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Torrent J, Lange R, Igel-Egalon A, Béringue V, Rezaei H. Getting to the core of prion superstructural variability. Prion 2015; 10:1-8. [PMID: 26636374 PMCID: PMC4981190 DOI: 10.1080/19336896.2015.1122161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The phenomenon of protein superstructural polymorphism has become the subject of increased research activity. Besides the relevance to explain the existence of multiple prion strains, such activity is partly driven by the recent finding that in many age-related neurodegenerative diseases highly ordered self-associated forms of peptides and proteins might be the structural basis of prion-like processes and strains giving rise to different disease phenotypes. Biophysical studies of prion strains have been hindered by a lack of tools to characterize inherently noncrystalline, heterogeneous and insoluble proteins. A description of the pressure response of prion quaternary structures might change this picture. This is because applying pressure induces quaternary structural changes of PrP, such as misfolding and self-assembly. From the thermodynamics of these processes, structural features in terms of associated volume changes can then be deduced. We suggest that conformation-enciphered prion strains can be distinguished in terms of voids in the interfaces of the constituting PrP protomers and thus in their volumetric properties.
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Affiliation(s)
- Joan Torrent
- a Institut National de la Recherche Agronomique, UR892, Virologie Immunologie Moléculaires , Jouy-en-Josas , France
| | - Reinhard Lange
- b Institut National de la Recherche Agronomique, UMR1208, Ingénierie des Agropolymères et Technologies Emergentes, Université Montpellier , Montpellier , France
| | - Angelique Igel-Egalon
- a Institut National de la Recherche Agronomique, UR892, Virologie Immunologie Moléculaires , Jouy-en-Josas , France
| | - Vincent Béringue
- a Institut National de la Recherche Agronomique, UR892, Virologie Immunologie Moléculaires , Jouy-en-Josas , France
| | - Human Rezaei
- a Institut National de la Recherche Agronomique, UR892, Virologie Immunologie Moléculaires , Jouy-en-Josas , France
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Silva JL, Oliveira AC, Vieira TCRG, de Oliveira GAP, Suarez MC, Foguel D. High-Pressure Chemical Biology and Biotechnology. Chem Rev 2014; 114:7239-67. [DOI: 10.1021/cr400204z] [Citation(s) in RCA: 152] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jerson L. Silva
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Andrea C. Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Tuane C. R. G. Vieira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Guilherme A. P. de Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Marisa C. Suarez
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
| | - Debora Foguel
- Instituto de Bioquímica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem,
Centro Nacional de Ressonância Magnética Nuclear Jiri
Jonas, and ‡Polo Xerém, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil
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Surmacz-Chwedoruk W, Malka I, Bożycki Ł, Nieznańska H, Dzwolak W. On the heat stability of amyloid-based biological activity: insights from thermal degradation of insulin fibrils. PLoS One 2014; 9:e86320. [PMID: 24466022 PMCID: PMC3897677 DOI: 10.1371/journal.pone.0086320] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 12/13/2013] [Indexed: 11/18/2022] Open
Abstract
Formation of amyloid fibrils in vivo has been linked to disorders such as Alzheimer's disease and prion-associated transmissible spongiform encephalopathies. One of the characteristic features of amyloid fibrils is the high thermodynamic stability relative both to native and disordered states which is also thought to underlie the perplexingly remarkable heat resistance of prion infectivity. Here, we are comparing high-temperature degradation of native and fibrillar forms of human insulin. Decomposition of insulin amyloid has been studied under helium atmosphere and in the temperature range from ambient conditions to 750°C using thermogravimetry and differential scanning calorimetry coupled to mass spectrometry. While converting native insulin into amyloid does upshift onset of thermal decomposition by ca. 75°C, fibrils remain vulnerable to covalent degradation at temperatures below 300°C, as reflected by mass spectra of gases released upon heating of amyloid samples, as well as morphology and infrared spectra of fibrils subjected to incubation at 250°C. Mass spectra profiles of released gases indicate that degradation of fibrils is much more cooperative than degradation of native insulin. The data show no evidence of water of crystallization trapped within insulin fibrils. We have also compared untreated and heated amyloid samples in terms of capacity to seed daughter fibrils. Kinetic traces of seed-induced insulin fibrillation have shown that the seeding potency of amyloid samples decreases significantly already after exposure to 200°C, even though corresponding electron micrographs indicated persisting fibrillar morphology. Our results suggest that amyloid-based biological activity may not survive extremely high temperature treatments, at least in the absence of other stabilizing factors.
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Affiliation(s)
- Weronika Surmacz-Chwedoruk
- Institute of Biotechnology and Antibiotics, Warsaw, Poland
- Institute of High Pressure Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Iwona Malka
- Institute of High Pressure Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Łukasz Bożycki
- Institute of High Pressure Physics, Polish Academy of Sciences, Warsaw, Poland
| | - Hanna Nieznańska
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, Warsaw, Poland
| | - Wojciech Dzwolak
- Institute of High Pressure Physics, Polish Academy of Sciences, Warsaw, Poland
- Department of Chemistry, University of Warsaw, Warsaw, Poland
- * E-mail:
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Torrent J, Lange R. High pressure, a tool to switch between soluble and fibrillar prion protein structures. Commun Integr Biol 2012; 5:30-3. [PMID: 22482006 DOI: 10.4161/cib.17969] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The native soluble as well as different aggregated states of recombinant prion proteins are highly sensitive to high pressure. On the one hand, its application to the native α-helical protein induces reversibly a metastable structure that relaxes to amyloid fibrils after prolonged incubation. On the other hand, its application to synthetic prion amyloid fibrils leads to partial disaggregation into native monomers as well as to proto-filaments that have lost several amyloid features. In addition, heat-induced β-sheet prion protein aggregates are dissolved and revert into α-helical monomers by applying high pressure. This profound pressure sensitivity of prion protein structure is explained by large volume differences of the different structural states. Hence, pressure appears as a suitable thermodynamic parameter for exploring the highly complex conformational landscape of prion protein. Its further analysis should help identifying prion protein structural states that are on the pathogenic pathway.
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Follonier S, Panke S, Zinn M. Pressure to kill or pressure to boost: a review on the various effects and applications of hydrostatic pressure in bacterial biotechnology. Appl Microbiol Biotechnol 2012; 93:1805-15. [DOI: 10.1007/s00253-011-3854-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 12/17/2011] [Accepted: 12/19/2011] [Indexed: 02/02/2023]
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Segovia Bravo K, Ramírez R, Durst R, Escobedo-Avellaneda Z, Welti-Chanes J, Sanz P, Torres J. Formation Risk of Toxic and Other Unwanted Compounds in Pressure-Assisted Thermally Processed Foods. J Food Sci 2011; 77:R1-10. [DOI: 10.1111/j.1750-3841.2011.02451.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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El Moustaine D, Perrier V, Van Ba IAT, Meersman F, Ostapchenko VG, Baskakov IV, Lange R, Torrent J. Amyloid features and neuronal toxicity of mature prion fibrils are highly sensitive to high pressure. J Biol Chem 2011; 286:13448-59. [PMID: 21357423 PMCID: PMC3075691 DOI: 10.1074/jbc.m110.192872] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 02/24/2011] [Indexed: 12/22/2022] Open
Abstract
Prion proteins (PrP) can aggregate into toxic and possibly infectious amyloid fibrils. This particular macrostructure confers on them an extreme and still unexplained stability. To provide mechanistic insights into this self-assembly process, we used high pressure as a thermodynamic tool for perturbing the structure of mature amyloid fibrils that were prepared from recombinant full-length mouse PrP. Application of high pressure led to irreversible loss of several specific amyloid features, such as thioflavin T and 8-anilino-1-naphthalene sulfonate binding, alteration of the characteristic proteinase K digestion pattern, and a significant decrease in the β-sheet structure and cytotoxicity of amyloid fibrils. Partial disaggregation of the mature fibrils into monomeric soluble PrP was observed. The remaining amyloid fibrils underwent a change in secondary structure that led to morphologically different fibrils composed of a reduced number of proto-filaments. The kinetics of these reactions was studied by recording the pressure-induced dissociation of thioflavin T from the amyloid fibrils. Analysis of the pressure and temperature dependence of the relaxation rates revealed partly unstructured and hydrated kinetic transition states and highlighted the importance of collapsing and hydrating inter- and intramolecular cavities to overcome the high free energy barrier that stabilizes amyloid fibrils.
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Affiliation(s)
- Driss El Moustaine
- From the University of Montpellier 2 and
- INSERM, U710, Montpellier F-34095, France
- Ecole Pratique des Hautes Études, Paris F-75007, France
| | - Veronique Perrier
- From the University of Montpellier 2 and
- INSERM, U710, Montpellier F-34095, France
- Ecole Pratique des Hautes Études, Paris F-75007, France
| | - Isabelle Acquatella-Tran Van Ba
- From the University of Montpellier 2 and
- INSERM, U710, Montpellier F-34095, France
- Ecole Pratique des Hautes Études, Paris F-75007, France
| | - Filip Meersman
- the Department of Chemistry, Katholieke Universiteit Leuven, Leuven B-3001, Belgium, and
| | - Valeriy G. Ostapchenko
- the Center for Biomedical Engineering and Technology, Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Ilia V. Baskakov
- the Center for Biomedical Engineering and Technology, Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Reinhard Lange
- From the University of Montpellier 2 and
- INSERM, U710, Montpellier F-34095, France
- Ecole Pratique des Hautes Études, Paris F-75007, France
| | - Joan Torrent
- From the University of Montpellier 2 and
- INSERM, U710, Montpellier F-34095, France
- Ecole Pratique des Hautes Études, Paris F-75007, France
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Aertsen A, Meersman F, Hendrickx ME, Vogel RF, Michiels CW. Biotechnology under high pressure: applications and implications. Trends Biotechnol 2009; 27:434-41. [DOI: 10.1016/j.tibtech.2009.04.001] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2009] [Revised: 04/15/2009] [Accepted: 04/17/2009] [Indexed: 11/26/2022]
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Hydration effects on the HET-s prion and amyloid-beta fibrillous aggregates, studied with three-dimensional molecular theory of solvation. Biophys J 2008; 95:4540-8. [PMID: 18689456 DOI: 10.1529/biophysj.107.123000] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
We study the thermodynamic properties of the experimental fragments of the amyloid fibril made of the HET-s prion proteins (the infectious element of the filamentous fungus Podospora anserina) and of amyloid-beta proteins (the major component of Alzheimer's disease-associated plaques) by using the three-dimensional molecular theory of solvation. The full quantitative picture of hydration effects, including the hydration thermodynamics and hydration structure around the fragments, is presented. For both the complexes, the hydration entropic effects dominate, which results in the entropic part offsetting the unfavorable energetic part of the free energy change upon the association. This is in accord with the fact that the hydrophobic cooperativity plays an essential role in the formation of amyloid fibrils. By calculating the partial molar volume of the proteins, we found that the volume change upon the association in both the systems is large and positive, with the implication that high pressure causes destabilization of the fibril. This observation is in good agreement with the recent experimental results. We also found that both the HET-s and amyloid-beta pentamers have loose intermolecular packing with voids. The three-dimensional molecular theory of solvation predicts that water molecules can be locked in the interior cavities along the fibril axis for both the HET-s and amyloid-beta proteins. We provide a detailed molecular picture of the structural water localized in the interior of the fibrils. Our results suggest that the interior hydration plays an important role in the structural stability of fibrils.
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Heindl P, Garcia AF, Butz P, Trierweiler B, Voigt H, Pfaff E, Tauscher B. High pressure/temperature treatments to inactivate highly infectious prion subpopulations. INNOV FOOD SCI EMERG 2008. [DOI: 10.1016/j.ifset.2007.07.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Considine KM, Kelly AL, Fitzgerald GF, Hill C, Sleator RD. High-pressure processing--effects on microbial food safety and food quality. FEMS Microbiol Lett 2008; 281:1-9. [PMID: 18279335 DOI: 10.1111/j.1574-6968.2008.01084.x] [Citation(s) in RCA: 205] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
High-pressure processing (HPP) is a nonthermal process capable of inactivating and eliminating pathogenic and food spoilage microorganisms. This novel technology has enormous potential in the food industry, controlling food spoilage, improving food safety and extending product shelf life while retaining the characteristics of fresh, preservative-free, minimally processed foods. As with other food processing methods, such as thermal processing, HPP has somewhat limited applications as it cannot be universally applied to all food types, such as some dairy and animal products and shelf-stable low-acid foods. Herein, we discuss the effects of high-pressure processing on microbial food safety and, to a lesser degree, food quality.
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Müller H, Stitz L, Wille H, Prusiner SB, Riesner D. Influence of water, fat, and glycerol on the mechanism of thermal prion inactivation. J Biol Chem 2007; 282:35855-67. [PMID: 17878157 DOI: 10.1074/jbc.m706883200] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Extending the recent analysis of the safety of industrial bovine fat-derived products for human consumption (Müller, H., Stitz, L., and Riesner, D. (2006) Eur. J. Lip. Sci. Technol. 108, 812-826), we investigated systematically the effects of fat, fatty acids, and glycerol on the heat destruction of prions. Prion destruction was qualitatively and quantitatively evaluated in PrP 27-30, or prion rods, by the inactivation of infectivity as well as by the degradation of the polypeptide backbone. Under all conditions analyzed, inactivation of prion infectivity was achieved more efficiently than backbone degradation by several orders of magnitude. The presence of fat enhanced prion inactivation and offers a mild treatment for prion decontamination. In contrast, the presence of fat, fatty acids, and especially glycerol protected the PrP 27-30 backbone against heat-induced degradation. Glycerol also protected against heat-induced inactivation of prion infectivity. A phase distribution analysis demonstrated that prions migrated to the interphase of a fat/water mixture at room temperature and accumulated in the water phase at higher temperatures. In a systematic study of the mechanism of prion destruction, we found an intermediate structure of PrP that has fewer fibrils in beta-sheet formation, lower resistance to protease digestion, greater aggregation, and reduced solubility compared with PrP 27-30 but retains residual infectivity. These findings suggest that prion infectivity depends on beta-sheet-rich fibrillar structure and that inactivation proceeds in a stepwise manner, which explains the tailing effect frequently observed during inactivation.
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Affiliation(s)
- Henrik Müller
- Institut für Physikalische Biologie, Heinrich Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany
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Aymerich T, Picouet PA, Monfort JM. Decontamination technologies for meat products. Meat Sci 2007; 78:114-29. [PMID: 22062101 DOI: 10.1016/j.meatsci.2007.07.007] [Citation(s) in RCA: 184] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2007] [Revised: 07/04/2007] [Accepted: 07/09/2007] [Indexed: 10/23/2022]
Abstract
Consumers demand high quality, natural, nutritious, fresh appearance and convenient meat products with natural flavour and taste and an extended shelf-life. To match all these demands without compromising safety, in the last decades alternative non-thermal preservation technologies such as HHP, irradiation, light pulses, natural biopreservatives together with active packaging have been proposed and further investigated. They are efficient to inactivate the vegetative microorganisms, most commonly related to food-borne diseases, but not spores. The combination of several non-thermal and thermal preservation technologies under the so-called hurdle concept has also been investigated in order to increase their efficiency. Quick thermal technologies such as microwave and radiofrequency tunnels or steam pasteurization bring new possibilities to the pasteurization of meat products especially in ready to eat meals. Their application after final packaging will prevent further cross-contamination during post-processing handling. The benefits of these new technologies and their limitations in an industrial application will be presented and discussed.
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Affiliation(s)
- T Aymerich
- IRTA, Finca Camps i Armet, E-17121 Monells, Girona, Spain
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Toepfl S, Mathys A, Heinz V, Knorr D. Review: Potential of High Hydrostatic Pressure and Pulsed Electric Fields for Energy Efficient and Environmentally Friendly Food Processing. FOOD REVIEWS INTERNATIONAL 2006. [DOI: 10.1080/87559120600865164] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Knorr D, Heinz V, Buckow R. High pressure application for food biopolymers. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:619-31. [PMID: 16540383 DOI: 10.1016/j.bbapap.2006.01.017] [Citation(s) in RCA: 207] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2005] [Revised: 01/23/2006] [Accepted: 01/23/2006] [Indexed: 11/18/2022]
Abstract
High hydrostatic pressure constitutes an efficient physical tool to modify food biopolymers, such as proteins or starches. This review presents data on the effects of high hydrostatic pressure in combination with temperature on protein stability, enzymatic activity and starch gelatinization. Attention is given to the protein thermodynamics in response to combined pressure and temperature treatments specifically on the pressure-temperature-isokineticity phase diagrams of selected enzymes, prions and starches relevant in food processing and biotechnology.
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Affiliation(s)
- Dietrich Knorr
- Department of Food Biotechnology and Food Process Engineering, Berlin Technical University, Königin-Luise-Str. 22, D-14195 Berlin, Germany.
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Balny C. What lies in the future of high-pressure bioscience? BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:632-9. [PMID: 16275135 DOI: 10.1016/j.bbapap.2005.10.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2005] [Revised: 09/22/2005] [Accepted: 10/06/2005] [Indexed: 11/28/2022]
Abstract
Without being comprehensive in this mini-review, I will address perspectives, some speculative, for the development and use of high pressure to explore biochemical phenomena. This will be illustrated with several examples.
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Affiliation(s)
- Claude Balny
- INSERM U710, IFR 122, Université Montpellier 2, Place Eugène Bataillon, CC105, 34095 Montpellier, Cédex 5, France.
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Heindl P, García AF, Butz P, Pfaff E, Tauscher B. Protein conformation determines the sensibility to high pressure treatment of infectious scrapie prions. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:552-7. [PMID: 16446130 DOI: 10.1016/j.bbapap.2005.12.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Revised: 12/20/2005] [Accepted: 12/21/2005] [Indexed: 11/22/2022]
Abstract
Application of high pressure can be used for gentle pasteurizing of food, minimizing undesirable alterations such as vitamin losses and changes in taste and color. In addition, pressure has become a useful tool for investigating structural changes in proteins. Treatments of proteins with high pressure can reveal conformations that are not obtainable by other physical variables like temperature, since pressure favors structural transitions accompanied with smaller volumes. Here, we discuss both the potential use of high pressure to inactivate infectious TSE material and the application of this thermodynamic parameter for the investigation of prion folding. This review summarizes our findings on the effects of pressure on the structure of native infectious scrapie prions in hamster brain homogenates and on the structure of infectious prion rods isolated from diseased hamsters brains. Native prions were found to be pressure sensitive, whereas isolated prions revealed an extreme pressure-resistant structure. The discussion will be focused on the different pressure behavior of these prion isoforms, which points out differences in the protein structure that have not been taken into consideration before.
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Affiliation(s)
- Philipp Heindl
- Federal Research Center for Nutrition and Food, Institute of Chemistry and Biology, Haid-und-Neu-Str. 9, 76131 Karlsruhe, Germany.
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Cardone F, Brown P, Meyer R, Pocchiari M. Inactivation of transmissible spongiform encephalopathy agents in food products by ultra high pressure-temperature treatment. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:558-62. [PMID: 16542885 DOI: 10.1016/j.bbapap.2006.01.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2005] [Revised: 01/17/2006] [Accepted: 01/30/2006] [Indexed: 11/28/2022]
Abstract
Bovine spongiform encephalopathy (BSE) contamination of the human food chain most likely resulted from nervous system tissue in mechanically recovered meat used in the manufacture of processed meats. The availability of effective decontamination methods for products considered at risk for BSE or other transmissible spongiform encephalopathies (TSEs) would be an attractive safeguard to human health, but neither of the two proven inactivating methods, autoclaving or exposure to strong alkali or bleach, are applicable to foodstuffs. Ultra high pressure-temperature treatment of foods is an effective decontamination method that can reduce the pathogen load while keeping unaltered the nutritional and organoleptic properties of the product. The application of different combinations of high pressure-temperature pulses to meat products 'spiked' with the agents of TSEs can reduce the level of infectivity by 10(3) to 10(6) mean lethal doses (LD(50)) per gram of tissue. These data indicate that the high pressure-temperature treatment is a ready-to-use and feasible strategy to reduce the risk of TSEs transmission via contaminated meat products.
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Affiliation(s)
- Franco Cardone
- Degenerative and Inflammatory Neurological Diseases Unit, Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Rome, Italy.
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Dzwolak W. Tuning amyloidogenic conformations through cosolvents and hydrostatic pressure: when the soft matter becomes even softer. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2006; 1764:470-80. [PMID: 16480937 DOI: 10.1016/j.bbapap.2005.12.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2005] [Revised: 11/29/2005] [Accepted: 12/13/2005] [Indexed: 11/19/2022]
Abstract
Compact packing, burial of hydrophobic side-chains, and low free energy levels of folded conformations contribute to stability of native proteins. Essentially, the same factors are implicated in an even higher stability of mature amyloid fibrils. Although both native insulin and insulin amyloid are resistant to high pressure and influence of cosolvents, intermediate aggregation-prone conformations are susceptible to either condition. Consequently, insulin fibrillation may be tuned under hydrostatic pressure or-- through cosolvents and cosolutes-- by preferential exclusion or binding. Paradoxically, under high pressure, which generally disfavors aggregation of insulin, an alternative "low-volume" aggregation pathway, which leads to unique circular amyloid is permitted. Likewise, cosolvents are capable of preventing, or altering amyloidogenesis of insulin. As a result of cosolvent-induced perturbation, distinct conformational variants of fibrils are formed. Such variants, when used as templates for seeding daughter generations, reproduce initial folding patterns regardless of environmental biases. By the close analogy, this suggests that the "prion strains" phenomenon may mirror a generic, common feature in amyloids. The susceptibility of amyloidogenic conformations to pressure and cosolvents is likely to arise from their "frustration", as unfolding results in less-densely packed side-chains, void volumes, and exposure of hydrophobic groups. The effects of cosolvents and pressure are discussed in the context of studies on other amyloidogenic protein models, amyloid polymorphism, and "strains".
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Affiliation(s)
- Wojciech Dzwolak
- Institute of High Pressure Physics, Polish Academy of Sciences, Sokolowska 29/37, 01-142 Warsaw, Poland.
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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: 125] [Impact Index Per Article: 6.6] [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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23
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Torrent J, Alvarez-Martinez MT, Liautard JP, Lange R. Modulation of prion protein structure by pressure and temperature. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2005; 1764:546-51. [PMID: 16298177 DOI: 10.1016/j.bbapap.2005.10.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2005] [Revised: 10/14/2005] [Accepted: 10/17/2005] [Indexed: 10/25/2022]
Abstract
High pressure and temperature have been used efficiently to shed light on prion protein structure and folding. These physical parameters induce different conformational states of the prion protein, suggesting that prion structural changes occur within a complex energy landscape. Pressure has been used to prevent and even reverse prion protein aggregation. Alternatively, depending on experimental conditions, pressure also promotes prion protein aggregation leading to the formation of amorphous aggregates and amyloid fibrils. The latter ones show all characteristics of the pathogenic scrapie form. Furthermore, the pressure effects on prion protein structure appear to be strongly dependent on the integrity of the disulfide bond. In this paper, we discuss the mechanism and the origin of these opposing effects of pressure, taking the truncated form of hamster prion protein (SHaPrP(90-231)) as a model.
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Affiliation(s)
- Joan Torrent
- INSERM U710, CC 105, IFR 122, Université Montpellier 2, Place Eugène Bataillon, F-34095 Montpellier cédex 5, France.
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Heindl P, Fernández García A, Büttner M, Voigt H, Butz P, Tauscher B, Pfaff E. Some physico-chemical parameters that influence proteinase K resistance and the infectivity of PrP Sc after high pressure treatment. Braz J Med Biol Res 2005; 38:1223-31. [PMID: 16082463 DOI: 10.1590/s0100-879x2005000800010] [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: 11/22/2022] Open
Abstract
Crude brain homogenates of terminally diseased hamsters infected with the 263 K strain of scrapie (PrP Sc) were heated and/or pressurized at 800 MPa at 60 degrees C for different times (a few seconds or 5, 30, 120 min) in phosphate-buffered saline (PBS) of different pH and concentration. Prion proteins were analyzed on immunoblots for their proteinase K (PK) resistance, and in hamster bioassays for their infectivity. Samples pressurized under initially neutral conditions and containing native PrP Sc were negative on immunoblots after PK treatment, and a 6-7 log reduction of infectious units per gram was found when the samples were pressurized in PBS of pH 7.4 for 2 h. A pressure-induced change in the protein conformation of native PrP Sc may lead to less PK resistant and less infectious prions. However, opposite results were obtained after pressurizing native infectious prions at slightly acidic pH and in PBS of higher concentration. In this case an extensive fraction of native PrP Sc remained PK resistant after pressure treatment, indicating a protective effect possibly due to induced aggregation of prion proteins in such buffers.
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Affiliation(s)
- P Heindl
- Federal Research Center for Nutrition and Food, Institute of Chemistry and Biology, Karlsruhe, Germany.
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25
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Cordeiro Y, Kraineva J, Winter R, Silva JL. Volume and energy folding landscape of prion protein revealed by pressure. Braz J Med Biol Res 2005; 38:1195-201. [PMID: 16082459 DOI: 10.1590/s0100-879x2005000800006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The main hypothesis for prion diseases proposes that the cellular protein (PrP C) can be altered into a misfolded, ss-sheet-rich isoform, the PrP Sc (from scrapie). The formation of this abnormal isoform then triggers the transmissible spongiform encephalopathies. Here, we discuss the use of high pressure as a tool to investigate this structural transition and to populate possible intermediates in the folding/unfolding pathway of the prion protein. The latest findings on the application of high pressure to the cellular prion protein and to the scrapie PrP forms will be summarized in this review, which focuses on the energetic and volumetric properties of prion folding and conversion.
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Affiliation(s)
- Y Cordeiro
- Instituto de Bioquímica Médica, Centro Nacional de Ressonância Magnética Nuclear de Macromoléculas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil
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Affiliation(s)
- M F Patterson
- Department of Agriculture and Rural Development, Northern Ireland and Queen's University, Newforge Road, Belfast BT9 5PX, Northern Ireland, UK
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27
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Garcia AF, Heindl P, Voigt H, Büttner M, Butz P, Tauber N, Tauscher B, Pfaff E. Dual Nature of the Infectious Prion Protein Revealed by High Pressure. J Biol Chem 2005; 280:9842-7. [PMID: 15598650 DOI: 10.1074/jbc.m410679200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Crude brain homogenates of terminally diseased hamsters infected with the 263K strain of scrapie (PrP(Sc)) and purified prion fibrils were heated or pressurized at 800 megapascals and 60 degrees C for 2 h in different buffers and in water. Prion proteins (PrP) were analyzed for their proteinase K resistance in immunoblots and for their infectivity in hamster bioassays. A notable decrease in the proteinase K resistance of unpurified prion proteins, probably because of pressure-induced changes in the protein conformation of native PrP(Sc) or the N-truncated PrP-(27-30), could be demonstrated when pressurized at initially neutral conditions in several buffers and in water but not in a slightly acidic pH. A subsequent 6-7 log(10) reduction of infectious units/g in phosphate-buffered saline buffer, pH 7.4, was found. The proteinase K-resistant core was also not detectable after purification of prions extracted from pressurized samples, confirming pressure effects at the level of the secondary structure of prion proteins. However, opposite results were found after pressurizing purified prions, arguing for the existence of pressure-sensitive beta-structures (PrP(Sc)(DeltaPsen)) and extremely pressure-resistant beta-structures (PrP(Sc)(DeltaPres)). Remarkably, after the first centrifugation step at 540,000 x g during isolation, prions remained proteinase K-resistant when pressurized in all tested buffers and in water. It is known that purified fibrils retain infectivity, but the isolated protein (full and N-truncated) behaved differently from native PrP(Sc) under pressure, suggesting a kind of semicrystalline polymer structure.
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Affiliation(s)
- Avelina Fernandez Garcia
- Federal Research Centre for Nutrition and Food, Haid-und-Neustrasse 9, 76131 Karlsruhe, Germany.
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