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Chisholm TS, Hunter CA. A closer look at amyloid ligands, and what they tell us about protein aggregates. Chem Soc Rev 2024; 53:1354-1374. [PMID: 38116736 DOI: 10.1039/d3cs00518f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
The accumulation of amyloid fibrils is characteristic of neurodegenerative diseases such as Alzheimer's disease (AD) and Parkinson's disease. Detecting these fibrils with fluorescent or radiolabelled ligands is one strategy for diagnosing and better understanding these diseases. A vast number of amyloid-binding ligands have been reported in the literature as a result. To obtain a better understanding of how amyloid ligands bind, we have compiled a database of 3457 experimental dissociation constants for 2076 unique amyloid-binding ligands. These ligands target Aβ, tau, or αSyn fibrils, as well as relevant biological samples including AD brain homogenates. From this database significant variation in the reported dissociation constants of ligands was found, possibly due to differences in the morphology of the fibrils being studied. Ligands were also found to bind to Aβ(1-40) and Aβ(1-42) fibrils with similar affinities, whereas a greater difference was found for binding to Aβ and tau or αSyn fibrils. Next, the binding of ligands to fibrils was shown to be largely limited by the hydrophobic effect. Some Aβ ligands do not fit into this hydrophobicity-limited model, suggesting that polar interactions can play an important role when binding to this target. Finally several binding site models were outlined for amyloid fibrils that describe what ligands target what binding sites. These models provide a foundation for interpreting and designing site-specific binding assays.
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Affiliation(s)
- Timothy S Chisholm
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
| | - Christopher A Hunter
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1 EW, UK.
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2
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Bai Y, Zhang S, Dong H, Liu Y, Liu C, Zhang X. Advanced Techniques for Detecting Protein Misfolding and Aggregation in Cellular Environments. Chem Rev 2023; 123:12254-12311. [PMID: 37874548 DOI: 10.1021/acs.chemrev.3c00494] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Protein misfolding and aggregation, a key contributor to the progression of numerous neurodegenerative diseases, results in functional deficiencies and the creation of harmful intermediates. Detailed visualization of this misfolding process is of paramount importance for improving our understanding of disease mechanisms and for the development of potential therapeutic strategies. While in vitro studies using purified proteins have been instrumental in delivering significant insights into protein misfolding, the behavior of these proteins in the complex milieu of living cells often diverges significantly from such simplified environments. Biomedical imaging performed in cell provides cellular-level information with high physiological and pathological relevance, often surpassing the depth of information attainable through in vitro methods. This review highlights a variety of methodologies used to scrutinize protein misfolding within biological systems. This includes optical-based methods, strategies leaning on mass spectrometry, in-cell nuclear magnetic resonance, and cryo-electron microscopy. Recent advancements in these techniques have notably deepened our understanding of protein misfolding processes and the features of the resulting misfolded species within living cells. The progression in these fields promises to catalyze further breakthroughs in our comprehension of neurodegenerative disease mechanisms and potential therapeutic interventions.
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Affiliation(s)
- Yulong Bai
- Department of Chemistry, Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
| | - Shengnan Zhang
- Interdisciplinary Research Center on Biology and Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 201210, China
| | - Hui Dong
- Interdisciplinary Research Center on Biology and Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 201210, China
- University of the Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Yu Liu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
| | - Cong Liu
- Interdisciplinary Research Center on Biology and Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 201210, China
- State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China
| | - Xin Zhang
- Department of Chemistry, Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China
- Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
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3
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Amin T, Sharma RP, Mir KB, Slathia N, Chhabra S, Tsering D, Kotwal P, Bhagat M, Nandi U, Parkesh R, Kapoor KK, Goswami A. Quinoxalinone substituted pyrrolizine (4h)-induced dual inhibition of AKT and ERK instigates apoptosis in breast and colorectal cancer by modulating mitochondrial membrane potential. Eur J Pharmacol 2023; 957:175945. [PMID: 37541376 DOI: 10.1016/j.ejphar.2023.175945] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Revised: 07/08/2023] [Accepted: 07/31/2023] [Indexed: 08/06/2023]
Abstract
AKT and ERK 1/2 play a pivotal role in cancer cell survival, proliferation, migration, and angiogenesis. Therefore, AKT and ERK 1/2 are considered crucial targets for cancer intervention. In this study, we envisaged the role of AKT and ERK signaling in apoptosis regulation in presence of compound 4h, a novel synthetic derivative of quinoxalinone substituted spiropyrrolizines exhibiting substantial antiproliferative activity in various cancer cell lines. Structurally 4h is a spiropyrrolizine derivative. Molecular docking analysis revealed that compound 4h shows strong binding affinity with AKT-1 (-9.5 kcal/mol) and ERK2 (-9.0 kcal/mol) via binding at allosteric sites of AKT and active site of ERK2. The implications of 4h binding with these two survival kinases resulted in the obstruction for ATP binding, hence, hampering their phosphorylation dependent activation. We demonstrate that 4h mediated apoptotic induction via disruption in the mitochondrial membrane potential of MCF-7 and HCT-116 cells and 4h-mediated inhibition of survival pathways occurred in a wild type PTEN background and is diminished in PTEN-/- cells. In 4T1 mammary carcinoma model, 4h exhibited pronounced reduction in the tumor size and tumor volume at significantly low doses. Besides, 4h reached the highest plasma concentration of 5.8 μM within a period of 1 h in mice model intraperitoneally. Furthermore, 4h showed acceptable clearance with an adequate elimination half-life and satisfactory pharmacokinetic behaviour, thus proclaiming as a potential lead molecule against breast and colorectal cancer by specifically inhibiting simultaneously AKT and ERK1/2 kinases.
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Affiliation(s)
- Tanzeeba Amin
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India
| | | | - Khalid Bashir Mir
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India
| | - Nancy Slathia
- Department of Chemistry, University of Jammu, Jammu 180006, India
| | - Sonali Chhabra
- Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India; CSIR-Institute of Microbial Technology, Chandigarh, 160036, India
| | - Dolma Tsering
- Department of Chemistry, University of Jammu, Jammu 180006, India
| | - Pankul Kotwal
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India
| | - Madhulika Bhagat
- School of Biotechnology, University of Jammu, J&K, 181143, India
| | - Utpal Nandi
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India
| | - Raman Parkesh
- Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India; CSIR-Institute of Microbial Technology, Chandigarh, 160036, India
| | - Kamal K Kapoor
- School of Biotechnology, University of Jammu, J&K, 181143, India.
| | - Anindya Goswami
- Pharmacology Division, CSIR-Indian Institute of Integrative Medicine, Jammu, 180001, India; Academy of Scientific & Innovative Research (AcSIR), Ghaziabad, India.
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4
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Liu XY, Wang XJ, Shi L, Liu YH, Wang L, Li K, Bu Q, Cen XB, Yu XQ. Rational Design of Quinoxalinone-Based Red-Emitting Probes for High-Affinity and Long-Term Visualizing Amyloid-β In Vivo. Anal Chem 2022; 94:7665-7673. [PMID: 35578920 DOI: 10.1021/acs.analchem.2c01046] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disease with insidious onset, and the deposition of amyloid-β (Aβ) is believed to be one of the main cause. Fluorescence imaging is a promising technique for this task, but the Aβ gold standard probe ThT developed based on this still has shortcomings. The development of a new fluorescent probe to detect Aβ plaques is thought to be essential. Herein, a series of red to near-infrared emitting fluorescent probes QNO-ADs with newly quinoxalinone skeleton are designed to detect Aβ plaques. They all demonstrate excellent optical properties and high binding affinity (∼Kd = 20 nM) to Aβ aggregates. As the most outstanding candidate, QNO-AD-3 shows significant signal-to-noise (S/N) ratio at the level of in vitro binding studies, and the brilliant fluorescence staining results in favor of grasping the approximate distribution of Aβ plaques in the brain slice. In vivo Aβ plaques imaging suggests that QNO-AD-3 can cross the BBB and have a long retention time in the brain with low biological toxicity. In addition, the results of docking theoretical calculation also provide some references for the design of Aβ probe. Overall, given the high affinity of QNO-AD-3 and the ability to monitor Aβ plaques for a long time that is not common now, we believe QNO-AD-3 will be an effective tool for an Aβ-related matrix and AD disease research in the future.
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Affiliation(s)
- Xin-Yao Liu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Xiao-Jie Wang
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Medical School, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Lei Shi
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China.,State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, People's Republic of China
| | - Yan-Hong Liu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Liang Wang
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Medical School, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Kun Li
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Qian Bu
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Medical School, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Xiao-Bo Cen
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy/Collaborative Innovation Center for Biotherapy, West China Medical School, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Xiao-Qi Yu
- Key Laboratory of Green Chemistry and Technology (Ministry of Education), College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China.,Department of Chemistry, Xihua University, Chengdu 610039, People's Republic of China
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5
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Sharma RP, Mahajan S, Slathia N, Kapoor KK. FeCl 3 as an efficient catalyst for the synthesis of styrylquinoxalin-2(1 H)-ones. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2070435] [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]
Affiliation(s)
| | - Sheena Mahajan
- CSIR-Indian Institute of Integrative Medicine, Natural Product and Medicinal Chemistry Division, Jammu, India
| | - Nancy Slathia
- Department of Chemistry, University of Jammu, Jammu, India
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6
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Bai Y, Liu Y. Illuminating Protein Phase Separation: Reviewing Aggregation-Induced Emission, Fluorescent Molecular Rotor and Solvatochromic Fluorophore based Probes. Chemistry 2021; 27:14564-14576. [PMID: 34342071 DOI: 10.1002/chem.202102344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Indexed: 11/09/2022]
Abstract
Protein phase separation process involving protein unfolding, misfolding, condensation and aggregation etc. has been associated with numerous human degenerative diseases. The complexity in protein conformational transitions results in multi-step and multi-species biochemical pathways upon protein phase separation. Recent progresses in designing novel fluorescent probes have unraveled the enriched details of phase separated proteins and provided mechanistic insights towards disease pathology. In this review, we summarized the design and characterizations of fluorescent probes that selectively illuminate proteins at different phase separated states with a focus on aggregation-induced emission probes, fluorescent molecular rotors, and solvatochromic fluorophores. Inspired by these pioneering works, a design blueprint was proposed to further develop fluorescent probes that can potentially shed light on the unresolved protein phase separated states in the future.
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Affiliation(s)
- Yulong Bai
- Dalian Institute of Chemical Physics, Chemistry, 457 Zhongshan Road, 116023, Dalian, CHINA
| | - Yu Liu
- Chinese Academy of Sciences, Dalian Institute of Chemical Physics, 457 Zhongshan Road, 116023, Dalian, CHINA
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7
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Pignataro MF, Herrera MG, Dodero VI. Evaluation of Peptide/Protein Self-Assembly and Aggregation by Spectroscopic Methods. Molecules 2020; 25:E4854. [PMID: 33096797 PMCID: PMC7587993 DOI: 10.3390/molecules25204854] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/17/2020] [Accepted: 10/19/2020] [Indexed: 01/08/2023] Open
Abstract
The self-assembly of proteins is an essential process for a variety of cellular functions including cell respiration, mobility and division. On the other hand, protein or peptide misfolding and aggregation is related to the development of Parkinson's disease and Alzheimer's disease, among other aggregopathies. As a consequence, significant research efforts are directed towards the understanding of this process. In this review, we are focused on the use of UV-Visible Absorption Spectroscopy, Fluorescence Spectroscopy and Circular Dichroism to evaluate the self-organization of proteins and peptides in solution. These spectroscopic techniques are commonly available in most chemistry and biochemistry research laboratories, and together they are a powerful approach for initial as well as routine evaluation of protein and peptide self-assembly and aggregation under different environmental stimulus. Furthermore, these spectroscopic techniques are even suitable for studying complex systems like those in the food industry or pharmaceutical formulations, providing an overall idea of the folding, self-assembly, and aggregation processes, which is challenging to obtain with high-resolution methods. Here, we compiled and discussed selected examples, together with our results and those that helped us better to understand the process of protein and peptide aggregation. We put particular emphasis on the basic description of the methods as well as on the experimental considerations needed to obtain meaningful information, to help those who are just getting into this exciting area of research. Moreover, this review is particularly useful to those out of the field who would like to improve reproducibility in their cellular and biomedical experiments, especially while working with peptide and protein systems as an external stimulus. Our final aim is to show the power of these low-resolution techniques to improve our understanding of the self-assembly of peptides and proteins and translate this fundamental knowledge in biomedical research or food applications.
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Affiliation(s)
- María Florencia Pignataro
- Department of Physiology and Molecular and Cellular Biology, Institute of Biosciences, Biotechnology and Translational Biology (iB3), Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires C1428EG, Argentina;
- Institute of Biological Chemistry and Physical Chemistry, Dr. Alejandro Paladini, University of Buenos Aires-CONICET, Buenos Aires C1113AAD, Argentina
| | - María Georgina Herrera
- Department of Physiology and Molecular and Cellular Biology, Institute of Biosciences, Biotechnology and Translational Biology (iB3), Faculty of Exact and Natural Sciences, University of Buenos Aires, Buenos Aires C1428EG, Argentina;
- Institute of Biological Chemistry and Physical Chemistry, Dr. Alejandro Paladini, University of Buenos Aires-CONICET, Buenos Aires C1113AAD, Argentina
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Verónica Isabel Dodero
- Organic and Bioorganic Chemistry, Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
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8
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Mahajan S, Slathia N, Nuthakki VK, Bharate SB, Kapoor KK. Malononitrile-activated synthesis and anti-cholinesterase activity of styrylquinoxalin-2(1 H)-ones. RSC Adv 2020; 10:15966-15975. [PMID: 35493659 PMCID: PMC9052867 DOI: 10.1039/d0ra02816a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 04/16/2020] [Indexed: 12/12/2022] Open
Abstract
Herein, we report a base-free malononitrile activated condensation of 3-methylquinoxaline-2(1H)-one (3MQ) 1 with aryl aldehydes 3a–3ad for synthesis of styrylquinoxalin-2(1H)-ones (SQs) 4a–4ad with excellent yields. In this reaction, malononitrile activates the aldehyde via Knoevenagel condensation towards reaction with 3MQ 1 and gets liberated during the course of reaction to yield the desired SQs 4a–4ad. The SQs were evaluated for in vitro cholinesterase inhibition and 4n was found to display a mixed type of inhibition of AChE, which was supported by molecular modelling studies. This study has led to the discovery of a new chemotype for cholinesterase inhibition which might be useful in finding a remedy for Alzheimer's disease. SQs displaying anti-Alzheimer activity is serendipitous. Malononitrile as a handle to facilitate nucleophilic attack has been applied for the first time for the easy access of SQs.![]()
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Affiliation(s)
- Sheena Mahajan
- Department of Chemistry, University of Jammu Jammu-180006 India
| | - Nancy Slathia
- Department of Chemistry, University of Jammu Jammu-180006 India
| | - Vijay K Nuthakki
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine Canal Road Jammu-180001 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Sandip B Bharate
- Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine Canal Road Jammu-180001 India.,Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Kamal K Kapoor
- Department of Chemistry, University of Jammu Jammu-180006 India
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9
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Aliyan A, Cook NP, Martí AA. Interrogating Amyloid Aggregates using Fluorescent Probes. Chem Rev 2019; 119:11819-11856. [DOI: 10.1021/acs.chemrev.9b00404] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Amir Aliyan
- Pasargad Institute for Advanced Innovative Solutions (PIAIS), Tehran, Iran 1991633361
- Khatam University, Tehran, Iran 1991633356
| | - Nathan P. Cook
- Department of Chemistry, Williams College, Williamstown, Massachusetts 01267, United States
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Bag R, Sikdar Y, Sahu S, Saha P, Bag J, Pal K, Goswami S. A quinoxaline-diaminomaleonitrile conjugate system for colorimetric detection of Cu 2+ in 100% aqueous medium: observation of aldehyde to acid transformation. Dalton Trans 2019; 48:5656-5664. [PMID: 30968912 DOI: 10.1039/c9dt00670b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this work, we have strategically incorporated a quinoxaline derivative and a diaminomaleonitrile moiety to construct a chemosensor, 2-amino-3-[(quinoxalin-2-ylmethylene)-amino]-but-2-enedinitrile (H2qm). The notable feature of this strategy is to generate a highly conjugated Schiff base platform with interesting binding properties. Remarkably, H2qm exhibited a visual sensing ability towards Cu2+ in 100% aqueous medium. The effectiveness of the chemosensor has been demonstrated by utilizing it to determine the Cu2+ concentration in real samples. Interestingly, the reaction between H2qm and Cu(ClO4)2·6H2O in DMSO yielded a quinoxaline-2-carboxylic acid based compound and single crystal X-ray diffraction analysis unveiled the resulting structure as [(qa)2Cu(H2O)2] (Hqa = quinoxaline-2-carboxylic acid).
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Affiliation(s)
- Riya Bag
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata, India.
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11
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Díaz-Hernández D, Cañete Á, Pavez L, Pérez-Sanhueza A, Günther G, Szreder T, De la Fuente JR. Spectral and Kinetic Study of 3-Styrylquinoxalin-2(1 H)-ones Photoreduced by N-Phenylglycine and Amines. J Phys Chem B 2019; 123:3688-3698. [PMID: 30964986 DOI: 10.1021/acs.jpcb.9b01950] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The photoreduction by amines and N-phenylglycine, NPG, of six styrylquinoxalin-2(1 H)-ones derivatives substituted in the styryl moiety, R-SQ, was studied by using flash photolysis. The photoreaction is initiated via a single electron transfer from the electron donor (amines or NPG) to R-SQ excited triplet state, 3R-SQ*, with the formation of a triplet state radical ion pair or a charge transfer exciplex, 3[CRIP/CTE]. These species live longer than the respective 3R-SQ* and have very similar transient spectra. In the presence of NPG, these 3[CRIP/CTE] evolve on μs time scale to the respective hydrogenated radicals, R-SQH•, whose transient spectra and reaction rate constants with NPG are reported. The identity of these hydrogenated radicals was supported by the spectra obtained with the α-H donor triethylamine and previous pulse radiolysis studies in 2-propanol. Our findings allow proposing a radical chain reaction mechanism that explains the observed spectral behavior and rationalizes formation of the main product formed by binding of four PhNHCH2• derived from NPG decarboxylation.
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Affiliation(s)
- Dafne Díaz-Hernández
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223, Santiago 1 , Santiago , Chile
| | - Álvaro Cañete
- Departamento de Química Orgánica, Facultad de Química y de Farmacia , Pontificia Universidad Católica de Chile , Casilla 306, Correo 22 , Santiago , Chile
| | - Lynda Pavez
- Departamento de Química Orgánica, Facultad de Química y de Farmacia , Pontificia Universidad Católica de Chile , Casilla 306, Correo 22 , Santiago , Chile
| | - Alberto Pérez-Sanhueza
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223, Santiago 1 , Santiago , Chile
| | - Germán Günther
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223, Santiago 1 , Santiago , Chile
| | - Tomasz Szreder
- Institute of Nuclear Chemistry and Technology , Dorodna 16 , 03-195 Warsaw , Poland
| | - Julio R De la Fuente
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223, Santiago 1 , Santiago , Chile
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12
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Multicomponent synthesis of substituted 3-styryl-1H-quinoxalin-2-ones in an aqueous medium. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.048] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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13
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Skotnicki K, De la Fuente JR, Cañete Á, Berrios E, Bobrowski K. Radical Ions of 3-Styryl-quinoxalin-2-one Derivatives Studied by Pulse Radiolysis in Organic Solvents. J Phys Chem B 2018. [PMID: 29533616 DOI: 10.1021/acs.jpcb.8b01004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The absorption-spectral and kinetic behaviors of radical ions and neutral hydrogenated radicals of seven 3-styryl-quinoxalin-2(1 H)-one (3-SQ) derivatives, one without substituents in the styryl moiety, four others with electron-donating (R = -CH3, -OCH3, and -N(CH3)2) or electron-withdrawing (R = -OCF3) substituents in the para position in their benzene ring, and remaining two with double methoxy substituents (-OCH3), however, at different positions (meta/para and ortho/meta) have been studied by UV-vis spectrophotometric pulse radiolysis in neat acetonitrile saturated with argon (Ar) and oxygen (O2) and in 2-propanol saturated with Ar, at room temperature. In acetonitrile solutions, the radical anions (4R-SQ•-) are characterized by two absorption maxima located at λmax = 470-490 nm and λmax = 510-540 nm, with the respective molar absorption coefficients ε470-490 = 8500-13 100 M-1 cm-1 and ε510-540 = 6100-10 300 M-1 cm-1, depending on the substituent (R). All 4R-SQ•- decay in acetonitrile via first-order kinetics, with the rate constants in the range (1.2-1.5) × 106 s-1. In 2-propanol solutions, they decay predominantly through protonation by the solvent, forming neutral hydrogenated radicals (4R-SQH•), which are characterized by weak absorption bands with λmax = 480-490 nm. Being oxygen-insensitive, the radical cations (4R-SQ•+) are characterized by a strong absorption with λmax = 450-630 nm, depending on the substituent (R). They are formed in a charge-transfer reaction between a radical cation derived from acetonitrile (ACN•+) and substituted 3-styryl-quinoxalin-2-one derivatives (4R-SQ) with a pseudo-first-order rate constant k = (2.7-4.7) × 105 s-1 measured in solutions containing 0.1 mM 4R-3-SQ. The Hammett equation plot gave a very small negative slope (ρ = -0.08), indicating a very weak influence of the substituents in the benzene ring on the rate of charge-transfer reaction. The decay of 4R-SQ•+ in Ar-saturated acetonitrile solutions occurs with a pseudo-first-order rate constant k = (1.6-6.2) × 104 s-1 and, in principle, is not affected by the presence of O2, suggesting charge-spin delocalization over the whole 3-SQ molecule. Most of the radiolytically generated transient spectra are reasonably well-reproduced by semiempirical PM3-ZINDO/S (for 4R-SQ•-) and density functional theory quantum mechanics calculations employing M06-2x hybrid functional together with the def2-TZVP basis set (for 4R-SQ•+).
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Affiliation(s)
- Konrad Skotnicki
- Institute of Nuclear Chemistry and Technology , 03-195 Warsaw , Poland
| | - Julio R De la Fuente
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223 , Santiago 1 8380492 , Chile
| | - Álvaro Cañete
- Departamento de Química Orgánica, Facultad de Química , Pontificia Universidad Católica de Chile , Casilla 306, Correo 22 , Santiago 7820436 , Chile
| | - Eduardo Berrios
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas , Universidad de Chile , Casilla 223 , Santiago 1 8380492 , Chile
| | - Krzysztof Bobrowski
- Institute of Nuclear Chemistry and Technology , 03-195 Warsaw , Poland.,Notre Dame Radiation Laboratory , University of Notre Dame , Notre Dame , Indiana 46556 , United States
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14
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Besharati-Seidani T, Keivanloo A, Kaboudin B, Yokomatsu T. Efficient synthesis of 2-phenyl-3-substituted furo/thieno[2,3-b]quinoxalines via Sonogashira coupling reaction followed by iodocyclization and subsequent palladium-catalyzed cross-coupling reactions. RSC Adv 2016. [DOI: 10.1039/c6ra15425e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
In this paper, we report the successful synthesis of new 2-phenyl-3-substituted furo/thieno[2,3-b]quinoxaline derivatives from 2-chloro-3-methoxyquinoxaline and 2-chloro-3-(methylthio)quinoxaline by a three-step approach.
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Affiliation(s)
| | - Ali Keivanloo
- School of Chemistry
- Shahrood University of Technology
- Shahrood 36199-95161
- Iran
| | - Babak Kaboudin
- Department of Chemistry
- Institute for Advanced Studies in Basic Sciences
- Zanjan 45137-66731
- Iran
| | - Tsutomu Yokomatsu
- School of Pharmacy
- Tokyo University of Pharmacy and Life Sciences
- Hachioji
- Japan
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15
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Cyclisation reaction between 3-methylquinoxaline-2-thione and benzaldehydes into 3-benzyl-2-aryl-thieno[2,3-b]quinoxaline promoted by Brønsted acids. CR CHIM 2015. [DOI: 10.1016/j.crci.2015.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Peccati F, Hernando J, Blancafort L, Solans-Monfort X, Sodupe M. Disaggregation-induced fluorescence enhancement of NIAD-4 for the optical imaging of amyloid-β fibrils. Phys Chem Chem Phys 2015; 17:19718-25. [DOI: 10.1039/c5cp02728d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence enhancement of the NIAD-4 marker upon interaction with amyloid-β fibrils arises from the disaggregation of the oligomers that spontaneously form in aqueous solution.
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Affiliation(s)
- Francesca Peccati
- Departament de Química
- Universitat Autònoma de Barcelona
- 08193 Bellaterra
- Spain
| | - Jordi Hernando
- Departament de Química
- Universitat Autònoma de Barcelona
- 08193 Bellaterra
- Spain
| | - Lluís Blancafort
- Institut de Química Computacional i Catàlisi i Departament de Química
- Campus Montilivi
- Universitat de Girona
- Girona
- Spain
| | | | - Mariona Sodupe
- Departament de Química
- Universitat Autònoma de Barcelona
- 08193 Bellaterra
- Spain
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17
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Alies B, Eury H, Essassi EM, Pratviel G, Hureau C, Faller P. Concept for Simultaneous and Specific in Situ Monitoring of Amyloid Oligomers and Fibrils via Förster Resonance Energy Transfer. Anal Chem 2014; 86:11877-82. [DOI: 10.1021/ac503509g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Bruno Alies
- CNRS, LCC (Laboratoire
de Chimie de Coordination), 205 Route
de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France
- Université
de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4 France
| | - Helene Eury
- CNRS, LCC (Laboratoire
de Chimie de Coordination), 205 Route
de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France
- Université
de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4 France
| | - El Mokhtar Essassi
- Laboratoire
de Chimie Organique Hétérocyclique, Pôle de Compétences
Pharmacochimie, Université Mohammed V-Agdal, Faculté des Sciences, Avenue Ibn Battouta, BP 1014, Rabat, Morroco
| | - Genevieve Pratviel
- CNRS, LCC (Laboratoire
de Chimie de Coordination), 205 Route
de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France
- Université
de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4 France
| | - Christelle Hureau
- CNRS, LCC (Laboratoire
de Chimie de Coordination), 205 Route
de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France
- Université
de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4 France
| | - Peter Faller
- CNRS, LCC (Laboratoire
de Chimie de Coordination), 205 Route
de Narbonne, BP 44099, F-31077 Toulouse Cedex 4 France
- Université
de Toulouse, UPS, INPT, F-31077 Toulouse Cedex 4 France
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18
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Zanzoul A, Essassi EM, Pratviel G, Saadi M, El Ammari L. N′-(3-Sulfanylidene-3,4-dihydroquinoxalin-2-yl)benzohydrazide dimethylformamide monosolvate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1268. [PMID: 24109350 PMCID: PMC3793763 DOI: 10.1107/s1600536813019181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 07/10/2013] [Indexed: 05/27/2023]
Abstract
The 2-sulfanylidene-3,4-dihydroquinoxalin-2-yl ring system of the title solvate, C15H12N4OS·C3H7NO, is essentially planar, the maximum deviation from the mean plane being 0.024 (2) Å for the thione C atom. The mean plane through the fused-ring system is almost perpendicular to the terminal phenyl ring, as indicated by the dihedral angle of 70.05 (8)°. In the crystal, the main and solvent molecules are linked by N—H⋯O hydrogen bonds, forming a layer parallel to (010).
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19
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Yao QC, Wu DE, Xia M. Synthesis, crystal structure, property research, and DFT calculation of 2,3-diphenylfuro[3,2-b]quinoxaline. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.03.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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20
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Cao K, Farahi M, Dakanali M, Chang WM, Sigurdson CJ, Theodorakis EA, Yang J. Aminonaphthalene 2-cyanoacrylate (ANCA) probes fluorescently discriminate between amyloid-β and prion plaques in brain. J Am Chem Soc 2012; 134:17338-41. [PMID: 22866977 DOI: 10.1021/ja3063698] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A major challenge for diagnosing and monitoring the progression of amyloid-based diseases is the capability to distinguish between amyloid deposits that are associated with related, but distinctly different, diseases. Here, we demonstrate that aminonaphthalenyl 2-cyanoacrylate-based probes can fluorescently discriminate between different types of amyloid deposits in brain. The discriminating capability of these molecular rotors is due to the stabilization of the ground versus excited states of these probes as a function of the polarity of their microenvironment (i.e., within the binding pocket on the amyloid). This property makes it possible, for the first time, to estimate the inherent static relative permittivity (ε(0)) of the binding pocket of each amyloid within tissue. The capability to selectively follow the deposition of specific amyloids in tissue may provide important information for therapeutic development that is not readily accessible from currently available technology.
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Affiliation(s)
- Kevin Cao
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0358, USA
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