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Ludwig N, Galindo C, Witjaksono C, Danvin A, Peaupardin P, Muller D, Kusumoto T, Kodaira S, Barillon R, Raffy Q. Radiolysis of myoglobin concentrated gels by protons: specific changes in secondary structure and production of carbon monoxide. Sci Rep 2024; 14:8625. [PMID: 38616193 PMCID: PMC11016545 DOI: 10.1038/s41598-024-58378-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 03/28/2024] [Indexed: 04/16/2024] Open
Abstract
While particle therapy has been used for decades for cancer treatment, there is still a lack of information on the molecular mechanisms of biomolecules radiolysis by accelerated ions. Here, we examine the effects of accelerated protons on highly concentrated native myoglobin, by means of Fourier transform infrared and UV-Visible spectroscopies. Upon irradiation, the secondary structure of the protein is drastically modified, from mostly alpha helices conformation to mostly beta elements at highest fluence. These changes are accompanied by significant production of carbon monoxide, which was shown to come from heme degradation under irradiation. The radiolytic yields of formation of denatured protein, carbon monoxide, and of heme degradation were determined, and found very close to each other: G+denatured Mb ≈ G+CO ≈ G-heme = 1.6 × 10-8 ± 0.1 × 10-8 mol/J = 0.16 ± 0.01 species/100 eV. The denaturation of the protein to a beta structure and the production of carbon monoxide under ion irradiation are phenomena that may play an important role in the biological effects of ionizing radiation.
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Affiliation(s)
- Nicolas Ludwig
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
- Aerial, Parc D'innovation, 250 Rue Laurent Fries, F-67400, Illkirch, France
| | - Catherine Galindo
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
| | - Clea Witjaksono
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
- Institut de Chimie, UMR 7177, Université de Strasbourg and CNRS, 4 rue Blaise Pascal, F-67070, Strasbourg, France
| | - Antoine Danvin
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
| | - Philippe Peaupardin
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
| | - Dominique Muller
- ICube, UMR7357, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
| | - Tamon Kusumoto
- National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Satoshi Kodaira
- National Institutes for Quantum and Radiological Science and Technology (QST), 4-9-1 Anagawa, Inage-ku, Chiba, 263-8555, Japan
| | - Rémi Barillon
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France
| | - Quentin Raffy
- IPHC, UMR 7178, Université de Strasbourg and CNRS, 23 rue du Loess, F-67037, Strasbourg, France.
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2
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Ng YK, Konermann L. Mechanism of Protein Aggregation Inhibition by Arginine: Blockage of Anionic Side Chains Favors Unproductive Encounter Complexes. J Am Chem Soc 2024; 146:8394-8406. [PMID: 38477601 DOI: 10.1021/jacs.3c14180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
Aggregation refers to the assembly of proteins into nonphysiological higher order structures. While amyloid has been studied extensively, much less is known about amorphous aggregation, a process that interferes with protein expression and storage. Free arginine (Arg+) is a widely used aggregation inhibitor, but its mechanism remains elusive. Focusing on myoglobin (Mb), we recently applied atomistic molecular dynamics (MD) simulations for gaining detailed insights into amorphous aggregation (Ng J. Phys. Chem. B 2021, 125, 13099). Building on that approach, the current work for the first time demonstrates that MD simulations can directly elucidate aggregation inhibition mechanisms. Comparative simulations with and without Arg+ reproduced the experimental finding that Arg+ significantly decreased the Mb aggregation propensity. Our data reveal that, without Arg+, protein-protein encounter complexes readily form salt bridges and hydrophobic contacts, culminating in firmly linked dimeric aggregation nuclei. Arg+ promotes the dissociation of encounter complexes. These "unproductive" encounter complexes are favored because Arg+ binding to D- and E- lowers the tendency of these anionic residues to form interprotein salt bridges. Side chain blockage is mediated largely by the guanidinium group of Arg+, which binds carboxylates through H-bond-reinforced ionic contacts. Our MD data revealed Arg+ self-association into a dynamic quasi-infinite network, but we found no evidence that this self-association is important for protein aggregation inhibition. Instead, aggregation inhibition by Arg+ is similar to that mediated by free guanidinium ions. The computational strategy used here should be suitable for the rational design of aggregation inhibitors with enhanced potency.
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Affiliation(s)
- Yuen Ki Ng
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Lars Konermann
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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3
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Ausili A. Despite their structural similarities, the cytosolic isoforms of human Hsp90 show different behaviour in thermal unfolding due to their conformation: An FTIR study. Arch Biochem Biophys 2023; 740:109599. [PMID: 37028636 DOI: 10.1016/j.abb.2023.109599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 03/16/2023] [Accepted: 04/05/2023] [Indexed: 04/09/2023]
Abstract
Heat shock proteins 90 (Hsp90) are chaperones that promote the proper folding of other proteins under high temperature stress situations. Hsp90s are highly conserved and ubiquitous proteins, and in mammalian cells, they are localized in the cytoplasm, endoplasmic reticulum, and mitochondria. Cytoplasmic Hsp90 are named Hsp90α and Hsp90β and differ mainly in their expression pattern: Hsp90α is expressed under stress conditions, while Hsp90β is a constitutive protein. Structurally, both share the same characteristics by presenting three well-conserved domains, one of which, the N-terminal domain, has a binding site for ATP to which various drugs targeting this protein, including radicicol, can bind. The protein is mainly found in dimeric form and adopts different conformations depending on the presence of ligands, co-chaperones and client proteins. In this study, some aspects of structure and thermal unfolding of cytoplasmic human Hsp90 were analysed by infrared spectroscopy. The effect on Hsp90β of binding with a non-hydrolysable ATP analogue and radicicol was also examined. The results obtained showed that despite the high similarity in secondary structure the two isoforms exhibit substantial differences in their behaviour during thermal unfolding, as Hsp90α exhibits higher thermal stability, slower denaturation process and different event sequence during unfolding. Ligand binding strongly stabilizes Hsp90β and slightly modifies the secondary structure of the protein as well. Most likely, these structural and thermostability characteristics are closely related to the conformational cycling of the chaperone and its propensity to exist in monomer or dimer form.
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Affiliation(s)
- Alessio Ausili
- Institute of Plant Biochemistry and Photosynthesis (IBVF), Consejo Superior de Investigaciones Científicas, 41092, Seville, Spain.
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4
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Chotigavin N, Kerr WL, Klaypradit W, Kerdpiboon S. Novel sous-vide pressure technique affecting properties of local beef muscle. Lebensm Wiss Technol 2023. [DOI: 10.1016/j.lwt.2023.114439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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5
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A combination of alkaline pH-shifting/acidic pH and thermal treatments improves the solubility and emulsification properties of wheat glutenin. Food Chem 2022; 393:133358. [PMID: 35661594 DOI: 10.1016/j.foodchem.2022.133358] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 05/24/2022] [Accepted: 05/29/2022] [Indexed: 11/21/2022]
Abstract
Glutenin has limited applicability in food industry due to poor water solubility and emulsifying properties. In this study, the physicochemical properties of glutenin were improved by combined treatments of alkaline pH-shifting or acidic pH with heating. The surface morphology, structure and physicochemical properties were measured during the modification process of glutenin. Results showed that the smaller square clusters and regular tubular fibrils were observed in modified glutenin and the α-helix proportion of the treated glutenin was finally increased to 59.90 ± 0.01%. Compared with untreated glutenin, the combined treatments of pH-shifting with heating as well as fibrillation process increased the solubility of glutenin by 21.3 and 3.5 times, respectively. Moreover, the treated glutenin showed excellent emulsifying stability (EAI: 50.84 ± 0.51 m2g-1) and thermal stability (peak temperature increased from 109.58 to 149.05 °C). This study provides an informative basis for improving the physicochemical and functional properties of glutenin.
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6
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Biomolecules under Pressure: Phase Diagrams, Volume Changes, and High Pressure Spectroscopic Techniques. Int J Mol Sci 2022; 23:ijms23105761. [PMID: 35628571 PMCID: PMC9144967 DOI: 10.3390/ijms23105761] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/18/2022] [Accepted: 05/19/2022] [Indexed: 02/06/2023] Open
Abstract
Pressure is an equally important thermodynamical parameter as temperature. However, its importance is often overlooked in the biophysical and biochemical investigations of biomolecules and biological systems. This review focuses on the application of high pressure (>100 MPa = 1 kbar) in biology. Studies of high pressure can give insight into the volumetric aspects of various biological systems; this information cannot be obtained otherwise. High-pressure treatment is a potentially useful alternative method to heat-treatment in food science. Elevated pressure (up to 120 MPa) is present in the deep sea, which is a considerable part of the biosphere. From a basic scientific point of view, the application of the gamut of modern spectroscopic techniques provides information about the conformational changes of biomolecules, fluctuations, and flexibility. This paper reviews first the thermodynamic aspects of pressure science, the important parameters affecting the volume of a molecule. The technical aspects of high pressure production are briefly mentioned, and the most common high-pressure-compatible spectroscopic techniques are also discussed. The last part of this paper deals with the main biomolecules, lipids, proteins, and nucleic acids: how they are affected by pressure and what information can be gained about them using pressure. I I also briefly mention a few supramolecular structures such as viruses and bacteria. Finally, a subjective view of the most promising directions of high pressure bioscience is outlined.
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7
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Ng YK, Tajoddin NN, Scrosati PM, Konermann L. Mechanism of Thermal Protein Aggregation: Experiments and Molecular Dynamics Simulations on the High-Temperature Behavior of Myoglobin. J Phys Chem B 2021; 125:13099-13110. [PMID: 34808050 DOI: 10.1021/acs.jpcb.1c07210] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Proteins that encounter unfavorable solvent conditions are prone to aggregation, a phenomenon that remains poorly understood. This work focuses on myoglobin (Mb) as a model protein. Upon heating, Mb produces amorphous aggregates. Thermal unfolding experiments at low concentration (where aggregation is negligible), along with centrifugation assays, imply that Mb aggregation proceeds via globally unfolded conformers. This contrasts studies on other proteins that emphasized the role of partially folded structures as aggregate precursors. Molecular dynamics (MD) simulations were performed to gain insights into the mechanism by which heat-unfolded Mb molecules associate with one another. A prerequisite for these simulations was the development of a method for generating monomeric starting structures. Periodic boundary condition artifacts necessitated the implementation of a partially immobilized water layer lining the walls of the simulation box. Aggregation simulations were performed at 370 K to track the assembly of monomeric Mb into pentameric species. Binding events were preceded by multiple unsuccessful encounters. Even after association, protein-protein contacts remained in flux. Binding was mediated by hydrophobic contacts, along with salt bridges that involved hydrophobically embedded Lys residues. Overall, this work illustrates that atomistic MD simulations are well suited for garnering insights into protein aggregation mechanisms.
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Affiliation(s)
- Yuen Ki Ng
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Nastaran N Tajoddin
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Pablo M Scrosati
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Lars Konermann
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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8
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Anselmo S, Cataldo S, Avola T, Sancataldo G, D'Oca MC, Fiore T, Muratore N, Scopelliti M, Pettignano A, Vetri V. Lead(II) ions adsorption onto amyloid particulates: An in depth study. J Colloid Interface Sci 2021; 610:347-358. [PMID: 34923272 DOI: 10.1016/j.jcis.2021.11.184] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 11/24/2021] [Accepted: 11/28/2021] [Indexed: 01/08/2023]
Abstract
The production of new cost-effective biocompatible sorbent sustainable materials, with natural origins, able to remove heavy metals from water resources is nowadays highly desirable in order to reduce pollution and increase clean water availability. In this context, self-assembled protein materials with amyloid structures seem to have a great potential as natural platform for a broader development of highly-tunable structures. In this work we show how protein particulates, a generic form of protein aggregates, with spherical micro sized shape can be used as adsorbents of Pb2+ ions from aqueous solution. The effect of pH, ionic medium, ionic strength and temperature of the metal ion solution on the adsorption ability and affinity has been evaluated revealing the complexity of adsorption mechanisms which are the result of the balance of specific interactions with functional groups in protein structure and not specific ones common to all polypeptide chains, and possibly related to amyloid state and to modification of particulates hydration layer.
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Affiliation(s)
- Sara Anselmo
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Salvatore Cataldo
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Tiziana Avola
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Giuseppe Sancataldo
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Maria Cristina D'Oca
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Tiziana Fiore
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Nicola Muratore
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Michelangelo Scopelliti
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy
| | - Alberto Pettignano
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy.
| | - Valeria Vetri
- Dipartimento di Fisica e Chimica - Emilio Segrè, Università di Palermo, Viale delle Scienze, Palermo I-90128, Italy.
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9
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Liu H, Li Q, Zhao D, Zhang M, Jiang S, Li C. Changes in the structure and digestibility of myoglobin treated with sodium chloride. Food Chem 2021; 363:130284. [PMID: 34120050 DOI: 10.1016/j.foodchem.2021.130284] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 06/01/2021] [Accepted: 06/01/2021] [Indexed: 10/21/2022]
Abstract
Myoglobin is a protein not easily broken down by digestive enzymes due to its rigid structure. This study evaluated the structural characteristics of myoglobin under various sodium chloride treatments (0.4-0.8 mol/L for 5-10 h) and the impacts on its digestibility using spectroscopic and molecular dynamics simulation techniques. Myoglobin digestibility was 40% following pepsin digestion and 60% after being sequentially digested by pepsin and trypsin. The α-helix content of myoglobin did not change significantly following sodium chloride treatment but hydrophobic amino acids were exposed and the binding of phenylalanine targeted by some digestive enzymes became more stable, leading to the reduced digestibility.
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Affiliation(s)
- Hui Liu
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Qian Li
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Di Zhao
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Miao Zhang
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Shuai Jiang
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Chunbao Li
- Key Laboratory of Meat Processing and Quality Control, MOE, Key Laboratory of Meat Processing, MARA, Jiangsu Collaborative Innovation Center of Meat Production, Processing and Quality Control; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
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10
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Trypsin activity and freeze-thaw stability in the presence of ions and non-ionic surfactants. J Biosci Bioeng 2020; 131:234-240. [PMID: 33189544 DOI: 10.1016/j.jbiosc.2020.10.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 10/22/2020] [Accepted: 10/25/2020] [Indexed: 01/05/2023]
Abstract
Trypsin is a serine protease with important applications such as protein sequencing and tissue dissociation. Preserving protein structure and its activity during freeze-thawing and prolonging its shelf life is one of the most interesting tasks in biochemistry. In the present study, trypsin cryoprotection was achieved by altering buffer composition. Sodium phosphate buffer at pH 8.0 led to pH shift-induced destabilization of trypsin and formation of a molten globule, followed by significant activity loss (about 70%). Potassium phosphate and ammonium bicarbonate buffers at pH 8.0 were used with up to 90% activity recovery rate after 7 freeze-thaw cycles. The addition of non-ionic surfactants Tween 20 and Tween 80 led to up to 99% activity recovery rate. Amide I region changes, corresponding to specific secondary structures in the Fourier transform infrared (FTIR) spectrum, were modest in the case of Tween 20 and Tween 80. On the other hand, the addition of Triton X-100 led to the destabilization of α-helicoidal segments of trypsin structure after 7 freeze-thaw cycles but also increased protein substrate availability.
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11
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Dhakal S, Shafaat H, Balasubramaniam VM. Thermal and high‐pressure treatment stability of egg‐white avidin in aqueous solution. J FOOD PROCESS ENG 2020. [DOI: 10.1111/jfpe.13481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Santosh Dhakal
- Department of Food Science & TechnologyThe Ohio State University Columbus Ohio USA
| | - Hannah Shafaat
- Department of Chemistry and BiochemistryThe Ohio State University Columbus Ohio USA
| | - V. M. Balasubramaniam
- Department of Food Science & TechnologyThe Ohio State University Columbus Ohio USA
- Department of Food Agricultural and Biological EngineeringThe Ohio State University Columbus Ohio USA
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12
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Viana FM, Wang Y, Li S, Conte-Junior CA, Chen J, Zhu H, Suman SP. Thermal Instability Induced by 4-Hydroxy-2-Nonenal in Beef Myoglobin. MEAT AND MUSCLE BIOLOGY 2020. [DOI: 10.22175/mmb.9479] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
The secondary products of lipid oxidation, such as 4-hydroxy-2-nonenal (HNE), compromise myoglobin (Mb) redox stability and can thus impact thermal stability. Previous studies examined HNE-induced redox instability in beef Mb, whereas investigations are yet to be undertaken to evaluate the relationship between lipid oxidation and thermal stability of beef Mb. Therefore, the objective of the present study was to investigate the direct influence of HNE on thermal stability of beef Mb at meat conditions. Beef oxymyoglobin (0.15 mM) was incubated with HNE (1.0 mM) at pH 5.6 and 4°C for 21 d in the dark. Metmyoglobin formation, percentage Mb denaturation (PMD), and HNE adduction sites in Mb were examined on days 0, 7, 14, and 21. The experiment was replicated 3 times (n = 3). The data were evaluated using the MIXED procedure of SAS, and the differences among means were detected at the 5% level using the least significant difference test. The HNE-treated samples exhibited greater (P < 0.05) metmyoglobin formation and PMD than the controls. Additionally, the PMD difference between HNE-treated and control samples increased (P < 0.05) over time. Mass spectrometric analyses indicated that the number of HNE adduction sites increased with storage, and 6 histidines (positions 24, 36, 64, 93, 113, and 152) were adducted on day 21. HNE adduction at the distal histidine (position 64), which is critical to he me stability, was observed only on days 14 and 21. An increase in PMD on days 14 and 21 in HNE-treated samples could be partially due to the adduction at distal histidine. These findings indicated that HNE compromises thermal stability of beef Mb, possibly through altering the conformation of the heme protein by nucleophilic adduction.
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Affiliation(s)
| | - Yifei Wang
- University of Kentucky Department of Animal and Food Sciences
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13
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Aghaei Z, Ghorani B, Emadzadeh B, Kadkhodaee R, Tucker N. Protein-based halochromic electrospun nanosensor for monitoring trout fish freshness. Food Control 2020. [DOI: 10.1016/j.foodcont.2019.107065] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Scirè A, Tanfani F, Ausili A. A Spectroscopic Study on Secondary Structure and Thermal Unfolding of the Plant Toxin Gelonin Confirms Some Typical Structural Characteristics and Unravels the Sequence of Thermal Unfolding Events. Toxins (Basel) 2019; 11:toxins11090483. [PMID: 31443430 PMCID: PMC6783991 DOI: 10.3390/toxins11090483] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/19/2019] [Accepted: 08/21/2019] [Indexed: 11/17/2022] Open
Abstract
Gelonin from the Indian plant Gelonium multiflorum belongs to the type I ribosome-inactivating proteins (RIPs). Like other members of RIPs, this toxin glycoprotein inhibits protein synthesis of eukaryotic cells; hence, it is largely used in the construction of immunotoxins composed of cell-targeted antibodies. Lysosomal degradation is one of the main issues in targeted tumor therapies, especially for type I RIP-based toxins, as they lack the translocation domains. The result is an attenuated cytosolic delivery and a decrease of the antitumor efficacy of these plant-derived toxins; therefore, strategies to permit their release from endosomal vesicles or modifications of the toxins to make them resistant to degradation are necessary to improve their efficacy. Using infrared spectroscopy, we thoroughly analyzed both the secondary structure and the thermal unfolding of gelonin. Moreover, by the combination of two-dimensional correlation spectroscopy and phase diagram method, it was possible to deduce the sequence of events during the unfolding, confirming the typical characteristic of the RIP members to denature in two steps, as a sequential loss of tertiary and secondary structure was detected at 58 °C and at 65 °C, respectively. Additionally, some discrepancies in the unfolding process between gelonin and saporin-S6, another type I RIP protein, were detected.
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Affiliation(s)
- Andrea Scirè
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Fabio Tanfani
- Dipartimento di Scienze della Vita e dell'Ambiente, Università Politecnica delle Marche, 60131 Ancona, Italy
| | - Alessio Ausili
- Departamento de Bioquímica y Biología Molecular "A", Facultad de Veterinaria, Regional Campus of International Excellence "Campus Mare Nostrum", Universidad de Murcia, 30100 Murcia, Spain.
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15
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Rahman MS, Go GW, Seo JK, Gul K, Choi SG, Yang HS. Thiol concentration, structural characteristics and gelling properties of bovine heart protein concentrates. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.05.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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16
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Sazonova S, Grube M, Shvirksts K, Galoburda R, Gramatina I. FTIR spectroscopy studies of high pressure-induced changes in pork macromolecular structure. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.038] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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17
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Potekhin SA, Khusainova RS. On the Width of Conformational Transitions of Biologically Important Macromolecules under the Influence of Pressure. Biophysics (Nagoya-shi) 2019. [DOI: 10.1134/s0006350919030187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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18
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Abstract
The discovery of microbial communities in extreme conditions that would seem hostile to life leads to the question of how the molecules making up these microbes can maintain their structure and function. While microbes that live under extremes of temperature have been heavily studied, those that live under extremes of pressure, or "piezophiles", are now increasingly being studied because of advances in sample collection and high-pressure cells for biochemical and biophysical measurements. Here, adaptations of enzymes in piezophiles against the effects of pressure are discussed in light of recent experimental and computational studies. However, while concepts from studies of enzymes from temperature extremophiles can provide frameworks for understanding adaptations by piezophile enzymes, the effects of temperature and pressure on proteins differ in significant ways. Thus, the state of the knowledge of adaptation in piezophile enzymes is still in its infancy and many more experiments and computational studies on different enzymes from a variety of piezophiles are needed.
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Affiliation(s)
- Toshiko Ichiye
- Department of Chemistry, Georgetown University, Washington, DC, 20057, United States
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19
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Changes in secondary structure of myofibrillar protein and its relationship with water dynamic changes during storage of battered and deep-fried pork slices. Food Sci Biotechnol 2018; 27:1667-1673. [PMID: 30483430 DOI: 10.1007/s10068-018-0395-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Revised: 04/27/2018] [Accepted: 05/02/2018] [Indexed: 12/18/2022] Open
Abstract
Fourier transform infrared spectroscopy was used to analyze the changes of secondary structure of myofibrillar proteins in short-term storage of battered and deep-fried pork slices. These changes were combined with low-field NMR analysis results to analyze the correlation between secondary structure and dynamic changes of water content. The results showed that the number of α-helix and β-sheet decreased by 22.90 and 16.54% respectively, and the orderly structure changed to the disorder structure. The correlation results show that NMR spin-spin relaxation time (T21) has a high negative correlation with α-helix, β-sheet, and has a high positive correlation with irregular curl and β-turn. The population of immobile water (P22) has a very high positive correlation with α-helix, β-sheet, and has a relatively high negative correlation with irregular curl and β-turn. The immobilized water plays an important role in maintaining the secondary structure.
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20
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Wall KR, Kerth CR, Miller RK, Alvarado C. Grilling temperature effects on tenderness, juiciness, flavor and volatile aroma compounds of aged ribeye, strip loin, and top sirloin steaks. Meat Sci 2018; 150:141-148. [PMID: 30473394 DOI: 10.1016/j.meatsci.2018.11.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 10/08/2018] [Accepted: 11/05/2018] [Indexed: 10/27/2022]
Abstract
Ribeye, top loin, and top sirloin steaks were assigned a grilling temperature setting (177°C, 205°C, or 232°C) and consumer panel, Warner-Bratzler shear force, trained sensory panel, and GC/MS - olfactory analyses were performed. No differences (P > 0.05) in consumer overall, tenderness, juiciness, appearance, and flavor liking were detected among steak type or grill temperature. Grill surface temperature had no effect (P > 0.05) on trained panel tenderness scores. Of the volatiles present during an aroma event, pyrazine compounds were most influenced by grill surface temperature. The tenderness and juiciness of steaks grilled at differing temperatures were not perceived to be different by consumers; however, grilling temperature impacted the flavor of the final product by generating more pyrazine compounds. Steaks in this study likely were too tender to have a grilling effect on tenderness, but selecting different grilling temperatures can be used to vary the amount of browning of steaks and/or to modify aroma volatile compounds.
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Affiliation(s)
- Kayley R Wall
- Texas A&M University Animal Science Department, 2471 TAMU, College Station, TX 77843, USA
| | - Chris R Kerth
- Texas A&M University Animal Science Department, 2471 TAMU, College Station, TX 77843, USA.
| | - Rhonda K Miller
- Texas A&M University Animal Science Department, 2471 TAMU, College Station, TX 77843, USA
| | - Christine Alvarado
- Texas A&M University Poultry Science Department, College Station, TX 77843, USA
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21
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Madadlou A, Floury J, Dupont D. Structural Assessment and Catalytic Oxidation Activity of Hydrophobized Whey Proteins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:12025-12033. [PMID: 30394743 DOI: 10.1021/acs.jafc.8b02362] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Chemical modification of whey proteins allows manipulation of their characteristics, such as surface charge and hydrophobicity. Herein, we report the influence of hydrophobization accomplished by a preacetylation stage and a subsequent combined acetylation-heating process on some characteristics of whey proteins. Hydrophobization extensively (≥90%) acetylated the available free amino groups of whey proteins. The produced protein particles were nanoscaled (75 nm) and had a significantly low isoelectric point (3.70). Hydrophobization increased the β-sheet content of whey proteins and significantly decreased the solvent exposure of tyrosine residues. It also conferred a less compact tertiary structure to the proteins and decreased the extent of disulfide-bond formation by heating. The mobility of α-lactalbumin in nonreducing electrophoresis gel increased as a consequence of hydrophobization. Then, the ability of whey proteins to catalyze hydroquinone autoxidation was examined, and it was found that the activity decreased as a result of hydrophobization. The catalytic activity of the proteins was associated with the free-amino-group content, which determined the extent of cation-π attractive interactions; ζ-potential, which determined the extent of anion-π repulsive interactions; and π-stacking between hydrophobic residues and the electron cloud of the quinone ring.
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Affiliation(s)
- Ashkan Madadlou
- STLO, UMR 1253 , INRA, Agrocampus Ouest , 35000 Rennes , France
| | - Juliane Floury
- STLO, UMR 1253 , INRA, Agrocampus Ouest , 35000 Rennes , France
| | - Didier Dupont
- STLO, UMR 1253 , INRA, Agrocampus Ouest , 35000 Rennes , France
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22
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Loreto S, Cuypers B, Brokken J, Van Doorslaer S, De Wael K, Meynen V. The effect of the buffer solution on the adsorption and stability of horse heart myoglobin on commercial mesoporous titanium dioxide: a matter of the right choice. Phys Chem Chem Phys 2018; 19:13503-13514. [PMID: 28497146 DOI: 10.1039/c6cp08585g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Despite the numerous studies on the adsorption of different proteins onto mesoporous titanium dioxide and indications on the important role of buffer solutions in bioactivity, a systematic study on the impact of the buffer on the protein incorporation into porous substrates is still lacking. We here studied the interaction between a commercial mesoporous TiO2 and three of the most used buffers for protein incorporation, i.e. HEPES, Tris and phosphate buffer. In addition, this paper analyzes the adsorption of horse heart myoglobin (hhMb) onto commercial mesoporous TiO2 as a model system to test the influence of buffers on the protein incorporation behavior in mesoporous TiO2. N2 sorption analysis, FT-IR and TGA/DTG measurements were used to evaluate the interaction between the buffers and the TiO2 surface, and the effect of such an interaction on hhMb adsorption. Cyclic voltammetry (CV) and electron paramagnetic resonance (EPR) were used to detect changes in the microenvironment surrounding the heme. The three buffers show a completely different interaction with the TiO2 surface, which drastically affects the adsorption of myoglobin as well as its structure and electrochemical activity. Therefore, special attention is required while choosing the buffer medium to avoid misguided evaluation of protein adsorption on mesoporous TiO2.
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Affiliation(s)
- Stefano Loreto
- Department of Chemistry, University of Antwerp, 2610 Wilrijk, Belgium. and Department of Chemistry, University of Antwerp, 2010 Antwerpen, Belgium
| | - Bert Cuypers
- Department of Physics, University of Antwerp, 2610 Wilrijk, Belgium
| | - Jacotte Brokken
- Department of Chemistry, University of Antwerp, 2610 Wilrijk, Belgium.
| | | | - Karolien De Wael
- Department of Chemistry, University of Antwerp, 2010 Antwerpen, Belgium
| | - Vera Meynen
- Department of Chemistry, University of Antwerp, 2610 Wilrijk, Belgium.
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23
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Motoyama M, Vénien A, Loison O, Sandt C, Watanabe G, Sicard J, Sasaki K, Astruc T. In situ characterization of acidic and thermal protein denaturation by infrared microspectroscopy. Food Chem 2018; 248:322-329. [DOI: 10.1016/j.foodchem.2017.11.031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 11/08/2017] [Accepted: 11/08/2017] [Indexed: 01/13/2023]
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24
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Wang G, Bondarenko PV, Kaltashov IA. Multi-step conformational transitions in heat-treated protein therapeutics can be monitored in real time with temperature-controlled electrospray ionization mass spectrometry. Analyst 2018; 143:670-677. [PMID: 29303166 DOI: 10.1039/c7an01655g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heat-induced conformational transitions are frequently used to probe the free energy landscapes of proteins. However, the extraction of information from thermal denaturation profiles pertaining to non-native protein conformations remains challenging due to their transient nature and significant conformational heterogeneity. Previously we developed a temperature-controlled electrospray ionization (ESI) source that allowed unfolding and association of biopolymers to be monitored by mass spectrometry (MS) in real time as a function of temperature. The scope of this technique is now extended to systems that undergo multi-step denaturation upon heat stress, as well as relatively small-scale conformational changes that are precursors to protein aggregation. The behavior of two therapeutic proteins (human antithrombin and an IgG1 monoclonal antibody) under heat-stress conditions is monitored in real time, providing evidence that relatively small-scale conformational changes in each system lead to protein oligomerization, followed by aggregation. Temperature-controlled ESI MS is particularly useful for the studies of heat-stressed multi-domain proteins such as IgG, where it allows distinct transitions to be observed. The ability of native temperature-controlled ESI MS to monitor both the conformational changes and oligomerization/degradation with high selectivity complements the classic calorimetric methods, lending itself as a powerful experimental tool for the thermostability studies of protein therapeutics.
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Affiliation(s)
- Guanbo Wang
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, Jiangsu Key Laboratory of Biomedical Materials, and School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu, China.
| | - Pavel V Bondarenko
- Attribute Sciences, Process Development, Amgen, Inc., Thousand Oaks, CA, USA
| | - Igor A Kaltashov
- Department of Chemistry, University of Massachusetts-Amherst, Amherst, MA, USA
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25
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Grube M, Shvirksts K, Krafft C, Kokorevicha S, Zandberga E, Abols A, Line A, Kalnenieks U. Miniature diamond-anvil cells for FTIR-microspectroscopy of small quantities of biosamples. Analyst 2018; 143:3595-3599. [DOI: 10.1039/c8an00432c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A small amount of biosample is mounted on a diamond anvil cell and spectra registered using simple 15× infrared objective instead of being grown on a diamond and measured by FTIR-ATR.
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Affiliation(s)
- Mara Grube
- Institute of Microbiology and Biotechnology
- University of Latvia
- Latvia
| | - Karlis Shvirksts
- Institute of Microbiology and Biotechnology
- University of Latvia
- Latvia
| | | | - Silvija Kokorevicha
- State Forensic Science Bureau
- Ministry of Justice of the Republic of Latvia
- Latvia
| | | | - Arturs Abols
- Latvian Biomedical Research and Study centre
- Riga
- Latvia
| | - Aija Line
- Latvian Biomedical Research and Study centre
- Riga
- Latvia
| | - Uldis Kalnenieks
- Institute of Microbiology and Biotechnology
- University of Latvia
- Latvia
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26
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Roche J, Royer CA, Roumestand C. Monitoring protein folding through high pressure NMR spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2017; 102-103:15-31. [PMID: 29157491 DOI: 10.1016/j.pnmrs.2017.05.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 05/31/2017] [Accepted: 05/31/2017] [Indexed: 06/07/2023]
Abstract
High-pressure is a well-known perturbation method used to destabilize globular proteins. It is perfectly reversible, which is essential for a proper thermodynamic characterization of a protein equilibrium. In contrast to other perturbation methods such as heat or chemical denaturant that destabilize protein structures uniformly, pressure exerts local effects on regions or domains of a protein containing internal cavities. When combined with NMR spectroscopy, hydrostatic pressure offers the possibility to monitor at a residue level the structural transitions occurring upon unfolding and to determine the kinetic properties of the process. High-pressure NMR experiments can now be routinely performed, owing to the recent development of commercially available high-pressure sample cells. This review summarizes recent advances and some future directions of high-pressure NMR techniques for the characterization at atomic resolution of the energy landscape of protein folding.
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Affiliation(s)
- Julien Roche
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
| | - Catherine A Royer
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Christian Roumestand
- Centre de Biochimie Structural INSERM U1054, CNRS UMMR 5058, Université de Montpellier, Montpellier 34090, France.
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27
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Bak KH, Bolumar T, Karlsson AH, Lindahl G, Orlien V. Effect of high pressure treatment on the color of fresh and processed meats: A review. Crit Rev Food Sci Nutr 2017; 59:228-252. [DOI: 10.1080/10408398.2017.1363712] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- K. H. Bak
- University of Copenhagen, Faculty of Science, Department of Food Science, Frederiksberg C, Denmark
| | - T. Bolumar
- CSIRO, Agriculture and Food, Meat Science Team, Coopers Plains, Queensland, Australia
| | - A. H. Karlsson
- Department of Animal Environment and Health, Swedish University of Agricultural Sciences, Skara, Sweden
| | | | - V. Orlien
- University of Copenhagen, Faculty of Science, Department of Food Science, Frederiksberg C, Denmark
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28
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Cinar S, Czeslik C. Bioresponsive interfaces composed of calmodulin and poly(ethylene glycol): Toggling the interfacial film thickness by protein-ligand binding. Colloids Surf B Biointerfaces 2017; 158:9-15. [PMID: 28658645 DOI: 10.1016/j.colsurfb.2017.06.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 06/14/2017] [Accepted: 06/20/2017] [Indexed: 11/25/2022]
Abstract
Responsive interfaces are often realized by polymer films that change their structure and properties upon changing the pH-value, ionic strength or temperature. Here, we present a bioresponsive interfacial structure that is based on a protein, calmodulin (CaM), which undergoes a huge conformational change upon ligand binding. At first, we characterize the conformational functionality of a double Cys mutant of CaM by small-angle X-ray scattering (SAXS) and Fourier transform infrared (FTIR) spectroscopy. The CaM mutant is then used to cross-link poly(ethylene glycol) (PEG) chains, which are bound covalently to a supporting planar Si surface. These films are characterized by X-ray reflectometry (XR) in a humidity chamber providing full hydration. It is well known that Ca2+-saturated holo-CaM binds trifluoperazine (TFP) and changes its conformation from an open, dumbbell-shaped to a closed, globular one in solution. At the interface, we observe an increase of the PEG-CaM film thickness, when TFP is binding and inducing the closed conformation, whereas the removal of Ca2+-ions and a concomitant release of TFP is associated with a decrease of the film thickness. This toggling of the film thickness is largely reversible. In this way, a structural change of the interface is achieved via protein functionality which has the advantage of being selective for ligand molecules without changing the environmental conditions in a harsh way via physico-chemical parameters.
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Affiliation(s)
- Süleyman Cinar
- TU Dortmund University, Department of Chemistry and Chemical Biology, D-44221 Dortmund, Germany
| | - Claus Czeslik
- TU Dortmund University, Department of Chemistry and Chemical Biology, D-44221 Dortmund, Germany.
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29
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Formation of amyloid fibrils from soy protein hydrolysate: Effects of selective proteolysis on β-conglycinin. Food Res Int 2017; 100:268-276. [PMID: 28888450 DOI: 10.1016/j.foodres.2017.08.059] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 08/25/2017] [Accepted: 08/26/2017] [Indexed: 11/24/2022]
Abstract
The soy protein hydrolysate subjected to selective proteolysis on β-conglycinin (referred to as DβH, contrast group) and a control soy protein isolate sample without addition of protease (referred to as CSPI, blank group) were adopted as experimental samples. By employing the "subtraction" mode of logical thinking, we aimed to compare the differences between CSPI and DβH on fibrillation at pH2.0 with heating at 95°C. The results showed when heated for 60min, CSPI tended to form short worm-like fibrils while DβH long semiflexible fibrils. When heating time was prolonged to 360min, the fibrils formed from them both exhibited cluster. Whereas when heated for 720min, no fibrillar aggregates appeared from them. This study would help explore the effects of β-conglycinin on the fibril formation of soy protein isolate by a new way.
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30
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Cheng W, Sun DW, Pu H, Wei Q. Chemical spoilage extent traceability of two kinds of processed pork meats using one multispectral system developed by hyperspectral imaging combined with effective variable selection methods. Food Chem 2017; 221:1989-1996. [DOI: 10.1016/j.foodchem.2016.11.093] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Revised: 10/19/2016] [Accepted: 11/21/2016] [Indexed: 01/25/2023]
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31
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Keppler JK, Martin D, Garamus VM, Berton-Carabin C, Nipoti E, Coenye T, Schwarz K. Functionality of whey proteins covalently modified by allyl isothiocyanate. Part 1 physicochemical and antibacterial properties of native and modified whey proteins at pH 2 to 7. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.11.016] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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32
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Rodio M, Coluccino L, Romeo E, Genovese A, Diaspro A, Garau G, Intartaglia R. Facile fabrication of bioactive ultra-small protein–hydroxyapatite nanoconjugates via liquid-phase laser ablation and their enhanced osteogenic differentiation activity. J Mater Chem B 2017; 5:279-288. [DOI: 10.1039/c6tb02023b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Ultra-small protein–hydroxyapatite nanoconjugates promote the osteogenic differentiation of mesenchymal stem cells.
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Affiliation(s)
- Marina Rodio
- Nanophysics
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Luca Coluccino
- Nanophysics
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Elisa Romeo
- D3 validation
- Drug Discovery and Development
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
| | - Alessandro Genovese
- Biological and Environmental Sciences and Engineering Division
- King Abdullah University for Science and Technology
- Kingdom of Saudi Arabia
- Nanochemistry
- Istituto Italiano di Tecnologia
| | | | - Gianpiero Garau
- D3 validation
- Drug Discovery and Development
- Istituto Italiano di Tecnologia
- 16163 Genova
- Italy
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33
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Qin L, Bi JR, Li DM, Dong M, Zhao ZY, Dong XP, Zhou DY, Zhu BW. Unfolding/Refolding Study on Collagen from Sea Cucumber Based on 2D Fourier Transform Infrared Spectroscopy. Molecules 2016; 21:molecules21111546. [PMID: 27854344 PMCID: PMC6274028 DOI: 10.3390/molecules21111546] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 11/02/2016] [Accepted: 11/11/2016] [Indexed: 11/16/2022] Open
Abstract
We aimed to explore the differences of thermal behaviors between insoluble collagen fibrils (ICFs) and pepsin-solubilized collagens (PSCs) from sea cucumber Stichopus japonicus. The unfolding/refolding sequences of secondary structures of ICFs and PSCs during the heating and cooling cycle (5 → 70 → 5 °C) were identified by Fourier transform infrared spectrometry combined with curve-fitting and 2D correlation techniques. ICFs showed a higher proportion of α-helical structures and higher thermostability than PSCs, and thus had more-stable triple helical structures. The sequences of changes affecting the secondary structures during heating were essentially the same between ICFs and PSCs. In all cases, α-helix structure was the most important conformation and it disappeared to form a β-sheet structure. In the cooling cycle, ICFs showed a partially refolding ability, and the proportion of β-sheet structure rose before the increasing proportion of α-helix structure. PSCs did not obviously refold during the cooling stage.
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Affiliation(s)
- Lei Qin
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
| | - Jing-Ran Bi
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China.
| | - Dong-Mei Li
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
| | - Meng Dong
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
| | - Zi-Yuan Zhao
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
| | - Xiu-Ping Dong
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
| | - Da-Yong Zhou
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
| | - Bei-Wei Zhu
- School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China.
- National Engineering Research Center of Seafood, Dalian 116034, China.
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34
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Variation in structure of proteins by adjusting reactive oxygen and nitrogen species generated from dielectric barrier discharge jet. Sci Rep 2016; 6:35883. [PMID: 27779212 PMCID: PMC5078802 DOI: 10.1038/srep35883] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 10/07/2016] [Indexed: 12/31/2022] Open
Abstract
Over the last few years, the variation in liquid chemistry due to the development of radicals generated by cold atmospheric plasma (CAP) has played an important role in plasma medicine. CAP direct treatment or CAP activated media treatment in cancer cells shows promising anticancer activity for both in vivo and in vitro studies. However, the anticancer activity or antimicrobial activity varies between plasma devices due to the different abilities among plasma devices to generate the reactive oxygen and nitrogen species (RONS) at different ratios and in different concentrations. While the generation of RONS depends on many factors, the feeding gas plays the most important role among the factors. Hence, in this study we used different compositions of feeding gas while fixing all other plasma characteristics. We used Ar, Ar-O2 (at different ratios), and Ar-N2 (at different ratios) as the working gases for CAP and investigated the structural changes in proteins (Hemoglobin (Hb) and Myoglobin (Mb)). We then analyzed the influence of RONS generated in liquid on the conformations of proteins. Additionally, to determine the influence of H2O2 on the Hb and Mb structures, we used molecular dynamic simulation.
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35
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Seo J, Hoffmann W, Warnke S, Bowers MT, Pagel K, von Helden G. Die Erhaltung nativer Proteinstrukturen unter Ausschluss von Lösungsmittel: eine Untersuchung mit Hilfe der Kombination von Ionenmobilität mit Spektroskopie. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jongcheol Seo
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Waldemar Hoffmann
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Stephan Warnke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
| | - Michael T. Bowers
- Department of Chemistry and Biochemistry University of California Santa Barbara Santa Barbara CA 93106 USA
| | - Kevin Pagel
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
- Institut für Chemie und Biochemie der Freien Universität Berlin Takustraße 3 14195 Berlin Deutschland
| | - Gert von Helden
- Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4–6 14195 Berlin Deutschland
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36
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Seo J, Hoffmann W, Warnke S, Bowers MT, Pagel K, von Helden G. Retention of Native Protein Structures in the Absence of Solvent: A Coupled Ion Mobility and Spectroscopic Study. Angew Chem Int Ed Engl 2016; 55:14173-14176. [PMID: 27545682 PMCID: PMC5113788 DOI: 10.1002/anie.201606029] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Indexed: 11/18/2022]
Abstract
Can the structures of small to medium‐sized proteins be conserved after transfer from the solution phase to the gas phase? A large number of studies have been devoted to this topic, however the answer has not been unambiguously determined to date. A clarification of this problem is important since it would allow very sensitive native mass spectrometry techniques to be used to address problems relevant to structural biology. A combination of ion‐mobility mass spectrometry with infrared spectroscopy was used to investigate the secondary and tertiary structure of proteins carefully transferred from solution to the gas phase. The two proteins investigated are myoglobin and β‐lactoglobulin, which are prototypical examples of helical and β‐sheet proteins, respectively. The results show that for low charge states under gentle conditions, aspects of the native secondary and tertiary structure can be conserved.
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Affiliation(s)
- Jongcheol Seo
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Waldemar Hoffmann
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Stephan Warnke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Michael T Bowers
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Kevin Pagel
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.,Institut für Chemie und Biochemie der, Freien Universität Berlin, Takustrasse 3, 14195, Berlin, Germany
| | - Gert von Helden
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany.
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37
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Vemula S, Vemula S, Dedaniya A, Kante RK, Ronda SR. Characterization of recombinant human granulocyte colony-stimulating factor expression by FT-IR spectroscopy: Studies on thermal induction and media formulation on the stability of the protein secondary structure. Prep Biochem Biotechnol 2016; 46:586-95. [PMID: 26528735 DOI: 10.1080/10826068.2015.1084933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The Fourier-transform infrared (FT-IR) spectroscopic approach has been employed to understand the recombinant human G-CSF (rhG-CSF) protein accumulation, secondary structure, and thermal stability in Escherichia coli grown under a temperature shift strategy (37 and 28°C) in various media formulations. The choline + sodium pyruvate (37°C) and sodium pyruvate (28°C) formulations have shown the highest inclusion body (IB) accumulation of 0.41 and 0.46 mg/mL, respectively. Furthermore, insights on the structure of the rhG-CSF within IBs and intact cells have been investigated through secondary structure analysis. Thermal stability experiments were also carried out to explain the pattern of the second derivative structure of rhG-CSF. The studies showed that choline + sodium pyruvate formulation has preserved the protein secondary structure even at 82°C. Overall, the FT-IR spectroscopic technique can also be adopted to accelerate the characterization of other recombinant therapeutic proteins of E. coli origin.
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Affiliation(s)
- Sandeep Vemula
- a Centre for Bioprocess Technology, Department of Biotechnology , K. L. E. F. University , Guntur , Andhra Pradesh , India
| | - Sushma Vemula
- b Department of Pharmacology, Kakatiya University , Warangal , Andhra Pradesh , India
| | - Akshay Dedaniya
- a Centre for Bioprocess Technology, Department of Biotechnology , K. L. E. F. University , Guntur , Andhra Pradesh , India
| | - Rajesh Kumar Kante
- a Centre for Bioprocess Technology, Department of Biotechnology , K. L. E. F. University , Guntur , Andhra Pradesh , India
| | - Srinivasa Reddy Ronda
- a Centre for Bioprocess Technology, Department of Biotechnology , K. L. E. F. University , Guntur , Andhra Pradesh , India
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38
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Dhakal S, Giusti MM, Balasubramaniam VM. Effect of high pressure processing on dispersive and aggregative properties of almond milk. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2016; 96:3821-3830. [PMID: 26679559 DOI: 10.1002/jsfa.7576] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 09/30/2015] [Accepted: 12/06/2015] [Indexed: 06/05/2023]
Abstract
BACKGROUND A study was conducted to investigate the impact of high pressure (450 and 600 MPa at 30 °C) and thermal (72, 85 and 99 °C at 0.1 MPa) treatments on dispersive and aggregative characteristics of almond milk. Experiments were conducted using a kinetic pressure testing unit and water bath. Particle size distribution, microstructure, UV absorption spectra, pH and color changes of processed and unprocessed samples were analyzed. RESULTS Raw almond milk represented the mono model particle size distribution with average particle diameters of 2 to 3 µm. Thermal or pressure treatment of almond milk shifted the particle size distribution towards right and increased particle size by five- to six-fold. Micrographs confirmed that both the treatments increased particle size due to aggregation of macromolecules. Pressure treatment produced relatively more and larger aggregates than those produced by heat treated samples. The apparent aggregation rate constant for 450 MPa and 600 MPa processed samples were k450MPa,30°C = 0.0058 s(-1) and k600MPa,30°C = 0.0095 s(-1) respectively. CONCLUSIONS This study showed that dispersive and aggregative properties of high pressure and heat-treated almond milk were different due to differences in protein denaturation, particles coagulation and aggregates morphological characteristics. Knowledge gained from the study will help food processors to formulate novel plant-based beverages treated with high pressure. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Santosh Dhakal
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
| | - M Monica Giusti
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
| | - V M Balasubramaniam
- Department of Food Science & Technology, The Ohio State University, Columbus, OH, 43210, USA
- Department of Food Agricultural and Biological Engineering, The Ohio State University, Columbus, OH, 43210, USA
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39
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Ribeiro A, Volkov V, Oliveira MB, Padrão J, Mano JF, Gomes AC, Cavaco-Paulo A. BSA/HSA ratio modulates the properties of Ca(2+)-induced cold gelation scaffolds. Int J Biol Macromol 2016; 89:535-44. [PMID: 27156695 DOI: 10.1016/j.ijbiomac.2016.05.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 05/03/2016] [Accepted: 05/04/2016] [Indexed: 11/27/2022]
Abstract
An effective tissue engineering approach requires adjustment according to the target tissue to be engineered. The possibility of obtaining a protein-based formulation for the development of multivalent tunable scaffolds that can be adapted for several types of cells and tissues is explored in this work. The incremental substitution of bovine serum albumin (BSA) by human serum albumin (HSA), changing the scaffolds' hydrophilic/hydrophobic ratio, on a previously optimized scaffold formulation resulted in a set of uniform porous scaffolds with different physical properties and associated cell proliferation profile along time. There was a general trend towards an increase in hydrophilicity, swelling degree and in vitro degradation of the scaffolds with increasing replacement of BSA by HAS. The set of BSA/HSA scaffolds presented distinct values for the storage (elastic) modulus and loss factor which were similar to those described for different native tissues such as bone, cartilage, muscle, skin and neural tissue. The preferential adhesion and proliferation of skin fibroblasts on the BSA25%HSA75% and HSA100% scaffolds, as predicted by their viscoelastic properties, demonstrate that the BSA/HSA scaffold formulation is promising for the development of scaffolds that can be tuned according to the tissue to be repaired and restored.
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Affiliation(s)
- Artur Ribeiro
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal; CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Vadim Volkov
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
| | - Mariana B Oliveira
- B's Research Group-Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Jorge Padrão
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal
| | - João F Mano
- B's Research Group-Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Andreia C Gomes
- CBMA (Centre of Molecular and Environmental Biology), Department of Biology, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
| | - Artur Cavaco-Paulo
- CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal.
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40
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Erwin N, Patra S, Winter R. Probing conformational and functional substates of calmodulin by high pressure FTIR spectroscopy: influence of Ca2+ binding and the hypervariable region of K-Ras4B. Phys Chem Chem Phys 2016; 18:30020-30028. [DOI: 10.1039/c6cp06553h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using pressure perturbation, conformational substates of CaM could be uncovered that conceivably facilitate target recognition by exposing the required binding surfaces.
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Affiliation(s)
- Nelli Erwin
- Physical Chemistry I - Biophysical Chemistry
- Faculty of Chemistry and Chemical Biology
- TU Dortmund University
- D-44227 Dortmund
- Germany
| | - Satyajit Patra
- 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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41
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Rašković B, Vatić S, Anđelković B, Blagojević V, Polović N. Optimizing storage conditions to prevent cold denaturation of trypsin for sequencing and to prolong its shelf life. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2015.09.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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42
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Khalil M, Boubegtiten-Fezoua Z, Hellmann N, Hellwig P. Extraordinary stability of hemocyanins from L. polyphemus and E. californicum studied using infrared spectroscopy from 294 to 20 K. Phys Chem Chem Phys 2016; 18:28732-28739. [DOI: 10.1039/c6cp03510h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Infrared spectroscopic evidence of a high stability towards exposure to sub-zero temperatures for hemocyanins from the arthropods Limulus polyphemus and Eurypelma californicum.
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Affiliation(s)
- Mireille Khalil
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140 Université de Strasbourg CNRS
- 1 Rue Blaise Pascal 67070
- France
| | - Zahia Boubegtiten-Fezoua
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140 Université de Strasbourg CNRS
- 1 Rue Blaise Pascal 67070
- France
| | - Nadja Hellmann
- Institute for Molecular Biophysics
- University of Mainz
- 55128 Mainz
- Germany
| | - Petra Hellwig
- Laboratoire de Bioélectrochimie et Spectroscopie
- UMR 7140 Université de Strasbourg CNRS
- 1 Rue Blaise Pascal 67070
- France
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43
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Makarov AA, Helmy R. Combining size-exclusion chromatography with differential hydrogen–deuterium exchange to study protein conformational changes. J Chromatogr A 2016; 1431:224-230. [DOI: 10.1016/j.chroma.2015.12.069] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 12/25/2015] [Indexed: 01/12/2023]
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44
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Del Galdo S, Amadei A. The unfolding effects on the protein hydration shell and partial molar volume: a computational study. Phys Chem Chem Phys 2016; 18:28175-28182. [DOI: 10.1039/c6cp05029h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper we apply the computational analysis recently proposed by our group to characterize the solvation properties of a native protein in aqueous solution, and to four model aqueous solutions of globular proteins in their unfolded states thus characterizing the protein unfolded state hydration shell and quantitatively evaluating the protein unfolded state partial molar volumes.
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Affiliation(s)
- Sara Del Galdo
- Department of Chemical Science and Technology
- University of Roma Tor Vergata
- 00133 Roma
- Italy
| | - Andrea Amadei
- Department of Chemical Science and Technology
- University of Roma Tor Vergata
- 00133 Roma
- Italy
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45
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Sánchez M, Scirè A, Tanfani F, Ausili A. The thermal unfolding of the ribosome-inactivating protein saporin-S6 characterized by infrared spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:1357-64. [DOI: 10.1016/j.bbapap.2015.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/08/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
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46
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Branca C, Wanderlingh U, D'Angelo G, Crupi C, Rifici S. Study of the dynamical behavior of sodium alginate/myoglobin aqueous solutions: A dynamic light scattering study. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.06.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Cruz-Angeles J, Martínez LM, Videa M. Application of ATR-FTIR spectroscopy to the study of thermally induced changes in secondary structure of protein molecules in solid state. Biopolymers 2015; 103:574-84. [DOI: 10.1002/bip.22664] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/14/2015] [Accepted: 04/25/2015] [Indexed: 01/18/2023]
Affiliation(s)
- Jorge Cruz-Angeles
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
| | - Luz María Martínez
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
| | - Marcelo Videa
- Department of Chemistry and School of Engineering and Sciences; Tecnológico de Monterrey; Campus Monterrey Ave. Eugenio Garza Sada 2501 Sur. Monterrey N.L. México C.P. 64849
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48
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Rašković B, Popović M, Ostojić S, Anđelković B, Tešević V, Polović N. Fourier transform infrared spectroscopy provides an evidence of papain denaturation and aggregation during cold storage. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 150:238-246. [PMID: 26051646 DOI: 10.1016/j.saa.2015.05.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 05/06/2015] [Accepted: 05/12/2015] [Indexed: 06/04/2023]
Abstract
Papain is a cysteine protease with wide substrate specificity and many applications. Despite its widespread applications, cold stability of papain has never been studied. Here, we used differential spectroscopy to monitor thermal denaturation process. Papain was the most stabile from 45 °C to 60 °C with ΔG°321 of 13.9±0.3 kJ/mol and Tm value of 84±1 °C. After cold storage, papain lost parts of its native secondary structures elements which gave an increase of 40% of intermolecular β-sheet content (band maximum detected at frequency of 1621 cm(-1) in Fourier transform infrared (FT-IR) spectrum) indicating the presence of secondary structures necessary for aggregation. The presence of protein aggregates after cold storage was also proven by analytical size exclusion chromatography. After six freeze-thaw cycles around 75% of starting enzyme activity of papain was lost due to cold denaturation and aggregation of unfolded protein. Autoproteolysis of papain did not cause significant loss of the protein activity. Upon the cold storage, papain underwent structural rearrangements and aggregation that correspond to other cold denatured proteins, rather than autoproteolysis which could have the commercial importance for the growing polypeptide based industry.
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Affiliation(s)
- Brankica Rašković
- Department of Biochemistry, University of Belgrade - Faculty of Chemistry, Studentski trg 12 - 16, 11000 Belgrade, Serbia
| | - Milica Popović
- Department of Biochemistry, University of Belgrade - Faculty of Chemistry, Studentski trg 12 - 16, 11000 Belgrade, Serbia
| | - Sanja Ostojić
- Institute of General and Physical Chemistry, Studentski trg 12, 11000 Belgrade, Serbia
| | - Boban Anđelković
- Department of Organic Chemistry, University of Belgrade - Faculty of Chemistry, Studentski trg 12 - 16, 11000 Belgrade, Serbia
| | - Vele Tešević
- Department of Organic Chemistry, University of Belgrade - Faculty of Chemistry, Studentski trg 12 - 16, 11000 Belgrade, Serbia
| | - Natalija Polović
- Department of Biochemistry, University of Belgrade - Faculty of Chemistry, Studentski trg 12 - 16, 11000 Belgrade, Serbia.
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49
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Structure-relaxation mechanism for the response of T4 lysozyme cavity mutants to hydrostatic pressure. Proc Natl Acad Sci U S A 2015; 112:E2437-46. [PMID: 25918400 DOI: 10.1073/pnas.1506505112] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Application of hydrostatic pressure shifts protein conformational equilibria in a direction to reduce the volume of the system. A current view is that the volume reduction is dominated by elimination of voids or cavities in the protein interior via cavity hydration, although an alternative mechanism wherein cavities are filled with protein side chains resulting from a structure relaxation has been suggested [López CJ, Yang Z, Altenbach C, Hubbell WL (2013) Proc Natl Acad Sci USA 110(46):E4306-E4315]. In the present study, mechanisms for elimination of cavities under high pressure are investigated in the L99A cavity mutant of T4 lysozyme and derivatives thereof using site-directed spin labeling, pressure-resolved double electron-electron resonance, and high-pressure circular dichroism spectroscopy. In the L99A mutant, the ground state is in equilibrium with an excited state of only ∼ 3% of the population in which the cavity is filled by a protein side chain [Bouvignies et al. (2011) Nature 477(7362):111-114]. The results of the present study show that in L99A the native ground state is the dominant conformation to pressures of 3 kbar, with cavity hydration apparently taking place in the range of 2-3 kbar. However, in the presence of additional mutations that lower the free energy of the excited state, pressure strongly populates the excited state, thereby eliminating the cavity with a native side chain rather than solvent. Thus, both cavity hydration and structure relaxation are mechanisms for cavity elimination under pressure, and which is dominant is determined by details of the energy landscape.
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50
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Abstract
Proteins are essential players in the vast majority of molecular level life processes. Since their structure is in most cases substantial for their correct function, study of their structural changes attracted great interest in the past decades. The three dimensional structure of proteins is influenced by several factors including temperature, pH, presence of chaotropic and cosmotropic agents, or presence of denaturants. Although pressure is an equally important thermodynamic parameter as temperature, pressure studies are considerably less frequent in the literature, probably due to the technical difficulties associated to the pressure studies. Although the first steps in the high-pressure protein study have been done 100 years ago with Bridgman's ground breaking work, the field was silent until the modern spectroscopic techniques allowed the characterization of the protein structural changes, while the protein was under pressure. Recently a number of proteins were studied under pressure, and complete pressure-temperature phase diagrams were determined for several of them. This review summarizes the thermodynamic background of the typical elliptic p-T phase diagram, its limitations and the possible reasons for deviations of the experimental diagrams from the theoretical one. Finally we show some examples of experimentally determined pressure-temperature phase diagrams.
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Affiliation(s)
- László Smeller
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary,
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