101
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Chen G, Huang K, Miao M, Feng B, Campanella OH. Molecular Dynamics Simulation for Mechanism Elucidation of Food Processing and Safety: State of the Art. Compr Rev Food Sci Food Saf 2018; 18:243-263. [PMID: 33337012 DOI: 10.1111/1541-4337.12406] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/07/2018] [Accepted: 10/10/2018] [Indexed: 12/14/2022]
Abstract
Molecular dynamics (MD) simulation is a useful technique to study the interaction between molecules and how they are affected by various processes and processing conditions. This review summarizes the application of MD simulations in food processing and safety, with an emphasis on the effects that emerging nonthermal technologies (for example, high hydrostatic pressure, pulsed electric field) have on the molecular and structural characteristics of foods and biomaterials. The advances and potential projection of MD simulations in the science and engineering aspects of food materials are discussed and focused on research work conducted to study the effects of emerging technologies on food components. It is expected by showing key case studies that it will stir novel developments as a valuable tool to study the effects of emerging food technologies on biomaterials. This review is useful to food researchers and the food industry, as well as researchers and practitioners working on flavor and nutraceutical encapsulations, dietary carbohydrate product developments, modified starches, protein engineering, and other novel food applications.
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Affiliation(s)
- Gang Chen
- School of Food Science and Technology, Henan Univ. of Technology, 100 Lianhua St., Zhengzhou 450001, Henan, P. R. China.,State Key Laboratory of Food Science and Technology, Jiangnan Univ., 1800 Lihu Ave., Wuxi, 214122, Jiangsu, P. R. China
| | - Kai Huang
- State Key Laboratory of Food Science and Technology, Jiangnan Univ., 1800 Lihu Ave., Wuxi, 214122, Jiangsu, P. R. China
| | - Ming Miao
- State Key Laboratory of Food Science and Technology, Jiangnan Univ., 1800 Lihu Ave., Wuxi, 214122, Jiangsu, P. R. China
| | - Biao Feng
- State Key Laboratory of Food Science and Technology, Jiangnan Univ., 1800 Lihu Ave., Wuxi, 214122, Jiangsu, P. R. China
| | - Osvaldo H Campanella
- State Key Laboratory of Food Science and Technology, Jiangnan Univ., 1800 Lihu Ave., Wuxi, 214122, Jiangsu, P. R. China.,Agricultural and Biological Engineering, and Dept. of Food Science, Whistler Center for Carbohydrate Research, Purdue Univ., 745 Agriculture Mall Dr., West Lafayette, IN, 47906, U.S.A
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102
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Structural stability of human butyrylcholinesterase under high hydrostatic pressure. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1867:107-113. [PMID: 30414450 DOI: 10.1016/j.bbapap.2018.11.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 11/02/2018] [Accepted: 11/05/2018] [Indexed: 11/23/2022]
Abstract
Human butyrylcholinesterase is a nonspecific enzyme of clinical, pharmacological and toxicological significance. Although the enzyme is relatively stable, its activity is affected by numerous factors, including pressure. In this work, hydrostatic pressure dependence of the intrinsic tryptophan fluorescence in native and salted human butyrylcholinesterase was studied up to the maximum pressure at ambient temperature of about 1200 MPa. A correlated large shift toward long wavelengths and broadening observed at pressures between 200 and 700 MPa was interpreted as due to high pressure-induced denaturation of the protein, leading to an enhanced exposure of tryptophan residues into polar solvent environment. This transient process in native butyrylcholinesterase presumably involves conformational changes of the enzyme at both tertiary and secondary structure levels. Pressure-induced mixing of emitting local indole electronic transitions with quenching charge transfer states likely describes the accompanying fluorescence quenching that reveals different course from spectral changes. All the pressure-induced changes turned irreversible after passing a mid-point pressure of about 400 ± 50 MPa. Addition of either 0.1 M ammonium sulphate (a kosmotropic salt) or 0.1 M lithium thiocyanate (a chaotropic salt) to native enzyme similarly destabilized its structure.
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103
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Abe H, Takekiyo T, Yoshimura Y, Shimizu A, Ozawa S. Multiple crystal pathways and crystal polymorphs in protic ionic liquids. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.08.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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104
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Zhao L, Qin X, Han W, Wu X, Wang Y, Hu X, Ling J, Liao X. Novel application of CO2-assisted high pressure processing in cucumber juice and apple juice. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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105
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Effect of thermal and high-pressure treatments on the antirotaviral activity of human milk fractions. INNOV FOOD SCI EMERG 2018. [DOI: 10.1016/j.ifset.2018.03.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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106
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Pedrote MM, de Oliveira GAP, Felix AL, Mota MF, Marques MDA, Soares IN, Iqbal A, Norberto DR, Gomes AMO, Gratton E, Cino EA, Silva JL. Aggregation-primed molten globule conformers of the p53 core domain provide potential tools for studying p53C aggregation in cancer. J Biol Chem 2018; 293:11374-11387. [PMID: 29853637 PMCID: PMC6065177 DOI: 10.1074/jbc.ra118.003285] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 05/10/2018] [Indexed: 12/16/2022] Open
Abstract
The functionality of the tumor suppressor p53 is altered in more than 50% of human cancers, and many individuals with cancer exhibit amyloid-like buildups of aggregated p53. An understanding of what triggers the pathogenic amyloid conversion of p53 is required for the further development of cancer therapies. Here, perturbation of the p53 core domain (p53C) with subdenaturing concentrations of guanidine hydrochloride and high hydrostatic pressure revealed native-like molten globule (MG) states, a subset of which were highly prone to amyloidogenic aggregation. We found that MG conformers of p53C, probably representing population-weighted averages of multiple states, have different volumetric properties, as determined by pressure perturbation and size-exclusion chromatography. We also found that they bind the fluorescent dye 4,4'-dianilino-1,1'-binaphthyl-5,5'-disulfonic acid (bis-ANS) and have a native-like tertiary structure that occludes the single Trp residue in p53. Fluorescence experiments revealed conformational changes of the single Trp and Tyr residues before p53 unfolding and the presence of MG conformers, some of which were highly prone to aggregation. p53C exhibited marginal unfolding cooperativity, which could be modulated from unfolding to aggregation pathways with chemical or physical forces. We conclude that trapping amyloid precursor states in solution is a promising approach for understanding p53 aggregation in cancer. Our findings support the use of single-Trp fluorescence as a probe for evaluating p53 stability, effects of mutations, and the efficacy of therapeutics designed to stabilize p53.
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Affiliation(s)
- Murilo M Pedrote
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Guilherme A P de Oliveira
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil; Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, Virginia 22908.
| | - Adriani L Felix
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Michelle F Mota
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Mayra de A Marques
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Iaci N Soares
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Anwar Iqbal
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Douglas R Norberto
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Andre M O Gomes
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Biomedical Engineering Department, University of California, Irvine, California 92697-2717
| | - Elio A Cino
- Departamento de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG 31270-901, Brazil
| | - Jerson L Silva
- Programa de Biologia Estrutural, 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, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil.
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107
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Cinar H, Cinar S, Chan HS, Winter R. Pressure-Induced Dissolution and Reentrant Formation of Condensed, Liquid-Liquid Phase-Separated Elastomeric α-Elastin. Chemistry 2018; 24:8286-8291. [PMID: 29738068 DOI: 10.1002/chem.201801643] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Revised: 05/07/2018] [Indexed: 02/05/2023]
Abstract
We investigated the combined effects of temperature and pressure on liquid-liquid phase separation (LLPS) phenomena of α-elastin up to the multi-kbar regime. FT-IR spectroscopy, CD, UV/Vis absorption, phase-contrast light and fluorescence microscopy techniques were employed to reveal structural changes and mesoscopic phase states of the system. A novel pressure-induced reentrant LLPS was observed in the intermediate temperature range. A molecular-level picture, in particular on the role of hydrophobic interactions, hydration, and void volume in controlling LLPS phenomena is presented. The potential role of the LLPS phenomena in the development of early cellular compartmentalization is discussed, which might have started in the deep sea, where pressures up to the kbar level are encountered.
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Affiliation(s)
- Hasan Cinar
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Süleyman Cinar
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Hue Sun Chan
- Departments of Biochemistry and Molecular Genetics, Faculty of Medicine, University of Toronto, Toronto, Ontario, M5S 1A8, Canada
| | - Roland Winter
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
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108
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Abe H, Hamaya N, Koyama Y, Kishimura H, Takekiyo T, Yoshimura Y, Wakabayashi D, Funamori N, Matsuishi K. Long Periodic Structure of a Room-Temperature Ionic Liquid by High-Pressure Small-Angle X-Ray Scattering and Wide-Angle X-Ray Scattering: 1-Decyl-3-Methylimidazolium Chloride. Chemphyschem 2018; 19:1441-1447. [DOI: 10.1002/cphc.201701273] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Indexed: 01/01/2023]
Affiliation(s)
- Hiroshi Abe
- Department of Materials Science and Engineering; National Defense Academy; Yokosuka 239-8686 Japan
| | - Nozomu Hamaya
- Graduate School of Humanities and Sciences; Ochanomizu University; Tokyo 112-8610 Japan
| | - Yoshihiro Koyama
- Graduate School of Pure and Applied Science; University of Tsukuba; Tsukuba 305-8573 Japan
| | - Hiroaki Kishimura
- Department of Materials Science and Engineering; National Defense Academy; Yokosuka 239-8686 Japan
| | - Takahiro Takekiyo
- Department of Applied Chemistry; National Defense Academy; Yokosuka 239-8686 Japan
| | - Yukihiro Yoshimura
- Department of Applied Chemistry; National Defense Academy; Yokosuka 239-8686 Japan
| | - Daisuke Wakabayashi
- Institute of Materials Structure Science; High Energy Accelerator Research Organization (KEK); Tsukuba 305-0801 Japan
| | - Nobumasa Funamori
- Institute of Materials Structure Science; High Energy Accelerator Research Organization (KEK); Tsukuba 305-0801 Japan
| | - Kiyoto Matsuishi
- Graduate School of Pure and Applied Science; University of Tsukuba; Tsukuba 305-8573 Japan
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109
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Li R, Hou Z, Zou H, Wang Y, Liao X. Inactivation kinetics, structural, and morphological modification of mango soluble acid invertase by high pressure processing combined with mild temperatures. Food Res Int 2018; 105:845-852. [PMID: 29433281 DOI: 10.1016/j.foodres.2017.12.018] [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: 08/08/2017] [Revised: 12/03/2017] [Accepted: 12/08/2017] [Indexed: 11/28/2022]
Abstract
The activity, structure and morphology of mango soluble acid invertase (SAI) were investigated after high pressure processing (HPP) combined with mild temperature at 50-600MPa and 40-50°C. The activity of mango SAI was efficiently reduced by HPP at 50MPa/45 and 50°C, or 600MPa/40, 45 and 50°C, while it was increased by 10-30% after HPP at 50-200MPa/40°C. Significant antagonistic effect of pressure and temperature on the activity of SAI was observed at 50-400MPa/50°C. The secondary structure of SAI was not influenced by HPP. However, its tertiary structure was modified by HPP, and severer modification occurred with higher pressure, higher temperature, and longer treatment time. Results of atomic force microscope suggested that HPP at 400MPa/50°C for 2.5min induced dissociation of SAI, and HPP at 600MPa/50°C for 30min resulted aggregation of SAI.
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Affiliation(s)
- Renjie Li
- Beijing Advanced Innovation Centre for Food Nutrition and Human Health, Beijing Key Laboratory for Food Nonthermal Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, National Engineering Research Centre for Fruit and Vegetable Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Zhiqiang Hou
- Beijing Advanced Innovation Centre for Food Nutrition and Human Health, Beijing Key Laboratory for Food Nonthermal Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, National Engineering Research Centre for Fruit and Vegetable Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Hui Zou
- Beijing Advanced Innovation Centre for Food Nutrition and Human Health, Beijing Key Laboratory for Food Nonthermal Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, National Engineering Research Centre for Fruit and Vegetable Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yongtao Wang
- Beijing Advanced Innovation Centre for Food Nutrition and Human Health, Beijing Key Laboratory for Food Nonthermal Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, National Engineering Research Centre for Fruit and Vegetable Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Xiaojun Liao
- Beijing Advanced Innovation Centre for Food Nutrition and Human Health, Beijing Key Laboratory for Food Nonthermal Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, National Engineering Research Centre for Fruit and Vegetable Processing, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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110
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Chen G, Miao M, Jiang B, Jin J, Campanella OH, Feng B. Effects of high hydrostatic pressure on Rhizopus chinensis lipase: II. Intermediate states during unfolding. INNOV FOOD SCI EMERG 2018. [DOI: 10.1016/j.ifset.2017.08.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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111
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Nakajima T, Kuroi K, Nakasone Y, Okajima K, Ikeuchi M, Tokutomi S, Terazima M. Anomalous pressure effects on the photoreaction of a light-sensor protein from Synechocystis, PixD (Slr1694), and the compressibility change of its intermediates. Phys Chem Chem Phys 2018; 18:25915-25925. [PMID: 27711633 DOI: 10.1039/c6cp05091c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
SyPixD (Slr1694) is a blue-light receptor that contains a BLUF (blue-light sensor using a flavin chromophore) domain for the function of phototaxis. The key reaction of this protein is a light-induced conformational change and subsequent dissociation reaction from the decamer to the dimer. In this study, anomalous effects of pressure on this reaction were discovered, and changes in the compressibility of its short-lived intermediates were investigated. While the absorption spectra of the dark and light states are not sensitive to pressure, the formation yield of the first intermediate decreases with pressure to about 40% at 150 MPa. Upon blue-light illumination with a sufficiently strong intensity, the transient grating signal, which represents the dissociation of the SyPixD decamer, was observed at 0.1 MPa, and the signal intensity significantly decreased with increasing pressure. This behavior shows that the dissociation of the decamer from the second intermediate state is suppressed by pressure. However, while the decamer undergoes no dissociation upon excitation of one monomer unit at 0.1 MPa, dissociation is gradually induced with increasing pressure. For solving this strange behavior, the compressibility changes of the intermediates were measured as a function of pressure at weak light intensity. Interestingly, the compressibility change was negative at low pressure, but became positive with increasing pressure. Because the compressibility is related to the volume fluctuation, this observation suggests that the driving force for this reaction is fluctuation of the protein. The relationship between the cavities at the interfaces of the monomer units and the reactivity was also discussed.
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Affiliation(s)
- Tsubasa Nakajima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
| | - Kunisato Kuroi
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
| | - Yusuke Nakasone
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
| | - Koji Okajima
- Research Institute for Advanced Science and Technology, Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Masahiko Ikeuchi
- Department of Life Sciences (Biology), Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
| | - Satoru Tokutomi
- Research Institute for Advanced Science and Technology, Department of Biological Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Masahide Terazima
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
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112
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Silva JL, Cino EA, Soares IN, Ferreira VF, A. P. de Oliveira G. Targeting the Prion-like Aggregation of Mutant p53 to Combat Cancer. Acc Chem Res 2018; 51:181-190. [PMID: 29260852 DOI: 10.1021/acs.accounts.7b00473] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Prion-like behavior of several amyloidogenic proteins has been demonstrated in recent years. Despite having functional roles in some cases, irregular aggregation can have devastating consequences. The most commonly known amyloid diseases are Alzheimer's, Parkinson's, and Transmissible Spongiform Encephalopathies (TSEs). The pathophysiology of prion-like diseases involves the structural transformation of wild-type (wt) proteins to transmissible forms that can convert healthy proteins, generating aggregates. The mutant form of tumor suppressor protein, p53, has recently been shown to exhibit prion-like properties. Within the context of p53 aggregation and the search for ways to avert it, this review emphasizes discoveries, approaches, and research from our laboratory and others. Although its standard functions are strongly connected to tumor suppression, p53 mutants and aggregates are involved in cancer progression. p53 aggregates are heterogeneous assemblies composed of amorphous aggregates, oligomers, and amyloid-like fibrils. Evidence of these structures in tumor tissues, the in vitro capability for p53 mutants to coaggregate with wt protein, and the detection of cell-to-cell transmission indicate that cancer has the basic characteristics of prion and prion-like diseases. Various approaches aim to restore p53 functions in cancer. Methods include the use of small-molecule and peptide stabilizers of mutant p53, zinc administration, gene therapy, alkylating and DNA intercalators, and blockage of p53-MDM2 interaction. A primary challenge in developing small-molecule inhibitors of p53 aggregation is the large number of p53 mutations. Another issue is the inability to recover p53 function by dissociating mature fibrils. Consequently, efforts have emerged to target the intermediate species of the aggregation reaction. Φ-value analysis has been used to characterize the kinetics of the early phases of p53 aggregation. Our experiments using high hydrostatic pressure (HHP) and chemical denaturants have helped to clarify excited conformers of p53 that are prone to aggregation. Molecular dynamics (MD) and phasor analysis of single Trp fluorescence signals point toward the presence of preamyloidogenic conformations of p53, which are not observed for p63 or p73. Exploring the features of competent preamyloidogenic states of wt and different p53 mutants may provide a framework for designing personalized drugs for the restoration of p53 function. Protection of backbone hydrogen bonds (BHBs) has been shown to be an important factor for the stability of amyloidogenic proteins and was employed to identify and stabilize the structural defect resulting from the p53 Y220C mutation. Using MD simulations, we compared BHB protection factors between p53 family members to determine the donor-acceptor pairs in p53 that exhibit lower protection. The identification of structurally vulnerable sites in p53 should provide new insights into rational designs that can rapidly be screened using our experimental methodology. Through continued and combined efforts, the outlook is positive for the development of strategies for regulating p53 amyloid transformation.
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Affiliation(s)
- Jerson L. Silva
- Instituto
de Bioquı́mica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil
| | - Elio A. Cino
- Departamento
de Bioquímica e Imunologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, 31270-901 Belo
Horizonte, Brazil
| | - Iaci N. Soares
- Instituto
de Bioquı́mica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil
| | - Vitor F. Ferreira
- Departamento
de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal Fluminense, 24220-900 Rio de Janeiro, Brazil
| | - Guilherme A. P. de Oliveira
- Instituto
de Bioquı́mica Médica Leopoldo de Meis, Instituto
Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil
- Department
of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, Virginia 22908-0733, United States
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113
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Nusrat S, Khan RH. Exploration of ligand-induced protein conformational alteration, aggregate formation, and its inhibition: A biophysical insight. Prep Biochem Biotechnol 2018; 48:43-56. [PMID: 29106330 DOI: 10.1080/10826068.2017.1387561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The association of protein aggregates with plentiful human diseases has fascinated studies regarding the biophysical characterization of protein misfolding and ultimately their aggregate formation mechanism. Protein-ligand interaction, their mechanism, conformational changes by ligands, and protein aggregate formation have been studied upon exploiting experimental techniques and computational methodologies. Such studies for the exploration of ligand-induced conformational changes in protein, misfolding and aggregation, has confirmed drastic progresses in the study of aggregate formation pathways. This review comprises of an inclusive description of contemporary experimental techniques as well as theoretical improvements in the interpretation of the conformational properties of protein. We have also discussed various factors responsible for the microenvironment change around protein that sequentially causes amyloidoses. Biophysical techniques and cell-based assays to gain comprehensive understandings of protein-ligand interaction, protein folding, and aggregation pathways have also been described. The promising therapeutic methods used to inhibit the protein fibrillogenesis have also been discussed.
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Affiliation(s)
- Saima Nusrat
- a Interdisciplinary Biotechnology Unit , Aligarh Muslim University , Aligarh , Uttar Pradesh , India
| | - Rizwan Hasan Khan
- a Interdisciplinary Biotechnology Unit , Aligarh Muslim University , Aligarh , Uttar Pradesh , India
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114
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Effects of Cosolvents and Macromolecular Crowding on the Phase Transitions and Temperature-Pressure Stability of Chiral and Racemic Poly-Lysine. Z PHYS CHEM 2018. [DOI: 10.1515/zpch-2017-1012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Abstract
FTIR spectroscopy has been used to reveal the effects of different types of cosolvents (TMAO, urea) as well as macromolecular crowding (using the crowding agent Ficoll) on the temperature and pressure dependent structure of poly-L-lysine, poly-D-lysine and their racemic mixture. Compared to the effects of cosolvents on the unfolding transition of proteins, their effects on the α-helix to aggregated β-sheet transition of polylysine are quite small. High hydrostatic pressure has been found to favor the α-helical state over the aggregated β-sheet structure which is reflected in a volume decrease of ΔV=−32 mL mol−1, indicating that the packing mode is more efficient in the α-helical structure. Both, addition of urea and TMAO lead to a decrease in pressure stability of the aggregated β-sheet structure, which is accompanied by a three-fold decrease in ΔV, whereas the macromolecular crowder has little effect on the β-to-α transition. The more than 3 kbar higher β-to-α transition pressure of the racemic mixture compared with PLL confirms the drastic stabilization of β-sheet aggregates if the stereoisomers PLL and PDL are combined. Changes in hydration and packing of the polypeptide occurs upon interaction and fine packing of the polypeptide’s chains of opposed chirality, which are slightly modulated by the properties of cosolute and crowding, only. The underlying solvational and packing mechanisms observed here may be decisive factors responsible for the spontaneous protein aggregation in general and, as such, may shed additional light on the molecular basis of amyloid-associated diseases.
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115
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Jaworek MW, Schuabb V, Winter R. The effects of glycine, TMAO and osmolyte mixtures on the pressure dependent enzymatic activity of α-chymotrypsin. Phys Chem Chem Phys 2018; 20:1347-1354. [DOI: 10.1039/c7cp06042d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Different natural osmolytes modulate the pressure dependent enzyme kinetics in different ways.
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Affiliation(s)
- Michel W. Jaworek
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- Technical University Dortmund
- 44227 Dortmund
- Germany
| | - Vitor Schuabb
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- Technical University Dortmund
- 44227 Dortmund
- Germany
| | - Roland Winter
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- Technical University Dortmund
- 44227 Dortmund
- Germany
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116
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Patra S, Anders C, Schummel PH, Winter R. Antagonistic effects of natural osmolyte mixtures and hydrostatic pressure on the conformational dynamics of a DNA hairpin probed at the single-molecule level. Phys Chem Chem Phys 2018; 20:13159-13170. [DOI: 10.1039/c8cp00907d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Osmolyte mixtures from deep sea organisms are able to rescue nucleic acids from pressure-induced unfolding.
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Affiliation(s)
- Satyajit Patra
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Christian Anders
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Paul Hendrik Schummel
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Roland Winter
- Physical Chemistry I – Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
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117
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Zou H, Ma Y, Xu Z, Liao X, Chen A, Yang S. Isolation of strawberry anthocyanins using high-speed counter-current chromatography and the copigmentation with catechin or epicatechin by high pressure processing. Food Chem 2017; 247:81-88. [PMID: 29277232 DOI: 10.1016/j.foodchem.2017.11.102] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 10/10/2017] [Accepted: 11/28/2017] [Indexed: 01/22/2023]
Abstract
Three anthocyanins were isolated from strawberry extract by high-speed counter-current chromatography, using a biphasic mixture of tert-butyl methyl ether, n-butanol, acetonitrile, water and trifluoroacetic acid (2.5:2.0:2.5:5.0:1.0%). The anthocyanins were identified as pelargonidin-3-rutinoside, cyanidin-3-glucoside and pelargonidin-3-glucoside with purity of 95.6%, 96.2% and 99.3% respectively. Additionally, the copigmentation reaction rates between pelargonidin-3-glucoside and phenolic acids (catechin or epicatechin) at pH 1.5 and 3.6, pressure 0.1 and 500 MPa, and temperature 60 °C were calculated. The absorbance of pelargonidin-3-glucoside at pH 3.6, with high quantity of phenolic acids was significantly increased by high pressure. The complex of pelargonidin-3-glucoside/catechin has a binding energy of 78.64 kJ/mol at pH 3.6, and 39.13 kJ/mol at pH 1.5; pelargonidin-3-glucoside/epicatechin has a binding energy of 75.34 kJ/mol at pH 1.5 and 54.47 kJ/mol at pH 3.6. The hydrogen bond and van der Waals interaction were the main forces contributing to the structures of complex.
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Affiliation(s)
- Hui Zou
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing Advanced Innovation Center for Food Nutrition and Human Health, National Engineering Research Centre for Fruit and Vegetable Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing Key Laboratory for Food Nonthermal Processing, Beijing 100083, China; Institute of Quality Standard & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China
| | - Yan Ma
- Institute of Agro-products Storage and Processing, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing Advanced Innovation Center for Food Nutrition and Human Health, National Engineering Research Centre for Fruit and Vegetable Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing Key Laboratory for Food Nonthermal Processing, Beijing 100083, China
| | - Zhenzhen Xu
- Institute of Quality Standard & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China.
| | - Xiaojun Liao
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing Advanced Innovation Center for Food Nutrition and Human Health, National Engineering Research Centre for Fruit and Vegetable Processing, Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing Key Laboratory for Food Nonthermal Processing, Beijing 100083, China
| | - Ailiang Chen
- Institute of Quality Standard & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China
| | - Shuming Yang
- Institute of Quality Standard & Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-food Safety and Quality, Ministry of Agriculture, Beijing 100081, China
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118
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Chen G, Wang L, Miao M, Jia C, Feng B. Coupled effects of salt and pressure on catalytic ability of Rhizopus chinensis lipase. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:5381-5387. [PMID: 28500670 DOI: 10.1002/jsfa.8427] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 05/01/2017] [Accepted: 05/09/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Both high pressure and environmental factors could influence the catalytic abilities of enzymes. This work investigated coupled effects of pressure and salts on Rhizopus chinensis lipase (RCL) to provide significant information for its further applications. RESULTS The maximum activity of RCL was observed under 200 MPa at 40 °C. The highest activity was achieved at concentrations of 0.06-0.1 mol L-1 for tested salts. The effect of monovalent cations on RCL activity followed the Hofmeister series (K+ > Na+ > Li+ ) at 0.1 MPa but the order of Na+ and K+ was changed under 200 MPa. Meanwhile, the effects of anions did not follow the Hofmeister series. KCl slightly improved the thermostability of RCL at moderate concentration. At 60 °C, LiCl only stabilised RCL at 0.1 mol L-1 . The pre-transition unfolding point was shifted from 4.5 to 3.5 mol L-1 with pressure increasing from 0.1 to 600 MPa. In addition, KCl could not change the lipase's extrinsic fluorescence evolution versus pressure. CONCLUSION Pressure and salts could improve catalytic ability and stability of RCL under appropriate conditions. The effect of high pressure on RCL was influenced by salts. Meanwhile salts cannot prevent high pressure-induced damage to RCL. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Gang Chen
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
| | - Lu Wang
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
| | - Ming Miao
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
| | - Chengsheng Jia
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
| | - Biao Feng
- School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, P.R. China
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119
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de Oliveira GA, Silva JL. The push-and-pull hypothesis in protein unfolding, misfolding and aggregation. Biophys Chem 2017; 231:20-26. [DOI: 10.1016/j.bpc.2017.03.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Revised: 03/25/2017] [Accepted: 03/27/2017] [Indexed: 01/17/2023]
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120
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Lemaire B. Hydrostatic pressure and the experimental toxicology of marine fishes: The elephant in the room. MARINE POLLUTION BULLETIN 2017; 124:206-210. [PMID: 28739107 DOI: 10.1016/j.marpolbul.2017.07.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 07/10/2017] [Accepted: 07/11/2017] [Indexed: 06/07/2023]
Abstract
Hydrostatic pressure (HP) increases linearly with depth in aquatic environments, so that many fish species routinely experience moderate-to-high HP levels (i.e., from a few to dozens of MPa). Biological effects of this thermodynamic variable are evidenced by a reduced functionality of many biomolecular systems, even in barotolerant and barophilic species. It is likely that environmentally-relevant HP levels (i.e., above atmospheric) could also modulate the responsiveness to and toxic effects of pollutants in fish. Still, only a few laboratories have investigated this possibility. The already-published ecobarotoxicological studies have brought strong support to the notion that HP can indeed modulate pollutant response in shallow-water and deep-sea animals. A careful reassessment of toxicity responses is therefore required. To quantify the exact influence of HP in marine fish toxicology, a research framework is proposed that should ensure the collection of meaningful data for risk assessment, using standard toxicity testing and mechanistic approaches.
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Affiliation(s)
- Benjamin Lemaire
- Institut des Sciences de la Vie, Université Catholique de Louvain, Louvain-la-Neuve 1348, Belgium.
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121
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Wang Q, Zhang C, Guo F, Li Z, Liu Y, Su Z. Novel Bioconjugation Strategy Using Elevated Hydrostatic Pressure: A Case Study for the Site-Specific Attachment of Polyethylene Glycol (PEGylation) of Recombinant Human Ciliary Neurotrophic Factor. Bioconjug Chem 2017; 28:2841-2848. [DOI: 10.1021/acs.bioconjchem.7b00531] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Qi Wang
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Chun Zhang
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
| | - Fangxia Guo
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Zenglan Li
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
- University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yongdong Liu
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
| | - Zhiguo Su
- State
Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North Second Street, Zhong-Guan
Village, Beijing 100190, PR China
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 210023, PR China
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122
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Pressure effects on α-synuclein amyloid fibrils: An experimental investigation on their dissociation and reversible nature. Arch Biochem Biophys 2017. [DOI: 10.1016/j.abb.2017.06.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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123
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Chen G, Miao M, Jiang B, Jin J, Campanella OH, Feng B. Effects of high hydrostatic pressure on lipase from Rhizopus chinensis: I. Conformational changes. INNOV FOOD SCI EMERG 2017. [DOI: 10.1016/j.ifset.2017.03.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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124
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Chen X, Tume RK, Xu X, Zhou G. Solubilization of myofibrillar proteins in water or low ionic strength media: Classical techniques, basic principles, and novel functionalities. Crit Rev Food Sci Nutr 2017; 57:3260-3280. [DOI: 10.1080/10408398.2015.1110111] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Xing Chen
- Key Laboratory of Animal Products Processing, Ministry of Agriculture, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, Jiangsu Synergetic Innovation Center of Meat Production and Processing, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
| | - Ron K. Tume
- Key Laboratory of Meat Processing and Quality Control, Nanjing Agricultural University, Nanjing, China
| | - Xinglian Xu
- Key Laboratory of Animal Products Processing, Ministry of Agriculture, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, Jiangsu Synergetic Innovation Center of Meat Production and Processing, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
| | - Guanghong Zhou
- Key Laboratory of Animal Products Processing, Ministry of Agriculture, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, Jiangsu Synergetic Innovation Center of Meat Production and Processing, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu, People's Republic of China
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125
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Dumard CH, Barroso SPC, Santos ACV, Alves NS, Couceiro JNSS, Gomes AMO, Santos PS, Silva JL, Oliveira AC. Stability of different influenza subtypes: How can high hydrostatic pressure be a useful tool for vaccine development? Biophys Chem 2017; 231:116-124. [PMID: 28410940 DOI: 10.1016/j.bpc.2017.04.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 04/05/2017] [Accepted: 04/05/2017] [Indexed: 01/15/2023]
Abstract
BACKGROUND Avian influenza A viruses can cross naturally into mammals and cause severe diseases, as observed for H5N1. The high lethality of human infections causes major concerns about the real risk of a possible pandemic of severe diseases to which human susceptibility may be high and universal. High hydrostatic pressure (HHP) is a valuable tool for studies regarding the folding of proteins and the assembly of macromolecular structures such as viruses; furthermore, HHP has already been demonstrated to promote viral inactivation. METHODS Here, we investigated the structural stability of avian and human influenza viruses using spectroscopic and light-scattering techniques. We found that both particles have similar structural stabilities and that HHP promotes structural changes. RESULTS HHP induced slight structural changes to both human and avian influenza viruses, and these changes were largely reversible when the pressure returned to its initial level. The spectroscopic data showed that H3N2 was more pressure-sensitive than H3N8. Structural changes did not predict changes in protein function, as H3N2 fusion activity was not affected, while H3N8 fusion activity drastically decreased. The fusion activity of H1N1 was also strongly affected by HHP. In all cases, HHP caused inactivation of the different influenza viruses. CONCLUSIONS HHP may be a useful tool for vaccine development, as it induces minor and reversible structural changes that may be associated with partial preservation of viral biological activities and may potentiate their immunogenic response while abolishing their infectivity. We also confirmed that, although pressure does not promote drastic changes in viral particle structure, it can distinctly affect viral fusion activity.
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Affiliation(s)
- Carlos Henrique Dumard
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - Shana P C Barroso
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - Ana Clara V Santos
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - Nathalia S Alves
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - José Nelson S S Couceiro
- Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil
| | - Andre M O Gomes
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - Patricia S Santos
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil
| | - Jerson L Silva
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil.
| | - Andréa C Oliveira
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-902, Brazil; Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Brazil.
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126
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Patra S, Anders C, Erwin N, Winter R. Osmolyte Effects on the Conformational Dynamics of a DNA Hairpin at Ambient and Extreme Environmental Conditions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701420] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Satyajit Patra
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Christian Anders
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Nelli Erwin
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Roland Winter
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
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127
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Patra S, Anders C, Erwin N, Winter R. Osmolyte Effects on the Conformational Dynamics of a DNA Hairpin at Ambient and Extreme Environmental Conditions. Angew Chem Int Ed Engl 2017; 56:5045-5049. [DOI: 10.1002/anie.201701420] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 03/03/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Satyajit Patra
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Christian Anders
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Nelli Erwin
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
| | - Roland Winter
- Physikalische Chemie I - Biophysikalische Chemie; Fakultät für Chemie und Chemische Biologie; TU Dortmund; Otto-Hahn Str. 4a 44227 Dortmund Germany
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128
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Schuabb C, Kumar N, Pataraia S, Marx D, Winter R. Pressure modulates the self-cleavage step of the hairpin ribozyme. Nat Commun 2017; 8:14661. [PMID: 28358002 PMCID: PMC5379106 DOI: 10.1038/ncomms14661] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 01/20/2017] [Indexed: 01/01/2023] Open
Abstract
The ability of certain RNAs, denoted as ribozymes, to not only store genetic information but also catalyse chemical reactions gave support to the RNA world hypothesis as a putative step in the development of early life on Earth. This, however, might have evolved under extreme environmental conditions, including the deep sea with pressures in the kbar regime. Here we study pressure-induced effects on the self-cleavage of hairpin ribozyme by following structural changes in real-time. Our results suggest that compression of the ribozyme leads to an accelerated transesterification reaction, being the self-cleavage step, although the overall process is retarded in the high-pressure regime. The results reveal that favourable interactions between the reaction site and neighbouring nucleobases are strengthened under pressure, resulting therefore in an accelerated self-cleavage step upon compression. These results suggest that properly engineered ribozymes may also act as piezophilic biocatalysts in addition to their hitherto known properties.
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Affiliation(s)
- Caroline Schuabb
- Physikalische Chemie I-Biophysikalische Chemie, Fakultät für Chemie und Chemische Biologie, TU Dortmund, Otto-Hahn-Strasse 4a, Dortmund 44227, Germany
| | - Narendra Kumar
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum 44780, Germany
| | - Salome Pataraia
- Physikalische Chemie I-Biophysikalische Chemie, Fakultät für Chemie und Chemische Biologie, TU Dortmund, Otto-Hahn-Strasse 4a, Dortmund 44227, Germany
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum 44780, Germany
| | - Roland Winter
- Physikalische Chemie I-Biophysikalische Chemie, Fakultät für Chemie und Chemische Biologie, TU Dortmund, Otto-Hahn-Strasse 4a, Dortmund 44227, Germany
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129
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Li R, Wang Y, Ling J, Liao X. Effects of high pressure processing on activity and structure of soluble acid invertase in mango pulp, crude extract, purified form and model systems. Food Chem 2017; 231:96-104. [PMID: 28450028 DOI: 10.1016/j.foodchem.2017.03.108] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 03/11/2017] [Accepted: 03/21/2017] [Indexed: 01/01/2023]
Abstract
The effects of high pressure processing (HPP) on the activity of soluble acid invertase (SAI) in mango pulp, crude extract, purified SAI and purified SAI in model systems (pectin, bovine serum albumin (BSA), sugars and pH 3-7) were investigated. The activity of SAI in mango pulp was increased after HPP, and that in crude extract stayed unchanged. The activity of purified SAI was decreased after HPP at 45 and 50°C. Pectin exhibited a concentration-dependent protection for purified SAI against HPP at 50°C/600MPa for 30min. Pectin that had an esterification degree (DE) of 85% exhibited a greater protection than pectin that had a DE of 20-34%. BSA, acidic pH (3-6) and sucrose also exhibited protection for purified SAI against HPP. HPP at 50°C/600MPa for 30min disrupted the secondary structure and tertiary structure of purified SAI, but no aggregation of purified SAI was observed after HPP.
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Affiliation(s)
- Renjie Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health; College of Food Science and Nutritional Engineering, China Agricultural University; Beijing Key Laboratory for Food Nonthermal Processing, Chinese National Engineering Research Centre for Fruit and Vegetable Processing; Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China.
| | - Yongtao Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health; College of Food Science and Nutritional Engineering, China Agricultural University; Beijing Key Laboratory for Food Nonthermal Processing, Chinese National Engineering Research Centre for Fruit and Vegetable Processing; Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China.
| | - Jiangang Ling
- Institute of Agricultural Products Processing, Ningbo Academy of Agricultural Sciences, Ningbo 315100, China.
| | - Xiaojun Liao
- Beijing Advanced Innovation Center for Food Nutrition and Human Health; College of Food Science and Nutritional Engineering, China Agricultural University; Beijing Key Laboratory for Food Nonthermal Processing, Chinese National Engineering Research Centre for Fruit and Vegetable Processing; Key Lab of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China.
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130
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Buckow R, Bingham J, Daglas S, Lowther S, Amos-Ritchie R, Middleton D. High pressure inactivation of selected avian viral pathogens in chicken meat homogenate. Food Control 2017. [DOI: 10.1016/j.foodcont.2016.08.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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131
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Cheng L, Sun DW, Zhu Z, Zhang Z. Effects of high pressure freezing (HPF) on denaturation of natural actomyosin extracted from prawn (Metapenaeus ensis). Food Chem 2017; 229:252-259. [PMID: 28372171 DOI: 10.1016/j.foodchem.2017.02.048] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 02/08/2017] [Accepted: 02/10/2017] [Indexed: 12/22/2022]
Abstract
Effects of protein denaturation caused by high pressure freezing, involving Pressure-Factors (pressure, time) and Freezing-Factors (temperature, phase transition, recrystallization, ice crystal types), are complicated. In the current study, the conformation and functional changes of natural actomyosin (NAM) under pressure assisted freezing (PAF, 100,150,300,400,500MPaP-20°C/25min), pressure shift freezing (PSF, 200MPaP-20°C/25min), and immersion freezing (0.1MPaP-20°C/5min) after pressure was released to 0.1MPa, as compared to normal immersion freezing process (IF, 0.1MPaP-20°C/30min). Results indicated that PSF (200MPaP-20°C/30min) could reduce the denaturation of frozen NAM and a pressure of 300MPa was the critical point to induce such a denaturation. During the periods of B→D in PSF or B→C→D in PAF, the generation and growth of ice crystals played an important role on changing the secondary and tertiary structure of the treated NAM.
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Affiliation(s)
- Lina Cheng
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Da-Wen Sun
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Food Refrigeration and Computerized Food Technology (FRCFT), University College Dublin, National University of Ireland, Agriculture and Food Science Centre, Belfield, Dublin 4, Ireland. http://www.ucd.ie/refrig,http://www.ucd.ie/sun
| | - Zhiwei Zhu
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China
| | - Zhihang Zhang
- Food Refrigeration and Computerized Food Technology (FRCFT), University College Dublin, National University of Ireland, Agriculture and Food Science Centre, Belfield, Dublin 4, Ireland
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132
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Lin YH, Song J, Forman-Kay JD, Chan HS. Random-phase-approximation theory for sequence-dependent, biologically functional liquid-liquid phase separation of intrinsically disordered proteins. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.09.090] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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133
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Ohto T, Hunger J, Backus EHG, Mizukami W, Bonn M, Nagata Y. Trimethylamine-N-oxide: its hydration structure, surface activity, and biological function, viewed by vibrational spectroscopy and molecular dynamics simulations. Phys Chem Chem Phys 2017; 19:6909-6920. [DOI: 10.1039/c6cp07284d] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Vibrational spectroscopy and molecular simulations revealed the hydrophilicity and hydrophobicity of TMAO in aqueous solution.
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Affiliation(s)
- Tatsuhiko Ohto
- Graduate School of Engineering Science
- Osaka University
- Toyonaka
- Japan
| | | | | | - Wataru Mizukami
- Department of Energy and Material Sciences
- Faculty of Engineering Sciences
- Kyushu University
- Fukuoka
- Japan
| | - Mischa Bonn
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
| | - Yuki Nagata
- Max Planck Institute for Polymer Research
- 55128 Mainz
- Germany
- Department of Theoretical and Computational Molecular Science
- Institute for Molecular Science
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134
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Gomes AT, Freire PC, Domingos CR, Neves MG, Cavaleiro JA, Almeida Paz FA, Saraiva JA, Tomé AC. Synthesis under high hydrostatic pressure — a new method to prepare 5,10,15,20-tetrakis[4-(substituted amino)-2,3,5,6-tetrafluorophenyl]porphyrins. J PORPHYR PHTHALOCYA 2016. [DOI: 10.1142/s108842461650111x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
5,10,15,20-Tetrakis(pentafluorophenyl)porphyrin reacts with primary alkylamines and heterocyclic amines, at 50°C and under high pressure (450 MPa), to produce the [Formula: see text]-substituted tetraamino derivatives in high yields. Under similar conditions, the reaction with the bulky dibutylamine and dipentylamine affords the corresponding mono-substituted dialkylaminoporphyrins in 10% yield. This new protocol arises as a considerable improvement of the methods already known, which usually require high temperatures and are not effective when using secondary amines having long alkyl groups.
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Affiliation(s)
- Ana T.P.C. Gomes
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Patrícia C. Freire
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Maria G.P.M.S. Neves
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
| | - José A.S. Cavaleiro
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Filipe A. Almeida Paz
- Department of Chemistry, CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Jorge A. Saraiva
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Augusto C. Tomé
- Department of Chemistry and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
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135
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Structural basis for the dissociation of α-synuclein fibrils triggered by pressure perturbation of the hydrophobic core. Sci Rep 2016; 6:37990. [PMID: 27901101 PMCID: PMC5128797 DOI: 10.1038/srep37990] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 11/04/2016] [Indexed: 12/18/2022] Open
Abstract
Parkinson’s disease is a neurological disease in which aggregated forms of the α-synuclein (α-syn) protein are found. We used high hydrostatic pressure (HHP) coupled with NMR spectroscopy to study the dissociation of α-syn fibril into monomers and evaluate their structural and dynamic properties. Different dynamic properties in the non-amyloid-β component (NAC), which constitutes the Greek-key hydrophobic core, and in the acidic C-terminal region of the protein were identified by HHP NMR spectroscopy. In addition, solid-state NMR revealed subtle differences in the HHP-disturbed fibril core, providing clues to how these species contribute to seeding α-syn aggregation. These findings show how pressure can populate so far undetected α-syn species, and they lay out a roadmap for fibril dissociation via pathways not previously observed using other approaches. Pressure perturbs the cavity-prone hydrophobic core of the fibrils by pushing water inward, thereby inducing the dissociation into monomers. Our study offers the molecular details of how hydrophobic interaction and the formation of water-excluded cavities jointly contribute to the assembly and stabilization of the fibrils. Understanding the molecular forces behind the formation of pathogenic fibrils uncovered by pressure perturbation will aid in the development of new therapeutics against Parkinson’s disease.
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136
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Krobath H, Chen T, Chan HS. Volumetric Physics of Polypeptide Coil–Helix Transitions. Biochemistry 2016; 55:6269-6281. [DOI: 10.1021/acs.biochem.6b00802] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Heinrich Krobath
- Departments of Biochemistry
and Molecular Genetics, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Tao Chen
- Departments of Biochemistry
and Molecular Genetics, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Hue Sun Chan
- Departments of Biochemistry
and Molecular Genetics, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
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137
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Chen G, Du H, Jiang B, Miao M, Feng B. Activity of Candida rugosa lipase for synthesis of hexyl octoate under high hydrostatic pressure and the mechanism of this reaction. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2017.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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138
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Zhao W, Liu D, Zhang Y. Study on the Influence of Pressure-Assisted Thermal Processing on PET/PE via the Change of Melting Enthalpy. J FOOD PROCESS PRES 2016. [DOI: 10.1111/jfpp.13135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wei Zhao
- School of Pharmacy and Bioengineering; Cheng Du University; Chengdu 610106 China
| | - Dayu Liu
- School of Pharmacy and Bioengineering; Cheng Du University; Chengdu 610106 China
| | - Yin Zhang
- A Key Laboratory of Meat Processing of Sichuan; Chengdu University; Chengdu 610106 China
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139
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Ingr M, Kutálková E, Hrnčiřík J, Lange R. Equilibria of oligomeric proteins under high pressure - A theoretical description. J Theor Biol 2016; 411:16-26. [PMID: 27717844 DOI: 10.1016/j.jtbi.2016.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 09/14/2016] [Accepted: 10/03/2016] [Indexed: 01/18/2023]
Abstract
High pressure methods have become a useful tool for studying protein structure and stability. Using them, various physico-chemical processes including protein unfolding, aggregation, oligomer dissociation or enzyme-activity decrease were studied on many different proteins. Oligomeric protein dissociation is a process that can perfectly utilize the potential of high-pressure techniques, as the high pressure shifts the equilibria to higher concentrations making them better observable by spectroscopic methods. This can be especially useful when the oligomeric form is highly stable at atmospheric pressure. These applications may be, however, hindered by less intensive experimental response as well as interference of the oligomerization equilibria with unfolding or aggregation of the subunits, but also by more complex theoretical description. In this study we develop mathematical models describing different kinds of oligomerization equilibria, both closed (equilibrium of monomer and the highest possible oligomer without any intermediates) and consecutive. Closed homooligomer equilibria are discussed for any oligomerization degree, while the more complex heterooligomer equilibria and the consecutive equilibria in both homo- and heterooligomers are taken into account only for dimers and trimers. In all the cases, fractions of all the relevant forms are evaluated as functions of pressure and concentration. Significant points (inflection points and extremes) of the resulting transition curves, that can be determined experimentally, are evaluated as functions of pressure and/or concentration. These functions can be further used in order to evaluate the thermodynamic parameters of the system, i.e. atmospheric-pressure equilibrium constants and volume changes of the individual steps of the oligomer-dissociation processes.
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Affiliation(s)
- Marek Ingr
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia; Charles University in Prague, Faculty of Science, Department of Biochemistry, Hlavova 2030, 12843 Prague 2, Czechia.
| | - Eva Kutálková
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia
| | - Josef Hrnčiřík
- Tomas Bata University in Zlín, Faculty of Technology, Department of Physics and Materials Engineering, nám. T. G. Masaryka 5555, 76001 Zlín, Czechia
| | - Reinhard Lange
- Université Montpellier, INRA UMR IATE, Biochimie et Technologie Alimentaires, cc023, Place Eugene Bataillon, 34095 Montpellier Cedex 05, France
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140
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Decaneto E, Suladze S, Rosin C, Havenith M, Lubitz W, Winter R. Pressure and Temperature Effects on the Activity and Structure of the Catalytic Domain of Human MT1-MMP. Biophys J 2016; 109:2371-81. [PMID: 26636948 DOI: 10.1016/j.bpj.2015.10.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 10/12/2015] [Accepted: 10/19/2015] [Indexed: 11/19/2022] Open
Abstract
Membrane type 1-matrix metalloproteinase (MT1-MMP or MMP-14) is a zinc-transmembrane metalloprotease involved in the degradation of extracellular matrix and tumor invasion. While changes in solvation of MT1-MMP have been recently studied, little is known about the structural and energetic changes associated with MT1-MMP while interacting with substrates. Steady-state kinetic and thermodynamic data (including activation energies and activation volumes) were measured over a wide range of temperatures and pressures by means of a stopped-flow fluorescence technique. Complementary temperature- and pressure-dependent Fourier-transform infrared measurements provided corresponding structural information of the protein. MT1-MMP is stable and active over a wide range of temperatures (10-55 °C). A small conformational change was detected at 37 °C, which is responsible for the change in activity observed at the same temperature. Pressure decreases the enzymatic activity until complete inactivation occurs at 2 kbar. The inactivation is associated with changes in the rate-limiting step of the reaction caused by additional hydration of the active site upon compression and/or minor conformational changes in the active site region. Based on these data, an energy and volume diagram could be established for the various steps of the enzymatic reaction.
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Affiliation(s)
- Elena Decaneto
- Max Planck Institute for Chemical Energy Conversion, Mülheim a. d. Ruhr, Germany; Department of Physical Chemistry II, Ruhr-University Bochum, Bochum, Germany
| | - Saba Suladze
- Department of Chemistry and Chemical Biology, Physical Chemistry, Technische Universität Dortmund, Dortmund, Germany
| | - Christopher Rosin
- Department of Chemistry and Chemical Biology, Physical Chemistry, Technische Universität Dortmund, Dortmund, Germany
| | - Martina Havenith
- Department of Physical Chemistry II, Ruhr-University Bochum, Bochum, Germany
| | - Wolfgang Lubitz
- Max Planck Institute for Chemical Energy Conversion, Mülheim a. d. Ruhr, Germany
| | - Roland Winter
- Department of Chemistry and Chemical Biology, Physical Chemistry, Technische Universität Dortmund, Dortmund, Germany.
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141
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Cino EA, Soares IN, Pedrote MM, de Oliveira GAP, Silva JL. Aggregation tendencies in the p53 family are modulated by backbone hydrogen bonds. Sci Rep 2016; 6:32535. [PMID: 27600721 PMCID: PMC5013286 DOI: 10.1038/srep32535] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 08/10/2016] [Indexed: 11/23/2022] Open
Abstract
The p53 family of proteins is comprised of p53, p63 and p73. Because the p53 DNA binding domain (DBD) is naturally unstable and possesses an amyloidogenic sequence, it is prone to form amyloid fibrils, causing loss of functions. To develop p53 therapies, it is necessary to understand the molecular basis of p53 instability and aggregation. Light scattering, thioflavin T (ThT) and high hydrostatic pressure (HHP) assays showed that p53 DBD aggregates faster and to a greater extent than p63 and p73 DBDs, and was more susceptible to denaturation. The aggregation tendencies of p53, p63, and p73 DBDs were strongly correlated with their thermal stabilities. Molecular Dynamics (MD) simulations indicated specific regions of structural heterogeneity unique to p53, which may be promoted by elevated incidence of exposed backbone hydrogen bonds (BHBs). The results indicate regions of structural vulnerability in the p53 DBD, suggesting new targetable sites for modulating p53 stability and aggregation, a potential approach to cancer therapy.
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Affiliation(s)
- Elio A Cino
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, RJ, Brazil
| | - Iaci N Soares
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, RJ, Brazil
| | - Murilo M Pedrote
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, RJ, Brazil
| | - Guilherme A P de Oliveira
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, RJ, Brazil
| | - Jerson L Silva
- Programa de Biologia Estrutural, Instituto de Bioquímica Médica Leopoldo de Meis, Instituto Nacional de Biologia Estrutural e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-902, RJ, Brazil
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142
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143
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Schummel PH, Haag A, Kremer W, Kalbitzer HR, Winter R. Cosolvent and Crowding Effects on the Temperature and Pressure Dependent Conformational Dynamics and Stability of Globular Actin. J Phys Chem B 2016; 120:6575-86. [DOI: 10.1021/acs.jpcb.6b04738] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Paul Hendrik Schummel
- Physical
Chemistry I − Biophysical Chemistry, Faculty of Chemistry and
Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, D-44227 Dortmund, Germany
| | - Andreas Haag
- Institute
of Biophysics and Physical Biochemistry, Centre of Magnetic Resonance
in Chemistry and Biomedicine (CMRCB), University of Regensburg, Universitätsstrasse
31, D-93047 Regensburg, Germany
| | - Werner Kremer
- Institute
of Biophysics and Physical Biochemistry, Centre of Magnetic Resonance
in Chemistry and Biomedicine (CMRCB), University of Regensburg, Universitätsstrasse
31, D-93047 Regensburg, Germany
| | - Hans Robert Kalbitzer
- Institute
of Biophysics and Physical Biochemistry, Centre of Magnetic Resonance
in Chemistry and Biomedicine (CMRCB), University of Regensburg, Universitätsstrasse
31, D-93047 Regensburg, Germany
| | - Roland Winter
- Physical
Chemistry I − Biophysical Chemistry, Faculty of Chemistry and
Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, D-44227 Dortmund, Germany
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144
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Wei G, Xi W, Nussinov R, Ma B. Protein Ensembles: How Does Nature Harness Thermodynamic Fluctuations for Life? The Diverse Functional Roles of Conformational Ensembles in the Cell. Chem Rev 2016; 116:6516-51. [PMID: 26807783 PMCID: PMC6407618 DOI: 10.1021/acs.chemrev.5b00562] [Citation(s) in RCA: 253] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
All soluble proteins populate conformational ensembles that together constitute the native state. Their fluctuations in water are intrinsic thermodynamic phenomena, and the distributions of the states on the energy landscape are determined by statistical thermodynamics; however, they are optimized to perform their biological functions. In this review we briefly describe advances in free energy landscape studies of protein conformational ensembles. Experimental (nuclear magnetic resonance, small-angle X-ray scattering, single-molecule spectroscopy, and cryo-electron microscopy) and computational (replica-exchange molecular dynamics, metadynamics, and Markov state models) approaches have made great progress in recent years. These address the challenging characterization of the highly flexible and heterogeneous protein ensembles. We focus on structural aspects of protein conformational distributions, from collective motions of single- and multi-domain proteins, intrinsically disordered proteins, to multiprotein complexes. Importantly, we highlight recent studies that illustrate functional adjustment of protein conformational ensembles in the crowded cellular environment. We center on the role of the ensemble in recognition of small- and macro-molecules (protein and RNA/DNA) and emphasize emerging concepts of protein dynamics in enzyme catalysis. Overall, protein ensembles link fundamental physicochemical principles and protein behavior and the cellular network and its regulation.
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Affiliation(s)
- Guanghong Wei
- State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences (MOE), and Department of Physics, Fudan University, Shanghai, P. R. China
| | - Wenhui Xi
- State Key Laboratory of Surface Physics, Key Laboratory for Computational Physical Sciences (MOE), and Department of Physics, Fudan University, Shanghai, P. R. China
| | - Ruth Nussinov
- Basic Science Program, Leidos Biomedical Research, Inc. Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702, USA
- Sackler Inst. of Molecular Medicine Department of Human Genetics and Molecular Medicine Sackler School of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
| | - Buyong Ma
- Basic Science Program, Leidos Biomedical Research, Inc. Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702, USA
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145
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Exploring the stability limits of actin and its suprastructures. Biophys J 2016; 107:2982-2992. [PMID: 25517163 DOI: 10.1016/j.bpj.2014.11.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 10/28/2014] [Accepted: 11/05/2014] [Indexed: 12/30/2022] Open
Abstract
Actin is the main component of the microfilament system in eukaryotic cells and can be found in distinct morphological states. Global (G)-actin is able to assemble into highly organized, supramolecular cellular structures known as filamentous (F)-actin and bundled (B)-actin. To evaluate the structure and stability of G-, F-, and B-actin over a wide range of temperatures and pressures, we used Fourier transform infrared spectroscopy in combination with differential scanning and pressure perturbation calorimetry, small-angle x-ray scattering, laser confocal scanning microscopy, and transmission electron microscopy. Our analysis was designed to provide new (to our knowledge) insights into the stabilizing forces of actin self-assembly and to reveal the stability of the actin polymorphs, including in conditions encountered in extreme environments. In addition, we sought to explain the limited pressure stability of actin self-assembly observed in vivo. G-actin is not only the least temperature-stable but also the least pressure-stable actin species. Under abyssal conditions, where temperatures as low as 1-4°C and pressures up to 1 kbar are reached, G-actin is hardly stable. However, the supramolecular assemblies of actin are stable enough to withstand the extreme conditions usually encountered on Earth. Beyond ∼3-4 kbar, filamentous structures disassemble, and beyond ∼4 kbar, complete dissociation of F-actin structures is observed. Between ∼1 and 2 kbar, some disordering of actin assemblies commences, in agreement with in vivo observations. The limited pressure stability of the monomeric building block seems to be responsible for the suppression of actin assembly in the kbar pressure range.
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146
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Savadkoohi S, Kasapis S. High pressure effects on the structural functionality of condensed globular-protein matrices. Int J Biol Macromol 2016; 88:433-42. [PMID: 27060534 DOI: 10.1016/j.ijbiomac.2016.04.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 04/05/2016] [Accepted: 04/05/2016] [Indexed: 11/26/2022]
Abstract
High pressure technology is the outcome of consumer demand for better quality control of processed foods. There is great potential to apply HPP to condensed systems of globular proteins for the generation of industry-relevant biomaterials with advanced techno- and biofunctionality. To this end, research demonstrates that application of high hydrostatic pressure generates a coherent structure and preserves the native conformation in condensed globular proteins, which is an entirely unexpected but interesting outcome on both scientific and technological grounds. In microbiological challenge tests, high pressure at conventional commercial conditions, demonstrated to effectively reduce the concentration of typical Gram negative or Gram positive foodborne pathogens, and proteolytic enzymes in high-solid protein samples. This may have industrial significance in relation to the formulation and stabilisation of "functional food" products as well as in protein ingredients and concentrates by replacing spray dried powders with condensed HPP-treated pastes that maintain structure and bioactivity. Fundamental concepts and structural functionality of condensed matrices of globular proteins are the primary interest in this mini-review, which may lead to opportunities for industrial exploitation, but earlier work on low-solid systems is also summarised presently to put recent developments in context of this rapidly growing field.
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Affiliation(s)
- Sobhan Savadkoohi
- School of Science, RMIT University, Bundoora West Campus, Plenty Road, Vic 3083, Australia
| | - Stefan Kasapis
- School of Science, RMIT University, Bundoora West Campus, Plenty Road, Vic 3083, Australia.
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147
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Lemaire B, Mignolet E, Debier C, Calderon PB, Thomé JP, Rees JF. High hydrostatic pressure influences the in vitro response to xenobiotics in Dicentrarchus labrax liver. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2016; 173:43-52. [PMID: 26836508 DOI: 10.1016/j.aquatox.2016.01.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 01/04/2016] [Accepted: 01/09/2016] [Indexed: 06/05/2023]
Abstract
Hydrostatic pressure (HP) increases by about 1 atmosphere (0.1MPa) for each ten-meter depth increase in the water column. This thermodynamical parameter could well influence the response to and effects of xenobiotics in the deep-sea biota, but this possibility remains largely overlooked. To grasp the extent of HP adaptation in deep-sea fish, comparative studies with living cells of surface species exposed to chemicals at high HP are required. We initially conducted experiments with precision-cut liver slices of a deep-sea fish (Coryphaenoides rupestris), co-exposed for 15h to the aryl hydrocarbon receptor (AhR) agonist 3-methylcholanthrene at HP levels representative of the surface (0.1MPa) and deep-sea (5-15MPa; i.e., 500-1500m depth) environments. The transcript levels of a suite of stress-responsive genes, such as the AhR battery CYP1A, were subsequently measured (Lemaire et al., 2012; Environ. Sci. Technol. 46, 10310-10316). Strikingly, the AhR agonist-mediated increase of CYP1A mRNA content was pressure-dependently reduced in C. rupestris. Here, the same co-exposure scenario was applied for 6 or 15h to liver slices of a surface fish, Dicentrarchus labrax, a coastal species presumably not adapted to high HP. Precision-cut liver slices of D. labrax were also used in 1h co-exposure studies with the pro-oxidant tert-butylhydroperoxide (tBHP) as to investigate the pressure-dependence of the oxidative stress response (i.e., reactive oxygen production, glutathione and lipid peroxidation status). Liver cells remained viable in all experiments (adenosine triphosphate content). High HP precluded the AhR agonist-mediated increase of CYP1A mRNA expression in D. labrax, as well as that of glutathione peroxidase, and significantly reduced that of heat shock protein 70. High HP (1h) also tended per se to increase the level of oxidative stress in liver cells of the surface fish. Trends to an increased resistance to tBHP were also noted. Whether the latter observation truly reflects a protective response to oxidative stress will be addressed in future co-exposure studies with both surface and deep-sea fish liver cells, using additional pro-oxidant chemicals. Altogether, data on CYP1A inducibility with D. labrax and C. rupestris support the view that high HP represses AhR signaling in marine fishes, and that only species adapted to thrive in the deep-sea have evolved the molecular adaptations necessary to counteract to some extent this inhibition.
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Affiliation(s)
- Benjamin Lemaire
- Institut des Sciences de la Vie, Université Catholique de Louvain, Croix du Sud 2, B-1348 Louvain-la-Neuve, Belgium
| | - Eric Mignolet
- Institut des Sciences de la Vie, Université Catholique de Louvain, Croix du Sud 2, B-1348 Louvain-la-Neuve, Belgium
| | - Cathy Debier
- Institut des Sciences de la Vie, Université Catholique de Louvain, Croix du Sud 2, B-1348 Louvain-la-Neuve, Belgium
| | - Pedro Buc Calderon
- Louvain Drug Research Institute, Université Catholique de Louvain, Avenue Mounier 73, B-1200 Woluwé-Saint-Lambert, Belgium
| | - Jean Pierre Thomé
- Laboratoire d'Ecologie Animale et Ecotoxicologie, Université de Liège, Allée du 6 août 15, B-4000 Liège, Belgium
| | - Jean François Rees
- Institut des Sciences de la Vie, Université Catholique de Louvain, Croix du Sud 2, B-1348 Louvain-la-Neuve, Belgium.
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148
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Luong TQ, Kapoor S, Winter R. Pressure-A Gateway to Fundamental Insights into Protein Solvation, Dynamics, and Function. Chemphyschem 2015; 16:3555-71. [DOI: 10.1002/cphc.201500669] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Indexed: 01/11/2023]
Affiliation(s)
- Trung Quan Luong
- Department of Chemistry and Chemical Biology, Physical Chemistry; TU Dortmund University, Dortmund; Otto-Hahn-Str. 6 d-44221 Dortmund Germany
| | - Shobhna Kapoor
- Department of Chemistry and Chemical Biology, Physical Chemistry; TU Dortmund University, Dortmund; Otto-Hahn-Str. 6 d-44221 Dortmund Germany
| | - Roland Winter
- Department of Chemistry and Chemical Biology, Physical Chemistry; TU Dortmund University, Dortmund; Otto-Hahn-Str. 6 d-44221 Dortmund Germany
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149
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Barroso SPC, Nico D, Nascimento D, Santos ACV, Couceiro JNSS, Bozza FA, Ferreira AMA, Ferreira DF, Palatnik-de-Sousa CB, Souza TML, Gomes AMO, Silva JL, Oliveira AC. Intranasal Immunization with Pressure Inactivated Avian Influenza Elicits Cellular and Humoral Responses in Mice. PLoS One 2015; 10:e0128785. [PMID: 26056825 PMCID: PMC4461174 DOI: 10.1371/journal.pone.0128785] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 04/30/2015] [Indexed: 01/19/2023] Open
Abstract
Influenza viruses pose a serious global health threat, particularly in light of newly emerging strains, such as the avian influenza H5N1 and H7N9 viruses. Vaccination remains the primary method for preventing acquiring influenza or for avoiding developing serious complications related to the disease. Vaccinations based on inactivated split virus vaccines or on chemically inactivated whole virus have some important drawbacks, including changes in the immunogenic properties of the virus. To induce a greater mucosal immune response, intranasally administered vaccines are highly desired as they not only prevent disease but can also block the infection at its primary site. To avoid these drawbacks, hydrostatic pressure has been used as a potential method for viral inactivation and vaccine production. In this study, we show that hydrostatic pressure inactivates the avian influenza A H3N8 virus, while still maintaining hemagglutinin and neuraminidase functionalities. Challenged vaccinated animals showed no disease signs (ruffled fur, lethargy, weight loss, and huddling). Similarly, these animals showed less Evans Blue dye leakage and lower cell counts in their bronchoalveolar lavage fluid compared with the challenged non-vaccinated group. We found that the whole inactivated particles were capable of generating a neutralizing antibody response in serum, and IgA was also found in nasal mucosa and feces. After the vaccination and challenge we observed Th1/Th2 cytokine secretion with a prevalence of IFN-γ. Our data indicate that the animals present a satisfactory immune response after vaccination and are protected against infection. Our results may pave the way for the development of a novel pressure-based vaccine against influenza virus.
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Affiliation(s)
- Shana P. C. Barroso
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941–902, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
- Laboratório de Vírus Respiratórios, WHO/NIC, Instituto Oswaldo Cruz/FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Dirlei Nico
- Instituto de Microbiologia Paulo Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941–590, Brazil
| | - Danielle Nascimento
- Fundação de Pesquisa Clínica Evandro Chagas, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Clara V. Santos
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941–902, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
| | - José Nelson S. S. Couceiro
- Instituto de Microbiologia Paulo Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941–590, Brazil
| | - Fernando A. Bozza
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
- Fundação de Pesquisa Clínica Evandro Chagas, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana M. A. Ferreira
- Instituto de Microbiologia Paulo Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941–590, Brazil
| | - Davis F. Ferreira
- Instituto de Microbiologia Paulo Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941–590, Brazil
| | - Clarisa B. Palatnik-de-Sousa
- Instituto de Microbiologia Paulo Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro 21941–590, Brazil
| | - Thiago Moreno L. Souza
- Laboratório de Vírus Respiratórios, WHO/NIC, Instituto Oswaldo Cruz/FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Andre M. O. Gomes
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941–902, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
| | - Jerson L. Silva
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941–902, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
| | - Andréa C. Oliveira
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, 21941–902, Brazil
- Instituto Nacional de Ciência e Tecnologia de Biologia Estrutural e Bioimagem, Rio de Janeiro, Brazil
- * E-mail:
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150
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A hypothesis to reconcile the physical and chemical unfolding of proteins. Proc Natl Acad Sci U S A 2015; 112:E2775-84. [PMID: 25964355 DOI: 10.1073/pnas.1500352112] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
High pressure (HP) or urea is commonly used to disturb folding species. Pressure favors the reversible unfolding of proteins by causing changes in the volumetric properties of the protein-solvent system. However, no mechanistic model has fully elucidated the effects of urea on structure unfolding, even though protein-urea interactions are considered to be crucial. Here, we provide NMR spectroscopy and 3D reconstructions from X-ray scattering to develop the "push-and-pull" hypothesis, which helps to explain the initial mechanism of chemical unfolding in light of the physical events triggered by HP. In studying MpNep2 from Moniliophthora perniciosa, we tracked two cooperative units using HP-NMR as MpNep2 moved uphill in the energy landscape; this process contrasts with the overall structural unfolding that occurs upon reaching a threshold concentration of urea. At subdenaturing concentrations of urea, we were able to trap a state in which urea is preferentially bound to the protein (as determined by NMR intensities and chemical shifts); this state is still folded and not additionally exposed to solvent [fluorescence and small-angle X-ray scattering (SAXS)]. This state has a higher susceptibility to pressure denaturation (lower p1/2 and larger ΔVu); thus, urea and HP share concomitant effects of urea binding and pulling and water-inducing pushing, respectively. These observations explain the differences between the molecular mechanisms that control the physical and chemical unfolding of proteins, thus opening up new possibilities for the study of protein folding and providing an interpretation of the nature of cooperativity in the folding and unfolding processes.
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