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Durga Priyadharshini R, Ravi J, Ragunathan P, Vennila KN, Elango KP. Multi-spectroscopic, thermodynamic and molecular simulation studies on binding of pyrroloquinoline quinone with DNA: coexistence of intercalation and groove binding modes. J Biomol Struct Dyn 2024; 42:7457-7466. [PMID: 37559546 DOI: 10.1080/07391102.2023.2245477] [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] [Received: 05/18/2023] [Accepted: 07/17/2023] [Indexed: 08/11/2023]
Abstract
The interaction between enzyme-like pyrroloquinoline quinone (PQQ) and calf-thymus DNA (CT-DNA) has been investigated by means of multi-spectroscopic (UV-Vis, fluorescence and circular dichroism), isothermal titration calorimetric (ITC), viscometry and molecular docking and metadynamics simulation techniques. Absorption spectral data suggested the formation of a PQQ/CT-DNA complex, which quenched the fluorescence of PQQ via the dynamic quenching process. The results of CD spectral studies coupled with viscosity measurements, competitive binding assays with Hoechst 33258 and ethidium bromide (EB), KI quenching experiments, gel electrophoresis and DNA melting studies indicated groove binding mode of interaction of PQQ with CT-DNA. ITC experiment revealed that the complex formation is a spontaneous process (ΔGo < 0) with a binding constant of 1.05 × 104 M-1. The observed ΔHo < 0 and ΔSo < 0 pointed out that the complex is stabilized by van der Waals forces along with H-bonding interactions. The outcomes of molecular docking and simulation studies confirmed the binding of PQQ with DNA. The free energy surface (FES) analysis pointed out the existence of an equilibrium between partial intercalation and groove binding modes, which is in good agreement with the competitive binding assays.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- R Durga Priyadharshini
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - Jayashree Ravi
- Centre for Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India
| | - Preethi Ragunathan
- Centre for Advanced Study in Crystallography and Biophysics, University of Madras, Chennai, India
| | - K N Vennila
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - Kuppanagounder P Elango
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
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2
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Amir M, Aamir Qureshi M, Khan A, Nayeem SM, Ayoub Malik W, Javed S. Exploring the interaction of tepotinib with calf thymus DNA using molecular dynamics simulation and multispectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 308:123678. [PMID: 38039637 DOI: 10.1016/j.saa.2023.123678] [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: 08/03/2023] [Revised: 10/05/2023] [Accepted: 11/21/2023] [Indexed: 12/03/2023]
Abstract
In recent times, there has been a surge in the discovery of drugs that directly interact with DNA, influencing gene expression. As a result, understanding how biomolecules interact with DNA has become a major area of research. One such drug is Tepotinib (TPT), an FDA-approved anti-cancer medication known as a MET tyrosine kinase inhibitor, used in chemotherapy for metastatic non-small cell lung cancer (NSCLC) with MET exon 14 skipping alterations. In our study, we adopted both biophysical and in-silico methods to investigate the binding relationship of TPT and ctDNA. The absorption spectra of ctDNA exhibited a hypochromic effect when titrated with TPT and the binding constant of TPT-ctDNA complex was calculated, Ka = 9.91 × 104 M-1. By computing bimolecular enhancement constant (KB) and thermodynamic enhancement constant (KD) in fluorometric investigations, it was found that the fluorescence enhancement is a result of a static process involving the ctDNA-TPT complex formation in the ground state, as opposed to a dynamic process. The displacement assay results further supported this finding, showing that TPT exhibits a binding preference for minor groove of ct-DNA and was also demonstrated by KI quenching and CD spectroscopy. The molecular docking and molecular dynamic simulations validated TPT's groove binding nature and binding pattern with ctDNA, respectively. Thus, the results of our present investigation offer valuable insights into the interaction between TPT and ctDNA. It is evident that TPT, as an anti-cancer medication, binds to the minor groove of ctDNA.
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Affiliation(s)
- Mohd Amir
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
| | - Mohd Aamir Qureshi
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
| | - Ashma Khan
- Department of Chemistry, Faculty of Sciences, Aligarh Muslim University, Aligarh 202002, India.
| | - Shahid M Nayeem
- Department of Chemistry, Faculty of Sciences, Aligarh Muslim University, Aligarh 202002, India.
| | - Waseem Ayoub Malik
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
| | - Saleem Javed
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India.
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Ham S, Hamadi K, Zergui A, Djouad ME. Multi-element analysis of food dyes and assessment of consumer's health. FOOD ADDITIVES & CONTAMINANTS. PART B, SURVEILLANCE 2024; 17:28-34. [PMID: 37982364 DOI: 10.1080/19393210.2023.2278807] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/30/2023] [Indexed: 11/21/2023]
Abstract
The present study assessed metallic contaminants levels in food colourings using an inductively coupled plasma mass spectrometry (ICP-MS) in 51 samples of food dyes marketed in Algeria. The analysed samples were contaminated with lead (0.77 ± 0.034), arsenic (0.008 ± 0.006), cadmium (0.102 ± 0.047), cobalt (0.017 ± 0.008), copper (0.025 ± 0.011), chromium (0.820 ± 0.051), and nickel (0.022 ± 0.009) µg g-1. Mercury constituted a minor contaminant (<0.001 to 0.002 µg g-1). Turmeric and saffron were the most contaminated with Pb, As, Cd, Co, Cu, Cr, and Ni (p < 0.05). Health risk assessment revealed that infant population presents adverse non-carcinogenic effects (THQ = 4.25) and carcinogenic risk (HI = 4.65) linked to the consumption of food dyes contaminated with Cr.
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Affiliation(s)
- Sanaa Ham
- Department of Biology, Faculty of Natural and Life Sciences, University of Chlef, Ouled Fares, Algeria
| | - Karima Hamadi
- Department of Biology, Faculty of Natural and Life Sciences, University of Chlef, Ouled Fares, Algeria
| | | | - Mokhtar Eddine Djouad
- Department of Biology, Faculty of Natural and Life Sciences, University of Chlef, Ouled Fares, Algeria
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Czech-Załubska K, Klich D, Jackowska-Tracz A, Didkowska A, Bogdan J, Anusz K. Dyes Used in Processed Meat Products in the Polish Market, and Their Possible Risks and Benefits for Consumer Health. Foods 2023; 12:2610. [PMID: 37444348 DOI: 10.3390/foods12132610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/03/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023] Open
Abstract
Manufacturers are obliged to label processed meat products with information concerning the additives used and nutritional values. The aim of the study was to identify the dyes most frequently used in processed meat, evaluate their influence on specific food qualities, assess whether their use was correct and review their effect on health. The analysis was based on information on the labels and images of processed meat, and used a generalised linear model with a binary dependent variable. The risks and benefits for human health were defined based on the available literature. Twelve dyes were found to be used in the manufacture of processed meat. Carmine was found in 183 of 273 (67.03%) evaluated assortments containing dyes. The occurrence of water, flavourings and high fat and carbohydrate contents increased the chances that a dye would be present in a particular product. Unauthorised use of food additives was found in 20 products, with smoked meat products demonstrating the highest number of non-compliances. In general, the dyes used with food are considered safe; however, reservations are associated with the use of E150C and E150D caramels due to their potential carcinogenic effect, and carmine and annatto due to their allergic effects.
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Affiliation(s)
- Katarzyna Czech-Załubska
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166, 02-787 Warsaw, Poland
| | - Daniel Klich
- Institute of Animal Sciences, University of Life Sciences-SGGW, Ciszewskiego 8, 02-786 Warsaw, Poland
| | - Agnieszka Jackowska-Tracz
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166, 02-787 Warsaw, Poland
| | - Anna Didkowska
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166, 02-787 Warsaw, Poland
| | - Janusz Bogdan
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166, 02-787 Warsaw, Poland
| | - Krzysztof Anusz
- Department of Food Hygiene and Public Health Protection, Institute of Veterinary Medicine, Warsaw University of Life Sciences (SGGW), Nowoursynowska 166, 02-787 Warsaw, Poland
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Khan KA, Shah A, Nisar J, Haleem A, Shah I. Photocatalytic Degradation of Food and Juices Dyes via Photocatalytic Nanomaterials Synthesized through Green Synthetic Route: A Systematic Review. Molecules 2023; 28:4600. [PMID: 37375155 DOI: 10.3390/molecules28124600] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 05/31/2023] [Accepted: 06/01/2023] [Indexed: 06/29/2023] Open
Abstract
The unavailability of non-poisonous and hygienic food substances is the most challenging issue of the modern era. The uncontrolled usage of toxic colorant moieties in cosmetics and food manufacturing units leads to major threats to human life. The selection of environmentally benign approaches for the removal of these toxic dyes has gained the utmost attention from researchers in recent decades. This review article's main aim is the focus on the application of green-synthesized nanoparticles (NPs) for the photocatalytic degradation of toxic food dyes. The use of synthetic dyes in the food industry is a growing concern due to their harmful effects on human health and the environment. In recent years, photocatalytic degradation has emerged as an effective and eco-friendly method for the removal of these dyes from wastewater. This review discusses the various types of green-synthesized NPs that have been used for photocatalytic degradation (without the production of any secondary pollutant), including metal and metal oxide NPs. It also highlights the synthesis methods, characterization techniques, and photocatalytic efficiency of these NPs. Furthermore, the review explores the mechanisms involved in the photocatalytic degradation of toxic food dyes using green-synthesized NPs. Different factors that responsible for the photodegradation, are also highlighted. Advantages and disadvantages, as well as economic cost, are also discussed briefly. This review will be advantageous for the readers because it covers all aspects of dyes photodegradation. The future feature and limitations are also part of this review article. Overall, this review provides valuable insights into the potential of green-synthesized NPs as a promising alternative for the removal of toxic food dyes from wastewater.
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Affiliation(s)
- Kashif Ali Khan
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Afzal Shah
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Jan Nisar
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan
| | - Abdul Haleem
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Iltaf Shah
- Department of Chemistry, College of Science, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates
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Ponkarpagam S, Vennila KN, Elango KP. A closer look at the mode of binding of drug pemetrexed with CT-DNA. J Biomol Struct Dyn 2023; 41:3553-3561. [PMID: 35297322 DOI: 10.1080/07391102.2022.2051747] [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] [Received: 12/24/2021] [Accepted: 03/05/2022] [Indexed: 10/18/2022]
Abstract
The interaction of antifolate drug Pemetrexed (PEM) with CT-DNA has been studied by UV-Vis, fluorescence and circular dichroism spectroscopic techniques. The results of these spectroscopic studies in combination with viscosity measurements, voltammetric and KI quenching studies suggested a less-common mode of binding of PEM with CT-DNA i.e. neither intercalation nor groove binding. Thus, metadynamic (MD) simulation is utilized to decipher the nature of binding of PEM with CT-DNA. Analysis of free energy surfaces obtained in MD simulation, reveals that PEM binds to the 3'- and 5'-ends of the DNA molecule. The thermodynamics of the interaction has been investigated by isothermal titration calorimetric experiment. The analysis shows that PEM binds with CT-DNA strongly with a binding constant of 2.6x109 M-1 and the process is found to be spontaneous (ΔG - 12.84 kcal/mol). Further, positive values of enthalpy (ΔH 6.09 cal/mol) and entropy (ΔS 43.1 cal/mol) changes indicate that the binding is an enthalpically unfavourable and, instead, entropically driven process.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- S Ponkarpagam
- Department of Chemistry, Gandhigram Rural Institute, (Deemed to be University), Gandhigram, India
| | - K N Vennila
- Department of Chemistry, Gandhigram Rural Institute, (Deemed to be University), Gandhigram, India
| | - Kuppanagounder P Elango
- Department of Chemistry, Gandhigram Rural Institute, (Deemed to be University), Gandhigram, India
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Dehkordi MF, Farhadian S, Hashemi-Shahraki F, Rahmani B, Darzi S, Dehghan G. The interaction mechanism of candidone with calf thymus DNA: A multi-spectroscopic and MD simulation study. Int J Biol Macromol 2023; 235:123713. [PMID: 36801300 DOI: 10.1016/j.ijbiomac.2023.123713] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 02/11/2023] [Accepted: 02/11/2023] [Indexed: 02/18/2023]
Abstract
In this investigation, the effects of candidone on the structure and conformation of DNA were evaluated by spectroscopic methods, molecular dynamics simulation, and molecular docking studies. Fluorescence emission peaks, ultraviolet-visible spectra, and molecular docking exhibited the complex formation between candidone and DNA in a groove-binding mode. Fluorescence spectroscopy results also showed a static quenching mechanism of DNA in the presence of candidone. Moreover, thermodynamic parameters demonstrated that candidone spontaneously bound to DNA with a high binding affinity. The hydrophobic interactions were the dominant forces over the binding process. Based on the Fourier transform infrared data candidone tended to attach to the A-T base pairs of the minor grooves of DNA. The thermal denaturation and circular dichroism measurements displayed that candidone caused a slight change in the DNA structure, which was confirmed by the molecular dynamics simulation results. According to the obtained findings from the molecular dynamic simulation, the structural flexibility and dynamics of DNA were altered to a more extended structure.
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Affiliation(s)
- Mahvash Farajzadeh Dehkordi
- Department of Molecular Medicine, Qazvin University of Medical Sciences, Qazvin, Iran; Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Sadegh Farhadian
- Department of Biology, Faculty of Science, Shahrekord University, Shahrekord, Iran; Central Laboratory, Shahrekord University, Shahrekord, Iran.
| | - Fatemeh Hashemi-Shahraki
- Department of Biology, Faculty of Science, Shahrekord University, Shahrekord, Iran; Central Laboratory, Shahrekord University, Shahrekord, Iran
| | - Babak Rahmani
- Department of Molecular Medicine, Qazvin University of Medical Sciences, Qazvin, Iran; Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran.
| | - Sina Darzi
- Health Products Safety Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Gholamreza Dehghan
- Department of Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
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8
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Design, synthesis, anticancer evaluation and molecular docking studies of new imidazo [2, 1-b] thiazole -based chalcones. Med Chem Res 2022. [DOI: 10.1007/s00044-022-02916-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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9
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Lu XY, Lou YY, Zhou KL, Jiang SL, Shi JH. Exploring the binding characteristics of febuxostat, an inhibitor of xanthine oxidase with calf thymus DNA: Multi-spectroscopic methodologies and molecular docking. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2022; 41:605-624. [PMID: 35410587 DOI: 10.1080/15257770.2022.2057534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 03/01/2022] [Accepted: 03/19/2022] [Indexed: 06/14/2023]
Abstract
In this paper, the interacting characteristics of febuxostat (FBST), an inhibitor of xanthine oxidase for treating gout patients with hyperuricemia with calf thymus DNA (ctDNA) was investigated through multi-spectroscopic methodologies combined with theoretical calculation for understanding the interacting mode on ctDNA, affinity with ctDNA, interacting forces, as well as the alteration in the conformation of ctDNA after interacting FBST The experimental results demonstrated that interacting FBST with ctDNA formed 1:1 complex, the association constant was 913 M-1 at 298 K, suggesting the affinity of FBST on ctDNA was very weak, the interacting mode of FBST on ctDNA was groove binding, and it inserted into the minor groove with rich A-T region of ctDNA. Based on the results of the thermodynamic analysis and theoretical calculation, it can be inferred that the dominated interacting forces between FBST and ctDNA were van der Waals forces and hydrogen bond. And, interacting FBST with ctDNA was a spontaneous, enthalpy-driven, and exothermic process because of ΔG0 < 0, ΔH0 < 0, and |ΔH0| > T|ΔS0|. The results of the circular dichroism (CD) measurements indicated the conformation of ctDNA was weakly disturbed after interacting with FBST but still maintained B-conform. The studied results offer significant insight into further clarifying whether it has genotoxicity.
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Affiliation(s)
- Xin-Yan Lu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, China
| | - Yan-Yue Lou
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, China
| | - Kai-Li Zhou
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, China
| | - Shao-Liang Jiang
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, China
| | - Jie-Hua Shi
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou, China
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10
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Goswami S, Ghosh R, Prasanthan P, Kishore N. Mode of interaction of altretamine with calf thymus DNA: biophysical insights. J Biomol Struct Dyn 2022; 41:3728-3740. [PMID: 35343872 DOI: 10.1080/07391102.2022.2054472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Insights into drug-DNA interactions have importance in medicinal chemistry as it has a major role in the evolution of new therapeutic drugs. Therefore, binding studies of small molecules with DNA are of significant interest. Spectroscopy, coupled with measurements of viscosity and molecular docking studies were employed to obtain mechanistic insights into the binding of altretamine with calf thymus DNA (CT-DNA). The UV-visible spectroscopic measurements study confirmed altretamine-CT-DNA complex formation with affinity constant ([15.68 ± 0.04] × 103 M-1), a value associated with groove binding phenomenon. The associated thermodynamic signatures suggest enthalpically driven interactions. The values of standard molar free energy change (ΔGmo) -(23.93 ± 0.23) kJ mol-1, enthalpy change (ΔvHHmo) -(50.84 ± 0.19) kJ mol-1 and entropy change (ΔSmo) -(90.29 ± 0.12) JK-1 mol-1 indicate the binding is thermodynamically favorable and an important role of the hydrogen bonds and Van der Waals interactions in the binding of altretamine with CT-DNA. Circular dichroism spectroscopy indicated insignificant conformational changes in the DNA backbone upon interaction with altretamine suggesting no distortion and/or unstacking of the base pairs in the DNA helix. UV-melting study suggested that the thermal stability of the DNA backbone is not affected by the binding of the drug. Competitive displacement assays with ethidium bromide, Hoechst-33258 and DAPI established the binding of altretamine with CT-DNA in the minor groove. The mode of binding was further confirmed by viscosity and molecular docking studies. Molecular docking further ascertained binding of altretamine in the minor groove of the CT-DNA, preferably with the A-T rich sequences.
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Affiliation(s)
- Sathi Goswami
- Department of Chemistry, Indian Institute of Technology Bombay, Maharashtra, India
| | - Ritutama Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Maharashtra, India
| | - Pooja Prasanthan
- Department of Chemistry, Indian Institute of Technology Bombay, Maharashtra, India
| | - Nand Kishore
- Department of Chemistry, Indian Institute of Technology Bombay, Maharashtra, India
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Ponkarpagam S, Vennila KN, Elango KP. Investigating binding of insecticide buprofezin to DNA by experimental and metadynamics simulation studies. J Biomol Struct Dyn 2022; 41:3476-3484. [PMID: 35285769 DOI: 10.1080/07391102.2022.2050949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Buprofezin (BUP) is an insecticide which belongs to the thiadiazine structural family and known to damage DNA in mice. Though its toxic effect on human is not known clearly, understanding the mechanism of interaction of BUP with DNA can prove useful when required. Multi-spectroscopic experiments such as UV-Vis, fluorescence, circular dichroism (CD) and 1H NMR coupled with viscosity measurements, urea effect and voltametric studies were performed to ascertain the mode of binding of BUP with calf thymus DNA (CT-DNA). Analysis of UV-Vis and fluorescence spectra indicated the formation of a complex between BUP and CT-DNA. Other experiments such as competitive binding assays with ethidium bromide (EB) and Hoechst 33258, viscosity measurements, effect of urea, CD, voltammetric studies and 1H NMR spectral analysis suggested that BUP intercalates into the base pairs of CT-DNA. All these results revealed that the binding mode of BUP with CT-DNA should be intercalation and the binding constant is in the order of 104 M-1. The ΔHo < 0 and ΔSo < 0 suggested that H-bonding or van der Waals force was the main binding force between BUP and CT-DNA. The proposed mode of binding of BUP with CT-DNA has been visualized using in silico molecular docking and metadynamics simulation studies, which showed that the phenyl ring of BUP binds to CT-DNA via π-π stacking interaction in addition to H-bond formation.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- S Ponkarpagam
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - K N Vennila
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
| | - Kuppanagounder P Elango
- Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram, India
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12
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Hu Q, Sun H, Liu L, Xiao L, Yang ZQ, Rao S, Gong X, Han J. Development of an ultrasensitive spectrophotometric method for carmine determination based on fluorescent carbon dots. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2021; 38:731-740. [PMID: 33684336 DOI: 10.1080/19440049.2021.1889045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A high-efficiency spectrophotometric method based on nitrogen-doped fluorescent carbon dots (N-FCDs) was developed for the ultrasensitive determination of carmine (CRM) in foodstuffs. The N-FCDs were fabricated via a one-pot hydrothermal method with m-phenylenediamine as the starting material. The detection principle was based on the fluorescence quenching effect of N-FCDs by CRM, where their interaction was due to the inner filter effect (IFE) and static quenching. A good linear relationship was established for CRM detection in a concentration range of 0.1-10.0 μM with a detection limit as low as 11.2 nM. The proposed method achieved satisfactory results for CRM determination in commercial food products with recoveries better than 98.6% and relative standard deviations (RSDs) less than 4.07%. The method established in this study was simple, ultrasensitive and reliable for rapid detecting CRM in a food matrix, which could be potentially used as a useful sensing agent for the analysis of additive food colourants.
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Affiliation(s)
- Qin Hu
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Huijuan Sun
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Lingfei Liu
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Lixia Xiao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Zhen-Quan Yang
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Shengqi Rao
- College of Food Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China.,Jiangsu Key Laboratory of Dairy Biotechnology and Safety Control, Yangzhou University, Yangzhou 225127, Jiangsu, China
| | - Xiaojuan Gong
- Institute of Environmental Science, and School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China
| | - Jie Han
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225001, PR China
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13
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Hosseinzadeh S, Eslami Moghadam M, Sheshmani S, Shahvelayati AS. New anticancer Pd and Pt complexes of tertamyl dithiocarbamate and DACH ligands against HT29 and Panc1 cell lines. J Biomol Struct Dyn 2021; 40:6910-6920. [PMID: 33645454 DOI: 10.1080/07391102.2021.1891972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
To investigate the reduction of side effects of commercial antitumor drugs such as cisplatin, two new platinum and palladium complexes with a formula of [M(DACH)(tertamyl.dtc)]NO3 were synthesized (DACH is 1R, 2R-diaminocyclohexane, tertamyl-dtc is tertpentyl dithiocarbamate, and M is palladium or platin ionic metals) and characterized by spectroscopic methods. The in vitro cytotoxicity of these compounds against HT29 and Panc1 cell lines showed that the IC50 values against Panc1 cell line of [Pt(DACH)(tertamyl.dtc)]NO3 and [Pd(DACH)(tertamyl.dtc)]NO3 were 263.1 and 198.7 µM, and also against HT29 cell line were 241.9 and 258.2 µM, respectively. They were similar to the value obtained for oxaliplatin and lower than cisplatin value. Thermal stability and circular dichroism results demonstrated that both metal complexes could bind to DNA via electrostatic bonds. Due to electrostatic interaction, the configuration of B-DNA to C-DNA changed, though the possibility of groove interaction may be strengthened. Furthermore, molecular docking simulation showed higher negative docking energy for [Pd(DACH)(tertamyl.dtc)]NO3 complex with a higher tendency for DNA interaction. In vitro cytotoxicity of two new Pt and Pd compounds have been studied against two cell lines (HT29 and Panc 1), which are almost equal to the value obtained for oxaliplatin and they are lower than cisplatin value. Thermal stability studies and CD results demonstrated that both complexes bind to DNA via electrostatic bonds. Further, molecular docking showed higher negative docking energy for [Pd(DACH)(tertamyl.dtc)]NO3 complex with a higher tendency for interaction.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Soudeh Hosseinzadeh
- Department of Chemistry, College of Basic Sciences, Yadeghar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
| | | | - Shabnam Sheshmani
- Department of Chemistry, College of Basic Sciences, Yadeghar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
| | - Ashraf S Shahvelayati
- Department of Chemistry, College of Basic Sciences, Yadeghar-e-Imam Khomeini (RAH) Shahre Rey Branch, Islamic Azad University, Tehran, Iran
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