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Kishibe M, Umekage K, Nozaki H, Nakagawa T, Kanno K, Manabe A, Ishida-Yamamoto A. Potential thioflavin T false positives in lipomembranous changes in adipocytes during systemic amyloidosis diagnosis. J Dermatol 2024. [PMID: 39315774 DOI: 10.1111/1346-8138.17476] [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: 06/16/2024] [Revised: 08/20/2024] [Accepted: 09/10/2024] [Indexed: 09/25/2024]
Abstract
The diagnosis of systemic amyloidosis relies on the detection of amyloid deposition in the tissue, often utilizing biopsy specimens from the abdominal skin owing to their minimal invasiveness. Several amyloid staining methods, including Congo Red, Direct Fast Scarlet (DFS), and Thioflavin T (ThT), have been employed for visualization. Lipomembranous fat necrosis (LFN) is a non-specific reaction pattern of adipose tissue to injury, typically derived from blood insufficiency across a wide range of clinical conditions or diseases. It is characterized by the presence of eosinophilic, crenulated, and/or serpiginous membranes in fat lobules. We encountered a patient in whom ThT yielded suspiciously positive results in amyloidosis screening tests. Furthermore, our retrospective observations suggested that ThT staining was positive for LFN, whereas DFS and Congo red staining yielded negative results. The awareness that LFN can result in false-positive ThT staining during amyloid screening is crucial to avoiding the misdiagnosis of systemic amyloidosis. Furthermore, skin samples should not be collected from areas prone to developing lipomembranous changes. The use of more than two different stains for skin biopsy specimens is recommended.
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Affiliation(s)
- Mari Kishibe
- Department of Dermatology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Kaori Umekage
- Department of Dermatology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Hiroyoshi Nozaki
- Department of Dermatology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Tomoe Nakagawa
- Department of Dermatology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Kyoko Kanno
- Department of Dermatology, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
| | - Akira Manabe
- Department of Dermatology, Hakodate National Hospital, Hakodate, Hokkaido, Japan
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2
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Abidi SMS, Shukla AK, Randhawa S, Bathla M, Acharya A. Diosgenin loaded cellulose nanoonion impedes different stages of protein aggregation induced cell death via alleviating mitochondrial dysfunction and upregulation of autophagy. Int J Biol Macromol 2024; 266:131108. [PMID: 38531523 DOI: 10.1016/j.ijbiomac.2024.131108] [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: 10/20/2023] [Revised: 03/19/2024] [Accepted: 03/21/2024] [Indexed: 03/28/2024]
Abstract
Protein aggregation is a multifaceted phenomenon prevalent in the progression of neurodegenerative diseases, yielding aggregates of diverse sizes. Recently, increased attention has been directed towards early protein aggregates due to their pronounced toxicity, largely stemming from inflammation mediated by reactive oxygen species (ROS). This study advocates for a therapeutic approach focusing on inflammation control rather than mere ROS inhibition in the context of neurodegenerative disorders. Here, we introduced Camellia sinensis cellulose nanoonion (CS-CNO) as an innovative, biocompatible nanocarrier for encapsulating the phytosteroid diosgenin (DGN@CS-CNO). The resulting nano-assembly, manifesting as spherical entities with dimensions averaging ~180-220 nm, exhibits a remarkable capacity for the gradual and sustained release of approximately 39-44 % of DGN over a 60-hour time frame. DGN@CS-CNO displays a striking ability to inhibit or disassemble various phases of hen egg white lysozyme (HEWL) protein aggregates, including the early (HEWLEA) and late (HEWLLA) stages. In vitro experiments employing HEK293 cells underscore the potential of DGN@CS-CNO in mitigating cell death provoked by protein aggregation. This effect is achieved by ameliorating ROS-mediated inflammation and countering mitochondrial dysfunction, as evidenced by alterations in TNFα, TLR4, and MT-CO1 protein expression. Western blot analyses reveal that the gradual and sustained release of DGN from DGN@CS-CNO induces autophagy, a pivotal process in dismantling intracellular amyloid deposits. In summary, this study not only illuminates a path forward but also presents a compelling case for the utilization of phytosteroid as a formidable strategy against neuroinflammation incited by protein aggregation.
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Affiliation(s)
- Syed M S Abidi
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ashish K Shukla
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Shiwani Randhawa
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Manik Bathla
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Amitabha Acharya
- Biotechnology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad 201002, India.
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3
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Sonin D, Papayan G, Istomina M, Anufriev I, Pochkaeva E, Minasian S, Zaytseva E, Mukhametdinova D, Mochalov D, Aleksandrov I, Petrishchev N, Galagudza M. Advanced technique of myocardial no-reflow quantification using indocyanine green. BIOMEDICAL OPTICS EXPRESS 2024; 15:818-833. [PMID: 38404317 PMCID: PMC10890880 DOI: 10.1364/boe.511912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 12/29/2023] [Accepted: 12/29/2023] [Indexed: 02/27/2024]
Abstract
The post-ischemic no-reflow phenomenon after primary percutaneous coronary intervention (PCI) is observed in more than half of subjects and is defined as the absence or marked slowing of distal coronary blood flow despite removal of the arterial occlusion. To visualize no-reflow in experimental studies, the fluorescent dye thioflavin S (ThS) is often used, which allows for the estimation of the size of microvascular obstruction by staining the endothelial lining of vessels. Based on the ability of indocyanine green (ICG) to be retained in tissues with increased vascular permeability, we proposed the possibility of using it to assess not only the severity of microvascular obstruction but also the degree of vascular permeability in the zone of myocardial infarction. The aim of our study was to investigate the possibility of using ICG to visualize no-reflow zones after ischemia-reperfusion injury of rat myocardium. Using dual ICG and ThS staining and the FLUM multispectral fluorescence organoscope, we recorded ICG and ThS fluorescence within the zone of myocardial necrosis, identifying ICG-negative zones whose size correlated with the size of the no-reflow zones detected by ThS. It is also shown that the contrast change between the no-reflow zone and nonischemic myocardium reflects the severity of blood stasis, indicating that ICG-negative zones are no-reflow zones. The described method can be an addition or alternative to the traditional method of measuring the size of no-reflow zones in the experiment.
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Affiliation(s)
- Dmitry Sonin
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Pavlov First Saint Petersburg State Medical University, 6–8 Lev Tolstoy Street, 197022 Saint Petersburg, Russia
| | - Garry Papayan
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Pavlov First Saint Petersburg State Medical University, 6–8 Lev Tolstoy Street, 197022 Saint Petersburg, Russia
| | - Maria Istomina
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Saint Petersburg Electrotechnical University “LETI”, 5 Professora Popova Street, 197376 Saint Petersburg, Russia
| | - Ilya Anufriev
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Saint Petersburg Electrotechnical University “LETI”, 5 Professora Popova Street, 197376 Saint Petersburg, Russia
| | - Evgeniia Pochkaeva
- Peter the Great Saint Petersburg Polytechnic University, 29 Polytechnicheskaya str., 195251 Saint Petersburg, Russia
| | - Sarkis Minasian
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Pavlov First Saint Petersburg State Medical University, 6–8 Lev Tolstoy Street, 197022 Saint Petersburg, Russia
| | - Ekaterina Zaytseva
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Daria Mukhametdinova
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Daniil Mochalov
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Ilia Aleksandrov
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Nickolay Petrishchev
- Pavlov First Saint Petersburg State Medical University, 6–8 Lev Tolstoy Street, 197022 Saint Petersburg, Russia
| | - Michael Galagudza
- Institute of Experimental Medicine, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
- Pavlov First Saint Petersburg State Medical University, 6–8 Lev Tolstoy Street, 197022 Saint Petersburg, Russia
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4
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Balan GA, Precupas A, Matei I. Gelation Behaviour of Pluronic F127/Polysaccharide Systems Revealed via Thioflavin T Fluorescence. Gels 2023; 9:939. [PMID: 38131925 PMCID: PMC10742936 DOI: 10.3390/gels9120939] [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: 10/31/2023] [Revised: 11/27/2023] [Accepted: 11/28/2023] [Indexed: 12/23/2023] Open
Abstract
Fast, reliable methods for characterizing the micelle-to-gel transition in emerging Pluronic F127/polysaccharide materials are essential for tailoring their applications as in situ gelling delivery systems. This study describes a simple fluorimetric method based on the response to gelation of the molecular probe thioflavin T (ThT). The techniques employed are (second derivative) steady-state and synchronous fluorescence. The capabilities of ThT as gelation reporter are tested for three model systems: Pluronic F127 (P16.6%), Pluronic F127/alginate (P16.6%ALG2%) and Pluronic F127/hyaluronic acid (P16.6%HA0.5%). We demonstrate that the changes in the short and long wavelength emissions of ThT allow accurate determination of the critical gelation temperatures in the investigated systems. The spectroscopic data providing information at molecular level are complemented with differential scanning microcalorimetric results revealing additional macroscopic insight into the micellization process. The gelation study is preceded by a solvatochromic analysis of ThT.
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Affiliation(s)
| | | | - Iulia Matei
- “Ilie Murgulescu” Institute of Physical Chemistry of the Romanian Academy, 202 Splaiul Independentei, 060021 Bucharest, Romania
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5
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Chen HY, Teng CS, Lin PH, Liu CP, Liu WM, Chu LK. Noncovalent Association Thermodynamics of Turn-On Fluorescent Probes with Human Serum Albumin: Dual-Concentration Ratio Method. Chembiochem 2023; 24:e202300370. [PMID: 37387480 DOI: 10.1002/cbic.202300370] [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: 05/17/2023] [Revised: 06/17/2023] [Accepted: 06/28/2023] [Indexed: 07/01/2023]
Abstract
Efficient quantification of the affinity of a drug and the targeted protein is critical for strategic drug design. Among the various molecules, turn-on fluorescent probes are the most promising signal transducers to reveal the binding strength and site-specificity of designed drugs. However, the conventional method of measuring the binding ability of turn-on fluorescent probes by using the fractional occupancy under the law of mass action is time-consuming and a massive sample is required. Here, we report a new method, called dual-concentration ratio method, for quantifying the binding affinity of fluorescent probes and human serum albumin (HSA). Temperature-dependent fluorescence intensity ratios of a one-to-one complex (L ⋅ HSA) for a turn-on fluorescent probe (L), e. g., ThT (thioflavin T) or DG (dansylglycine), with HSA at two different values of [L]0 /[HSA]0 under the constraint [HSA]0 >[L]0 were collected. The van't Hoff analysis on these association constants further resulted in the thermodynamic properties. Since only two samples at different [L]0 /[HSA]0 are required without the need of [L]0 /[HSA]0 at a wide range, the dual-concentration ratio method is an easy way to greatly reduce the amounts of fluorescent probes and proteins, as well as the acquisition time.
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Affiliation(s)
- Han-Yu Chen
- Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Rd, Hsinchu, 300044, Taiwan
| | - Chung-Siang Teng
- Department of Chemistry, Fu Jen Catholic University, 510, Zhongzheng Rd., New Taipei City, 242062, Taiwan
| | - Pin-Han Lin
- Department of Chemistry, Fu Jen Catholic University, 510, Zhongzheng Rd., New Taipei City, 242062, Taiwan
| | - Ching-Ping Liu
- Department of Chemistry, Fu Jen Catholic University, 510, Zhongzheng Rd., New Taipei City, 242062, Taiwan
| | - Wei-Min Liu
- Department of Chemistry, Fu Jen Catholic University, 510, Zhongzheng Rd., New Taipei City, 242062, Taiwan
| | - Li-Kang Chu
- Department of Chemistry, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Rd, Hsinchu, 300044, Taiwan
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6
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Kumari K, Sharma GS, Gupta A, Singh KS, Singh LR. Functionally active cross-linked protein oligomers formed by homocysteine thiolactone. Sci Rep 2023; 13:5620. [PMID: 37024663 PMCID: PMC10079695 DOI: 10.1038/s41598-023-32694-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 03/31/2023] [Indexed: 04/08/2023] Open
Abstract
Deposition of high-order protein oligomers is a common hallmark of a large number of human diseases and therefore, has been of immense medical interest. From the past several decades, efforts are being made to characterize protein oligomers and explore how they are linked with the disease pathologies. In general, oligomers are non-functional, rather cytotoxic in nature while the functional (non-cytotoxic) oligomers are quite rare. In the present study, we identified new protein oligomers of Ribonuclease-A and Lysozyme that contain functionally active fractions. These functional oligomers are disulfide cross-linked, native-like, and obtained as a result of the covalent modification of the proteins by the toxic metabolite, homocysteine thiolactone accumulated under hyperhomocysteinemia (a condition responsible for cardiovascular complications including atherosclerosis). These results have been obtained from the extensive analysis of the nature of oligomers, functional status, and structural integrity of the proteins using orthogonal techniques. The study implicates the existence of such oligomers as protein sinks that may sequester toxic homocysteines in humans.
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Affiliation(s)
- Kritika Kumari
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, 110007, India
| | - Gurumayum Suraj Sharma
- Department of Botany, Bhaskaracharya College of Applied Sciences, University of Delhi, New Delhi, 110075, India
| | - Akshita Gupta
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, Delhi, 110007, India
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7
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Housmans JAJ, Wu G, Schymkowitz J, Rousseau F. A guide to studying protein aggregation. FEBS J 2023; 290:554-583. [PMID: 34862849 DOI: 10.1111/febs.16312] [Citation(s) in RCA: 56] [Impact Index Per Article: 56.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/18/2021] [Accepted: 12/03/2021] [Indexed: 02/04/2023]
Abstract
Disrupted protein folding or decreased protein stability can lead to the accumulation of (partially) un- or misfolded proteins, which ultimately cause the formation of protein aggregates. Much of the interest in protein aggregation is associated with its involvement in a wide range of human diseases and the challenges it poses for large-scale biopharmaceutical manufacturing and formulation of therapeutic proteins and peptides. On the other hand, protein aggregates can also be functional, as observed in nature, which triggered its use in the development of biomaterials or therapeutics as well as for the improvement of food characteristics. Thus, unmasking the various steps involved in protein aggregation is critical to obtain a better understanding of the underlying mechanism of amyloid formation. This knowledge will allow a more tailored development of diagnostic methods and treatments for amyloid-associated diseases, as well as applications in the fields of new (bio)materials, food technology and therapeutics. However, the complex and dynamic nature of the aggregation process makes the study of protein aggregation challenging. To provide guidance on how to analyse protein aggregation, in this review we summarize the most commonly investigated aspects of protein aggregation with some popular corresponding methods.
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Affiliation(s)
- Joëlle A J Housmans
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Guiqin Wu
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Joost Schymkowitz
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Frederic Rousseau
- Switch Laboratory, VIB Center for Brain and Disease Research, Leuven, Belgium.,Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
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8
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Li YL, Xie JY, Lu B, Sun XD, Chen FF, Tong ZJ, Sai WW, Zhang W, Wang ZH, Zhong M. β-sheets in serum protein are independent risk factors for coronary lesions besides LDL-C in coronary heart disease patients. Front Cardiovasc Med 2022; 9:911358. [PMID: 36017095 PMCID: PMC9395970 DOI: 10.3389/fcvm.2022.911358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Accepted: 07/04/2022] [Indexed: 11/13/2022] Open
Abstract
Background Coronary heart disease (CHD) patients with standard low-density lipoprotein cholesterol (LDL-C) remain at risk of cardiovascular events, making it critical to explore new targets to reduce the residual risk. The relationship between β-sheet conformation and CHD is gaining attention. This study was designed to compare the coronary lesions in CHD patients with varying LDL-C and evaluate whether serum β-sheets are associated with coronary damage. Methods Two hundred and one patients diagnosed with stable CHD were recruited and divided into four groups according to LDL-C. Baseline information, coronary lesion-related indicators, and peripheral blood samples were collected. Serum β-sheet content was determined by thioflavin T fluorescence. Results The baseline information was comparable in CHD patients with different LDL-C. No difference was found in indicators relevant to coronary lesions among groups. The content of β-sheet was negatively correlated with LDL-C. Multiple linear regression revealed that serum β-sheet was positively correlated with coronary lesion when risk factors such as age, smoking, and LDL-C were controlled. Conclusions This is the first study that reports the serum β-sheet levels of CHD patients being gradually increased with decreasing LDL-C when coronary lesions were comparable. Serum β-sheet might exacerbate the coronary lesions in CHD patients independent of known risk factors such as LDL-C.
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Affiliation(s)
- Yu-lin Li
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Jia-ying Xie
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Bin Lu
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Xiao-di Sun
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
- Department of Geriatric Medicine, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Fang-fang Chen
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Zhou-jie Tong
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Wen-wen Sai
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Wei Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Zhi-hao Wang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
- Department of Geriatric Medicine, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Shandong Key Laboratory of Cardiovascular Proteomics, Jinan, China
| | - Ming Zhong
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, The State and Shandong Province Joint Key Laboratory of Translational Cardiovascular Medicine, Department of Cardiology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
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9
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Hanczyc P, Rajchel-Mieldzioć P, Feng B, Fita P. Identification of Thioflavin T Binding Modes to DNA: A Structure-Specific Molecular Probe for Lasing Applications. J Phys Chem Lett 2021; 12:5436-5442. [PMID: 34080857 PMCID: PMC8280760 DOI: 10.1021/acs.jpclett.1c01254] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 05/24/2021] [Indexed: 05/17/2023]
Abstract
The binding mechanism of thioflavin T (ThT) to DNA was studied using polarized light spectroscopy and fluorescence-based techniques in solutions and in solid films. Linear dichroism measurements showed that ThT binds to DNA duplex by intercalation. Time-resolved fluorescence studies revealed a second binding mode which is the external binding to the DNA phosphate groups. Both binding modes represent the nonspecific type of interactions. The studies were complemented with the analysis of short oligonucleotides having DNA cavities. The results indicate that the interplay between three binding modes-intercalation, external binding, and binding inside DNA cavities-determines the effective fluorescence quantum yield of the dye in the DNA structures. External binding was found to be responsible for fluorescence quenching because of energy transfer between intercalated and externally bound molecules. Finally, amplified spontaneous emission (ASE) was successfully generated in the ThT-stained films and used for detecting different DNA structures. ASE measurements show that ThT-stained DNA structures can be used for designing bioderived microlasers.
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Affiliation(s)
- P. Hanczyc
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - P. Rajchel-Mieldzioć
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
| | - B. Feng
- Department
of Chemistry and Chemical Engineering, Chalmers
University of Technology, 412 96 Gothenburg, Sweden
| | - P. Fita
- Institute
of Experimental Physics, Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland
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10
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Pyne P, Samanta N, Gohil H, Prabhu SS, Mitra RK. Alteration of water absorption in the THz region traces the onset of fibrillation in proteins. Chem Commun (Camb) 2021; 57:998-1001. [PMID: 33399590 DOI: 10.1039/d0cc06500e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using terahertz spectroscopy, we established the alteration of the collective hydration of water during the fibrillation process (native → intermediate → fibril) of a model protein bovine serum albumin. This label-free study concludes that water dynamics change systematically with protein conformational changes as it experiences a hydrophobic environment during the initial protein unfolding process, followed by the release of bound water during oligomerization and finally the hydrophobic interior of the fibril.
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Affiliation(s)
- Partha Pyne
- Department of Chemical, Biological & Macro-Molecular Sciences, Satyendra Nath Bose National Centre for Basic Sciences, Block-JD; Sector-III; Salt Lake, Kolkata-700106, India.
| | - Nirnay Samanta
- Department of Chemical, Biological & Macro-Molecular Sciences, Satyendra Nath Bose National Centre for Basic Sciences, Block-JD; Sector-III; Salt Lake, Kolkata-700106, India. and Institute for Physical and Theoretical Chemistry, TU Braunschweig, 38106 Braunschweig, Germany
| | - Himanshu Gohil
- Department of Condensed Matter Physics And Material Science, Tata Institute of Fundamental Research, Homi Bhahba Road, Colaba, Mumbai-400005, India.
| | - S S Prabhu
- Department of Condensed Matter Physics And Material Science, Tata Institute of Fundamental Research, Homi Bhahba Road, Colaba, Mumbai-400005, India.
| | - Rajib Kumar Mitra
- Department of Chemical, Biological & Macro-Molecular Sciences, Satyendra Nath Bose National Centre for Basic Sciences, Block-JD; Sector-III; Salt Lake, Kolkata-700106, India.
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11
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Starosta R, Santos FC, de Almeida RF. Human and bovine serum albumin time-resolved fluorescence: Tryptophan and tyrosine contributions, effect of DMSO and rotational diffusion. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128805] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Fluorescence Lifetime and Intensity of Thioflavin T as Reporters of Different Fibrillation Stages: Insights Obtained from Fluorescence Up-Conversion and Particle Size Distribution Measurements. Int J Mol Sci 2020; 21:ijms21176169. [PMID: 32859090 PMCID: PMC7504639 DOI: 10.3390/ijms21176169] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/23/2020] [Accepted: 08/24/2020] [Indexed: 01/12/2023] Open
Abstract
Thioflavin T (ThT) assay is extensively used for studying fibrillation kinetics in vitro. However, the differences in the time course of ThT fluorescence intensity and lifetime and other physical parameters of the system, such as particle size distribution, raise questions about the correct interpretation of the aggregation kinetics. In this work, we focused on the investigation of the mechanisms, which underlay the difference in sensitivity of ThT fluorescence intensity and lifetime to the formation of protein aggregates during fibrillation by the example of insulin and during binding to globular proteins. The assessment of aggregate sizes and heterogeneity was performed using dynamic light scattering (DLS) and nanoparticle tracking analysis (NTA). Using the sub-nanosecond resolution measurements, it was shown that the ThT lifetime is sensitive to the appearance of as much as a few percent of ThT bound to the high-affinity sites that occur simultaneously with an abrupt increase of the average particle size, particles concentration, and size heterogeneity. The discrepancy between ThT fluorescence intensity and a lifetime can be explained as the consequence of a ThT molecule fraction with ultrafast decay and weak fluorescence. These ThT molecules can only be detected using time-resolved fluorescence measurements in the sub-picosecond time domain. The presence of a bound ThT subpopulation with similar photophysical properties was also demonstrated for globular proteins that were attributed to non-specifically bound ThT molecules with a non-rigid microenvironment.
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Arndt JR, Chaibva M, Beasley M, Karanji AK, Kondalaji SG, Khakinejad M, Sarver O, Legleiter J, Valentine SJ. Nucleation Inhibition of Huntingtin Protein (htt) by Polyproline PPII Helices: A Potential Interaction with the N-Terminal α-Helical Region of Htt. Biochemistry 2020; 59:436-449. [PMID: 31814404 PMCID: PMC7344267 DOI: 10.1021/acs.biochem.9b00689] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Huntington's disease is a genetic neurodegenerative disorder characterized by the formation of amyloid fibrils of the huntingtin protein (htt). The 17-residue N-terminal region of htt (Nt17) has been implicated in the formation of early phase oligomeric species, which may be neurotoxic. Because tertiary interactions with a downstream (C-terminal) polyproline (polyP) region of htt may disrupt the formation of oligomers, which are precursors to fibrillar species, the effect of co-incubation of a region of htt with a 10-residue polyP peptide on oligomerization and fibrillization has been examined by atomic force microscopy. From multiple, time-course experiments, morphological changes in oligomeric species are observed for the protein/peptide mixture and compared with the protein alone. Additionally, an overall decrease in fibril formation is observed for the heterogeneous mixture. To consider potential sites of interaction between the Nt17 region and polyP, mixtures containing Nt17 and polyP peptides have been examined by ion mobility spectrometry and gas-phase hydrogen-deuterium exchange coupled with mass spectrometry. These data combined with molecular dynamics simulations suggest that the C-terminal region of Nt17 may be a primary point of contact. One interpretation of the results is that polyP may possibly regulate Nt17 by inducing a random coil region in the C-terminal portion of Nt17, thus decreasing the propensity to form the reactive amphipathic α-helix. A separate interpretation is that the residues important for helix-helix interactions are blocked by polyP association.
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Affiliation(s)
- James R Arndt
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Maxmore Chaibva
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Maryssa Beasley
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Ahmad Kiani Karanji
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Samaneh Ghassabi Kondalaji
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Mahdiar Khakinejad
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Olivia Sarver
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
| | - Justin Legleiter
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
- WV Nano Safe Iniative, West Virginia University, Morgantown, West Virginia 26506, United States
- The Center for Neuroscience, West Virginia University, Morgantown, West Virginia 26506, United States
| | - Stephen J Valentine
- C. Eugene Bennett Department of Chemistry, West Virginia University, 100 Prospect Street, Morgantown, West Virginia 26506, United States
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Sulatsky MI, Sulatskaya AI, Povarova OI, Antifeeva IA, Kuznetsova IM, Turoverov KK. Effect of the fluorescent probes ThT and ANS on the mature amyloid fibrils. Prion 2020; 14:67-75. [PMID: 32008441 PMCID: PMC7009331 DOI: 10.1080/19336896.2020.1720487] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Fluorescent probes thioflavin T (ThT) and 1-anilino-8-naphthalene sulfonate (ANS) are widely used to study amyloid fibrils that accumulate in the body of patients with serious diseases, such as Alzheimer’s, Parkinson’s, prion diseases, etc. However, the possible effect of these probes on amyloid fibrils is not well understood. In this work, we investigated the photophysical characteristics, structure, and morphology of mature amyloid fibrils formed from two model proteins, insulin and lysozyme, in the presence of ThT and ANS. It turned out that ANS affects the secondary structure of amyloids (shown for fibrils formed from insulin and lysozyme) and their fibers clusterization (valid for lysozyme fibrils), while ThT has no such effects. These results confirm the differences in the mechanisms of these dyes interaction with amyloid fibrils. Observed effect of ANS was explained by the electrostatic interactions between the dye molecule and cationic groups of amyloid-forming proteins (unlike hydrophobic binding of ThT) that induce amyloids conformational changes. This interaction leads to weakening repulsion between positive charges of amyloid fibrils and can promote their clusterization. It was shown that when fibrillogenesis conditions and, consequently, fibrils structure is changing, as well as during defragmentation of amyloids by ultrasonication, the influence of ANS to amyloids does not change, which indicates the universality of the detected effects. Based on the obtained results, it was concluded that ANS should be used cautiously for the study of amyloid fibrils, since this fluorescence probe have a direct effect on the object of study.
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Affiliation(s)
- M I Sulatsky
- Laboratory of Cell Morphology, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia
| | - A I Sulatskaya
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia
| | - O I Povarova
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia
| | - Iu A Antifeeva
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia
| | - I M Kuznetsova
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia
| | - K K Turoverov
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology Russian Academy of Science, St. Petersburg, Russia.,Institute of Physics, Nanotechnology and Telecommunications, Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
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Maciążek-Jurczyk M, Janas K, Pożycka J, Szkudlarek A, Rogóż W, Owczarzy A, Kulig K. Human Serum Albumin Aggregation/Fibrillation and its Abilities to Drugs Binding. Molecules 2020; 25:molecules25030618. [PMID: 32023900 PMCID: PMC7038104 DOI: 10.3390/molecules25030618] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 01/23/2020] [Accepted: 01/29/2020] [Indexed: 02/07/2023] Open
Abstract
Human serum albumin (HSA) is a protein that transports neutral and acid ligands in the organism. Depending on the environment's pH conditions, HSA can take one of the five isomeric forms that change its conformation. HSA can form aggregates resembling those in vitro formed from amyloid at physiological pH (neutral and acidic). Not surprisingly, the main goal of the research was aggregation/fibrillation of HSA, the study of the physicochemical properties of formed amyloid fibrils using thioflavin T (ThT) and the analysis of ligand binding to aggregated/fibrillated albumin in the presence of dansyl-l-glutamine (dGlu), dansyl-l-proline (dPro), phenylbutazone (Phb) and ketoprofen (Ket). Solutions of human serum albumin, both non-modified and modified, were examined with the use of fluorescence, absorption and circular dichroism (CD) spectroscopy. The experiments conducted allowed observation of changes in the structure of incubated HSA (HSAINC) in relation to nonmodified HSA (HSAFR). The formed aggregates/fibrillation differed in structure from HSA monomers and dimers. Based on CD spectroscopy, previously absent βstructural constructs have been registered. Whereas, using fluorescence spectroscopy, the association constants differing for fresh and incubated HSA solutions in the presence of dansyl-amino acids and markers for binding sites were calculated and allowed observation of the conformational changes in HSA molecule.
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Affiliation(s)
- Małgorzata Maciążek-Jurczyk
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
- Correspondence: ; Tel.: +48-32-364-1582
| | - Kamil Janas
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
| | - Jadwiga Pożycka
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
| | - Agnieszka Szkudlarek
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
| | - Wojciech Rogóż
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
| | - Aleksandra Owczarzy
- Independent Public Clinical Hospital No. 1 in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland;
| | - Karolina Kulig
- Department of Physical Pharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, 40-055 Katowice, Poland; (K.J.); (J.P.); (A.S.); (W.R.); (K.K.)
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Effects of lithospermic acid on hIAPP aggregation and amyloid-induced cytotoxicity by multiple analytical methods. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2020; 1868:140283. [DOI: 10.1016/j.bbapap.2019.140283] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 09/06/2019] [Accepted: 09/12/2019] [Indexed: 02/01/2023]
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17
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Holtrup S, Heimerl T, Linne U, Altegoer F, Noll F, Waidner B. Biochemical characterization of the Helicobacter pylori bactofilin-homolog HP1542. PLoS One 2019; 14:e0218474. [PMID: 31233532 PMCID: PMC6590870 DOI: 10.1371/journal.pone.0218474] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 06/03/2019] [Indexed: 01/11/2023] Open
Abstract
The human pathogen Helicobacter pylori is known for its colonization of the upper digestive system, where it escapes the harsh acidic environment by hiding in the mucus layer. One factor promoting this colonization is the helical cell shape of H. pylori. Among shape determining proteins are cytoskeletal elements like the recently discovered bactofilins. Bactofilins constitute a widespread family of polymer-forming bacterial proteins whose biology is still poorly investigated. Here we describe the first biochemical analysis of the bactofilin HP1542 of H. pylori reference strain 26695. Purified HP1542 forms sheet-like 2D crystalline assemblies, which clearly depend on a natively structured C-terminus. Polymerization properties and protein stability were investigated. Additionally, we also could demarcate HP1542 from amyloid proteins that share similarities with the bactofilin DUF domain. By using zonal centrifugation of total H. pylori cell lysates and immunfluorescence analysis we revealed peripheral membrane association of HP1542 mostly pronounced near mid-cell. Interestingly our results indicate that H. pylori bactofilin does not contribute to cell wall stability. This study might act as a starting point for biophysical studies of the H. pylori bactofilin biology as well as for the investigation of bactofilin cell physiology in this organism. Importantly, this study is the first biochemical analysis of a bactofilin in a human pathogen.
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Affiliation(s)
- Sven Holtrup
- LOEWE Center for Synthetic Microbiology, Philipps-Universität, Marburg, Germany
- Faculty of Chemistry, Philipps-Universität, Marburg, Germany
| | - Thomas Heimerl
- LOEWE Center for Synthetic Microbiology, Philipps-Universität, Marburg, Germany
- Faculty of Biology, Philipps-Universität, Marburg, Germany
| | - Uwe Linne
- Faculty of Chemistry, Philipps-Universität, Marburg, Germany
| | - Florian Altegoer
- LOEWE Center for Synthetic Microbiology, Philipps-Universität, Marburg, Germany
- Faculty of Chemistry, Philipps-Universität, Marburg, Germany
| | - Frank Noll
- Faculty of Chemistry, Philipps-Universität, Marburg, Germany
| | - Barbara Waidner
- LOEWE Center for Synthetic Microbiology, Philipps-Universität, Marburg, Germany
- Faculty of Chemistry, Philipps-Universität, Marburg, Germany
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Bellomo G, Bologna S, Cerofolini L, Paciotti S, Gatticchi L, Ravera E, Parnetti L, Fragai M, Luchinat C. Dissecting the Interactions between Human Serum Albumin and α-Synuclein: New Insights on the Factors Influencing α-Synuclein Aggregation in Biological Fluids. J Phys Chem B 2019; 123:4380-4386. [PMID: 31034772 DOI: 10.1021/acs.jpcb.9b02381] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
α-Synuclein (α-syn) is found to be naturally present in biofluids such as cerebrospinal fluid (CSF) and serum. Human serum albumin (HSA) is the most abundant protein found in these biofluids, which, beyond transporting hormones and drugs, also exerts a chaperone-like activity binding other proteins in blood and inhibiting their aggregation. Contrasting results are reported in the literature about the effects of albumin on α-syn aggregation. We characterized the binding region of HSA on α-syn by high-field solution NMR spectroscopy and the effect of HSA on α-syn aggregation by thioflavin-T (ThT) fluorescence under both low-ionic-strength and physiological conditions at the albumin concentration in serum and CSF. We found that HSA, at the concentration found in human serum, slows the aggregation of α-syn significantly. α-Syn interacts with HSA in an ionic strength- and pH-dependent manner. The binding is driven by hydrophobic interactions at the N-terminus under physiological experimental conditions and by electrostatic interactions at the C-terminus at low ionic strength. This work provides novel information about the proteostasis of α-syn in biofluids and supports the hypothesis of a chaperone-like behavior of HSA.
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Affiliation(s)
- Giovanni Bellomo
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy
| | - Sara Bologna
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy
| | - Linda Cerofolini
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy
| | - Silvia Paciotti
- Department of Experimental Medicine , University of Perugia , Piazzale Gambuli 1 , 06132 Perugia , Italy
| | - Leonardo Gatticchi
- Department of Experimental Medicine , University of Perugia , Piazzale Gambuli 1 , 06132 Perugia , Italy
| | - Enrico Ravera
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy.,Department of Chemistry "Ugo Schiff" , University of Florence , Via della Lastruccia 3 , 50019 Sesto Fiorentino , Italy
| | - Lucilla Parnetti
- Clinica Neurologica , Università degli Studi di Perugia , Piazzale Gambuli 1 , 06132 Perugia , Italy
| | - Marco Fragai
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy.,Department of Chemistry "Ugo Schiff" , University of Florence , Via della Lastruccia 3 , 50019 Sesto Fiorentino , Italy
| | - Claudio Luchinat
- Magnetic Resonance Center (CERM) , University of Florence , Via L. Sacconi 6 , 50019 Sesto Fiorentino , Italy.,Department of Chemistry "Ugo Schiff" , University of Florence , Via della Lastruccia 3 , 50019 Sesto Fiorentino , Italy
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Jirasek F, Garcia EJ, Hackemann E, Galeotti N, Hasse H. Influence of pH and Salts on Partial Molar Volume of Lysozyme and Bovine Serum Albumin in Aqueous Solutions. Chem Eng Technol 2018; 41:2337-2345. [PMID: 31007400 PMCID: PMC6472598 DOI: 10.1002/ceat.201800242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 08/27/2018] [Accepted: 09/03/2018] [Indexed: 11/12/2022]
Abstract
The partial molar volume of lysozyme and bovine serum albumin in aqueous solutions at different pH values and in aqueous solutions containing sodium chloride, ammonium chloride, sodium sulfate, or ammonium sulfate at different concentrations at pH 7.0 was investigated experimentally at 298.15 K and 1 bar. It was found that the influence of the pH value and the salts on the partial molar volume of the proteins is small, but trends were measurable. Furthermore, the partial molar volume of lysozyme in pure water at different pH values and in aqueous solutions with different sodium chloride concentrations at pH 7.0 was predicted by molecular simulations. The predictions are in good agreement with the experimental data.
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Affiliation(s)
- Fabian Jirasek
- University of KaiserslauternLaboratory of Engineering Thermodynamics (LTD)Erwin-Schrödinger-Strasse 4467663KaiserslauternGermany
| | - Edder J. Garcia
- University of KaiserslauternLaboratory of Engineering Thermodynamics (LTD)Erwin-Schrödinger-Strasse 4467663KaiserslauternGermany
| | - Eva Hackemann
- University of KaiserslauternLaboratory of Engineering Thermodynamics (LTD)Erwin-Schrödinger-Strasse 4467663KaiserslauternGermany
| | - Nadia Galeotti
- University of KaiserslauternLaboratory of Engineering Thermodynamics (LTD)Erwin-Schrödinger-Strasse 4467663KaiserslauternGermany
| | - Hans Hasse
- University of KaiserslauternLaboratory of Engineering Thermodynamics (LTD)Erwin-Schrödinger-Strasse 4467663KaiserslauternGermany
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Dissection of the deep-blue autofluorescence changes accompanying amyloid fibrillation. Arch Biochem Biophys 2018; 651:13-20. [PMID: 29803394 DOI: 10.1016/j.abb.2018.05.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 04/02/2018] [Accepted: 05/23/2018] [Indexed: 11/21/2022]
Abstract
Pathogenesis of numerous diseases is associated with the formation of amyloid fibrils. Extrinsic fluorescent dyes, including Thioflavin T (ThT), are used to follow the fibrillation kinetics. It has recently been reported that the so-called deep-blue autofluorescence (dbAF) is changing during the aggregation process. However, the origin of dbAF and the reasons for its change remain debatable. Here, the kinetics of fibril formation in model proteins were comprehensively analyzed using fluorescence lifetime and intensity of ThT, intrinsic fluorescence of proteinaceous fluorophores, and dbAF. For all systems, intensity enhancement of the dbAF band with similar spectral parameters (∼350 nm excitation; ∼450 nm emission) was observed. Although the time course of ThT lifetime (indicative of protofibrils formation) coincided with that of tyrosine residues in insulin, and the kinetic changes in the ThT fluorescence intensity (reflecting formation of mature fibrils) coincided with changes in ThT absorption spectrum, the dbAF band started to increase from the beginning of the incubation process without a lag-phase. Our mass-spectrometry data and model experiments suggested that dbAF could be at least partially related to oxidation of amino acids. This study scrutinizes the dbAF features in the context of the existing hypotheses about the origin of this spectral band.
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