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Yeh CT, Chang HW, Hsu WH, Huang SJ, Wu MH, Tu LH, Lee MC, Chan JCC. Beta Amyloid Oligomers with Higher Cytotoxicity have Higher Sidechain Dynamics. Chemistry 2023; 29:e202301879. [PMID: 37706579 DOI: 10.1002/chem.202301879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Indexed: 09/15/2023]
Abstract
The underlying biophysical principle governing the cytotoxicity of the oligomeric aggregates of β-amyloid (Aβ) peptides has long been an enigma. Here we show that the size of Aβ40 oligomers can be actively controlled by incubating the peptides in reverse micelles. Our approach allowed for the first time a detailed comparison of the structures and dynamics of two Aβ40 oligomers of different sizes, viz., 10 and 23 nm, by solid-state NMR. From the chemical shift data, we infer that the conformation and/or the chemical environments of the residues from K16 to K28 are different between the 10-nm and 23-nm oligomers. We find that the 10-nm oligomers are more cytotoxic, and the molecular motion of the sidechain of its charged residue K16 is more dynamic. Interestingly, the residue A21 exhibits unusually high structural rigidity. Our data raise an interesting possibility that the cytotoxicity of Aβ40 oligomers could also be correlated to the motional dynamics of the sidechains.
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Affiliation(s)
- Chen-Tsen Yeh
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Han-Wen Chang
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Wen-Hsin Hsu
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Shing-Jong Huang
- Instrumentation Center, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Meng-Hsin Wu
- Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Ting-Chow Road, Taipei, 11677, Taiwan
| | - Ling-Hsien Tu
- Department of Chemistry, National Taiwan Normal University, No. 88, Section 4, Ting-Chow Road, Taipei, 11677, Taiwan
| | - Ming-Che Lee
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
| | - Jerry Chun Chung Chan
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan
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Das A, Islam SI, Das DK, Mitra RK. Modulation of the Excited-State Proton Transfer Rate of d-luciferin in Mixed Reverse Micellar Systems. ACS OMEGA 2018; 3:5715-5724. [PMID: 31458771 PMCID: PMC6641905 DOI: 10.1021/acsomega.8b00800] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 05/10/2018] [Indexed: 06/10/2023]
Abstract
The excited-state proton transfer (ESPT) rate of photo-acids in a confined medium depends on several physical parameters of the immediate environment. We introduce a new parameter in the form of charge type at the interface of reverse micellar (RM) systems to modulate the ESPT rate. We investigate the ESPT reaction of d-luciferin in mixed RM systems composed of nonionic polyoxyethylene(5)nonylphenylether (Igepal CO-520) with cationic didodecyldimethylammonium bromide (DDAB) and anionic sodium bis(2-ethylhexyl)sulfosuccinate (AOT) in cyclohexane (Cy) at different mole fractions of Ig (X Ig) and fixed hydration. ESPT is feeble in AOT RM, whereas it is favorable in the other two RMs. Addition of Ig is observed to facilitate ESPT in AOT RM linearly, whereas in DDAB, it shows a synergistic effect. The various physical parameters of water in the mixed RM water pool have been investigated using dynamic light scattering, Fourier transform infrared, and time-resolved fluorescence spectroscopy measurements to underline the ESPT mechanism in these mixed RMs.
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Affiliation(s)
- Arindam Das
- E-mail: . Tel: 91-33-23355706. Fax: +91-33-23353477 (A.D.)
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Jafarirad S. Innovative amphiphilic cellulose nanobiostructures: Physicochemical, spectroscopic, morphological, and hydrophilic/lipophilic properties. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1225509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Saeed Jafarirad
- Research Institute for Fundamental Sciences (RIFS), University of Tabriz, Tabriz, Iran
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Kundu K, Das A, Bardhan S, Chakraborty G, Ghosh D, Kar B, Saha SK, Senapati S, Mitra RK, Paul BK. The mixing behaviour of anionic and nonionic surfactant blends in aqueous environment correlates in fatty acid ester medium. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.05.078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Modulation of anionic reverse micellar interface with non-ionic surfactants can regulate enzyme activity within the micellar waterpool. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3829-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bardhan S, Kundu K, Kar B, Chakraborty G, Ghosh D, Sarkar D, Das S, Senapati S, Saha SK, Paul BK. Synergistic interactions of surfactant blends in aqueous medium are reciprocated in non-polar medium with improved efficacy as a nanoreactor. RSC Adv 2016. [DOI: 10.1039/c6ra06776j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Efficient soft chemical nanoreactors: a design strategy to improve the performance of a model C–C cross coupling (Heck) reaction under nanoscopic confinement of surfactant blends.
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Affiliation(s)
- Soumik Bardhan
- Department of Chemistry
- University of North Bengal
- Darjeeling-734 013
- India
| | - Kaushik Kundu
- Surface and Colloid Science Laboratory
- Geological Studies Unit
- Indian Statistical Institute
- Kolkata-700 108
- India
| | - Barnali Kar
- Department of Chemistry
- University of North Bengal
- Darjeeling-734 013
- India
| | - Gulmi Chakraborty
- Department of Chemistry
- University of North Bengal
- Darjeeling-734 013
- India
| | - Dibbendu Ghosh
- Department of Biotechnology
- Bhupat and Jyoti Mehta School of Biosciences
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Debayan Sarkar
- Department of Chemistry
- National Institute of Technology
- Rourkela
- India
| | - Sajal Das
- Department of Chemistry
- University of North Bengal
- Darjeeling-734 013
- India
| | - Sanjib Senapati
- Department of Biotechnology
- Bhupat and Jyoti Mehta School of Biosciences
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Swapan K. Saha
- Department of Chemistry
- University of North Bengal
- Darjeeling-734 013
- India
| | - Bidyut K. Paul
- Surface and Colloid Science Laboratory
- Geological Studies Unit
- Indian Statistical Institute
- Kolkata-700 108
- India
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Bardhan S, Kundu K, Chakraborty G, Saha SK, Paul BK. The Schulman Method of Cosurfactant Titration of the Oil/Water Interface (Dilution Method): A Review on a Well-Known Powerful Technique in Interfacial Science for Characterization of Water-in-Oil Microemulsions. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-015-1694-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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