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Mohammadi B, Raudner R, Shafiq M, Ahn E, Altmeppen HC, Glatzel M. Influence of Methanol on Prion Reduction during High Temperature and High Pressure Oleochemical Processes. EUR J LIPID SCI TECH 2020. [DOI: 10.1002/ejlt.202000136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Behnam Mohammadi
- Institute of Neuropathology University Medical Center Hamburg‐Eppendorf (UKE) Martinistrasse 52 20246 Hamburg Germany
| | - Robert Raudner
- BDI‐BioEnergy International GmbH Parkring 18 8074 Raaba‐Grambach Austria
| | - Mohsin Shafiq
- Institute of Neuropathology University Medical Center Hamburg‐Eppendorf (UKE) Martinistrasse 52 20246 Hamburg Germany
| | - Edgar Ahn
- BDI‐BioEnergy International GmbH Parkring 18 8074 Raaba‐Grambach Austria
| | - Hermann C. Altmeppen
- Institute of Neuropathology University Medical Center Hamburg‐Eppendorf (UKE) Martinistrasse 52 20246 Hamburg Germany
| | - Markus Glatzel
- Institute of Neuropathology University Medical Center Hamburg‐Eppendorf (UKE) Martinistrasse 52 20246 Hamburg Germany
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2
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Khan MV, Ishtikhar M, Rabbani G, Zaman M, Abdelhameed AS, Khan RH. Polyols (Glycerol and Ethylene glycol) mediated amorphous aggregate inhibition and secondary structure restoration of metalloproteinase-conalbumin (ovotransferrin). Int J Biol Macromol 2016; 94:290-300. [PMID: 27744055 PMCID: PMC7112414 DOI: 10.1016/j.ijbiomac.2016.10.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 10/10/2016] [Indexed: 11/24/2022]
Abstract
Conalbumin aggregates at 65 °C and denaturation occur at above this temperature. The nature of aggregates was identified as amorphous. The polyols inhibits the aggregation of conalbumin via protecting the secondary structure. Glycerol is found to be more protective than ethylene glycol.
Under physical or chemical stress, proteins tend to form aggregates either highly ordered (amyloid) or unordered (amorphous) causing many pathological disorders in human and loss of proteins functionality in both laboratory conditions and industries during production and storage at commercial level. We investigated the effect of increasing temperature on Conalbumin (CA) and induced aggregation at 65 °C. The enhanced Thioflavin T (ThT) and ANS (1-anilinonaphtalene 8-sulfonic acid) fluorescence intensity, show no shift on Congo red binding, additionally, transmission and scanning electron microscopy (TEM) (SEM) reveal amorphous morphology of the aggregate. Our investigation clearly demonstrated that polyols namely Glycerol (GL) and Ethylene glycol (EG) are so staunch to inhibit amorphous aggregates via restoring secondary conformation. Addition of polyols (15% GL and 35% EG) significantly decrease the turbidity, Rayleigh scattering ThT and ANS fluorescence intensity. The dynamic light scattering (DLS) data show that hydrodynamic radii (Rh) of the aggregates is ∼20 times higher than native CA while nearly similar for GL and EG protected CA due to condensation of core size with little difference.
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Affiliation(s)
- Mohsin Vahid Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Mohd Ishtikhar
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Gulam Rabbani
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Masihuz Zaman
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Ali Saber Abdelhameed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Rizwan Hasan Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India.
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Terry C, Wenborn A, Gros N, Sells J, Joiner S, Hosszu LLP, Tattum MH, Panico S, Clare DK, Collinge J, Saibil HR, Wadsworth JDF. Ex vivo mammalian prions are formed of paired double helical prion protein fibrils. Open Biol 2016; 6:rsob.160035. [PMID: 27249641 PMCID: PMC4892434 DOI: 10.1098/rsob.160035] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 04/13/2016] [Indexed: 12/20/2022] Open
Abstract
Mammalian prions are hypothesized to be fibrillar or amyloid forms of prion protein (PrP), but structures observed to date have not been definitively correlated with infectivity and the three-dimensional structure of infectious prions has remained obscure. Recently, we developed novel methods to obtain exceptionally pure preparations of prions from mouse brain and showed that pathogenic PrP in these high-titre preparations is assembled into rod-like assemblies. Here, we have used precise cell culture-based prion infectivity assays to define the physical relationship between the PrP rods and prion infectivity and have used electron tomography to define their architecture. We show that infectious PrP rods isolated from multiple prion strains have a common hierarchical assembly comprising twisted pairs of short fibres with repeating substructure. The architecture of the PrP rods provides a new structural basis for understanding prion infectivity and can explain the inability to systematically generate high-titre synthetic prions from recombinant PrP.
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Affiliation(s)
- Cassandra Terry
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Adam Wenborn
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Nathalie Gros
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Jessica Sells
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Susan Joiner
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Laszlo L P Hosszu
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - M Howard Tattum
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Silvia Panico
- Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - Daniel K Clare
- Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - John Collinge
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
| | - Helen R Saibil
- Institute of Structural and Molecular Biology, Department of Biological Sciences, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
| | - Jonathan D F Wadsworth
- MRC Prion Unit and Department of Neurodegenerative Disease, UCL Institute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London WC1N 3BG, UK
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4
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Scientific Opinion on a continuous multiple‐step catalytic hydro‐treatment for the processing of rendered animal fat (Category 1). EFSA J 2015. [DOI: 10.2903/j.efsa.2015.4307] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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5
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Müller H, Brener O, Andreoletti O, Piechatzek T, Willbold D, Legname G, Heise H. Progress towards structural understanding of infectious sheep PrP-amyloid. Prion 2015; 8:344-58. [PMID: 25482596 PMCID: PMC4601355 DOI: 10.4161/19336896.2014.983754] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The still elusive structural difference of non-infectious and infectious amyloid of the mammalian prion protein (PrP) is a major pending milestone in understanding protein-mediated infectivity in neurodegenerative diseases. Preparations of PrP-amyloid proven to be infectious have never been investigated with a high-resolution technique. All available models to date have been based on low-resolution data. Here, we establish protocols for the preparation of infectious samples of full-length recombinant (rec) PrP-amyloid in NMR-sufficient amounts by spontaneous fibrillation and seeded fibril growth from brain extract. We link biological and structural data of infectious recPrP-amyloid, derived from bioassays, atomic force microscopy, and solid-state NMR spectroscopy. Our data indicate a semi-mobile N-terminus, some residues with secondary chemical shifts typical of α-helical secondary structure in the middle part between ∼115 to ∼155, and a distinct β-sheet core C-terminal of residue ∼155. These findings are not in agreement with all current models for PrP-amyloid. We also provide evidence that samples seeded from brain extract may not differ in the overall arrangement of secondary structure elements, but rather in the flexibility of protein segments outside the β-core region. Taken together, our protocols provide an essential basis for the high-resolution characterization of non-infectious and infectious PrP-amyloid in the near future.
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Affiliation(s)
- Henrik Müller
- a Institute of Complex Systems; ICS-6: Structural Biochemistry; Forschungszentrum Jülich (FZJ) ; Jülich , Germany
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Leunda A, Van Vaerenbergh B, Baldo A, Roels S, Herman P. Laboratory activities involving transmissible spongiform encephalopathy causing agents: risk assessment and biosafety recommendations in Belgium. Prion 2013; 7:420-33. [PMID: 24055928 PMCID: PMC3904386 DOI: 10.4161/pri.26533] [Citation(s) in RCA: 7] [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: 08/05/2013] [Revised: 09/13/2013] [Accepted: 09/18/2013] [Indexed: 11/19/2022] Open
Abstract
Since the appearance in 1986 of epidemic of bovine spongiform encephalopathy (BSE), a new form of neurological disease in cattle which also affected human beings, many diagnostic and research activities have been performed to develop detection and therapeutic tools. A lot of progress was made in better identifying, understanding and controlling the spread of the disease by appropriate monitoring and control programs in European countries. This paper reviews the recent knowledge on pathogenesis, transmission and persistence outside the host of prion, the causative agent of transmissible spongiform encephalopathies (TSE) in mammals with a particular focus on risk (re)assessment and management of biosafety measures to be implemented in diagnostic and research laboratories in Belgium. Also, in response to the need of an increasing number of European diagnostic laboratories stopping TSE diagnosis due to a decreasing number of TSE cases reported in the last years, decontamination procedures and a protocol for decommissioning TSE diagnostic laboratories is proposed.
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Affiliation(s)
- Amaya Leunda
- Biosafety and Biotechnology Unit; Institut Scientifique de Santé Publique; Brussels, Belgium
| | | | - Aline Baldo
- Biosafety and Biotechnology Unit; Institut Scientifique de Santé Publique; Brussels, Belgium
| | - Stefan Roels
- Orientation and Veterinary Support; National Reference Laboratory for TSE (Belgium & Luxemburg); Veterinary and Agrochemical Research Center; Brussels, Belgium
| | - Philippe Herman
- Biosafety and Biotechnology Unit; Institut Scientifique de Santé Publique; Brussels, Belgium
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Yoshioka M, Matsuura Y, Okada H, Shimozaki N, Yamamura T, Murayama Y, Yokoyama T, Mohri S. Rapid assessment of bovine spongiform encephalopathy prion inactivation by heat treatment in yellow grease produced in the industrial manufacturing process of meat and bone meals. BMC Vet Res 2013; 9:134. [PMID: 23835086 PMCID: PMC3710282 DOI: 10.1186/1746-6148-9-134] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 07/03/2013] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Prions, infectious agents associated with transmissible spongiform encephalopathy, are primarily composed of the misfolded and pathogenic form (PrPSc) of the host-encoded prion protein. Because PrPSc retains infectivity after undergoing routine sterilizing processes, the cause of bovine spongiform encephalopathy (BSE) outbreaks are suspected to be feeding cattle meat and bone meals (MBMs) contaminated with the prion. To assess the validity of prion inactivation by heat treatment in yellow grease, which is produced in the industrial manufacturing process of MBMs, we pooled, homogenized, and heat treated the spinal cords of BSE-infected cows under various experimental conditions. RESULTS Prion inactivation was analyzed quantitatively in terms of the infectivity and PrPSc of the treated samples. Following treatment at 140°C for 1 h, infectivity was reduced to 1/35 of that of the untreated samples. Treatment at 180°C for 3 h was required to reduce infectivity. However, PrPSc was detected in all heat-treated samples by using the protein misfolding cyclic amplification (PMCA) technique, which amplifies PrPScin vitro. Quantitative analysis of the inactivation efficiency of BSE PrPSc was possible with the introduction of the PMCA50, which is the dilution ratio of 10% homogenate needed to yield 50% positivity for PrPSc in amplified samples. CONCLUSIONS Log PMCA50 exhibited a strong linear correlation with the transmission rate in the bioassay; infectivity was no longer detected when the log PMCA50 of the inoculated sample was reduced to 1.75. The quantitative PMCA assay may be useful for safety evaluation for recycling and effective utilization of MBMs as an organic resource.
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8
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Matsuura Y, Ishikawa Y, Bo X, Murayama Y, Yokoyama T, Somerville RA, Kitamoto T, Mohri S. Quantitative analysis of wet-heat inactivation in bovine spongiform encephalopathy. Biochem Biophys Res Commun 2013; 432:86-91. [DOI: 10.1016/j.bbrc.2013.01.081] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 01/12/2013] [Indexed: 01/30/2023]
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Current limitations about the cleaning of luminal endoscopes. J Hosp Infect 2012; 83:22-9. [PMID: 23098682 DOI: 10.1016/j.jhin.2012.08.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 08/22/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND The presence and potential build-up of patient material such as proteins in endoscope lumens can have significant implications, including toxic reactions, device damage, inadequate disinfection/sterilization, increased risk of biofilm development and potential transmission of pathogens. AIM To evaluate potential protein deposition and removal in the channels of flexible luminal endoscopes during a simple contamination/cleaning cycle. METHODS The level of contamination present on disposable endoscopy forceps which come into contact with the lumen of biopsy channels was evaluated. Following observations in endoscopy units, factors influencing protein adsorption inside luminal endoscope channels and the action of current initial cleaning techniques were evaluated using a proteinaceous test soil and very sensitive fluorescence epimicroscopy. FINDINGS Disposable endoscope accessories appear to be likely to contribute to the contamination of lumens, and were useful indicators of the amount of proteinaceous soil transiting through the channels of luminal endoscopes. Enzymatic cleaning according to the manufacturer's recommendations and brushing of the channels were ineffective at removing all proteinaceous residues from new endoscope channels after a single contamination. Rinsing immediately after contamination only led to a slight improvement in decontamination outcome. CONCLUSION Limited action of current decontamination procedures and the lack of applicable quality control methods to assess the cleanliness of channels between patients contribute to increasing the risk of cross-infection of potentially harmful micro-organisms and molecules during endoscopy procedures.
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Isolation of phosphatidylethanolamine as a solitary cofactor for prion formation in the absence of nucleic acids. Proc Natl Acad Sci U S A 2012; 109:8546-51. [PMID: 22586108 DOI: 10.1073/pnas.1204498109] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Infectious prions containing the pathogenic conformer of the mammalian prion protein (PrP(Sc)) can be produced de novo from a mixture of the normal conformer (PrP(C)) with RNA and lipid molecules. Recent reconstitution studies indicate that nucleic acids are not required for the propagation of mouse prions in vitro, suggesting the existence of an alternative prion propagation cofactor in brain tissue. However, the identity and functional properties of this unique cofactor are unknown. Here, we show by purification and reconstitution that the molecule responsible for the nuclease-resistant cofactor activity in brain is endogenous phosphatidylethanolamine (PE). Synthetic PE alone facilitates conversion of purified recombinant (rec)PrP substrate into infectious recPrP(Sc) molecules. Other phospholipids, including phosphatidylcholine, phosphatidylserine, phosphatidylinositol, and phosphatidylglycerol, were unable to facilitate recPrP(Sc) formation in the absence of RNA. PE facilitated the propagation of PrP(Sc) molecules derived from all four different animal species tested including mouse, suggesting that unlike RNA, PE is a promiscuous cofactor for PrP(Sc) formation in vitro. Phospholipase treatment abolished the ability of brain homogenate to reconstitute the propagation of both mouse and hamster PrP(Sc) molecules. Our results identify a single endogenous cofactor able to facilitate the formation of prions from multiple species in the absence of nucleic acids or other polyanions.
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Abstract
The discovery of infectious proteins, denoted prions, was unexpected. After much debate over the chemical basis of heredity, resolution of this issue began with the discovery that DNA, not protein, from pneumococcus was capable of genetically transforming bacteria (Avery et al. 1944). Four decades later, the discovery that a protein could mimic viral and bacterial pathogens with respect to the transmission of some nervous system diseases (Prusiner 1982) met with great resistance. Overwhelming evidence now shows that Creutzfeldt-Jakob disease (CJD) and related disorders are caused by prions. The prion diseases are characterized by neurodegeneration and lethality. In mammals, prions reproduce by recruiting the normal, cellular isoform of the prion protein (PrP(C)) and stimulating its conversion into the disease-causing isoform (PrP(Sc)). PrP(C) and PrP(Sc) have distinct conformations: PrP(C) is rich in α-helical content and has little β-sheet structure, whereas PrP(Sc) has less α-helical content and is rich in β-sheet structure (Pan et al. 1993). The conformational conversion of PrP(C) to PrP(Sc) is the fundamental event underlying prion diseases. In this article, we provide an introduction to prions and the diseases they cause.
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Affiliation(s)
- David W Colby
- Institute for Neurodegenerative Diseases, University of California, San Francisco, San Francisco, California 94143, USA
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Rogez-Kreuz C, Yousfi R, Soufflet C, Quadrio I, Yan ZX, Huyot V, Aubenque C, Destrez P, Roth K, Roberts C, Favero M, Clayette P. Inactivation of animal and human prions by hydrogen peroxide gas plasma sterilization. Infect Control Hosp Epidemiol 2009; 30:769-77. [PMID: 19563265 DOI: 10.1086/598342] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Prions cause various transmissible spongiform encephalopathies. They are highly resistant to the chemical and physical decontamination and sterilization procedures routinely used in healthcare facilities. The decontamination procedures recommended for the inactivation of prions are often incompatible with the materials used in medical devices. In this study, we evaluated the use of low-temperature hydrogen peroxide gas plasma sterilization systems and other instrument-processing procedures for inactivating human and animal prions. We provide new data concerning the efficacy of hydrogen peroxide against prions from in vitro or in vivo tests, focusing on the following: the efficiency of hydrogen peroxide sterilization and possible interactions with enzymatic or alkaline detergents, differences in the efficiency of this treatment against different prion strains, and the influence of contaminating lipids. We found that gaseous hydrogen peroxide decreased the infectivity of prions and/or the level of the protease-resistant form of the prion protein on different surface materials. However, the efficiency of this treatment depended strongly on the concentration of hydrogen peroxide and the delivery system used in medical devices, because these effects were more pronounced for the new generation of Sterrad technology. The Sterrad NX sterilizer is 100% efficient (0% transmission and no protease-resistant form of the prion protein signal detected on the surface of the material for the mouse-adapted bovine spongiform encephalopathy 6PB1 strain and a variant Creutzfeldt-Jakob disease strain). Thus, gaseous or vaporized hydrogen peroxide efficiently inactivates prions on the surfaces of medical devices.
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Ku SH, Park CB. Highly accelerated self-assembly and fibrillation of prion peptides on solid surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13822-13827. [PMID: 19053635 DOI: 10.1021/la802931k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The conformational change of cellular prion protein (PrP(C)) to its infectious isoform (PrP(Sc)) is a hallmark of prion diseases. We have developed a novel solid surface-based system for efficient prion fibrillation in vitro by immobilizing prion peptides onto a chemically activated solid surface. The self-assembly of prion peptides into fibrils was more highly accelerated on the solid surface than in solution after 72 h of incubation at 37 degrees C. According to our observation using ex situ atomic force microscopy, fibrils were over 200 nm long and 5-8 nm in diameter. Amyloid-like properties of fibrils self-assembled on the solid surface were confirmed by multiple analyses with circular dichroism and amyloid-specific dyes such as Congo red and thioflavin T. The fibril formation of prion peptides was substantially affected by the incubation temperature, and preformed fibrils disassembled after additional heat treatment at 100 Odegrees . The solid surface-based prion fibrillation system developed in the present work may become a useful tool for the in vitro study of prion aggregation. The adoption of this system will allow the efficient investigation of environmental factors and inhibitor screening.
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Affiliation(s)
- Sook Hee Ku
- Institute for the BioCentury and Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, Republic of Korea
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Panza G, Stöhr J, Dumpitak C, Papathanassiou D, Weiss J, Riesner D, Willbold D, Birkmann E. Spontaneous and BSE-prion-seeded amyloid formation of full length recombinant bovine prion protein. Biochem Biophys Res Commun 2008; 373:493-7. [PMID: 18585368 DOI: 10.1016/j.bbrc.2008.06.059] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2008] [Accepted: 06/12/2008] [Indexed: 11/18/2022]
Abstract
The conversion of the cellular isoform of the prion protein into the pathogenic isoform PrP(Sc) is the key event in prion diseases. The disease can occur spontaneously genetically or by infection. In earlier studies we presented an in vitro conversion system which simulates the structural transition in recPrP by varying low concentrations of SDS at constant NaCl. In the present study we adopted the conversion system from experimental Scrapie in hamster to bovine recPrP and generated amyloid fibrils. The intermediate state which is optimal for fibril formation is a soluble, beta-rich state. The system was extended using BSE-prions as seeds and led to an acceleration of fibril formation by orders of magnitude. This seeded amyloid formation assay avoids any PK-treatment, is therefore able to detect even PK-sensitive PrP(Sc) and does not require cellular components.
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Affiliation(s)
- Giannantonio Panza
- Institut fuer Physikalische Biologie and Biologisch-Medizinisches Forschungszentrum, Heinrich-Heine-Universitaet Duesseldorf, Universitiätsstr. 1, 40225 Duesseldorf, Germany
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15
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Müller H, Stitz L, Riesner D. Prion decontamination during the oleochemical process of fat hydrogenation. EUR J LIPID SCI TECH 2008. [DOI: 10.1002/ejlt.200700171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Henrik Müller
- Institut für Physikalische Biologie, Heinrich‐Heine‐Universität Düsseldorf, Düsseldorf, Germany
| | - Lothar Stitz
- Institut für Immunologie, Friedrich‐Loeffler‐Institut (FLI), Bundesforschungsinstitut für Tiergesundheit, Tübingen, Germany
| | - Detlev Riesner
- Institut für Physikalische Biologie, Heinrich‐Heine‐Universität Düsseldorf, Düsseldorf, Germany
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