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Knop JM, Mukherjee S, Jaworek MW, Kriegler S, Manisegaran M, Fetahaj Z, Ostermeier L, Oliva R, Gault S, Cockell CS, Winter R. Life in Multi-Extreme Environments: Brines, Osmotic and Hydrostatic Pressure─A Physicochemical View. Chem Rev 2023; 123:73-104. [PMID: 36260784 DOI: 10.1021/acs.chemrev.2c00491] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Elucidating the details of the formation, stability, interactions, and reactivity of biomolecular systems under extreme environmental conditions, including high salt concentrations in brines and high osmotic and high hydrostatic pressures, is of fundamental biological, astrobiological, and biotechnological importance. Bacteria and archaea are able to survive in the deep ocean or subsurface of Earth, where pressures of up to 1 kbar are reached. The deep subsurface of Mars may host high concentrations of ions in brines, such as perchlorates, but we know little about how these conditions and the resulting osmotic stress conditions would affect the habitability of such environments for cellular life. We discuss the combined effects of osmotic (salts, organic cosolvents) and hydrostatic pressures on the structure, stability, and reactivity of biomolecular systems, including membranes, proteins, and nucleic acids. To this end, a variety of biophysical techniques have been applied, including calorimetry, UV/vis, FTIR and fluorescence spectroscopy, and neutron and X-ray scattering, in conjunction with high pressure techniques. Knowledge of these effects is essential to our understanding of life exposed to such harsh conditions, and of the physical limits of life in general. Finally, we discuss strategies that not only help us understand the adaptive mechanisms of organisms that thrive in such harsh geological settings but could also have important ramifications in biotechnological and pharmaceutical applications.
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Affiliation(s)
- Jim-Marcel Knop
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Sanjib Mukherjee
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Michel W Jaworek
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Simon Kriegler
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Magiliny Manisegaran
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Zamira Fetahaj
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Lena Ostermeier
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
| | - Rosario Oliva
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany.,Department of Chemical Sciences, University of Naples Federico II, Via Cintia 4, 80126Naples, Italy
| | - Stewart Gault
- UK Centre for Astrobiology, SUPA School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, EH9 3FDEdinburgh, United Kingdom
| | - Charles S Cockell
- UK Centre for Astrobiology, SUPA School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, EH9 3FDEdinburgh, United Kingdom
| | - Roland Winter
- Department of Chemistry and Chemical Biology, Biophysical Chemistry, TU Dortmund University, D-44221Dortmund, Germany
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Biomolecules under Pressure: Phase Diagrams, Volume Changes, and High Pressure Spectroscopic Techniques. Int J Mol Sci 2022; 23:ijms23105761. [PMID: 35628571 PMCID: PMC9144967 DOI: 10.3390/ijms23105761] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/18/2022] [Accepted: 05/19/2022] [Indexed: 02/06/2023] Open
Abstract
Pressure is an equally important thermodynamical parameter as temperature. However, its importance is often overlooked in the biophysical and biochemical investigations of biomolecules and biological systems. This review focuses on the application of high pressure (>100 MPa = 1 kbar) in biology. Studies of high pressure can give insight into the volumetric aspects of various biological systems; this information cannot be obtained otherwise. High-pressure treatment is a potentially useful alternative method to heat-treatment in food science. Elevated pressure (up to 120 MPa) is present in the deep sea, which is a considerable part of the biosphere. From a basic scientific point of view, the application of the gamut of modern spectroscopic techniques provides information about the conformational changes of biomolecules, fluctuations, and flexibility. This paper reviews first the thermodynamic aspects of pressure science, the important parameters affecting the volume of a molecule. The technical aspects of high pressure production are briefly mentioned, and the most common high-pressure-compatible spectroscopic techniques are also discussed. The last part of this paper deals with the main biomolecules, lipids, proteins, and nucleic acids: how they are affected by pressure and what information can be gained about them using pressure. I I also briefly mention a few supramolecular structures such as viruses and bacteria. Finally, a subjective view of the most promising directions of high pressure bioscience is outlined.
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Somkuti J, Molnár OR, Smeller L. Revealing unfolding steps and volume changes of human telomeric i-motif DNA. Phys Chem Chem Phys 2020; 22:23816-23823. [DOI: 10.1039/d0cp03894f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The i-motif structure of the human telomeric DNA was destabilized by pressure and unfolded with a negative volume change.
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Affiliation(s)
- Judit Somkuti
- Department of Biophysics and Radiation Biology
- Semmelweis University
- Tuzolto utca 37-47 1094
- Hungary
| | - Orsolya Réka Molnár
- Department of Biophysics and Radiation Biology
- Semmelweis University
- Tuzolto utca 37-47 1094
- Hungary
| | - László Smeller
- Department of Biophysics and Radiation Biology
- Semmelweis University
- Tuzolto utca 37-47 1094
- Hungary
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Bak KH, Bolumar T, Karlsson AH, Lindahl G, Orlien V. Effect of high pressure treatment on the color of fresh and processed meats: A review. Crit Rev Food Sci Nutr 2017; 59:228-252. [DOI: 10.1080/10408398.2017.1363712] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- K. H. Bak
- University of Copenhagen, Faculty of Science, Department of Food Science, Frederiksberg C, Denmark
| | - T. Bolumar
- CSIRO, Agriculture and Food, Meat Science Team, Coopers Plains, Queensland, Australia
| | - A. H. Karlsson
- Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden
| | | | - V. Orlien
- University of Copenhagen, Faculty of Science, Department of Food Science, Frederiksberg C, Denmark
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Dhanasekaran M, Dhathathreyan A. Initiating fibro-proliferation through interfacial interactions of myoglobin colloids with collagen in solution. Int J Biol Macromol 2017; 101:117-125. [DOI: 10.1016/j.ijbiomac.2017.03.071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/02/2017] [Accepted: 03/14/2017] [Indexed: 10/19/2022]
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Cruz-Angeles J, Martínez LM, Videa M. Application of ATR-FTIR spectroscopy to the study of thermally induced changes in secondary structure of protein molecules in solid state. Biopolymers 2015; 103:574-84. [DOI: 10.1002/bip.22664] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/14/2015] [Accepted: 04/25/2015] [Indexed: 01/18/2023]
Affiliation(s)
- Jorge Cruz-Angeles
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
| | - Luz María Martínez
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
| | - Marcelo Videa
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
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Abstract
Proteins are essential players in the vast majority of molecular level life processes. Since their structure is in most cases substantial for their correct function, study of their structural changes attracted great interest in the past decades. The three dimensional structure of proteins is influenced by several factors including temperature, pH, presence of chaotropic and cosmotropic agents, or presence of denaturants. Although pressure is an equally important thermodynamic parameter as temperature, pressure studies are considerably less frequent in the literature, probably due to the technical difficulties associated to the pressure studies. Although the first steps in the high-pressure protein study have been done 100 years ago with Bridgman's ground breaking work, the field was silent until the modern spectroscopic techniques allowed the characterization of the protein structural changes, while the protein was under pressure. Recently a number of proteins were studied under pressure, and complete pressure-temperature phase diagrams were determined for several of them. This review summarizes the thermodynamic background of the typical elliptic p-T phase diagram, its limitations and the possible reasons for deviations of the experimental diagrams from the theoretical one. Finally we show some examples of experimentally determined pressure-temperature phase diagrams.
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Affiliation(s)
- László Smeller
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary,
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8
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Effects of High-Pressure Treatments on the Redox State of Porcine Myoglobin and Color Stability of Pork During Cold Storage. FOOD BIOPROCESS TECH 2013. [DOI: 10.1007/s11947-013-1118-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Bruins ME, Meersman F, Janssen AEM, Heremans K, Boom RM. Increased susceptibility of β-glucosidase from the hyperthermophile Pyrococcus furiosus to thermal inactivation at higher pressures. FEBS J 2008; 276:109-17. [DOI: 10.1111/j.1742-4658.2008.06759.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Patel BA, Debenedetti PG, Stillinger FH, Rossky PJ. A water-explicit lattice model of heat-, cold-, and pressure-induced protein unfolding. Biophys J 2007; 93:4116-27. [PMID: 17766342 PMCID: PMC2098741 DOI: 10.1529/biophysj.107.108530] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We investigate the effect of temperature and pressure on polypeptide conformational stability using a two-dimensional square lattice model in which water is represented explicitly. The model captures many aspects of water thermodynamics, including the existence of density anomalies, and we consider here the simplest representation of a protein: a hydrophobic homopolymer. We show that an explicit treatment of hydrophobic hydration is sufficient to produce cold, pressure, and thermal denaturation. We investigate the effects of the enthalpic and entropic components of the water-protein interactions on the overall folding phase diagram, and show that even a schematic model such as the one we consider yields reasonable values for the temperature and pressure ranges within which highly compact homopolymer configurations are thermodynamically stable.
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Affiliation(s)
- Bryan A Patel
- Department of Chemical Engineering, Princeton University, Princeton, New Jersey, USA.
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Eschelbach JW, Jorgenson JW. Improved protein recovery in reversed-phase liquid chromatography by the use of ultrahigh pressures. Anal Chem 2007; 78:1697-706. [PMID: 16503625 DOI: 10.1021/ac0518304] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect that elevated pressure used in ultrahigh-pressure liquid chromatography (UHPLC) has on protein recovery was investigated. Specifically, protein carryover ("ghosting") and recovery were examined. Four model proteins (ribonuclease A, ovalbumin, myoglobin, BSA) were separated by gradient RPLC at both conventional (160 bar) and ultrahigh pressures (>1500 bar). A custom gradient UHPLC system was used to generate conventional pressures on 5-microm diameter reversed-phase supports and ultrahigh pressures on identical 1.4-microm supports. The results indicate that, by increasing the pressure, protein carryover from run to run is reduced and in some cases eliminated above a certain threshold pressure for the model proteins studied. Further work indicates that recovery was enhanced for each of the proteins studied, even approaching 100% for certain proteins.
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Affiliation(s)
- John W Eschelbach
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, USA
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Danielewicz-Ferchmin I, Banachowicz EM, Ferchmin AR. Properties of Hydration Shells of Protein Molecules at their Pressure- and Temperature-Induced Native-Denatured Transition. Chemphyschem 2006; 7:2126-33. [PMID: 16955512 DOI: 10.1002/cphc.200600289] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Properties of water at the surface of biomolecules are important for their conformational stability. The behaviour of hydrating water at protein transition (t) pressures P(t) and temperatures T(t) , with the points (P(t),T(t) ) lying in the Native-Denatured (N-D) transition line, is studied. Hydration shells at the hydrophilic regions of protein molecules with surface charge density sigma are investigated with the help of the equation of state of water in an open system. The local values of sigma rather close to each other (sigma(D) approximately 0.3 C m(-2)) are found for six different experimental lines of the N-D transition found in the literature. The values sigma(D) correspond to the crossings of the total pressure (P(t)+Pi) vs sigma isotherms at different T(t) (Pi-electrostriction pressure). The pressures P(t) and temperatures T(t) appear to be related with some selected sites at the surfaces of the protein molecules.
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14
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Schay G, Smeller L, Tsuneshige A, Yonetani T, Fidy J. Allosteric Effectors Influence the Tetramer Stability of Both R- and T-states of Hemoglobin A. J Biol Chem 2006; 281:25972-83. [PMID: 16822864 DOI: 10.1074/jbc.m604216200] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The contribution of heterotropic effectors to hemoglobin allostery is still not completely understood. With the recently proposed global allostery model, this question acquires crucial significance, because it relates tertiary conformational changes to effector binding in both the R- and T-states. In this context, an important question is how far the induced conformational changes propagate from the binding site(s) of the allosteric effectors. We present a study in which we monitored the interdimeric interface when the effectors such as Cl-, 2,3-diphosphoglycerate, inositol hexaphosphate, and bezafibrate were bound. We studied oxy-Hb and a hybrid form (alphaFeO2)2-(betaZn)2 as the T-state analogue by monitoring heme absorption and Trp intrinsic fluorescence under hydrostatic pressure. We observed a pressure-dependent change in the intrinsic fluorescence, which we attribute to a pressure-induced tetramer to dimer transition with characteristic pressures in the 70-200-megapascal range. The transition is sensitive to the binding of allosteric effectors. We fitted the data with a simple model for the tetramer-dimer transition and determined the dissociation constants at atmospheric pressure. In the R-state, we observed a stabilizing effect by the allosteric effectors, although in the T-analogue a stronger destabilizing effect was seen. The order of efficiency was the same in both states, but with the opposite trend as inositol hexaphosphate > 2,3-diphosphoglycerate > Cl-. We detected intrinsic fluorescence from bound bezafibrate that introduced uncertainty in the comparison with other effectors. The results support the global allostery model by showing that conformational changes propagate from the effector binding site to the interdimeric interfaces in both quaternary states.
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Affiliation(s)
- Gusztáv Schay
- Department of Biophysics and Radiation Biology and Biophysics Research Group of the Hungarian Academy of Sciences, Faculty of Medicine, Semmelweis University, P. O. Box 263 H 1444 Budapest, Hungary
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Dirix C, Duvetter T, Loey A, Hendrickx M, Heremans K. The in situ observation of the temperature and pressure stability of recombinant Aspergillus aculeatus pectin methylesterase with Fourier transform IR spectroscopy reveals an unusual pressure stability of beta-helices. Biochem J 2006; 392:565-71. [PMID: 16050809 PMCID: PMC1316296 DOI: 10.1042/bj20050721] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The stability of recombinant Aspergillus aculeatus PME (pectin methylesterase), an enzyme with high beta-helix content, was studied as a function of pressure and temperature. The conformational stability was monitored using FTIR (Fourier transform IR) spectroscopy whereas the functional enzyme stability was monitored by inactivation studies. Protein unfolding followed by amorphous aggregation, which makes the process irreversible, was observed at temperatures above 50 degrees C. This could be correlated to the irreversible enzyme inactivation observed at that temperature. Hydrostatic pressure greater than 1 GPa was necessary to induce changes in the enzyme's secondary structure. No enzyme inactivation was observed at up to 700 MPa. Pressure increased PME stability towards thermal denaturation. At 200 MPa, temperatures above 60 degrees C were necessary to cause significant PME unfolding and loss of activity. These results may be relevant for an understanding of the extreme stability of amyloid fibrils for which beta-helices have been proposed as a structural element.
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Affiliation(s)
- Carolien Dirix
- *Department of Chemistry, Faculty of Sciences, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
| | - Thomas Duvetter
- †Centre of Food and Microbial Technology, Faculty of Applied Biosciences and Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 22, B-3001 Heverlee, Belgium
| | - Ann Van Loey
- †Centre of Food and Microbial Technology, Faculty of Applied Biosciences and Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 22, B-3001 Heverlee, Belgium
| | - Marc Hendrickx
- †Centre of Food and Microbial Technology, Faculty of Applied Biosciences and Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg 22, B-3001 Heverlee, Belgium
| | - Karel Heremans
- *Department of Chemistry, Faculty of Sciences, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium
- To whom correspondence should be addressed (email )
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Meersman F, Smeller L, Heremans K. Protein stability and dynamics in the pressure–temperature plane. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:346-54. [PMID: 16414316 DOI: 10.1016/j.bbapap.2005.11.019] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2005] [Revised: 11/23/2005] [Accepted: 11/28/2005] [Indexed: 10/25/2022]
Abstract
The pressure-temperature stability diagram of proteins and the underlying assumptions of the elliptical shape of the diagram are discussed. Possible extensions, such as aggregation and fibril formation, are considered. An important experimental observation is the extreme pressure stability of the mature fibrils. Molecular origins of the diagram in terms of models of the partial molar volume of a protein focus on cavities and hydration. Changes in thermal expansivity, compressibility and heat capacity in terms of fluctuations of the enthalpy and volume change of the unfolding should also focus on these parameters. It is argued that the study of water-soluble polymers might further our understanding of the stability diagram. Whereas the role of water in protein behaviour is unquestioned, the role of cavities is less clear.
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Affiliation(s)
- Filip Meersman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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Smeller L, Meersman F, Heremans K. Refolding studies using pressure: The folding landscape of lysozyme in the pressure–temperature plane. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:497-505. [PMID: 16504611 DOI: 10.1016/j.bbapap.2006.01.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2005] [Revised: 12/22/2005] [Accepted: 01/19/2006] [Indexed: 10/25/2022]
Abstract
Refolding of hen egg white lysozyme after pressure unfolding was measured by FTIR spectroscopy. The high-pressure treatment was found to be useful for unfolding/refolding studies because pressure acts against aggregation, and therefore no irreversible aggregation takes place during the pressure treatment. After the release of the pressure, folding intermediate structures were found which were formed during the decompression of the lysozyme. These were aggregation prone when heated, as indicated by their lower stability against aggregation. The intermediates were only formed if the protein was unfolded, subdenaturing pressures could not populate these intermediates. We introduced the notion of a superfunnel to describe the free energy landscape of interacting polypeptide chains. This can explain the propensity of folding intermediates to aggregate. A possible Gibbs-free energy landscape for lysozyme was constructed for the whole pressure-temperature plane.
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Affiliation(s)
- L Smeller
- Department of Biophysics and Radiation Biology, Semmelweis University, Puskin u. 9, PF 263, H-1444 Budapest, Hungary.
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Meersman F, Dobson CM. Probing the pressure-temperature stability of amyloid fibrils provides new insights into their molecular properties. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2005; 1764:452-60. [PMID: 16337233 DOI: 10.1016/j.bbapap.2005.10.021] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2005] [Accepted: 10/27/2005] [Indexed: 10/25/2022]
Abstract
A number of medical disorders, including Alzheimer's disease and type II diabetes, is characterised by the deposition of amyloid fibrils in tissue. The insolubility and size of the fibrils has largely precluded the determination of their structures at high resolution. Studies probing the stability of amyloid fibrils can reveal which non-covalent interactions are important in the formation and maintenance of the fibril structure. In particular, we review here the use of high hydrostatic pressure and high temperature as perturbation techniques. In general, small aggregates formed early in the assembly process can be dissociated by high pressure, but mature amyloid fibrils are highly pressure stable. This finding suggests that a temporal transition occurs during which side chain packing and hydrogen bond formation are optimised, whereas the hydrophobic effect and electrostatic interactions play a dominant role in the early stages of the aggregation. High temperatures, however, can disrupt most aggregates. Though the observed stability of amyloid fibrils is not unique to these structures, the notion that amyloid fibrils can represent the global minimum in free energy is supported by this type of investigations. Some implications regarding the nature of toxic species, associated with at least many of the amyloid disorders, and recently proposed structural models are discussed.
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Affiliation(s)
- Filip Meersman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
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Meersman F, Wang J, Wu Y, Heremans K. Pressure Effect on the Hydration Properties of Poly(N-isopropylacrylamide) in Aqueous Solution Studied by FTIR Spectroscopy. Macromolecules 2005. [DOI: 10.1021/ma051582d] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Filip Meersman
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom; Laboratory of Medicinal Research, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroederstraat 10, B-3000 Leuven, Belgium; Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, No. 10 of Qianwei Road, Changchun 130023, P. R. China; and Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven,
| | - Jing Wang
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom; Laboratory of Medicinal Research, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroederstraat 10, B-3000 Leuven, Belgium; Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, No. 10 of Qianwei Road, Changchun 130023, P. R. China; and Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven,
| | - Yuqing Wu
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom; Laboratory of Medicinal Research, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroederstraat 10, B-3000 Leuven, Belgium; Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, No. 10 of Qianwei Road, Changchun 130023, P. R. China; and Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven,
| | - Karel Heremans
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom; Laboratory of Medicinal Research, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroederstraat 10, B-3000 Leuven, Belgium; Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, No. 10 of Qianwei Road, Changchun 130023, P. R. China; and Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven,
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