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Cao S, Wang D, Cheng R, Shi W, Zhang Q, Zeng H, Chen J. Modulation of the lipophilicity and molecular size of thiosemicarbazone inhibitors to regulate tyrosinase activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 281:121590. [PMID: 35850043 DOI: 10.1016/j.saa.2022.121590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 06/26/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
A group of 5-methylsalicylaldehyde thiosemicarbazone derivatives (HMTs) bearing different lipophilic and steric substituents attached at the 3-position of cresol ring were synthesized and investigated as mushroom tyrosinase (TYR) inhibitors. The ability of HMTs to inhibit the diphenolase activity of TYR was evaluated with L-DOPA as substrate by determining IC50 values in relation to their structure modifications. HMTs displayed distinct inhibitory competencies towards TYR activity with IC50 values in the range of 1.02-143.56 μM. A close correlation between their inhibition potency and both lipophilicity and molecular size was observed. The inhibitory effect of the hydroxyethyl-containing derivatives was much higher than the hydroxyethyl-free ones overall. Among them, HMT-NBO exhibited the most potent effect with IC50 of 5.85 μM, which was nearly 25-fold and 3.8-fold lower than its parent HMT-NBE and the control kojic acid, respectively. The hydroxyethyl clearly benefited the improvement of the inhibitory competences and acted as a regulating group of lipophilicity of the inhibitors. The kinetic analyses showed that HMTs were reversible and mixed type inhibitors against mushroom TYR. The inhibition mechanism was studied by means of fluorescence spectroscopy, FT-IR, ESI-MS and molecular docking analysis. The results indicated that the observed inhibitory effect of HMTs was accomplished by acting on the amino acid residues rather than by chelating the centre copper ions of TYR. Each of HMTs can insert the hydrophobic pocket and interact with the residues of TYR through Van der Waals forces and hydrogen bonds, with additional electrostatic interactions for HMT-NEE and HMT-NEO further strengthening the affinity. Meanwhile, the inhibitors were observed to bind with L-DOPA or/and L-DOPAquinone forming 1:1 stoichiometric complexes, probably exerting indirect inhibition against TYR activity.
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Affiliation(s)
- Shuhong Cao
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China
| | - Dandan Wang
- Industrial Technology Research Academy, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China
| | - Run Cheng
- Industrial Technology Research Academy, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China
| | - Wenyan Shi
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China
| | - Qinfang Zhang
- Industrial Technology Research Academy, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China.
| | - Huajin Zeng
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, PR China.
| | - Jingwen Chen
- Industrial Technology Research Academy, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China; School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Jianjun East Rd. 211, Yancheng 224051, PR China.
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Grigoryan KR, Shilajyan HA, Zatikyan A, Aleksanyan I, Hambardzumyan L. Spectroscopic analysis of 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinolin-4-ol binding to blood plasma albumin. MONATSHEFTE FUR CHEMIE 2022; 153:507-515. [PMID: 35573272 PMCID: PMC9084270 DOI: 10.1007/s00706-022-02919-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 04/25/2022] [Indexed: 11/18/2022]
Abstract
Binding of 2-(5-mercapto-1,3,4-oxadiazol-2-yl)-6-methylquinolin-4-ol (C1), a biologically active substance, to bovine blood plasma albumin (BSA) at 293, 298, and 303 K was studied using fluorescence (steady state, synchronous, excitation/emission matrix) and FT-IR spectroscopy methods. The experimental results showed that C1 causes fluorescence quenching of BSA through both static and dynamic quenching mechanisms. The thermodynamic parameters, enthalpy and entropy change, for the static quenching were calculated to be - 35.73 kJ mol-1 and - 35.34 J mol-1 K-1, which indicated that hydrogen bonding and van der Waals interactions were the predominant intermolecular forces regulating C1-BSA interactions. Distance between donor and acceptor (2.14, 2.26, and 2.30 nm) depending on the temperature, obtained from intrinsic Förster resonance energy transfer calculations, revealed the static quenching mechanism of BSA fluorescence in 0-3.0 × 10-5 mol/dm3 concentration range of C1. The micro-environmental and conformational changes in BSA structure, established by synchronous, excitation/emission matrices and FT-IR spectra showed the changes in the BSA secondary structure. Graphical abstract
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Affiliation(s)
- Karine R. Grigoryan
- Laboratory of Physical Chemistry, Chemistry Research Center, YSU, Yerevan, Armenia
| | - Hasmik A. Shilajyan
- Laboratory of Physical Chemistry, Chemistry Research Center, YSU, Yerevan, Armenia
| | - Ashkhen Zatikyan
- Laboratory of Physical Chemistry, Chemistry Research Center, YSU, Yerevan, Armenia
| | - Iskuhi Aleksanyan
- Laboratory of Organic Chemistry, Chemistry Research Center, YSU, Yerevan, Armenia
| | - Lilit Hambardzumyan
- Laboratory of Organic Chemistry, Chemistry Research Center, YSU, Yerevan, Armenia
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3
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Yu Q, Fan L, Ding Z. The inhibition mechanisms between asparagus polyphenols after hydrothermal treatment and tyrosinase: A circular dichroism spectrum, fluorescence, and molecular docking study. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Second-Order Scattering Quenching in Fluorescence Spectra of Natural Humates as a Tracer of Formation Stable Supramolecular System for the Delivery of Poorly Soluble Antiviral Drugs on the Example of Mangiferin and Favipiravir. Pharmaceutics 2022; 14:pharmaceutics14040767. [PMID: 35456601 PMCID: PMC9030643 DOI: 10.3390/pharmaceutics14040767] [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: 02/26/2022] [Revised: 03/25/2022] [Accepted: 03/29/2022] [Indexed: 12/04/2022] Open
Abstract
In the present work, the methods of dynamic light scattering and fluorescence spectroscopy were applied to study the optical properties of aqueous dilutions of the humic substances complex (HC) as a potential drug delivery system. The supramolecular structures in the humate solution were characterized as monodisperse systems of the submicron range with a tendency to decrease in particle size with a decrease in the dry matter concentration. The slightly alkaline medium (8.3) of the studied aqueous dilutions of HC causes the absence of a pronounced fluorescence maximum in the region from 400 to 500 nm. However, the presence of an analytically significant, inversely proportional to the concentration second-order scattering (SOS) signal at 2λex = λem was shown. In the examples of the antiviral substances mangiferin and favipiravir, it was shown that the use of the humic complex as a drug carrier makes it possible to increase the solubility by several times and simultaneously obtain a system with a smaller particle size of the dispersed phase. It has been shown that HC can interact with mangiferin and favipiravir to form stable structures, which lead to a significant decrease in SOS intensities on HC SOS spectra. The scattering wavelengths, λex/λem, were registered at 350 nm/750 nm for mangiferin and 365 nm/730 nm for favipiravir, respectively. The increments of the scattering intensities (I0/I) turned out to be proportional to the concentration of antiviral components in a certain range of concentrations.
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Senthilkumar M, Dash S, Vigneshwari R, Paulraj E. Aceclofenac-loaded pluronic F108/L81 mixed polymeric micelles: effect of HLB on solubilization. Des Monomers Polym 2022; 25:1-11. [PMID: 35110968 PMCID: PMC8803101 DOI: 10.1080/15685551.2022.2028373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Pluronic block copolymers have phase behavioural characteristics which are extensively studied for drug delivery applications. In this study, we explored hydrophilic pluronic F108 (HLB = 27), hydrophobic pluronic L81 (HLB = 2) and their mixed micelles acting as solubilising mediums for model drug aceclofenac. The drug solubilisation and interactions have been analysed using UV-visible spectroscopy, Fluorescence spectroscopy, Rheology studies, Fourier-transform infrared spectroscopy, Scanning electron microscope, Dynamic light scattering, Cloud point and partition coefficient measurements. The investigation from UV-spectrophotometry demonstrated that mixed pluronic entrapped greater number of aceclofenac molecules than both the neat pluronics at same concentration. Excimer formation was evidenced from fluorescence spectra with pyrene as a probe. The rheological studies showed difference in viscosity over low shear range. Studies on FTIR demonstrated probable bonding between the aceclofenac and mixed pluronic molecules. The DLS studies on mixed pluronic showed swelling of micellar diameter from 317.6 nm to 413.5 nm. Thermodynamic parameters of the above system revealed higher partition coefficient value for mixed pluronic and spontaneity in drug solubilisation. This study can be exploited to use a hydrophobic copolymeric micelle in mixed pluronic formulation for better drug solubilisation.
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Affiliation(s)
- M Senthilkumar
- Department of Chemistry, Annamalai University, Chidambaram, India
| | - Sasmita Dash
- Department of Chemistry, Annamalai University, Chidambaram, India
| | - R Vigneshwari
- Department of Chemistry, Annamalai University, Chidambaram, India
| | - E Paulraj
- Department of Chemistry, Annamalai University, Chidambaram, India
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Chaves OA, Calheiro TP, Netto-Ferreira JC, de Oliveira MC, Franceschini SZ, de Salles CMC, Zanatta N, Frizzo CP, Iglesias BA, Bonacorso HG. Biological assays of BF2-naphthyridine compounds: Tyrosinase and acetylcholinesterase activity, CT-DNA and HSA binding property evaluations. Int J Biol Macromol 2020; 160:1114-1129. [DOI: 10.1016/j.ijbiomac.2020.05.162] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/18/2020] [Accepted: 05/19/2020] [Indexed: 01/30/2023]
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Synthetic ( E)-3-Phenyl-5-(phenylamino)-2-styryl-1,3,4-thiadiazol-3-ium Chloride Derivatives as Promising Chemotherapy Agents on Cell Lines Infected with HTLV-1. Molecules 2020; 25:molecules25112537. [PMID: 32486038 PMCID: PMC7321218 DOI: 10.3390/molecules25112537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/20/2020] [Accepted: 05/26/2020] [Indexed: 12/24/2022] Open
Abstract
Synthesis of four compounds belonging to mesoionic class, (E)-3-phenyl-5-(phenylamino)-2-styryl-1,3,4-thiadiazol-3-ium chloride derivatives (5a–d) and their biological evaluation against MT2 and C92 cell lines infected with human T-cell lymphotropic virus type-1 (HTLV-1), which causes adult T-cell leukemia/lymphoma (ATLL), and non-infected cell lines (Jurkat) are reported. The compounds were obtained by convergent synthesis under microwave irradiation and the cytotoxicity was evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays. Results showed IC50 values of all compounds in the range of 1.51–7.70 μM in HTLV-1-infected and non-infected cells. Furthermore, it was observed that 5b could induce necrosis after 24 h for Jurkat and MT2 cell lines. The experimental (fluorimetric method) and theoretical (molecular docking) results suggested that the mechanism of action for 5b could be related to its capacity to intercalate into DNA. Moreover, the preliminary pharmacokinetic profile of the studied compounds (5a–d) was obtained through human serum albumin (HSA) binding affinity using multiple spectroscopic techniques (circular dichroism, steady-state and time-resolved fluorescence), zeta potential and molecular docking calculations. The interaction HSA:5a–d is spontaneous and moderate (Ka ~ 104 M−1) via a ground-state association, without significantly perturbing both the secondary and surface structures of the albumin in the subdomain IIA (site I), indicating feasible biodistribution in the human bloodstream.
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Mohan S, Hemachandran H, Sneha P, George Priya Doss C, Godwin Christopher J, Jayaraman G, Ramamoorthy S. Structural insights into the binding mode and conformational changes of BSA induced by bixin and crocin. J Biomol Struct Dyn 2017; 36:2085-2098. [DOI: 10.1080/07391102.2017.1342565] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sankari Mohan
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - Hridya Hemachandran
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - P. Sneha
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - C. George Priya Doss
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - J. Godwin Christopher
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - Gurunathan Jayaraman
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
| | - Siva Ramamoorthy
- School of Bio Sciences and Technology, VIT University, Vellore 632014, Tamil Nadu, India
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Liu G, Wang P, Li C, Wang J, Sun Z, Zhao X, Zheng X. Confirming therapeutic target of protopine using immobilized β 2 -adrenoceptor coupled with site-directed molecular docking and the target-drug interaction by frontal analysis and injection amount-dependent method. J Mol Recognit 2017; 30. [PMID: 28124461 DOI: 10.1002/jmr.2613] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2016] [Revised: 12/17/2016] [Accepted: 01/03/2017] [Indexed: 11/09/2022]
Abstract
Drug-protein interaction analysis is pregnant in designing new leads during drug discovery. We prepared the stationary phase containing immobilized β2 -adrenoceptor (β2 -AR) by linkage of the receptor on macroporous silica gel surface through N,N'-carbonyldiimidazole method. The stationary phase was applied in identifying antiasthmatic target of protopine guided by the prediction of site-directed molecular docking. Subsequent application of immobilized β2 -AR in exploring the binding of protopine to the receptor was realized by frontal analysis and injection amount-dependent method. The association constants of protopine to β2 -AR by the 2 methods were (1.00 ± 0.06) × 105 M-1 and (1.52 ± 0.14) × 104 M-1 . The numbers of binding sites were (1.23 ± 0.07) × 10-7 M and (9.09 ± 0.06) × 10-7 M, respectively. These results indicated that β2 -AR is the specific target for therapeutic action of protopine in vivo. The target-drug binding occurred on Ser169 in crystal structure of the receptor. Compared with frontal analysis, injection amount-dependent method is advantageous to drug saving, improvement of sampling efficiency, and performing speed. It has grave potential in high-throughput drug-receptor interaction analysis.
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Affiliation(s)
- Guangxin Liu
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
| | - Pei Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
| | - Chan Li
- Drug Certificate Center, Shaanxi Food and Drug Administration, Xi'an, China
| | - Jing Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
| | - Zhenyu Sun
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
| | - Xinfeng Zhao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
| | - Xiaohui Zheng
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, College of Life Sciences, Northwest University, Xi'an, China
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Dohare N, Khan AB, Maurya N, Thakur S, Athar F, Singh P, Patel R. An insight into the binding of aceclofenac with bovine serum albumin at physiological condition: a spectroscopic and computational approach. J Biomol Struct Dyn 2017; 36:398-406. [DOI: 10.1080/07391102.2017.1278722] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Neeraj Dohare
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
| | - Abbul Bashar Khan
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
| | - Neha Maurya
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
| | - Sonu Thakur
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
| | - Fareeda Athar
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
| | - Prashant Singh
- Department of Chemistry, A. R. S. D. College, University of Delhi , Delhi 110021, India
| | - Rajan Patel
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University) , New Delhi, India
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Raza M, Wei Y, Jiang Y, Ahmad A, Raza S, Ullah S, Han Y, Khan QU, Yuan Q. Molecular mechanism of tobramycin with human serum albumin for probing binding interactions: multi-spectroscopic and computational approaches. NEW J CHEM 2017. [DOI: 10.1039/c7nj02054f] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highlighting novelty: comprehensive in vitro and in silico insights for understanding the novel binding site of TOB with HSA.
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Affiliation(s)
- Muslim Raza
- State Key Laboratory of Chemical Resource Engineering
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing
- P. R. China
| | - Yun Wei
- State Key Laboratory of Chemical Resource Engineering
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing
- P. R. China
| | - Yang Jiang
- Beijing Key Lab of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Aftab Ahmad
- State Key Laboratory of Chemical Resource Engineering
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing
- P. R. China
| | - Saleem Raza
- State Key Laboratory of Chemical Resource Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Sadeeq Ullah
- State Key Laboratory of Chemical Resource Engineering
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing
- P. R. China
| | - Youyou Han
- Beijing Key Lab of Bioprocess
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Qudrat Ullah Khan
- State Key Laboratory of Chemical Resource Engineering
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029
- China
| | - Qipeng Yuan
- State Key Laboratory of Chemical Resource Engineering
- College of Life Science and Technology
- Beijing University of Chemical Technology
- Beijing
- P. R. China
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