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Al-Shabib NA, Khan JM, Malik A, Alamri A, Rehman MT, AlAjmi MF, Husain FM. Probing the interaction mechanisms between sunset yellow dye and trypsin protein leading to amorphous aggregation under low pH conditions. Int J Biol Macromol 2024; 265:130442. [PMID: 38417745 DOI: 10.1016/j.ijbiomac.2024.130442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 02/20/2024] [Accepted: 02/23/2024] [Indexed: 03/01/2024]
Abstract
Protein aggregation poses a significant concern in the field of food sciences, and various factors, such as synthetic food dyes, can contribute to protein aggregation. One such dye, Sunset Yellow (SY), is commonly employed in the food industry. Trypsin was used as a model protein to assess the impact of SY. We employed several biophysical techniques to examine the binding and aggregation mechanisms between SY and trypsin at different pHs. Results from intrinsic fluorescence measurements indicate a stronger interaction between SY and trypsin at pH 2.0 compared to pH 6.0. Turbidity data reveal trypsin aggregation in the presence of 0.05-3.0 mM SY at pH 2.0, while no aggregation was observed at pH 6.0. Kinetic data demonstrate a rapid, lag-phase-free SY-induced aggregation of trypsin. Circular dichroism analysis reveals that trypsin adopts a secondary structure in the presence of SY at pH 6.0, whereas at pH 2.0, the secondary structure was nearly lost with increasing SY concentrations. Furthermore, turbidity and kinetics data suggest that trypsin aggregation depends on trypsin concentrations and pH. Our study highlights potential health risks associated with the consumption of SY, providing insights into its impact on human health and emphasizing the necessity for further research in this field.
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Affiliation(s)
- Nasser Abdulatif Al-Shabib
- Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia
| | - Javed Masood Khan
- Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
| | - Ajamaluddin Malik
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Abdulaziz Alamri
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Md Tabish Rehman
- King Saud University, Department of Pharmacognosy, College of Pharmacy, Riyadh 11451, Saudi Arabia
| | - Mohamed F AlAjmi
- King Saud University, Department of Pharmacognosy, College of Pharmacy, Riyadh 11451, Saudi Arabia
| | - Fohad Mabood Husain
- Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia
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Golam Kibria M, Akazawa-Ogawa Y, Hagihara Y, Kuroda Y. Immune response with long-term memory triggered by amorphous aggregates of misfolded anti-EGFR V HH-7D12 is directed against the native V HH-7D12 as well as the framework of the analogous V HH-9G8. Eur J Pharm Biopharm 2021; 165:13-21. [PMID: 33971271 DOI: 10.1016/j.ejpb.2021.05.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 04/29/2021] [Accepted: 05/03/2021] [Indexed: 02/06/2023]
Abstract
We previously demonstrated that amorphous aggregates of misfolded VHH-7D12 antibodies (VHH-Mis), a potential anti-EGFR drug, can generate a robust serum IgG response. Here we investigate the immunogenic nature, especially the specificity of the immune response induced by VHH-Mis. To this end, we used two natively folded and 77% identical anti-EGFR VHHs (VHH-7D12 and VHH-9G8) that possess a common framework but distinct complementarity determining regions (CDRs). In 60% of mice immunized with VHH-Mis, the anti-VHH-7D12 IgG titer was stronger than the anti-VHH-9G8 titer (Group-1). In the remaining mice (40%; Group-2), the anti-VHH-7D12 and anti-VHH-9G8 titer were almost identical. We rationalized these results by hypothesizing that mice in Group-1 produced IgG mostly against the VHH-7D12's CDRs, whereas in Group-2 mice, they targeted the VHH's framework. The IgG specificity against VHH-7D12 and VHH-9G8 was essentially unchanged over 17 weeks in both groups. Further, in all mice (Group-1&2) re-immunized with native VHH-7D12, the IgG titer against VHH-7D12 increased sharply but not against VHH-9G8. On the other hand, none of the three Group-1 mice re-immunized with native VHH-9G8 showed immunogenicity against VHH-7D12 nor VHH-9G8. Whereas, in Group-2 mice (three/three) re-immunized with VHH-9G8, the IgG titers against both VHHs increased but slowly. Flow-cytometric studies showed that VHH-Mis immunized mice generated a higher number of effector and central memory T-cells. Overall, these observations indicate that amorphous aggregates made of a misfolded VHH can induce serum IgG against its natively folded self and analogous VHHs having a similar framework but distinct CDRs. Furthermore, a robust long-term immune response with memory was established against its natively folded self but with a nil-to-moderate immune response against natively folded VHH analogs.
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Affiliation(s)
- Md Golam Kibria
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan
| | - Yoko Akazawa-Ogawa
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yoshihisa Hagihara
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yutaka Kuroda
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan.
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Ghadami SA, Ahmadi Z, Moosavi-Nejad Z. The albumin-based nanoparticle formation in relation to protein aggregation. Spectrochim Acta A Mol Biomol Spectrosc 2021; 252:119489. [PMID: 33524819 DOI: 10.1016/j.saa.2021.119489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 01/05/2021] [Accepted: 01/11/2021] [Indexed: 06/12/2023]
Abstract
Albumin is an attractive protein for the preparation of nanoparticle with possible therapeutic applications, due to its biodegradable, nontoxic, non-immunogenic, and metabolizable properties. Many studies have investigated the formation of albumin nanoparticles, generally by the desolvation or coacervation approaches. One of the most important parameters that should be considered in the formation of nanoparticles is their morphology (size and shape). There are many proposals to control the nanoparticle size, but it remains a challenge for researchers yet. In this study, we showed that control of BSA-based nanoparticles/microparticles size could be achieved by varying the temperature and pH and therefore controlling the rate of aggregation. The aggregation behavior was monitored by UV-Vis spectroscopy, SEM, and dye-binding assay. Our results provide more options for the size and shape control of BSA-based nanoparticle in natural buffer systems. The aggregation of BSA at different temperatures within the range of 50-80 °C were studied under the effect of different pHs in the range of 4.7-6.2. In this research, we found that protein aggregation under extreme conditions of pH and temperature, or at the pH near to pI appears to be amorphous, and at the pH above the pI seems to be the amyloid fibril structure. In some instances where the aggregation is neither too fast nor too slow, in the initial phase of the aggregation process, nanoparticle structures can be identified and separated by mechanistic approaches. This observation suggests that the best condition for monitoring the formation of albumin-based nanoparticles could be pH 5.7, 70 °C. Satisfactory rationalization of all aspects of our experimental observation requires further and more detailed study.
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Affiliation(s)
| | - Zahra Ahmadi
- Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran
| | - Zahra Moosavi-Nejad
- Department of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran.
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Kibria MG, Akazawa-Ogawa Y, Rahman N, Hagihara Y, Kuroda Y. The immunogenicity of an anti-EGFR single domain antibody (V HH) is enhanced by misfolded amorphous aggregation but not by heat-induced aggregation. Eur J Pharm Biopharm 2020; 152:164-174. [PMID: 32416134 DOI: 10.1016/j.ejpb.2020.05.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 05/07/2020] [Accepted: 05/10/2020] [Indexed: 11/30/2022]
Abstract
Amorphous aggregates of therapeutic proteins can provoke an unwanted immune response (anti-drug antibodies; ADAs), but counter-examples have led to some controversy. Amorphous aggregates can possess unique biophysical and biochemical attributes depending on both the way they are generated and the protein's biophysical/biochemical properties. Here, we examine the immunogenicity of an anti-EGFR single domain antibody (VHH) in four types of amorphous aggregates: two heat-aggregated VHH incubated at 65 °C (VHH-65) and 95 °C (VHH-95), a misfolded VHH isolated from the insoluble fraction of the E. coli lysate (VHH-Ins), and a low solubility misfolded VHH produced by miss-shuffling the SS bonds of the native VHH (VHH-Mis). Biophysical and biochemical measurements indicated that VHH was indeed natively folded, monomeric, and β-sheeted; that VHH-65 was partially unfolded and formed aggregates with a Z-average (Zave) of 771 nm; whereas VHH-95 was unfolded and formed aggregates of 1722 nm; and that both VHH-Ins and VHH-Mis were misfolded with non-native intermolecular SS bonds and formed aggregates with a Zave of 1846 nm and 1951 nm, respectively. The IgG level generated in Jcl:ICR mice determined by ELISA showed that the native VHH was barely immunogenic, VHH-95 was not immunogenic, while VHH-65 was mildly immunogenic. By contrast, the misfolded aggregates, VHH-Ins and VHH-Mis, having a Zave and an aggregation propensity similar to that of VHH-95, were highly immunogenic. These findings indicate the critical role of the biochemical and biophysical attributes of the amorphous aggregates in generating an immune response against a protein, rather than just their sizes.
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Affiliation(s)
- Md Golam Kibria
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan
| | - Yoko Akazawa-Ogawa
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Nafsoon Rahman
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan
| | - Yoshihisa Hagihara
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yutaka Kuroda
- Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakamachi, Koganei-shi, Tokyo 184-8588, Japan.
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Ma B, Zhang F, Liu Y, Xie J, Wang X. Resveratrol Induces the Conversion from Amyloid to Amorphous Aggregation of β-lactoglobulin>. Protein Pept Lett 2018; 24:1113-1119. [PMID: 28925863 DOI: 10.2174/0929866524666170918120936] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 09/04/2017] [Accepted: 09/04/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Protein aggregation is a wide-ranging phenomenon. Protein aggregation mainly includes two types: one is amorphous aggregation, the other is amyloid aggregation. In particular, amyloid aggregation in vivo can cause several fatal diseases. We have investigated the influence of resveratrol on the amyloid aggregation of β-lactoglobulin. The results demonstrated resveratrol inhibited the amyloid aggregation and enhanced the amorphous aggregation of β- lactoglobulin. OBJECTIVES The main objective of this study was to investigate the effects of resveratrol on the amyloid aggregation of β-lactoglobulin. METHODS β-lactoglobulin was incubated at pH 2.0 and 70 °C. ThT fluorescence, Congo red and transmission electron microscopy were used to monitor the formation of amyloid aggregates. In addition, resveratrol was added intoβ-lactoglobulin solutions. Intrinsic fluorescence, Circular dichroism and 1-Anilinonaphthalene-8-sulfonic Acid (ANS) fluorescence were used to investigate conformational and hydrophobic changes. Furthermore, we also studied the effect of resveratrol on the amyloid aggregation of β-lactoglobulin by using ThT fluorescence, Congo red and transmission electron microscopy at acidic pH and high temperature. RESULTS ThT fluorescence, Congo red and transmission electron microscopy analysis showed that β-lactoglobulin could form the amyloid fibrils when it was incubated under acidic pH and high temperature conditions. At the same time, the analysis also demonstrated resveratrol inhibited the formation of amyloid aggregates and enhanced the formation amorphous aggregates. Intrinsic fluorescence, Circular dichroism and 1-Anilinonaphthalene-8-sulfonic Acid (ANS) fluorescence analysis indicated that resveratrol could alter the conformation and increased the hydrophobicity of β- lactoglobulin. CONCLUSION Our results indicated that resveratrol could effectively inhibit the formation of amyloid aggregates and enhance the formation of amorphous aggregates of β-lactoglobulin. Thus, resveratrol could be a potential inhibitor for preventing the formation of amyloid aggregates.
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Affiliation(s)
- Baoliang Ma
- Department of Physics, Science of College, Nanjing Agricultural University, Nanjing 210095, China
| | - Fan Zhang
- Department of Physics, Science of College, Nanjing Agricultural University, Nanjing 210095, China
| | - Yujie Liu
- Department of Physics, Science of College, Nanjing Agricultural University, Nanjing 210095, China
| | - Jinbing Xie
- College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
| | - Xiaofei Wang
- Department of Physics, Science of College, Nanjing Agricultural University, Nanjing 210095, China
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6
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Kuroda Y. Biophysical studies of protein solubility and amorphous aggregation by systematic mutational analysis and a helical polymerization model. Biophys Rev 2018; 10:473-80. [PMID: 29302914 DOI: 10.1007/s12551-017-0342-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 11/13/2017] [Indexed: 01/04/2023] Open
Abstract
At concentrations above solubility, a protein aggregates, most often into amorphous aggregates, and loses its function. However, unlike amyloidogenic aggregates, which are β-sheeted fibrillar aggregates often related to neurodegenerative diseases, amorphous aggregates, where proteins aggregate/oligomerize without forming specific high-order structures, are rarely the focus of biophysical studies. Hence, protein solubility with respect to amorphous aggregation remains to be fully characterized from a biophysical viewpoint. Here, I briefly describe the structural nature of proteins in amorphous aggregates before discussing systematic mutational analyses that aim to rationalize the contribution of individual amino acids to the solubility of a protein. The discussion is expected to demonstrate that protein solubility, and, accordingly, amorphous aggregation, can be understood using thermodynamic and biophysical rationales similar to those used in the study of protein stability or, more recently, amyloidogenesis. Finally, I will argue that the mathematical formalism of the helical polymerization model (HPM) proposed by Oosawa, Kasai, and Asakura's group can be readily adapted to provide a thermodynamic description of a system containing amorphous aggregates and soluble particles. The HPM and HPM-derived models imply the presence of nuclei or seeds for amorphous aggregates, similar to those hypothesized in crystallogenesis and amyloidogenesis.
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Goto Y, Adachi M, Muta H, So M. Salt-induced formations of partially folded intermediates and amyloid fibrils suggests a common underlying mechanism. Biophys Rev 2017; 10:493-502. [PMID: 29256120 DOI: 10.1007/s12551-017-0370-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 11/19/2017] [Indexed: 12/26/2022] Open
Abstract
Amyloid fibrils are misfolded forms of proteins and are involved in various diseases. They have been studied extensively with the aim to obtain a comprehensive understanding of protein folding and misfolding and to use this knowledge to develop therapeutic strategies against the associated diseases. Salt conditions are important factors determining the formation and stability of amyloid fibrils. In the 1990s, salt effects were studied extensively to understand the conformational stability of acid-denatured proteins, and the results of these studies revealed the role of electrostatic repulsion in forming the compact intermediate states. In this review, we compare the effects of salts on the compact intermediate states with those on the formation of amyloid fibrils under acidic conditions. The results argue that both protein folding and misfolding are driven by the same forces, although the resultant conformations are distinct because they are monomeric and multimeric reactions, respectively.
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Affiliation(s)
- Yuji Goto
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka, 565-0871, Japan.
| | - Masayuki Adachi
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka, 565-0871, Japan
| | - Hiroya Muta
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka, 565-0871, Japan
| | - Masatomo So
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka, 565-0871, Japan
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Mothi N, Muthu SA, Kale A, Ahmad B. Curcumin promotes fibril formation in F isomer of human serum albumin via amorphous aggregation. Biophys Chem 2015; 207:30-9. [PMID: 26298484 DOI: 10.1016/j.bpc.2015.08.002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/22/2015] [Accepted: 08/08/2015] [Indexed: 12/16/2022]
Abstract
We here describe the amyloid fibrils promoting behavior of curcumin, which ability to inhibit amyloid fibrillization of several globular proteins is well documented. Transmission electron microscopy (TEM), 90° light scattering (RLS), thioflavine T (ThT) and Congo red (CR) binding studies demonstrated that both F (pH3.4) and E (pH1.8) isomers of human serum albumin (HSA) in the absence and presence of curcumin initially converted into amorphous aggregates. Interestingly, only the sample containing F isomer preincubated with curcumin formed fibrils on incubation for longer period. We also found that curcumin strongly bind to the F isomer, alter its secondary, tertiary structures and thermal stability. We conclude that the conversion of intermediate states into amorphous aggregate to fibrils is dictated by its conformation. This study provides unique insights into ligand-controlled HSA aggregation pathway and should provide a useful model system to study both amorphous and the fibrillar aggregation of multidomain proteins.
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Affiliation(s)
- Nivin Mothi
- Biophysical Chemistry & Structural Biology Laboratory, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidhyanagari Campus, Mumbai-400098, India
| | - Shivani A Muthu
- Biophysical Chemistry & Structural Biology Laboratory, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidhyanagari Campus, Mumbai-400098, India
| | - Avinash Kale
- Biophysical Chemistry & Structural Biology Laboratory, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidhyanagari Campus, Mumbai-400098, India
| | - Basir Ahmad
- Biophysical Chemistry & Structural Biology Laboratory, UM-DAE Centre for Excellence in Basic Sciences, University of Mumbai, Vidhyanagari Campus, Mumbai-400098, India.
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Hall D, Kardos J, Edskes H, Carver JA, Goto Y. A multi-pathway perspective on protein aggregation: implications for control of the rate and extent of amyloid formation. FEBS Lett 2015; 589:672-9. [PMID: 25647034 PMCID: PMC4349420 DOI: 10.1016/j.febslet.2015.01.032] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 01/23/2015] [Indexed: 12/29/2022]
Abstract
The nucleation-growth model has been used extensively for characterizing in vitro amyloid fibril formation kinetics and for simulating the relationship between amyloid and disease. In the majority of studies amyloid has been considered as the dominant, or sole, aggregation end product, with the presence of other competing non-amyloid aggregation processes, for example amorphous aggregate formation, being largely ignored. Here, we examine possible regulatory effects that off-pathway processes might exert on the rate and extent of amyloid formation - in particular their potential for providing false positives and negatives in the evaluation of anti-amyloidogenic agents. Furthermore, we investigate how such competing reactions might influence the standard interpretation of amyloid aggregation as a two-state system. We conclude by discussing our findings in terms of the general concepts of supersaturation and system metastability - providing some mechanistic insight as to how these empirical phenomena may manifest themselves in the amyloid arena.
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Affiliation(s)
- Damien Hall
- Research School of Chemistry, Australian National University, Acton, ACT 2601, Australia; Institute for Protein Research, Osaka University, 3-1-Yamada-oka, Suita, Osaka 565-0871, Japan.
| | - József Kardos
- MTA-ELTE NAP B Neuroimmunology Research Group and Department of Biochemistry, Institute of Biology, Eötvös Loránd University, Budapest H-1117, Hungary
| | - Herman Edskes
- Laboratory of Biochemistry and Genetics, NIDDK, NIH, Bethesda, Bld 8, MD 20892-0830, USA
| | - John A Carver
- Research School of Chemistry, Australian National University, Acton, ACT 2601, Australia
| | - Yuji Goto
- Institute for Protein Research, Osaka University, 3-1-Yamada-oka, Suita, Osaka 565-0871, Japan
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Yagi H, Mizuno A, So M, Hirano M, Adachi M, Akazawa-Ogawa Y, Hagihara Y, Ikenoue T, Lee YH, Kawata Y, Goto Y. Ultrasonication-dependent formation and degradation of α-synuclein amyloid fibrils. Biochim Biophys Acta 2014; 1854:209-17. [PMID: 25528988 DOI: 10.1016/j.bbapap.2014.12.014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 12/04/2014] [Accepted: 12/12/2014] [Indexed: 01/15/2023]
Abstract
Ultrasonication can be used to break the supersaturation of α-synuclein, a protein associated with Parkinson's disease, at pH7.4 above the critical concentration of fibrillation, thereby inducing the formation of amyloid fibrils. We speculated that ultrasonication could also be used to depolymerize preformed fibrils below the critical concentration. However, extensive ultrasonic irradiation transformed preformed fibrils into amorphous aggregates even above the critical concentration. Exposing preformed fibrils to the hydrophobic air-water interface of cavitation bubbles may have destabilized the fibrils and stabilized amorphous aggregates. Upon extensive ultrasonic irradiation, the accompanying decomposition of chemical structures was suggested when monitored by analytical ultracentrifugation. Amorphous aggregates produced by extensive ultrasonication showed higher cytotoxicity, suggesting that, although ultrasonication might be a useful approach for inactivating amyloid fibrils, potential cytotoxicity of amorphous aggregates should be considered.
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Affiliation(s)
- Hisashi Yagi
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan; Center for Research on Green Sustainable Chemistry, Tottori University, Tottori 680-8552, Japan
| | - Aiko Mizuno
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Masatomo So
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Miki Hirano
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Masayuki Adachi
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Yoko Akazawa-Ogawa
- National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Yoshihisa Hagihara
- National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
| | - Tatsuya Ikenoue
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Young-Ho Lee
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan
| | - Yasushi Kawata
- Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Tottori 680-8552, Japan
| | - Yuji Goto
- Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan.
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11
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Borzova VA, Markossian KA, Kurganov BI. Relationship between the initial rate of protein aggregation and the lag period for amorphous aggregation. Int J Biol Macromol 2014; 68:144-50. [PMID: 24794200 DOI: 10.1016/j.ijbiomac.2014.04.046] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 04/22/2014] [Accepted: 04/22/2014] [Indexed: 01/21/2023]
Abstract
Lag period is an inherent characteristic of the kinetic curves registered for protein aggregation. The appearance of a lag period is connected with the nucleation stage and the stages of the formation of folding or unfolding intermediates prone to aggregation (for example, the stage of protein unfolding under stress conditions). Discovering the kinetic regularities essential for elucidation of the protein aggregation mechanism comprises deducing the relationship between the lag period and aggregation rate. Fändrich proposed the following equation connecting the duration of the lag phase (tlag) and the aggregate growth rate (kg) in the amyloid fibrillation: kg=const/tlag. To establish the relationship between the initial rate of protein aggregation (v) and the lag period (t0) in the case of amorphous aggregation, the kinetics of dithithreitol-induced aggregation of holo-α-lactalbumin from bovine milk was studied (0.1M Na-phosphate buffer, pH 6.8; 37°C). The order of aggregation with respect to protein (n) was calculated from the dependence of the initial rate of protein aggregation on the α-lactalbumin concentration (n=5.3). The following equation connecting v and t0 has been proposed: v(1/n)=const/(t0-t0,lim), where t0,lim is the limiting value of t0 at high concentrations of the protein.
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