Caliò A, Oger P, Winter R. Effects of Crowding and Cosolutes on Biomolecular Function at Extreme Environmental Conditions. Chem Rev 2023; 123:13441-13488. [PMID: 37943516 DOI: 10.1021/acs.chemrev.3c00432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
The extent of the effect of cellular crowding and cosolutes on the functioning of proteins and cells is manifold and includes the stabilization of the biomolecular systems, the excluded volume effect, and the modulation of molecular dynamics. Simultaneously, it is becoming increasingly clear how important it is to take the environment into account if we are to shed light on biological function under various external conditions. Many biosystems thrive under extreme conditions, including the deep sea and subseafloor crust, and can take advantage of some of the effects of crowding. These relationships have been studied in recent years using various biophysical techniques, including neutron and X-ray scattering, calorimetry, FTIR, UV-vis and fluorescence spectroscopies. Combining knowledge of the structure and conformational dynamics of biomolecules under extreme conditions, such as temperature, high hydrostatic pressure, and high salinity, we highlight the importance of considering all results in the context of the environment. Here we discuss crowding and cosolute effects on proteins, nucleic acids, membranes, and live cells and explain how it is possible to experimentally separate crowding-induced effects from other influences. Such findings will contribute to a better understanding of the homeoviscous adaptation of organisms and the limits of life in general.
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Affiliation(s)
- Judith Peters
- Univ. Grenoble Alpes, CNRS, LiPhy, 140 rue de la physique, 38400 St Martin d'Hères, France
- Institut Laue Langevin, 71 avenue des Martyrs, 38000 Grenoble, France
- Institut Universitaire de France, 75005 Paris, France
| | - Rosario Oliva
- Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, 80126 Naples, Italy
| | - Antonino Caliò
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Philippe Oger
- INSA Lyon, Universite Claude Bernard Lyon1, CNRS, UMR5240, 69621 Villeurbanne, France
| | - Roland Winter
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, Dortmund, Otto-Hahn-Str. 4a, D-44227 Dortmund, Germany
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2
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Wang T, Sun L, Mao X, Du X, Liu J, Chen L, Chen J. Bridging attraction of condensed bovine serum albumin solution in the presence of trivalent ions: A SANS study. Biochim Biophys Acta Gen Subj 2023; 1867:130487. [PMID: 37806463 DOI: 10.1016/j.bbagen.2023.130487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2023] [Revised: 09/20/2023] [Accepted: 10/05/2023] [Indexed: 10/10/2023]
Abstract
The bridging attraction of condensed bovine serum albumin (BSA) solution (D2O) in the presence of yttrium chloride (YCl3) was studied by small angle neutron scattering (SANS). With increasing the concentration of YCl3 (cY) from 3 to 15 mM and from 15 to 100 mM, the intensity in low-q region increases and then decreases. Combining the tri-axial ellipsoid (TaE) geometry and the multi-component sticky hard sphere (SHS) potential, a SHS-TaE model was established to quantitatively determine the size and distribution of particles. In this way, the structural mechanism of the aggregation-redissolution process in protein solution was demonstrated and discussed. As cY increases from 3 to 100 mM, the SHS radius rL decreases from ca. 2.97 to 2.50 nm, suggesting that the relatively well dispersed BSAs may form aggregates with various polydispersities. The axis a increases from 1.88 to 2.30 nm, while b and c decrease from 3.53 to 3.23 nm and from 4.12 to 3.55 nm, respectively. (RgTaE decreases from ca. 2.57 to 2.38 nm). Moreover, the scattering length density (SLD) of BSA decreases from 3.67 to 1.56 × 10-6 Å-2. All these results consistently indicate a strengthened attraction and the BSA molecules might shrink and tune out to be more like of oblate ellipsoid with increasing the amount of YCl3.
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Affiliation(s)
- Tingting Wang
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China.
| | - Liangwei Sun
- Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621999 Mianyang, China
| | - Xin Mao
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - Xiaobo Du
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China.
| | - Jihui Liu
- NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Mianyang 621000, China
| | - Liang Chen
- Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621999 Mianyang, China
| | - Jie Chen
- Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, 621999 Mianyang, China.
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3
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Lisina S, Inam W, Huhtala M, Howaili F, Zhang H, Rosenholm JM. Nano Differential Scanning Fluorimetry as a Rapid Stability Assessment Tool in the Nanoformulation of Proteins. Pharmaceutics 2023; 15:pharmaceutics15051473. [PMID: 37242715 DOI: 10.3390/pharmaceutics15051473] [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: 02/22/2023] [Revised: 04/20/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
The development and production of innovative protein-based therapeutics is a complex and challenging avenue. External conditions such as buffers, solvents, pH, salts, polymers, surfactants, and nanoparticles may affect the stability and integrity of proteins during formulation. In this study, poly (ethylene imine) (PEI) functionalized mesoporous silica nanoparticles (MSNs) were used as a carrier for the model protein bovine serum albumin (BSA). To protect the protein inside MSNs after loading, polymeric encapsulation with poly (sodium 4-styrenesulfonate) (NaPSS) was used to seal the pores. Nano differential scanning fluorimetry (NanoDSF) was used to assess protein thermal stability during the formulation process. The MSN-PEI carrier matrix or conditions used did not destabilize the protein during loading, but the coating polymer NaPSS was incompatible with the NanoDSF technique due to autofluorescence. Thus, another pH-responsive polymer, spermine-modified acetylated dextran (SpAcDEX), was applied as a second coating after NaPSS. It possessed low autofluorescence and was successfully evaluated with the NanoDSF method. Circular dichroism (CD) spectroscopy was used to determine protein integrity in the case of interfering polymers such as NaPSS. Despite this limitation, NanoDSF was found to be a feasible and rapid tool to monitor protein stability during all steps needed to create a viable nanocarrier system for protein delivery.
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Affiliation(s)
- Sofia Lisina
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Wali Inam
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Mikko Huhtala
- Structural Bioinformatics Laboratory, Faculty of Science and Engineering, Biochemistry, Åbo Akademi University, 20500 Turku, Finland
| | - Fadak Howaili
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Hongbo Zhang
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
| | - Jessica M Rosenholm
- Pharmaceutical Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, 20500 Turku, Finland
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4
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Begam N, Timmermann S, Ragulskaya A, Girelli A, Senft MD, Retzbach S, Anthuparambil ND, Akhundzadeh MS, Kowalski M, Reiser M, Westermeier F, Sprung M, Zhang F, Gutt C, Schreiber F. Effects of temperature and ionic strength on the microscopic structure and dynamics of egg white gels. J Chem Phys 2023; 158:074903. [PMID: 36813727 DOI: 10.1063/5.0130758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
We investigate the thermal gelation of egg white proteins at different temperatures with varying salt concentrations using x-ray photon correlation spectroscopy in the geometry of ultra-small angle x-ray scattering. Temperature-dependent structural investigation suggests a faster network formation with increasing temperature, and the gel adopts a more compact network, which is inconsistent with the conventional understanding of thermal aggregation. The resulting gel network shows a fractal dimension δ, ranging from 1.5 to 2.2. The values of δ display a non-monotonic behavior with increasing amount of salt. The corresponding dynamics in the q range of 0.002-0.1 nm-1 is observable after major change of the gel structure. The extracted relaxation time exhibits a two-step power law growth in dynamics as a function of waiting time. In the first regime, the dynamics is associated with structural growth, whereas the second regime is associated with the aging of the gel, which is directly linked with its compactness, as quantified by the fractal dimension. The gel dynamics is characterized by a compressed exponential relaxation with a ballistic-type of motion. The addition of salt gradually makes the early stage dynamics faster. Both gelation kinetics and microscopic dynamics show that the activation energy barrier in the system systematically decreases with increasing salt concentration.
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Affiliation(s)
- Nafisa Begam
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | | | | | - Anita Girelli
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Maximilian D Senft
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Sebastian Retzbach
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | | | | | - Marvin Kowalski
- Department Physik, Universität Siegen, 57072 Siegen, Germany
| | - Mario Reiser
- Department of Physics, AlbaNova University Center, Stockholm University, S-106 91 Stockholm, Sweden
| | - Fabian Westermeier
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Michael Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
| | - Christian Gutt
- Department Physik, Universität Siegen, 57072 Siegen, Germany
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, 72076 Tübingen, Germany
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5
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Di Bari D, Timr S, Guiral M, Giudici-Orticoni MT, Seydel T, Beck C, Petrillo C, Derreumaux P, Melchionna S, Sterpone F, Peters J, Paciaroni A. Diffusive Dynamics of Bacterial Proteome as a Proxy of Cell Death. ACS CENTRAL SCIENCE 2023; 9:93-102. [PMID: 36712493 PMCID: PMC9881203 DOI: 10.1021/acscentsci.2c01078] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Indexed: 05/30/2023]
Abstract
Temperature variations have a big impact on bacterial metabolism and death, yet an exhaustive molecular picture of these processes is still missing. For instance, whether thermal death is determined by the deterioration of the whole or a specific part of the proteome is hotly debated. Here, by monitoring the proteome dynamics of E. coli, we clearly show that only a minor fraction of the proteome unfolds at the cell death. First, we prove that the dynamical state of the E. coli proteome is an excellent proxy for temperature-dependent bacterial metabolism and death. The proteome diffusive dynamics peaks at about the bacterial optimal growth temperature, then a dramatic dynamical slowdown is observed that starts just below the cell's death temperature. Next, we show that this slowdown is caused by the unfolding of just a small fraction of proteins that establish an entangling interprotein network, dominated by hydrophobic interactions, across the cytoplasm. Finally, the deduced progress of the proteome unfolding and its diffusive dynamics are both key to correctly reproduce the E. coli growth rate.
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Affiliation(s)
- Daniele Di Bari
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
- Université
Grenoble Alpes, CNRS, Laboratoire Interdisciplinaire de Physique, 38400Saint-Martin-d’Héres, France
- Institut
Laue-Langevin, 38000Grenoble, France
| | - Stepan Timr
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
- J.
Heyrovský
Institute of Physical Chemistry, Czech Academy
of Sciences, 182 23Prague 8, Czechia
| | - Marianne Guiral
- Laboratoire
de Bioénergétique et Ingénierie des Protéines, BIP, CNRS, Aix-Marseille Université, 13400Marseille, France
| | | | - Tilo Seydel
- Institut
Laue-Langevin, 38000Grenoble, France
| | | | - Caterina Petrillo
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
| | - Philippe Derreumaux
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut Universitaire de France, 75005Paris, France
| | - Simone Melchionna
- ISC-CNR,
Dipartimento di Fisica, Università
Sapienza, 00185Rome, Italy
- Lexma
Technology1337 Massachusetts
Avenue, Arlington, Massachusetts02476, United States
| | - Fabio Sterpone
- Laboratoire
de Biochimie Théorique (UPR9080), CNRS, Université de Paris Cité, 13 Rue Pierre et Marie Curie, 75005Paris, France
- Institut
de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005Paris, France
| | - Judith Peters
- Université
Grenoble Alpes, CNRS, Laboratoire Interdisciplinaire de Physique, 38400Saint-Martin-d’Héres, France
- Institut
Laue-Langevin, 38000Grenoble, France
- Institut Universitaire de France, 75005Paris, France
| | - Alessandro Paciaroni
- Università
degli Studi di Perugia, Dipartimento di
Fisica e Geologia, Via
A. Pascoli, 06123Perugia PG, Italy
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6
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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: 0] [Impact Index Per Article: 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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7
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Gong Y, Bi X, Chen N, Forconi M, Kuthirummal N, Teklu A, Gao B, Koenemann J, Harris N, Brennan C, Thomas M, Barnes T, Hu M. Significant Enhancement of Two-Photon Excited Fluorescence in Water-Soluble Triphenylamine-Based All-Organic Compounds. J Phys Chem B 2022; 126:5513-5522. [PMID: 35830467 DOI: 10.1021/acs.jpcb.2c03514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding water-soluble and environmentally friendly two-photon absorption (TPA) molecules benefits the design of superior organic complexes for biomedical, illumination, and display applications. In this work, we designed two triphenylamine-based all-organic compounds and explored the mechanism of enhanced TP fluorescence in water solutions for potential applications. Experimentally, we showed that adding protein into our TPA molecule solution can drastically boost the TP fluorescence. Numerical simulations reveal that the TPA molecules prefer to dock inside the protein complex. We hypothesize that the interaction between our triphenylamine-based all-organic compounds and water molecules lead to non-radiative decay processes, which prevent strong TP fluorescence in the water solution. Therefore, the protection by, for example, protein molecules from such interactions can be a universal strategy for superior functioning of organic TPA molecules. Further experiments and numerical simulations support our hypothesis. The present study may facilitate the design of superior water-soluble and environmentally friendly superior organic complexes.
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Affiliation(s)
- Yu Gong
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Xiangdong Bi
- Department of Physical Sciences, Charleston Southern University, 9200 University Blvd, Charlest on, South Carolina 29485, United States
| | - Nikki Chen
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - Marcello Forconi
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - Narayanan Kuthirummal
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Alem Teklu
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Bo Gao
- Department of Physics and Astronomy, Hunter College, City University of New York, New York, New York 10065, United States
| | - Jacob Koenemann
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Nico Harris
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Christian Brennan
- Department of Physics and Astronomy, College of Charleston, 58 Coming Street, Charleston, South Carolina 29424, United States
| | - Marisa Thomas
- Department of Physical Sciences, Charleston Southern University, 9200 University Blvd, Charlest on, South Carolina 29485, United States
| | - Taylor Barnes
- Department of Physical Sciences, Charleston Southern University, 9200 University Blvd, Charlest on, South Carolina 29485, United States
| | - Ming Hu
- Department of Mechanical Engineering, University of South Carolina, 541 Main Street, Columbia, South Carolina 29208, United States
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8
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Bercea M. Self-Healing Behavior of Polymer/Protein Hybrid Hydrogels. Polymers (Basel) 2021; 14:130. [PMID: 35012155 PMCID: PMC8747654 DOI: 10.3390/polym14010130] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/20/2021] [Accepted: 12/27/2021] [Indexed: 12/17/2022] Open
Abstract
The paper presents the viscoelastic properties of new hybrid hydrogels containing poly(vinyl alcohol) (PVA), hydroxypropylcellulose (HPC), bovine serum albumin (BSA) and reduced glutathione (GSH). After heating the mixture at 55 °C, in the presence of GSH, a weak network is formed due to partial BSA unfolding. By applying three successive freezing/thawing cycles, a stable porous network structure with elastic properties is designed, as evidenced by SEM and rheology. The hydrogels exhibit self-healing properties when the samples are cut into two pieces; the intermolecular interactions are reestablished in time and therefore the fragments repair themselves. The effects of the BSA content, loaded deformation and temperature on the self-healing ability of hydrogels are presented and discussed through rheological data. Due to their versatile viscoelastic behavior, the properties of PVA/HPC/BSA hydrogels can be tuned during their preparation in order to achieve suitable biomaterials for targeted applications.
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Affiliation(s)
- Maria Bercea
- "Petru Poni" Institute of Macromolecular Chemistry, 41-A Grigore Ghica Voda Alley, 700487 Iasi, Romania
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9
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Walia S, Bhatnagar I, Liu J, Mitra SK, Asthana A. A novel method for fabrication of paper-based microfluidic devices using BSA-ink. Int J Biol Macromol 2021; 193:1617-1622. [PMID: 34774599 DOI: 10.1016/j.ijbiomac.2021.10.224] [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: 07/16/2021] [Revised: 09/28/2021] [Accepted: 10/30/2021] [Indexed: 10/19/2022]
Abstract
This paper describes the fabrication of paper-based microfluidic devices using a novel, inexpensive ink composed of bovine serum albumin (BSA), utilizing BSA's thermal denaturation and aggregation to create a hydrophobic barrier on Whatman® Grade 4 filter paper. A 20% aqueous solution of BSA was inked onto the paper using a pen plotter at moderate speed (5 cm/s) with desired shape and size followed by heating at 80 °C to denature the BSA leading to hydrophobic barriers formation, whereas below 80 °C the barrier layer is prone to collapse. The minimum line gap and line width of ~1 mm and ~1.3 mm were achieved. Finally, a proof-of-concept glucose sensing was shown while addressing the issue of the coffee ring effect using the biopolymer NanoCheck-ATH® from ChitoLytic Inc. The glucose concentration limit of detection (LOD) as low as 0.2 mg/mL was estimated. The developed technique offers ease of fabrication, high reproducibility, cost-effectiveness, and is environmentally friendly.
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Affiliation(s)
- Sunil Walia
- Micro & Nano-scale Transport Laboratory, Waterloo Institute for Nanotechnology, Department of Mechanical & Mechatronics Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Ira Bhatnagar
- CSIR-Centre for Cellular & Molecular Biology, Habsiguda, Uppal Road, Hyderabad 500 007, Telangana, India
| | - Juewen Liu
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Sushanta K Mitra
- Micro & Nano-scale Transport Laboratory, Waterloo Institute for Nanotechnology, Department of Mechanical & Mechatronics Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
| | - Amit Asthana
- Department of Medical Devices, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500039, India; CSIR-Centre for Cellular & Molecular Biology, Habsiguda, Uppal Road, Hyderabad 500 007, Telangana, India.
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10
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Kumar S, Saha D, Ray D, Abbas S, Aswal VK. Unusual stability of protein molecules in the presence of multivalent counterions. Phys Rev E 2021; 104:L012603. [PMID: 34412269 DOI: 10.1103/physreve.104.l012603] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 07/08/2021] [Indexed: 12/29/2022]
Abstract
Proteins are known to undergo denaturation and form different phases with varying physicochemical parameters. We report unusual stability of bovine serum albumin protein against commonly used denaturants (temperature and surfactant) in the charged reversal reentrant phase, caused by the multivalent counterions. Unlike monovalent counterions, which promote the denaturants' induced protein unfolding, the unfolding is restricted in the presence of multivalent ions. The observations are beyond the scope of general understanding of protein unfolding and are believed to be governed by ion-ion correlations driven strong condensation of the multivalent ions.
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Affiliation(s)
- Sugam Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Debasish Saha
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sohrab Abbas
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.,Homi Bhabha National Institute, Mumbai 400 094, India
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