1
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Wu J, Zhang X, Xia J, Zhou Z, Xia SH. Mechanistic Insights into the Excited-State Intramolecular Proton Transfer (ESIPT) Process of 2-(2-Aminophenyl)naphthalene. J Phys Chem A 2024. [PMID: 38709493 DOI: 10.1021/acs.jpca.4c00532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2024]
Abstract
The 2-(2-aminophenyl)naphthalene molecule attracted much attention due to excited-state intramolecular proton transfer (ESIPT) from an amino NH2 group to a carbon atom of an adjacent aromatic ring. The ESIPT mechanisms of 2-(2-aminophenyl)naphthalene are still unclear. Herein, the decay pathways of this molecule in vacuum were investigated by combining static electronic structure calculations and nonadiabatic dynamics simulations. The calculations indicated the existence of two stable structures (S0-1 and S0-2) in the S0 and S1 states. For the S0-1 isomer, upon excitation to the Franck-Condon point, the system relaxed to the S1 minimum quickly, and then there exist four decay pathways (two ESIPT ones and two decay channels with C atom pyramidalization). In the ESIPT decay pathways, the system encounters the S1S0-PT-1 or S1S0-PT-2 conical intersection, which funnels the system rapidly to the S0 state. In the other two pathways, the system de-excited from the S1 to the S0 state via the S1S0-1 or S1S0-2 conical intersection. For the S0-2 structure, the decay pathways were similar to those of S0-1. The dynamics simulations showed that 75 and 69% of trajectories experienced the two ESIPT conical intersections for the S0-1 and S0-2 structures, respectively. Our simulations showed that the lifetime of the S1 state of S0-1 (S0-2) is estimated to be 358 (400) fs. Notably, we not only found the detailed reaction mechanism of the system but also found that the different ground-state configurations of this system have little effect on the reaction mechanism in vacuum.
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Affiliation(s)
- Jiahui Wu
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Xinyu Zhang
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Jinglin Xia
- Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China
| | - Zihao Zhou
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Shu-Hua Xia
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
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2
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Novo M, Pérez-González C, Freire S, Al-Soufi W. Early Aggregation of Amyloid-β(1-42) Studied by Fluorescence Correlation Spectroscopy. Methods Mol Biol 2023; 2551:1-14. [PMID: 36310192 DOI: 10.1007/978-1-0716-2597-2_1] [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] [Indexed: 06/16/2023]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease affecting cognitive and memory abilities and is believed to be linked to the formation and accumulation of neurotoxic aggregates of the Amyloid-β peptide (Aβ). In particular, it is the formation of soluble pre-fibrillar oligomers within the early stage of Aβ aggregation which is thought to represent a key step in the development of AD, thus underlining the interest in characterizing the aggregation process and the nature of these aggregates. In this context, fluorescence correlation spectroscopy (FCS) has emerged as a valuable alternative for the study of these systems in solution. Indeed, the use of FCS to study terminally labelled Aβ provides a means to detect changes in the size and concentration of initially monomeric Aβ samples by monitoring these fluorescently labelled species freely diffusing in solution with single-molecule resolution. Herein, we show how to employ FCS to study the early aggregation process of Aβ(1-42) and how this can be used to estimate the critical concentration for oligomer formation and to characterize the aggregates formed.
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Affiliation(s)
- Mercedes Novo
- Department of Physical Chemistry, Faculty of Science, University of Santiago de Compostela, Lugo, Spain.
| | - Cibrán Pérez-González
- Department of Physical Chemistry, Faculty of Science, University of Santiago de Compostela, Lugo, Spain
| | - Sonia Freire
- Department of Physical Chemistry, Faculty of Science, University of Santiago de Compostela, Lugo, Spain
| | - Wajih Al-Soufi
- Department of Physical Chemistry, Faculty of Science, University of Santiago de Compostela, Lugo, Spain
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3
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Chakraborty G, Chattaraj S, Pal H. pH assisted modulation in the binding affinity for BODIPY-benzimidazole conjugate with anionic cyclodextrin. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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4
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Chaudhran PA, Sharma A. Progress in the Development of Imidazopyridine-Based Fluorescent Probes for Diverse Applications. Crit Rev Anal Chem 2022:1-18. [PMID: 36562726 DOI: 10.1080/10408347.2022.2158720] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Different classes of Imidazopyridine i.e., Imidazo[1,2-a]pyridine, Imidazo[1,5-a] pyridine, Imidazo[4,5-b]pyridine, have shown versatile applications in various fields. In this review, we have concisely presented the usefulness of the fluorescent property of imidazopyridine in different fields such as imaging tools, optoelectronics, metal ion detection, etc. Fluorescence mechanisms such as excited state intramolecular proton transfer, photoinduced electron transfer, fluorescence resonance energy transfer, intramolecular charge transfer, etc. are incorporated in the designed fluorophore to make it for fluorescent applications. It has been widely employed for metal ion detection, where selective metal ion detection is possible with triazole-attached imidazopyridine, β-carboline imidazopyridine hybrid, quinoline conjugated imidazopyridine, and many more. Also, other popular applications involve organic light emitting diodes and cell imaging. This review shed a light on recent development in this area especially focusing on the optical properties of the molecules with their usage which would be helpful in designing application-based new imidazopyridine derivatives.
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Affiliation(s)
- Preeti AshokKumar Chaudhran
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Raebareli, Uttar Pradesh, India
| | - Abha Sharma
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Raebareli, Uttar Pradesh, India
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5
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Sen A, Mora AK, Koli M, Mula S, Kundu S, Nath S. Sensing lysozyme fibrils by salicylaldimine substituted BODIPY dyes - A correlation with molecular structure. Int J Biol Macromol 2022; 220:901-909. [PMID: 35998856 DOI: 10.1016/j.ijbiomac.2022.08.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 08/11/2022] [Accepted: 08/16/2022] [Indexed: 11/29/2022]
Abstract
Quick and efficient detection of protein fibrils has enormous impact on the diagnosis and treatment of amyloid related neurological diseases. Among several methods, fluorescence based techniques have garnered most importance in the detection of amyloid fibrils due to its high sensitivity and extreme simplicity. Among other classes of molecular probes, BODIPY derivatives have been employed extensively for the detection of amyloid fibrils. However, there are very few studies on the relationship between the molecular structure of BODIPY dyes and their amyloid sensing activity. Here in a BODIPY based salicylaldimine Schiff base and its corresponding boron complex have been evaluated for their ability to sense amyloid fibrils from hen-egg white lysozyme using steady state and time-resolved spectroscopic techniques. Both dyes show fluorescence enhancement as well as increase in their excited state lifetime upon their binding with lysozyme fibrils. However, the BODIPY derivative which shows more emission enhancement in fibrillar solution has much lower affinity towards amyloid fibrils as compared to other derivative. This contrasting behaviour in the emission enhancement and binding affinity has been explained on the basis of differences in their photophysical properties in water and amyloid fibril originating from the difference in their molecular structure. Such correlation between the amyloid sensitivity and the molecular structure of the probe can open up a new strategy for designing new efficient amyloid probes.
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Affiliation(s)
- Ayentika Sen
- Beam Technology Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
| | - Aruna K Mora
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India.
| | - Mrunesh Koli
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Soumyaditya Mula
- Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India
| | - Soumitra Kundu
- Beam Technology Development Group, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Sukhendu Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400 094, India.
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6
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Wu J, Chen X, Peng LY, Cui G, Xia SH. Excited-State Deactivation Mechanism of 3,5-bis(2-hydroxyphenyl)-1 H-1,2,4-triazole: Electronic Structure Calculations and Nonadiabatic Dynamics Simulations. J Phys Chem A 2022; 126:4002-4012. [PMID: 35730538 DOI: 10.1021/acs.jpca.2c02080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
3,5-bis(2-Hydroxyphenyl)-1H-1,2,4-triazole (bis-HPTA) has attracted wide attention due to the important application in the detection of microorganisms and insecticidal activity. However, the mechanisms of excited-state intramolecular proton transfer (ESIPT) process and decay pathways are still a matter of debate. In this work, we have comprehensively investigated the photodynamics of bis-HPTA by executing combined electronic structure calculations and nonadiabatic surface-hopping dynamics simulations. Based on the computed electronic structure and dynamics information, we propose two nonadiabatic deactivation channels that efficiently populate the ground state from the Franck-Condon region. In the first one, after being excited to the bright S1 state, bis-HPTA molecule undergoes an ultrafast and barrierless ESIPT-1 process. Then, the system encounters with an energetically accessible S1/S0 conical intersection (CI), which funnels the system to the ground state speedily. Afterward, the keto species either arrives at the keto product or return to its enol species via a ground-state proton transfer in the S0 state. In the other excited-state decay channel, the S1 system hops to the ground state through a different CI, which involves the ESIPT-2 process. In our dynamics simulations, about 79.6% of the trajectories decay to the S0 state via the first CI, while the remaining ones employ the second conical intersection. The results of dynamics simulations also demonstrated that the lifetime of the S1 state is estimated as 315 fs. The present work will give elaborating mechanistic information of similar compounds in various environments.
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Affiliation(s)
- Jiahui Wu
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Xiaohang Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Ling-Ya Peng
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Ganglong Cui
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Shu-Hua Xia
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
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7
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Bardasov IN, Alekseeva AU, Shishlikova MA, Ershov OV. Novel “turn-on” fluorescent sensors for silver (I) based on the nicotinonitriles, containing a tricyanobutadiene moiety. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Zhang Z, Yuan Q, Li M, Bao B, Tang Y. A Ratiometric Fluorescent Conjugated Oligomer for Amyloid β Recognition, Aggregation Inhibition, and Detoxification. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2104581. [PMID: 34708516 DOI: 10.1002/smll.202104581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/08/2021] [Indexed: 06/13/2023]
Abstract
The sensitive recognition and effective inhibition of toxic amyloid β protein (Aβ) aggregates play a critical role in early diagnosis and treatment of neurodegenerative diseases. In this work, a new conjugated oligo(fluorene-co-phenylene) (OFP) modified with 1,8-naphthalimide (NA) derivative OFP-NA-NO2 is designed and synthesized as a ratiometric fluorescence probe for sensing Aβ, inhibiting the assembly of Aβ, and detoxicating the cytotoxicity of Aβ aggregates. In the presence of Aβ, the active ester group on the side chain of OFP-NA-NO2 can covalently react with the amino group on Aβ, effectively inhibiting the formation of Aβ aggregates and degrading the preformed fibrils. In this case, the fluorescence intensity ratio of NA to OFP (INA /IOFP ) increases greatly. The detection limit is calculated to be 89.9 nM, presenting the most sensitive ratiometric recognition of Aβ. Interestingly, OFP-NA-NO2 can dramatically recover the cell viability of PC-12 and restore the Aβ-clearing ability of microglia. Therefore, this ratiometric probe exhibits the targeted recognition of Aβ, effective inhibition of Aβ aggregates, and detox effect, which is potential for early diagnosis and treatment of neurodegenerative diseases.
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Affiliation(s)
- Ziqi Zhang
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Qiong Yuan
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Meiqi Li
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Benkai Bao
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
| | - Yanli Tang
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710119, P. R. China
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9
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Karmakar A, Mallick T, Fouzder C, Mukhuty A, Mondal S, Pramanik A, Kundu R, Mandal D, Begum NA. Unfolding the Role of a Flavone-Based Fluorescent Antioxidant towards the Misfolding of Amyloid Proteins: An Endeavour to Probe Amyloid Aggregation. J Phys Chem B 2020; 124:11133-11144. [DOI: 10.1021/acs.jpcb.0c08729] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Abhijit Karmakar
- Department of Chemistry, Visva-Bharati (Central University), Santiniketan 731235, WB, India
| | - Tamanna Mallick
- Department of Chemistry, Visva-Bharati (Central University), Santiniketan 731235, WB, India
| | - Chandrani Fouzder
- Department of Zoology, Visva-Bharati (Central University), Santiniketan 731235, WB, India
| | - Alpana Mukhuty
- Department of Zoology, Visva-Bharati (Central University), Santiniketan 731235, WB, India
| | - Samiran Mondal
- Department of Chemistry, Rammohan College, Kolkata 700009, WB, India
| | - Anup Pramanik
- Department of Chemistry, Sidho-Kanho-Birsha University, Purulia 723104, WB, India
| | - Rakesh Kundu
- Department of Zoology, Visva-Bharati (Central University), Santiniketan 731235, WB, India
| | - Debabrata Mandal
- Department of Chemistry, University College of Science and Technology, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata 700009, WB, India
| | - Naznin Ara Begum
- Department of Chemistry, Visva-Bharati (Central University), Santiniketan 731235, WB, India
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10
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Sayed M, Balayan J, Singh PK, Pal H. Modulation of excited-state photodynamics of ESIPT probe 1′-hydroxy-2′-acetonaphthone (HAN) on interaction with bovine serum albumin. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112651] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Solid state structure and photophysical properties of monoanionic 2-(2′-hydroxyphenyl)benzimidazole as an anionic core in rhenium complex. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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12
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Role of solvent H-bonding and polarity on photophysical properties of a benzothiazole-based ratiometric amyloid fibril sensor. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.12.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Pal K, Samanta I, Gupta RK, Goswami D, Koner AL. Deciphering micro-polarity inside the endoplasmic reticulum using a two-photon active solvatofluorochromic probe. Chem Commun (Camb) 2018; 54:10590-10593. [PMID: 30168820 DOI: 10.1039/c8cc03962c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A new class of two-photon active and solvatofluorochromic dyes for the determination of ER polarity is reported. The fluorescent colour spans almost the entire visible spectrum. One of the derivatives is rationally designed for specific ER targeting. Finally, the fluorescence spectral scanning technique has been utilised to determine the micro-polarity inside the ER which is found to be much lower than that of water.
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Affiliation(s)
- Kaushik Pal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhopal-462066, MP, India.
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14
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Sahu S, Das M, Bharti AK, Krishnamoorthy G. Proton transfer triggered proton transfer: a self-assisted twin excited state intramolecular proton transfer. Phys Chem Chem Phys 2018; 20:27131-27139. [DOI: 10.1039/c8cp03835j] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The double excited state intramolecular proton transfer (ESIPT) of 3,5-bis(2-hydroxyphenyl)-1H-1,2,4-triazole (bis-HPTA) has been investigated and found to undergo a new type of proton transfer.
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Affiliation(s)
- Saugata Sahu
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati
- India
| | - Minati Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati
- India
| | | | - G. Krishnamoorthy
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati
- India
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15
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Amdursky N, Rashid MH, Stevens MM, Yarovsky I. Exploring the binding sites and proton diffusion on insulin amyloid fibril surfaces by naphthol-based photoacid fluorescence and molecular simulations. Sci Rep 2017; 7:6245. [PMID: 28740173 PMCID: PMC5524688 DOI: 10.1038/s41598-017-06030-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 06/09/2017] [Indexed: 11/18/2022] Open
Abstract
The diffusion of protons along biological surfaces and the interaction of biological structures with water are fundamental areas of interest in biology and chemistry. Here, we examine the surface of insulin amyloid fibrils and follow the binding of small molecules (photoacids) that differ according to the number and location of their sulfonic groups. We use transient fluorescence combined with a spherically-symmetric diffusion theory to show that the binding mode of different photoacids determines the efficiency of proton dissociation from the photoacid and the dimensionality of the proton’s diffusion. We use molecular dynamics simulations to examine the binding mode and mechanism of the photoacids and its influence on the unique kinetic rates and diffusion properties of the photoacid’s dissociated proton, where we also suggest a proton transfer process between one of the photoacids to proximal histidine residues. We show that the photoacids can be used as fluorescent markers for following the progression of amyloidogenic processes. The detailed characterisation of different binding modes to the surface of amyloid fibrils paves the way for better understanding of the binding mechanism of small molecules to amyloid fibrils.
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Affiliation(s)
- Nadav Amdursky
- Department of Materials, Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom. .,Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, 3200003, Israel.
| | - M Harunur Rashid
- School of Engineering, RMIT University, Melbourne, Victoria, 3001, Australia
| | - Molly M Stevens
- Department of Materials, Department of Bioengineering and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
| | - Irene Yarovsky
- School of Engineering, RMIT University, Melbourne, Victoria, 3001, Australia.
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16
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Sayed M, Jha S, Pal H. Complexation induced aggregation and deaggregation of acridine orange with sulfobutylether-β-cyclodextrin. Phys Chem Chem Phys 2017; 19:24166-24178. [DOI: 10.1039/c7cp03135a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The present study illustrates intriguing switching of multi-mode binding interactions of acridine orange dye with a sulfobutylether-β-cyclodextrin host.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Shruti Jha
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
| | - Haridas Pal
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai 400 085
- India
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17
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Sayed M, Krishnamurthy B, Pal H. Unraveling multiple binding modes of acridine orange to DNA using a multispectroscopic approach. Phys Chem Chem Phys 2016; 18:24642-53. [PMID: 27545984 DOI: 10.1039/c6cp03716j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction of acridine orange (AOH(+)) with calf thymus DNA (ct-DNA) under different dye-DNA conditions has been investigated in detail using multispectroscopic techniques, unraveling a number of hitherto unexplored intricacies of dye-DNA binding. The observed results intriguingly show contrasting binding features when low (2.4 μM) and significantly high (23 μM) dye concentrations are used. It is conclusively inferred from absorption, steady-state fluorescence, circular dichroism, fluorescence decay and anisotropy decay studies that at low [DNA] to [dye] ratio, especially with higher dye concentration, dimeric AOH(+) predominantly binds externally to DNA surfaces through electrostatic interactions. At sufficiently high [DNA] to [dye] ratios, however, the interaction intriguingly changes to monomeric AOH(+) bound to DNA, predominantly in the intercalative mode between DNA base pairs, with partly an electrostatic binding on DNA surfaces. With very low initial dye concentration, monomeric (AOH(+)) mostly binds to DNA through intercalative and electrostatic modes for most DNA to dye ratios. The present study demonstrates a systematic correlation of the striking changes in the photophysical properties of the dye upon multimode binding with DNA. The observed results are of great significance in understanding the fundamental insights of dye/drug binding to DNA hosts, of use in the design of effective therapeutic agents.
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Affiliation(s)
- Mhejabeen Sayed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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18
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Mtiraoui H, Gharbi R, Msaddek M, Bretonnière Y, Andraud C, Sabot C, Renard PY. 1,5-Benzodiazepin-2-ones: Investigation of a Family of Photoluminescent Materials. J Org Chem 2016; 81:4720-7. [DOI: 10.1021/acs.joc.6b00627] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hasan Mtiraoui
- Laboratory
of Heterocyclic Chemistry Natural Products and Reactivity/CHPNR, Department
of Chemistry, Faculty of Science of Monastir, Université Monastir, 5000 Monastir, Tunisia
| | - Rafik Gharbi
- Laboratory
of Heterocyclic Chemistry Natural Products and Reactivity/CHPNR, Department
of Chemistry, Faculty of Science of Monastir, Université Monastir, 5000 Monastir, Tunisia
| | - Moncef Msaddek
- Laboratory
of Heterocyclic Chemistry Natural Products and Reactivity/CHPNR, Department
of Chemistry, Faculty of Science of Monastir, Université Monastir, 5000 Monastir, Tunisia
| | - Yann Bretonnière
- Univ Lyon,
ENS
de Lyon, CNRS UMR5182, Université Lyon 1, Laboratoire de Chimie, F-69342 Lyon, France
| | - Chantal Andraud
- Univ Lyon,
ENS
de Lyon, CNRS UMR5182, Université Lyon 1, Laboratoire de Chimie, F-69342 Lyon, France
| | - Cyrille Sabot
- Normandie Univ, COBRA, UMR 6014 & FR 3038; Univ Rouen-Normandie; INSA Rouen; CNRS, 1 rue Tesnière 76821 Mont-Saint-Aignan, Cedex, France
| | - Pierre-Yves Renard
- Normandie Univ, COBRA, UMR 6014 & FR 3038; Univ Rouen-Normandie; INSA Rouen; CNRS, 1 rue Tesnière 76821 Mont-Saint-Aignan, Cedex, France
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19
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Aitken L, Quinn SD, Perez-Gonzalez C, Samuel IDW, Penedo JC, Gunn-Moore FJ. Morphology-Specific Inhibition of β-Amyloid Aggregates by 17β-Hydroxysteroid Dehydrogenase Type 10. Chembiochem 2016; 17:1029-37. [PMID: 26991863 DOI: 10.1002/cbic.201600081] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Indexed: 11/08/2022]
Abstract
A major hallmark of Alzheimer's disease (AD) is the formation of toxic aggregates of the β-amyloid peptide (Aβ). Given that Aβ peptides are known to localise within mitochondria and interact with 17β-HSD10, a mitochondrial protein expressed at high levels in AD brains, we investigated the inhibitory potential of 17β-HSD10 against Aβ aggregation under a range of physiological conditions. Fluorescence self-quenching (FSQ) of Aβ(1-42) labelled with HiLyte Fluor 555 was used to evaluate the inhibitory effect under conditions established to grow distinct Aβ morphologies. 17β-HSD10 preferentially inhibits the formation of globular and fibrillar-like structures but has no effect on the growth of amorphous plaque-like aggregates at endosomal pH 6. This work provides insights into the dependence of the Aβ-17β-HSD10 interaction with the morphology of Aβ aggregates and how this impacts enzymatic function.
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Affiliation(s)
- Laura Aitken
- School of Biology, University of St. Andrews, Medical and Biological Sciences Building, North Haugh, St. Andrews, Fife, KY16 9TF, UK
| | - Steven D Quinn
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK.,SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK.,WestCHEM, School of Chemistry, Joseph Black Building, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK
| | - Cibran Perez-Gonzalez
- SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK.,Biomedical Sciences Research Complex, University of St. Andrews, Biomolecular Sciences Building, North Haugh, St. Andrews, Fife, KY16 9ST, UK
| | - Ifor D W Samuel
- Organic Semiconductor Centre, SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK
| | - J Carlos Penedo
- SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife, KY16 9SS, UK. .,Biomedical Sciences Research Complex, University of St. Andrews, Biomolecular Sciences Building, North Haugh, St. Andrews, Fife, KY16 9ST, UK.
| | - Frank J Gunn-Moore
- School of Biology, University of St. Andrews, Medical and Biological Sciences Building, North Haugh, St. Andrews, Fife, KY16 9TF, UK.
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