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Kuroiwa I, Maki Y, Matsuo K, Annaka M. Protein Preferential Solvation in (Sucralose + Water) Mixtures. J Phys Chem B 2024; 128:676-683. [PMID: 38197901 DOI: 10.1021/acs.jpcb.3c06317] [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: 01/11/2024]
Abstract
Addition of sugars such as sucrose to aqueous protein solutions generally stabilizes proteins against thermal denaturation by preferential exclusion of sugars from proteins (preferential hydration of proteins). In this study, we investigated the effect of sucralose, a chlorinated sucrose derivative, on protein stability and preferential solvation. Circular dichroism and small-angle X-ray scattering measurements showed that sucrose increased the denaturation temperature of myoglobin and was preferentially excluded from the protein, whereas sucralose decreased the denaturation temperature of myoglobin and was preferentially adsorbed to the protein. No clear evidence was obtained for the indirect effects of sucralose on protein destabilization via the structure and properties of solvent water from the physicochemical properties (mass density, sound velocity, viscosity, and osmolality) of aqueous sucralose solutions; therefore, we concluded that a direct protein-sucralose interaction induced protein destabilization.
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Affiliation(s)
- Isamu Kuroiwa
- Graduate School of Science, Kyushu University, Fukuoka 819-0395, Japan
| | - Yasuyuki Maki
- Faculty of Science, Kyusyu University, Fukuoka 819-0395, Japan
| | - Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Hiroshima, Japan
| | - Masahiko Annaka
- Faculty of Science, Kyusyu University, Fukuoka 819-0395, Japan
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2
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Sun H, Yao C, You K, Chen C, Liu S, Xu Z. Nanopore single-molecule biosensor in protein denaturation analysis. Anal Chim Acta 2023; 1243:340830. [PMID: 36697181 DOI: 10.1016/j.aca.2023.340830] [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: 11/10/2022] [Revised: 01/02/2023] [Accepted: 01/11/2023] [Indexed: 01/13/2023]
Abstract
Unclear issues in protein studies include but not limited to the stability and denaturation mechanism in the presence of denaturants. Herein, we report a dynamic monitoring approach based on nanopore single-molecule biosensor, which can detect the protein's folding and unfolding transitions by recording a nanopore ionic current. When gradually increasing the concentration of denaturant guanidine hydrochloride (GdmCl), sensitive responses were observed with lysozyme unfolding. The emergence of the featured biphasic-pulse demonstrated the existence of a stable intermediate. It was the first time to experimentally confirm the dynamic equilibrium between the intermediate and the native states at single molecule level, therefore consolidating the standpoint of lysozyme denaturation process following the three-state model. Additionally, we got more insights into the conformation about the intermediate as globular-like structure, larger gyration radius, and enhanced positive charge density. We considered that the manner of denaturant toward lysozyme adopts the "direct" model based on stronger electrostatic and van der Waals forces. Nanopore biosensor exhibited excellent sensitivity with a low detection concentration of 280 pM and reproducibility in analysing the folding intermediate of lysozyme.
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Affiliation(s)
- Hong Sun
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China.
| | - Chuan Yao
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China
| | - Kaibo You
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China
| | - Can Chen
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China
| | - Shuoshuo Liu
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China
| | - Zhihong Xu
- Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, Henan, 461000, PR China
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3
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Effects of Molecular Crowding and Betaine on HSPB5 Interactions, with Target Proteins Differing in the Quaternary Structure and Aggregation Mechanism. Int J Mol Sci 2022; 23:ijms232315392. [PMID: 36499725 PMCID: PMC9737104 DOI: 10.3390/ijms232315392] [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: 11/17/2022] [Revised: 12/01/2022] [Accepted: 12/02/2022] [Indexed: 12/13/2022] Open
Abstract
The aggregation of intracellular proteins may be enhanced under stress. The expression of heat-shock proteins (HSPs) and the accumulation of osmolytes are among the cellular protective mechanisms in these conditions. In addition, one should remember that the cell environment is highly crowded. The antiaggregation activity of HSPB5 and the effect on it of either a crowding agent (polyethylene glycol (PEG)) or an osmolyte (betaine), or their mixture, were tested on the aggregation of two target proteins that differ in the order of aggregation with respect to the protein: thermal aggregation of glutamate dehydrogenase and DTT-induced aggregation of lysozyme. The kinetic analysis of the dynamic light-scattering data indicates that crowding can decrease the chaperone-like activity of HSPB5. Nonetheless, the analytical ultracentrifugation shows the protective effect of HSPB5, which retains protein aggregates in a soluble state. Overall, various additives may either improve or impair the antiaggregation activity of HSPB5 against different protein targets. The mixed crowding arising from the presence of PEG and 1 M betaine demonstrates an extraordinary effect on the oligomeric state of protein aggregates. The shift in the equilibrium of HSPB5 dynamic ensembles allows for the regulation of its antiaggregation activity. Crowding can modulate HSPB5 activity by affecting protein-protein interactions.
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Refolding of Lysozyme in Glycerol as Studied by Fast Scanning Calorimetry. Int J Mol Sci 2022; 23:ijms23052773. [PMID: 35269914 PMCID: PMC8911483 DOI: 10.3390/ijms23052773] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 02/22/2022] [Accepted: 02/26/2022] [Indexed: 02/01/2023] Open
Abstract
The folding of lysozyme in glycerol was monitored by the fast scanning calorimetry technique. Application of a temperature–time profile with an isothermal segment for refolding allowed assessment of the state of the non-equilibrium protein ensemble and gave information on the kinetics of folding. We found that the non-equilibrium protein ensemble mainly contains a mixture of unfolded and folded protein forms and partially folded intermediates, and enthalpic barriers control the kinetics of the process. Lysozyme folding in glycerol follows the same or similar triangular mechanism described in the literature for folding in water. The unfolding enthalpy of the intermediate must be no lower than 70% of the folded form, while the activation barrier for the unfolding of the intermediate (ca. 140 kJ/mol) is about 100 kJ/mol lower than that of the folded form (ca. 240–260 kJ/mol).
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5
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Trehalose Effect on the Aggregation of Model Proteins into Amyloid Fibrils. Life (Basel) 2020; 10:life10050060. [PMID: 32414105 PMCID: PMC7281244 DOI: 10.3390/life10050060] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/07/2020] [Accepted: 05/08/2020] [Indexed: 12/13/2022] Open
Abstract
Protein aggregation into amyloid fibrils is a phenomenon that attracts attention from a wide and composite part of the scientific community. Indeed, the presence of mature fibrils is associated with several neurodegenerative diseases, and in addition these supramolecular aggregates are considered promising self-assembling nanomaterials. In this framework, investigation on the effect of cosolutes on protein propensity to aggregate into fibrils is receiving growing interest, and new insights on this aspect might represent valuable steps towards comprehension of highly complex biological processes. In this work we studied the influence exerted by the osmolyte trehalose on fibrillation of two model proteins, that is, lysozyme and insulin, investigated during concomitant variation of the solution ionic strength due to NaCl. In order to monitor both secondary structures and the overall tridimensional conformations, we have performed UV spectroscopy measurements with Congo Red, Circular Dichroism, and synchrotron Small Angle X-ray Scattering. For both proteins we describe the effect of trehalose in changing the fibrillation pattern and, as main result, we observe that ionic strength in solution is a key factor in determining trehalose efficiency in slowing down or blocking protein fibrillation. Ionic strength reveals to be a competitive element with respect to trehalose, being able to counteract its inhibiting effects toward amyloidogenesis. Reported data highlight the importance of combining studies carried out on cosolutes with valuation of other physiological parameters that may affect the aggregation process. Also, the obtained experimental results allow to hypothesize a plausible mechanism adopted by the osmolyte to preserve protein surface and prevent protein fibrillation.
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Chéron N, Naepels M, Pluhařová E, Laage D. Protein Preferential Solvation in Water:Glycerol Mixtures. J Phys Chem B 2020; 124:1424-1437. [PMID: 31999925 DOI: 10.1021/acs.jpcb.9b11190] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
For proteins in solvent mixtures, the relative abundances of each solvent in their solvation shell have a critical impact on their properties. Preferential solvation of a series of proteins in water-glycerol mixtures is studied here over a broad range of solvent compositions via classical molecular dynamics simulations. Our simulation results reveal that the differences between shell and bulk compositions exhibit dramatic changes with solvent composition, temperature, and protein nature. In contrast with the simple and widely used picture where glycerol is completely excluded from the protein interface, we show that for aqueous solutions with less than 50% glycerol in volume, protein solvation shells have approximately the same composition as the bulk solvent and proteins are in direct contact with glycerol. We further demonstrate that at high glycerol concentration, glycerol depletion from the solvation shell is due to an entropic factor arising from the reduced accessibility of bulky glycerol molecules in protein cavities. The resulting molecular picture is important to understand protein activity and cryopreservation in mixed aqueous solvents.
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Affiliation(s)
- Nicolas Chéron
- PASTEUR, Département de chimie , École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Margaux Naepels
- PASTEUR, Département de chimie , École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Eva Pluhařová
- PASTEUR, Département de chimie , École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
| | - Damien Laage
- PASTEUR, Département de chimie , École Normale Supérieure, PSL University, Sorbonne Université, CNRS , 75005 Paris , France
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7
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The Effect of Dimethyl Sulfoxide on the Lysozyme Unfolding Kinetics, Thermodynamics, and Mechanism. Biomolecules 2019; 9:biom9100547. [PMID: 31569484 PMCID: PMC6843525 DOI: 10.3390/biom9100547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 09/26/2019] [Accepted: 09/27/2019] [Indexed: 02/07/2023] Open
Abstract
The thermal stability of proteins in the presence of organic solvents and the search for ways to increase this stability are important topics in industrial biocatalysis and protein engineering. The denaturation of hen egg-white lysozyme in mixtures of water with dimethyl sulfoxide (DMSO) with a broad range of compositions was studied using a combination of differential scanning calorimetry (DSC), circular dichroism (CD), and spectrofluorimetry techniques. In this study, for the first time, the kinetics of unfolding of lysozyme in DMSO–water mixtures was characterized. In the presence of DMSO, a sharp decrease in near-UV CD and an increase in the fluorescence signal were observed at lower temperatures than the DSC denaturation peak. It was found that differences in the temperatures of the CD and DSC signal changes increase as the content of DMSO increases. Changes in CD and fluorescence are triggered by a break of the tertiary contacts, leading to an intermediate state, while the DSC peak corresponds to a subsequent complete loss of the native structure. In this way, the commonly used two-state model was proven to be unsuitable to describe the unfolding of lysozyme in the presence of DMSO. In kinetic studies, it was found that even high concentrations of DMSO do not drastically change the activation energy of the initial stage of unfolding associated with a disruption of the tertiary structure, while the enthalpy of denaturation shows a significant dependence on DMSO content. This observation suggests that the structure of the transition state upon unfolding remains similar to the structure of the native state.
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8
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Mukhametzyanov TA, Sedov IA, Solomonov BN, Schick C. Fast scanning calorimetry of lysozyme unfolding at scanning rates from 5 K/min to 500,000 K/min. Biochim Biophys Acta Gen Subj 2018; 1862:2024-2030. [PMID: 29964144 DOI: 10.1016/j.bbagen.2018.06.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 06/22/2018] [Accepted: 06/26/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Protein denaturation is often studied using differential scanning calorimetry (DSC). However, conventional instruments are limited in the temperature scanning rate available. Fast scanning calorimetry (FSC) provides an ability to study processes at much higher rates while using extremely small sample masses [ng]. This makes it a very interesting technique for protein investigation. METHODS A combination of conventional DSC and fast scanning calorimeters was used to study denaturation of lysozyme dissolved in glycerol. Glycerol was chosen as a solvent to prevent evaporation from the micro-sized samples of the fast scanning calorimeter. RESULTS The lysozyme denaturation temperatures in the range of scanning rates from 5 K/min to ca. 500,000 K/min follow the Arrhenius law. The experimental results for FSC and conventional DSC fall into two distinct clusters in a Kissinger plot, which are well approximated by two parallel straight lines. CONCLUSIONS The transition temperatures for the unfolding process measured on fast scanning calorimetry sensor are significantly lower than what could be expected from the results of conventional DSC using extrapolation to high scanning rates. Evidence for the influence of the relative surface area on the unfolding temperature was found. GENERAL SIGNIFICANCE For the first time, fast scanning calorimetry was employed to study protein denaturation with a range of temperature scanning rates of 5 orders of magnitude. Decreased thermal stability of the micro-sized samples on the fast scanning calorimeter raise caution over using bulk solution thermal stability data of proteins for applications where micro-sized dispersed protein solutions are used, e.g., spray drying.
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Affiliation(s)
| | - Igor A Sedov
- Kazan Federal University, 18 Kremlyovskaya Street, Kazan 420008, Russian Federation
| | - Boris N Solomonov
- Kazan Federal University, 18 Kremlyovskaya Street, Kazan 420008, Russian Federation
| | - Christoph Schick
- Kazan Federal University, 18 Kremlyovskaya Street, Kazan 420008, Russian Federation; University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, 18051 Rostock, Germany
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9
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Electrochemical signature of hen egg white lysozyme at the glycerol-modified liquid-liquid interface. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.10.098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Gupta S, Chakraborty A, Sen P. Elucidation of intriguing methanol-dichloromethane binary solvent mixture: Synergistic effect, analytical modeling, NMR and photo-induced electron transfer studies. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.08.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Xing L, Lin K, Zhou X, Liu S, Luo Y. Multistate Mechanism of Lysozyme Denaturation through Synchronous Analysis of Raman Spectra. J Phys Chem B 2016; 120:10660-10667. [DOI: 10.1021/acs.jpcb.6b07900] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Ke Lin
- School
of Physics and Optoelectronic Engineering, Xidian University, Xi’an, Shanxi 710071, China
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12
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Spinozzi F, Mariani P, Ortore MG. Proteins in binary solvents. Biophys Rev 2016; 8:87-106. [PMID: 28510051 PMCID: PMC5425779 DOI: 10.1007/s12551-016-0193-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 02/01/2016] [Indexed: 01/09/2023] Open
Abstract
Proteins in living organisms exist in complex aqueous solutions or embedded in membranes. In solution, proteins are surrounded by a tightly bound hydration layer, which is more ordered and less mobile than bulk water. As a consequence, water plays a major role in controlling protein structure stability, conformational flexibility, dynamics, and functionality, but it also appears that protein surface regulates the structuring of the surrounding water. The presence of cosolvents can modify the hydration layer characteristics and then the whole protein structural and dynamical properties. Because cytoplasm or biological liquids are complex solutions, the knowledge of the solvation shell characteristics in mixed solvents should be considered as a crucial step in describing biological processes at molecular level. This review reports on recent studies on the structural and thermodynamic properties of model proteins dissolved in binary solvent mixtures by small-angle neutron scattering (SANS) and differential scanning microcalorimetry (DSC) techniques. We will show that contrast variation SANS experiments allow to acquire a direct knowledge of both protein structure and protein solvation shell (in terms of low-resolution shape and solvent/cosolvent composition), while DSC experiments provide information on all the relevant thermodynamic properties. We will focus on two main points. First, an extended description of the thermodynamic model used to define the equilibria between water and cosolvent molecules in the protein solvation shell will be presented. Second, the determination of the peculiar characteristics of the protein solvation layer, which will be illustrated by considering different systems. As a conclusion, we will show that the investigation of structure and thermodynamics of proteins in binary aqueous mixtures is an important way to understand the role of hydration in protein stability and activity.
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Affiliation(s)
- Francesco Spinozzi
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy.
| | - Paolo Mariani
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
| | - Maria Grazia Ortore
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Ancona, Italy
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13
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King JT, Kubarych KJ. Site-specific coupling of hydration water and protein flexibility studied in solution with ultrafast 2D-IR spectroscopy. J Am Chem Soc 2012; 134:18705-12. [PMID: 23101613 DOI: 10.1021/ja307401r] [Citation(s) in RCA: 133] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
There is considerable evidence for the slaving of biomolecular dynamics to the motions of the surrounding solvent environment, but to date there have been few direct experimental measurements capable of site-selectively probing both the dynamics of the water and the protein with ultrafast time resolution. Here, two-dimensional infrared spectroscopy (2D-IR) is used to study the ultrafast hydration and protein dynamics sensed by a metal carbonyl vibrational probe covalently attached to the surface of hen egg white lysozyme dissolved in D(2)O/glycerol solutions. Surface labeling provides direct access to the dynamics at the protein-water interface, where both the hydration and the protein dynamics can be observed simultaneously through the vibrational probe's frequency-frequency correlation function. In pure D(2)O, the correlation function shows a fast initial 3 ps decay corresponding to fluctuations of the hydration water, followed by a significant static offset attributed to fluctuations of the protein that are not sampled within the <20 ps experimental window. Adding glycerol increases the bulk solvent viscosity while leaving the protein structurally intact and hydrated. The hydration dynamics exhibit a greater than 3-fold slowdown between 0 and 80% glycerol (v/v), and the contribution from the protein's dynamics is found to slow in a nearly identical fashion. In addition, the magnitude of the dynamic slowdown associated with hydrophobic hydration is directly measured and shows quantitative agreement with predictions from molecular dynamics simulations.
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Affiliation(s)
- John T King
- Department of Chemistry, University of Michigan, Ann Arbor, 48109, United States
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14
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Park J, Yun J, Lim JA, Kang DH, Ryu S. Characterization of an endolysin, LysBPS13, from a Bacillus cereus bacteriophage. FEMS Microbiol Lett 2012; 332:76-83. [PMID: 22524239 DOI: 10.1111/j.1574-6968.2012.02578.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 03/06/2012] [Accepted: 04/18/2012] [Indexed: 11/28/2022] Open
Abstract
Use of bacteriophages as biocontrol agents is a promising tool for controlling pathogenic bacteria including antibiotic-resistant bacteria. Not only bacteriophages but also endolysins, the peptidoglycan hydrolyzing enzymes encoded by bacteriophages, have high potential for applications as biocontrol agents against food-borne pathogens. In this study, a putative endolysin gene was identified in the genome of the bacteriophage BPS13, which infects Bacillus cereus. In silico analysis of this endolysin, designated LysBPS13, showed that it consists of an N-terminal catalytic domain (PGRP domain) and a C-terminal cell wall binding domain (SH3_5 domain). Further characterization of the purified LysBPS13 revealed that this endolysin is an N-acetylmuramyl-l-alanine amidase, the activity of which was not influenced by addition of EDTA. In addition, LysBPS13 demonstrated remarkable thermostability in the presence of glycerol, and it retained its lytic activity even after incubation at 100 °C for 30 min. Taken together, these results indicate that LysBPS13 can be considered a favorable candidate for a new antimicrobial agent to control B. cereus.
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Affiliation(s)
- Jaeeun Park
- Department of Food and Animal Biotechnology, Center for Agricultural Biomaterials Seoul National University, Seoul, South Korea
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15
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Ortore MG, Mariani P, Carsughi F, Cinelli S, Onori G, Teixeira J, Spinozzi F. Preferential solvation of lysozyme in water/ethanol mixtures. J Chem Phys 2011; 135:245103. [DOI: 10.1063/1.3670419] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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16
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Pierre B, Xiong T, Hayles L, Guntaka VR, Kim JR. Stability of a guest protein depends on stability of a host protein in insertional fusion. Biotechnol Bioeng 2011; 108:1011-20. [DOI: 10.1002/bit.23039] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Revised: 11/03/2010] [Accepted: 12/06/2010] [Indexed: 11/11/2022]
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17
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Esposito A, Comez L, Cinelli S, Scarponi F, Onori G. Influence of glycerol on the structure and thermal stability of lysozyme: a dynamic light scattering and circular dichroism study. J Phys Chem B 2010; 113:16420-4. [PMID: 19924849 DOI: 10.1021/jp906739v] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Photon correlation spectroscopy and circular dichroism have been used to study the role of hydration in the structure and thermostability of the model protein lysozyme in water-glycerol mixtures. Two cases have been considered: water-rich and glycerol-rich regimes of concentrations. We follow the thermal denaturation both by optical spectral changes and hydrodynamic radius variations. This methodology allows us to emphasize the relevant role played by hydrophobic interactions during the process in aqueous solutions and, in glycerol, to distinguish the non-cooperative melting of secondary structure, supporting the view of a protein transition to a molten globule-like state.
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Affiliation(s)
- Alessandro Esposito
- Dipartimento di Fisica, Università di Perugia, Via Pascoli, I-06123 Perugia, Italy
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18
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Vagenende V, Yap MGS, Trout BL. Mechanisms of Protein Stabilization and Prevention of Protein Aggregation by Glycerol. Biochemistry 2009; 48:11084-96. [DOI: 10.1021/bi900649t] [Citation(s) in RCA: 310] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Vincent Vagenende
- Singapore-MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576
- Bioprocessing Technology Institute, 20 Biopolis Way #06-01, Centros, Singapore 138668
| | - Miranda G. S. Yap
- Singapore-MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576
- Bioprocessing Technology Institute, 20 Biopolis Way #06-01, Centros, Singapore 138668
| | - Bernhardt L. Trout
- Singapore-MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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19
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Vrikkis RM, Fraser KJ, Fujita K, Macfarlane DR, Elliott GD. Biocompatible ionic liquids: a new approach for stabilizing proteins in liquid formulation. J Biomech Eng 2009; 131:074514. [PMID: 19640150 DOI: 10.1115/1.3156810] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Ionic liquids (ILs) have shown excellent promise as both solutes and solvents for stabilizing proteins at room temperature. Because many modern drugs are protein-based, these stabilizing characteristics have great potential to provide advances in the field of liquid formulation of therapeutic proteins. However, before these developments can be translated into clinical solutions it is essential to establish data related to the biocompatibility of these ILs. The current work investigates the cytotoxicity of several ILs that were rationally synthesized from natural biomolecules and compounds that have already been approved as excipients for drug formulations. The effect of choline dihydrogen phosphate (choline dhp), choline saccharinate, and 1-butyl 3-methyl imidazolium lactate (bmim lactate) on the metabolic activity of a mouse macrophage cell line (J774) was assessed using the reduction in resazurin as an indicator of activity and, by extension, viability. Two formulations of lysozyme (10 mg/ml and 100 mg/ml) in 80 wt % choline dhp (aq) were prepared and the proteins were evaluated for structural stability immediately following formulation and again at 1 month. Equivalent formulations in 0.1 M Na acetate aqueous buffer were evaluated as controls. A differential scanning microcalorimeter (DSC) was used to evaluate the structural stability on the basis of the unfolding temperature and the enthalpy of unfolding, and a micrococcus lysodiekticus activity test was used to evaluate functional activity. All compounds were found to be relatively benign, with toxicity increasing in the order choline dhp<choline saccharinate<bmim lactate. At 1 month lysozyme that had been stored in choline dhp had a higher activity and folded fraction than lysozyme that had been stored in aqueous buffer. These results suggest that biocompatibility and protein stabilization characteristics can be rationally designed into ionic liquids.
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Affiliation(s)
- Regina M Vrikkis
- Department of Mechanical Engineering, University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC 28223, USA.
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20
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Ortore MG, Spinozzi F, Mariani P, Paciaroni A, Barbosa LRS, Amenitsch H, Steinhart M, Ollivier J, Russo D. Combining structure and dynamics: non-denaturing high-pressure effect on lysozyme in solution. J R Soc Interface 2009; 6 Suppl 5:S619-34. [PMID: 19570795 PMCID: PMC2843975 DOI: 10.1098/rsif.2009.0163.focus] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Accepted: 06/03/2009] [Indexed: 11/12/2022] Open
Abstract
Small-angle X-ray scattering (SAXS) and elastic and quasi-elastic neutron scattering techniques were used to investigate the high-pressure-induced changes on interactions, the low-resolution structure and the dynamics of lysozyme in solution. SAXS data, analysed using a global-fit procedure based on a new approach for hydrated protein form factor description, indicate that lysozyme completely maintains its globular structure up to 1500 bar, but significant modifications in the protein-protein interaction potential occur at approximately 600-1000 bar. Moreover, the mass density of the protein hydration water shows a clear discontinuity within this pressure range. Neutron scattering experiments indicate that the global and the local lysozyme dynamics change at a similar threshold pressure. A clear evolution of the internal protein dynamics from diffusing to more localized motions has also been probed. Protein structure and dynamics results have then been discussed in the context of protein-water interface and hydration water dynamics. According to SAXS results, the new configuration of water in the first hydration layer induced by pressure is suggested to be at the origin of the observed local mobility changes.
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Affiliation(s)
- Maria Grazia Ortore
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Francesco Spinozzi
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Paolo Mariani
- Dipartimento SAIFET, Sezione Scienze Fisiche, Università Politecnica delle Marche and CNISM, Ancona, Italy
| | - Alessandro Paciaroni
- Dipartimento di Fisica, Università degli Studi di Perugia and CNISM, Perugia, Italy
| | | | - Heinz Amenitsch
- Institute of Biophysics and Nanosystems Research, Austrian Academy of Sciences, Graz, Austria
| | - Milos Steinhart
- Institute of Macromolecular Chemistry, Prague, Czech Republic
| | | | - Daniela Russo
- CNR-INFM and CRS-SOFT, c/o Institut Laue-Langevin, Grenoble, France
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Ashton L, Dusting J, Imomoh E, Balabani S, Blanch EW. Shear-induced unfolding of lysozyme monitored in situ. Biophys J 2009; 96:4231-6. [PMID: 19450493 DOI: 10.1016/j.bpj.2009.02.024] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 02/10/2009] [Accepted: 02/13/2009] [Indexed: 10/20/2022] Open
Abstract
Conformational changes due to externally applied physiochemical parameters, including pH, temperature, solvent composition, and mechanical forces, have been extensively reported for numerous proteins. However, investigations on the effect of fluid shear flow on protein conformation remain inconclusive despite its importance not only in the research of protein dynamics but also for biotechnology applications where processes such as pumping, filtration, and mixing may expose protein solutions to changes in protein structure. By combining particle image velocimetry and Raman spectroscopy, we have successfully monitored reversible, shear-induced structural changes of lysozyme in well-characterized flows. Shearing of lysozyme in water altered the protein's backbone structure, whereas similar shear rates in glycerol solution affected the solvent exposure of side-chain residues located toward the exterior of the lysozyme alpha-domain. The results demonstrate the importance of measuring conformational changes in situ and of quantifying fluid stresses by the three-dimensional shear tensor to establish reversible unfolding or misfolding transitions occurring due to flow exposure.
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Affiliation(s)
- Lorna Ashton
- Manchester Interdisciplinary Biocentre & Faculty of Life Sciences, University of Manchester, Manchester M1 7DN, United Kingdom
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