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Menzen T. Is Lyophilization Key for Transportation and Storage of Biopharmaceutical Drug Products in Space? J Pharm Sci 2024; 113:1695-1700. [PMID: 38701895 DOI: 10.1016/j.xphs.2024.04.030] [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: 03/14/2024] [Revised: 04/29/2024] [Accepted: 04/29/2024] [Indexed: 05/05/2024]
Abstract
Long-lasting space missions as well as space tourism are technically possible today and economically in reach. It is a matter of time until the use of biopharmaceutical drug products in space will be common practice. Until drug product manufacturing in space is possible, the products need to be brought to space with rockets, which means that stable and light-weight products are preferred. Lyophilization is a promising approach to reduce weight during transportation and achieve storage stability at room temperature without cold-chain demands. This implies that recycled water in space needs to be used for reconstitution which poses a microbiological challenge and should be considered during formulation development. Furthermore, administration of the injectable drugs in space has an impact on the chosen packaging material which needs to be considered during drug product development.
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Affiliation(s)
- Tim Menzen
- Coriolis Pharma, Fraunhoferstr. 18 b, 82152 Martinsried, Germany.
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2
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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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3
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Effect of irradiation modification on conformation and gelation properties of pork myofibrillar and sarcoplasmic protein. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2018.05.047] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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4
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Emulsifying properties development of pork myofibrillar and sacroplasmic protein irradiated at different dose: A combined FT-IR spectroscopy and low-field NMR study. Food Chem 2018; 252:108-114. [DOI: 10.1016/j.foodchem.2018.01.104] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/22/2017] [Accepted: 01/14/2018] [Indexed: 11/23/2022]
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5
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Effect of Technically Relevant X-Ray Doses on the Structure and Function of Alcohol Dehydrogenase and Hen Egg-White Lysozyme. Pharm Res 2018; 35:135. [DOI: 10.1007/s11095-018-2417-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 04/22/2018] [Indexed: 10/17/2022]
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6
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Free radical studies of components of the extracellular matrix: contributions to protection of biomolecules and biomaterials from sterilising doses of ionising radiation. Cell Tissue Bank 2017; 19:201-213. [PMID: 28871437 DOI: 10.1007/s10561-017-9650-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 08/08/2017] [Indexed: 10/18/2022]
Abstract
The purpose of the current review is show how the principles and techniques of radiation chemistry have enabled the direct reactions of free radicals with biomolecules and biomaterials to be investigated at the molecular level. In particular, the review focusses on the free radical-induced fragmentation of glycosaminoglycans. Glycosaminoglycans are large linear polysaccharides consisting of repeating disaccharide units and are important components of the extracellular matrix (ECM) either in free form (hyaluronan) or as a component of proteoglycans. Oxidative damage of the extracellular matrix components by either enzymatic or non-enzymatic pathways may have implications for the initiation and progression of a range of human diseases. These include arthritis, kidney disease, cardiovascular disease, lung disease, periodontal disease and chronic inflammation. Oxidative damage to hyaluronan by reactive oxidative species and thus the potential mechanism of damage to the ECM and its role in human pathologies is reviewed with particular focus on damage initiated by potential in vivo free radicals such as superoxide, carbonate and hydroxyl radicals. Such knowledge has also allowed radiation protecting systems to be developed so that sterilising doses of radiation can be delivered to sensitive biomolecules such as proteins and glycosaminoglycans, and also to sensitive biomaterials such as tissue allografts.
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Lee NY, Kang CS, Kim HS. Effects of γ-irradiation on the quality changes of fresh noodles prepared from wheat cultivated with N-fertilization treatments. Food Sci Biotechnol 2017; 26:135-142. [PMID: 30263520 PMCID: PMC6049498 DOI: 10.1007/s10068-017-0018-1] [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: 08/23/2016] [Revised: 11/11/2016] [Accepted: 11/11/2016] [Indexed: 10/20/2022] Open
Abstract
Quality changes of fresh noodles prepared from wheat cultivated with N-fertilization treatments, followed by γ-irradiation were investigated. The protein content of the KPS60 was the highest of all treated samples, and protein contents of wheat cultivated with N-fertilizer was increased. γ-Irradiation did not affect the protein contents of the samples. However, the water holding capacity and resistant starch contents was increased by irradiation. The dry gluten and wet gluten contents of samples were further increased by γ-irradiation. The pasting properties were influenced by γ-irradiation but not N-fertilization. The hardness of noodles made with irradiated wheat flour was decreased, but the degree of decrease was small compared with that of viscosity. The gumminess and chewiness of noodles made with irradiated flour having higher protein content and WG showed also higher score. Thus, treatment of wheat flour with N-fertilization and γ-irradiation may improve the quality of Korean-style noodles during storage.
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Affiliation(s)
- Na-Young Lee
- Department of Food Science and Biotechnology, Kunsan National University, Gunsan, Jeonbuk, 54150 Korea
| | - Chon-Sik Kang
- National Institute of Crop Science (NICS), RDA, Jeonju, Jeonbuk, 54875 Korea
| | - Hak-Sin Kim
- National Institute of Crop Science (NICS), RDA, Jeonju, Jeonbuk, 54875 Korea
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8
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Hopkins JB, Thorne RE. Quantifying radiation damage in biomolecular small-angle X-ray scattering. J Appl Crystallogr 2016; 49:880-890. [PMID: 27275138 PMCID: PMC4886981 DOI: 10.1107/s1600576716005136] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/25/2016] [Indexed: 11/10/2022] Open
Abstract
Small-angle X-ray scattering (SAXS) is an increasingly popular technique that provides low-resolution structural information about biological macromolecules in solution. Many of the practical limitations of the technique, such as minimum required sample volume, and of experimental design, such as sample flow cells, are necessary because the biological samples are sensitive to damage from the X-rays. Radiation damage typically manifests as aggregation of the sample, which makes the collected data unreliable. However, there has been little systematic investigation of the most effective methods to reduce damage rates, and results from previous damage studies are not easily compared with results from other beamlines. Here a methodology is provided for quantifying radiation damage in SAXS to provide consistent results between different experiments, experimenters and beamlines. These methods are demonstrated on radiation damage data collected from lysozyme, glucose isomerase and xylanase, and it is found that no single metric is sufficient to describe radiation damage in SAXS for all samples. The radius of gyration, molecular weight and integrated SAXS profile intensity constitute a minimal set of parameters that capture all types of observed behavior. Radiation sensitivities derived from these parameters show a large protein dependence, varying by up to six orders of magnitude between the different proteins tested. This work should enable consistent reporting of radiation damage effects, allowing more systematic studies of the most effective minimization strategies.
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Affiliation(s)
| | - Robert E. Thorne
- Department of Physics, Cornell University, Ithaca, NY 14853, USA
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9
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Caffeic Acid-PLGA Conjugate to Design Protein Drug Delivery Systems Stable to Irradiation. J Funct Biomater 2015; 6:1-13. [PMID: 25569163 PMCID: PMC4384096 DOI: 10.3390/jfb6010001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Accepted: 12/24/2014] [Indexed: 11/23/2022] Open
Abstract
This work reports the feasibility of caffeic acid grafted PLGA (g-CA-PLGA) to design biodegradable sterile microspheres for the delivery of proteins. Ovalbumin (OVA) was selected as model compound because of its sensitiveness of γ-radiation. The adopted grafting procedure allowed us to obtain a material with good free radical scavenging properties, without a significant modification of Mw and Tg of the starting PLGA (Mw PLGA = 26.3 ± 1.3 kDa vs.Mw g-CA-PLGA = 22.8 ± 0.7 kDa; Tg PLGA = 47.7 ± 0.8 °C vs.Tg g-CA-PLGA = 47.4 ± 0.2 °C). By using a W1/O/W2 technique, g-CA-PLGA improved the encapsulation efficiency (EE), suggesting that the presence of caffeic residues improved the compatibility between components (EEPLGA = 35.0% ± 0.7% vs.EEg-CA-PLGA = 95.6% ± 2.7%). Microspheres particle size distribution ranged from 15 to 50 µm. The zeta-potential values of placebo and loaded microspheres were −25 mV and −15 mV, respectively. The irradiation of g-CA-PLGA at the dose of 25 kGy caused a less than 1% variation of Mw and the degradation patterns of the non-irradiated and irradiated microspheres were superimposable. The OVA content in g-CA-PLGA microspheres decreased to a lower extent with respect to PLGA microspheres. These results suggest that g-CA-PLGA is a promising biodegradable material to microencapsulate biological drugs.
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10
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Kouass Sahbani S, Klarskov K, Aloui A, Kouass S, Landoulsi A. Protective role of ascorbic acid in the decontamination of cow milk casein by gamma-irradiation. Int J Radiat Biol 2013; 89:411-5. [PMID: 23362934 DOI: 10.3109/09553002.2013.767995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
PURPOSE The aim of this work was to investigate the protective role of ascorbic acid on irradiation-induced modification of casein. MATERIALS AND METHODS Casein stock solutions were irradiated with increasing doses 2-10 kGy using (60)Co Gamma rays at a dose rate D• = 136.73 Gy/min at room temperature. The total viable microorganism content of cow milk casein was evaluated by Plate Count Agar (PCA) incubation for 48 h at 37°C. Sodium dodecylsulfate gel electrophoresis (SDS-PAGE) and Matrix-Assisted Laser Desorption-Ionization Time-of-Flight mass spectrometry (MALDI-TOF-MS) analysis were used to evaluate the effect of gamma irradiation on casein integrity. RESULTS Gamma irradiation reduced the bacterial contamination of casein solutions at a lower irradiation dose when performed in the presence of ascorbic acid. The irradiation treatment of casein in the absence of ascorbic acid with a dose of 4 kGy could reduce 99% of the original amount of bacterial colonies. However, in the presence of ascorbic acid the irradiation treatment of casein with a dose lower than 2 kGy could reduce 99% of the original amount of bacterial colonies which suggested that the irradiation dose lower than 2 kGy achieved almost the entire decontamination result. SDS-PAGE and MALDI-TOF-MS analysis showed that ascorbic acid protected cow milk casein from degradation and subsequent aggregation probably by scavenging oxygen and protein radicals produced by the irradiation. CONCLUSIONS It is demonstrated that the combination of gamma irradiation and ascorbic acid produce additive effects, providing acceptable hygienic quality of cow milk casein and protects caseins against Reactive Oxygen Species (ROS) generated, during the irradiation process.
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Affiliation(s)
- Saloua Kouass Sahbani
- Unité de recherche de Biochimie des lipides et interactions avec les macromolecules, Laboratoire de Biochimie et de Biologie moléculaire, Faculté des sciences de Bizerte, Zarzouna, Tunisia.
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11
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Kuan YH, Bhat R, Patras A, Karim AA. Radiation processing of food proteins – A review on the recent developments. Trends Food Sci Technol 2013. [DOI: 10.1016/j.tifs.2012.12.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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12
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Allan EG, Kander MC, Carmichael I, Garman EF. To scavenge or not to scavenge, that is STILL the question. JOURNAL OF SYNCHROTRON RADIATION 2013; 20:23-36. [PMID: 23254653 PMCID: PMC3526919 DOI: 10.1107/s0909049512046237] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 11/08/2012] [Indexed: 05/23/2023]
Abstract
An extensive radiation chemistry literature would suggest that the addition of certain radical scavengers might mitigate the effects of radiation damage during protein crystallography diffraction data collection. However, attempts to demonstrate and quantify such an amelioration and its dose dependence have not yielded consistent results, either at room temperature (RT) or 100 K. Here the information thus far available is summarized and reasons for this lack of quantitative success are identified. Firstly, several different metrics have been used to monitor and quantify the rate of damage, and, as shown here, these can give results which are in conflict regarding scavenger efficacy. In addition, significant variation in results from data collected from crystals treated in nominally the same way has been observed. Secondly, typical crystallization conditions contain substantial concentrations of chemical species which already interact strongly with some of the X-ray-induced radicals that the added scavengers are intended to intercept. These interactions are probed here by the complementary technique of on-line microspectrophotometry carried out on solutions and crystals held both at 100 K and RT, the latter enabled by the use of a beamline-mounted humidifying device. With the help of computational chemistry, attempts are made to assign some of the characteristic spectral features observed experimentally. A further source of uncertainty undoubtedly lies in the challenge of reliably measuring the parameters necessary for the accurate calculation of the absorbed dose (e.g. crystal size and shape, beam profile) and its distribution within the volume of the crystal (an issue addressed in detail in another article in this issue). While microspectrophotometry reveals that the production of various species can be quenched by the addition of scavengers, it is less clear that this observation can be translated into a significant gain in crystal dose tolerance for macromolecular crystallographers.
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Affiliation(s)
- Elizabeth G. Allan
- Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Melissa C. Kander
- Notre Dame Radiation Laboratory, and Department of Chemistry and Biochemistry, University of Notre Dame, IN 46556, USA
| | - Ian Carmichael
- Notre Dame Radiation Laboratory, and Department of Chemistry and Biochemistry, University of Notre Dame, IN 46556, USA
| | - Elspeth F. Garman
- Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
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Morgan PE, Pattison DI, Davies MJ. Quantification of hydroxyl radical-derived oxidation products in peptides containing glycine, alanine, valine, and proline. Free Radic Biol Med 2012; 52:328-39. [PMID: 22064365 DOI: 10.1016/j.freeradbiomed.2011.10.448] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 10/11/2011] [Accepted: 10/17/2011] [Indexed: 01/22/2023]
Abstract
Proteins are a major target for oxidation due to their abundance and high reactivity. Despite extensive investigation over many years, only limited quantitative data exist on the contributions of different pathways to the oxidation of peptides and proteins. This study was designed to obtain quantitative data on the nature and yields of oxidation products (alcohols, carbonyls, hydroperoxides, fragment species) formed by a prototypic oxidant system (HO(•)/O(2)) on small peptides of limited, but known, amino acid composition. Peptides composed of Gly, Ala, Val, and Pro were examined with particular emphasis on the peptide Val-Gly-Val-Ala-Pro-Gly, a repeat motif in elastin with chemotactic activity and metalloproteinase regulation properties. The data obtained indicate that hydroperoxide formation occurs nonrandomly (Pro > Val > Ala > Gly) with this inversely related to carbonyl yields (both peptide-bound and released). Multiple alcohols are generated at both side-chain and backbone sites. Backbone fragmentation has been characterized at multiple positions, with sites adjacent to Pro residues being of major importance. Summation of the product concentrations provides clear evidence for the occurrence of chain reactions in peptides exposed to HO(•)/O(2), with the overall product yields exceeding that of the initial HO(•) generated.
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Affiliation(s)
- Philip E Morgan
- Free Radical Group, The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW 2042, Australia.
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Kmetko J, Warkentin M, Englich U, Thorne RE. Can radiation damage to protein crystals be reduced using small-molecule compounds? ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2011; 67:881-93. [PMID: 21931220 PMCID: PMC3176623 DOI: 10.1107/s0907444911032835] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Accepted: 08/12/2011] [Indexed: 11/10/2022]
Abstract
Recent studies have defined a data-collection protocol and a metric that provide a robust measure of global radiation damage to protein crystals. Using this protocol and metric, 19 small-molecule compounds (introduced either by cocrystallization or soaking) were evaluated for their ability to protect lysozyme crystals from radiation damage. The compounds were selected based upon their ability to interact with radiolytic products (e.g. hydrated electrons, hydrogen, hydroxyl and perhydroxyl radicals) and/or their efficacy in protecting biological molecules from radiation damage in dilute aqueous solutions. At room temperature, 12 compounds had no effect and six had a sensitizing effect on global damage. Only one compound, sodium nitrate, appeared to extend crystal lifetimes, but not in all proteins and only by a factor of two or less. No compound provided protection at T=100 K. Scavengers are ineffective in protecting protein crystals from global damage because a large fraction of primary X-ray-induced excitations are generated in and/or directly attack the protein and because the ratio of scavenger molecules to protein molecules is too small to provide appreciable competitive protection. The same reactivity that makes some scavengers effective radioprotectors in protein solutions may explain their sensitizing effect in the protein-dense environment of a crystal. A more productive focus for future efforts may be to identify and eliminate sensitizing compounds from crystallization solutions.
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Affiliation(s)
- Jan Kmetko
- Physics Department, Kenyon College, Gambier, OH 43022, USA
| | | | - Ulrich Englich
- Cornell High Energy Synchrotron Source (CHESS), Cornell University, Ithaca, NY 14853, USA
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16
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Sterilization and protection of protein in combinations of Camellia sinensis green tea extract and gamma irradiation. Int J Biol Macromol 2011; 48:452-8. [DOI: 10.1016/j.ijbiomac.2011.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 12/18/2010] [Accepted: 01/04/2011] [Indexed: 01/16/2023]
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17
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Ham J, Jeong S, Lee S, Han G, Chae H, Yoo Y, Kim D, Lee W, Jo C. Irradiation effect on α- and β-caseins of milk and Queso Blanco cheese determined by capillary electrophoresis. Radiat Phys Chem Oxf Engl 1993 2009. [DOI: 10.1016/j.radphyschem.2008.09.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Lee JW, Seo JH, Kim JH, Lee SY, Byun MW. Comparison of the changes of the antigenicities of a hen's egg albumin by a gamma and an electron beam irradiation. Radiat Phys Chem Oxf Engl 1993 2007. [DOI: 10.1016/j.radphyschem.2006.06.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Sionkowska A. Thermal stability of UV-irradiated collagen in bovine lens capsules and in bovine cornea. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2005; 80:87-92. [PMID: 16038807 DOI: 10.1016/j.jphotobiol.2005.03.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2005] [Revised: 03/11/2005] [Accepted: 03/16/2005] [Indexed: 11/15/2022]
Abstract
The thermal stability of UVB irradiated collagen in bovine lens capsules and in bovine cornea has been investigated by differential scanning calorimetry (DSC). During UVB irradiation the lens capsules and cornea were immersed in water to keep the collagen in a fully hydrated condition at all times. UV irradiation induced changes in collagen which caused both stabilization and destabilization of the collagen structure. The helix-coil transition for non-irradiated collagen in cornea occurred near 66 degrees C, instead for the irradiated one for 3h it occurred at 69 degrees C. After irradiating for longer times (20-96h) the helix-coil transition peak occurred at much lower temperatures. The peak was very broad and suggested that collagen was reduced by UV to different polypeptides of different molecular weight and different lower thermal stabilities. The irradiation of lens capsules with UVB light in vitro resulted in changes in the thermal properties of type-IV collagen consistent with increased cross-linking. DSC of lens capsules showed two major peaks at melting temperatures at 54 degrees C Tm1 and 78 degrees C Tm2, which can be attributed to the denaturation of the triple helix and 7S domains, respectively. UVB irradiation of lens capsules in vitro for 6 h caused an increase in Tm1 from 54 to 57 degrees C. The higher temperature required to denature the type-IV collagen after irradiation in vitro suggested an increase of intermolecular cross-linking.
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Affiliation(s)
- Alina Sionkowska
- Faculty of Chemistry, Nicolaus Copernicus University, 7 Gagarin, 87-100 Torun, Poland.
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Bataille C, Baldacchino G, Cosson RP, Coppo M, Trehen C, Vigneron G, Renault JP, Pin S. Effect of pressure on pulse radiolysis reduction of proteins. Biochim Biophys Acta Gen Subj 2005; 1724:432-9. [PMID: 15953680 DOI: 10.1016/j.bbagen.2005.04.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2005] [Revised: 04/19/2005] [Accepted: 04/21/2005] [Indexed: 11/24/2022]
Abstract
Pulse radiolysis experiments were performed on proteins under pressure. Whereas many spectroscopic techniques have shown protein modifications at different pressure ranges, the present measurements performed using the water radiolysis allowed to generate radical species and to study the mechanisms implied in their reactions with proteins. This work gives the first results obtained on the effects of pressure on the rate constants of the proteins reduction by the hydrated electron at pressures up to 100 MPa. The reaction with the hydrated electron was investigated on two classes of protein: the horse myoglobin and the mussel metallothioneins. We have successively studied the influence of the pH value of metmyoglobin solutions (pH 6, 7 and 8) and the influence of the metals nature (Zn,Cu,Cd) bound to metallothioneins. For both protein, whatever the experimental conditions, the pressure does not influence the value of the reduction rate constant in the investigated range (0.1-100 MPa).
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Affiliation(s)
- Céline Bataille
- Laboratoire Claude Fréjacques (URA 331 CEA/CNRS), DSM/DRECAM/Service de Chimie Moléculaire, CEA Saclay, 91191-Gif sur Yvette cedex, France
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