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Sasaki R, Tainaka R, Ando Y, Hashi Y, Deepak HV, Suga Y, Murai Y, Anetai M, Monde K, Ohta K, Ito I, Kikuchi H, Oshima Y, Endo Y, Nakao H, Sakono M, Uwai K, Tokuraku K. An automated microliter-scale high-throughput screening system (MSHTS) for real-time monitoring of protein aggregation using quantum-dot nanoprobes. Sci Rep 2019; 9:2587. [PMID: 30796247 PMCID: PMC6384891 DOI: 10.1038/s41598-019-38958-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/11/2019] [Indexed: 12/31/2022] Open
Abstract
Protein aggregation is the principal component of numerous protein misfolding pathologies termed proteinopathies, such as Alzheimer’s disease, Parkinson’s disease, prion disease, and AA amyloidosis with unmet treatment needs. Protein aggregation inhibitors have great potential for the prevention and treatment of proteinopathies. Here we report the development of an automated real-time microliter-scale high throughput screening (MSHTS) system for amyloid aggregation inhibitors using quantum-dot nanoprobes. Screening 504 crude extracts and 134 low molecular weight aromatic compounds revealed the relationship of amyloid-β (Aβ) aggregation inhibitory activities of plant extracts using a plant-based classification. Within the eudicots, rosids, Geraniales and Myrtales showed higher activity. Screening low molecular weight aromatic compounds demonstrated that the structure of tropolone endows it with potential Aβ aggregation inhibitory activity. The activity of the most active tropolone derivative was higher than that of rosmarinic acid. MSHTS also identified three chaperone molecules as tau aggregation inhibitors. These results demonstrate that our automated MSHTS system is a novel and robust tool that can be adapted to a wide range of compounds and aggregation-prone polypeptides.
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Affiliation(s)
- Rina Sasaki
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan
| | - Reina Tainaka
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan
| | - Yuichi Ando
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan
| | - Yurika Hashi
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan.,Yamano College of Aesthetics, Hachioji, Tokyo, Japan
| | - Hadya V Deepak
- Frontier Research Center for Advanced Material and Life Science, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Yoshiko Suga
- Frontier Research Center for Advanced Material and Life Science, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Yuta Murai
- Frontier Research Center for Advanced Material and Life Science, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Masaki Anetai
- Frontier Research Center for Advanced Material and Life Science, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Kenji Monde
- Frontier Research Center for Advanced Material and Life Science, Faculty of Advanced Life Science, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Kiminori Ohta
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, Japan.,School of Pharmacy, Showa University, Tokyo, Japan
| | - Ikuko Ito
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Haruhisa Kikuchi
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Yoshiteru Oshima
- Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Miyagi, Japan
| | - Yasuyuki Endo
- Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, Japan
| | - Hitomi Nakao
- Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
| | - Masafumi Sakono
- Graduate School of Science and Engineering, University of Toyama, Toyama, Japan
| | - Koji Uwai
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan
| | - Kiyotaka Tokuraku
- Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido, Japan.
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Okada Y, Ochi H, Fujii C, Hashi Y, Hamatani M, Ashida S, Kawamura K, Kusaka H, Nakagawa M, Mizuno T, Takahashi R, Kondo T. Dual engagement of TLR4 and CD40 on B cells as a key feature of recovery from relapse. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sakamoto M, Matsumoto R, Togawa J, Takeyama H, Hashi Y, Kobayashi K, Shimotake A, Leypoldt F, Wandinger K, Kondo T, Takahashi R, Ikeda A. Proposal of a diagnostic algorithm for autoimmune epilepsy: A preliminary retrospective cohort study. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.1927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hashi Y, Kotani S, Adachi T. A nematode microtubule-associated protein, PTL-1, closely resembles its mammalian counterparts in overall molecular architecture. Biosci Biotechnol Biochem 2016; 80:1107-13. [PMID: 26906882 DOI: 10.1080/09168451.2016.1141038] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The mammalian microtubule-associated proteins (MAPs), MAP2, MAP4, and τ, are structurally similar and considered to be evolutionarily related. The primary structure of a nematode MAP, PTL-1, also reportedly resembles those of the MAPs, but only in a small portion of the molecule. In this study, we elucidated the overall domain organization of PTL-1, using a molecular dissection technique. Firstly, we isolated nematode microtubules and proved that the recombinant PTL-1 binds to nematode and porcine microtubules with similar affinities. Then, the recombinant PTL-1 was genetically dissected to generate four shorter polypeptides, and their microtubule-binding and assembly promoting activities were assessed, using porcine microtubules and tubulin. PTL-1 was found to consist of two parts, microtubule-binding and projection domains, with the former further divided into three functionally distinct subdomains. The molecular architecture of PTL-1 was proved to be quite analogous to its mammalian counterparts, MAP2, MAP4, and τ, strongly supporting their evolutionary relationships.
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Affiliation(s)
- Yurika Hashi
- a Faculty of Science, Department of Biological Sciences , Kanagawa University , Hiratsuka , Japan
| | - Susumu Kotani
- a Faculty of Science, Department of Biological Sciences , Kanagawa University , Hiratsuka , Japan
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Hashi Y, Kawai G, Kotani S. Microtubule-associated protein (MAP) 4 interacts with microtubules in an intrinsically disordered manner. Biosci Biotechnol Biochem 2014; 78:1864-70. [DOI: 10.1080/09168451.2014.940836] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Abstract
We previously used nuclear magnetic resonance (NMR) to analyze the structure of a synthetic tricosapeptide corresponding to an active site of microtubule-associated protein 4 (MAP4). To further the structural analysis, we have constructed a minimal active domain fragment of MAP4, encompassing the entire active site, and obtained its NMR spectra. The secondary structure prediction using partially assigned NMR data suggested that the fragment is largely unfolded. Two other independent techniques also demonstrated its unfolded nature, indicating that MAP4 belongs to the class of intrinsically disordered proteins (IDPs). The NMR spectra of the fragment-microtubule mixture revealed that the fragment binds to the microtubule using multiple binding sites, apparently contradicting our previous quantitative studies. Given that MAP4 is intrinsically disordered, we propose a mechanism in which any one of the binding sites is active at a time, which is one of the typical interaction mechanisms proposed for IDPs.
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Affiliation(s)
- Yurika Hashi
- Faculty of Science, Department of Biological Sciences, Kanagawa University, Hiratsuka, Japan
| | - Gota Kawai
- Faculty of Engineering, Department of Life and Environmental Sciences, Chiba Institute of Technology, Narashino, Japan
| | - Susumu Kotani
- Faculty of Science, Department of Biological Sciences, Kanagawa University, Hiratsuka, Japan
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