51
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Gupta N, Bhagyawant SS. Bioactive peptide of Cicer arietinum L. induces apoptosis in human endometrial cancer via DNA fragmentation and cell cycle arrest. 3 Biotech 2021; 11:63. [PMID: 33489681 PMCID: PMC7803852 DOI: 10.1007/s13205-020-02614-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 12/24/2020] [Indexed: 01/25/2023] Open
Abstract
Chickpea seed proteins are alleged source of nutraceuticals. These seed proteins were subjected to different proteases to produce peptides. The efficacy of these peptides was confirmed using six diverse human cancer cell lines (PA-1, Ishikawa cells, A549, MCF-7, HepG2, MDA-MB-231). Alcalase generated peptides exhibited the highest antagonistic inhibition of Ishikawa cells. Flow cytometric analysis revealed that chickpea peptide induced S and G2 phase arrest of cell cycle in a dose dependent manner. DNA fragmentation and apoptosis occurred by down regulation of Bcl-2 expression, upregulation of Bax expression and promotion of caspase-3 initiation. Chickpea peptides ascertain potential antiproliferative molecule that can be deployed in cancer treatment regimes.
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Affiliation(s)
- Neha Gupta
- School of Studies in Biotechnology, Jiwaji University, Gwalior, 474011 Madhya Pradesh India
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Parvizi N, Mohammad-Aghaie D, Soltani Rad MN, Behrouz S, Alavianmehr MM. Shedding light on the bimolecular interactions of Cafaminol and human serum albumin: spectroscopic characterization and in-silico investigation. J Biomol Struct Dyn 2021; 40:4893-4904. [PMID: 33390094 DOI: 10.1080/07391102.2020.1863262] [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
Cafaminol, also known as methylcoffanolamine, is a vasoconstrictor and anticatarrhal of the methylxanthine family, which is used as a nasal decongestant. This study aimed to investigate the interaction mechanisms of human serum albumin (HSA) with Cafaminol, through several spectroscopic (fluorescence quenching, UV-visible absorption, and circular dichroism (CD) spectroscopies) and molecular modeling techniques. Stern-Volmer plots were employed to specify the fluorescence quenching mechanism, while the simulation methods were utilized to deduce the approximate binding position of Cafaminol on HSA. On the other hand, thermodynamic parameters, enthalpy and entropy changes, were determined to be, respectively, -105.88 (kJ mol-1) and -282.34 (J mol-1 K-1), using the Van't Hoff equation and analyzed later to specify the main acting forces between Cafaminol and HSA. Overall results revealed the binding of Cafaminol to the site I of HSA, as a result of an enthalpy-driven process, mainly through the van der Waals and hydrogen bonding interactions. Static quenching mechanism was found to be responsible for the fluorescence quenching of HSA in the Cafaminol presence, while the number of binding sites and apparent binding constant were measured accordingly. Docking results proposed that Cafaminol and HSA interact with a binding free energy (ΔG) of -6.5 kcal mol-1Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Negar Parvizi
- Department of Chemistry, Shiraz University of Technology, Shiraz, Iran
| | | | | | - Somayeh Behrouz
- Department of Chemistry, Shiraz University of Technology, Shiraz, Iran
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Lee S, Kim H. Crosslinking of Streptavidin–Biotinylated Bovine Serum Albumin Studied with Fluorescence Correlation Spectroscopy. B KOREAN CHEM SOC 2020. [DOI: 10.1002/bkcs.12164] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sujin Lee
- Department of Chemistry, College of Science and Technology Duksung Women's University Seoul 01369 Republic of Korea
| | - Hahkjoon Kim
- Department of Chemistry, College of Science and Technology Duksung Women's University Seoul 01369 Republic of Korea
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Badar A, Arif Z, Qais FA, Islam SN, Alam K. Carbamylation of human serum albumin generates high-molecular weight aggregates: fine characterization by multi-spectroscopic methods and electron microscopy. Int J Biol Macromol 2020; 164:2380-2388. [PMID: 32795577 DOI: 10.1016/j.ijbiomac.2020.08.083] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 07/08/2020] [Accepted: 08/08/2020] [Indexed: 02/08/2023]
Abstract
Carbamylation is the non-enzymatic reaction between isocyanic acid and macromolecules (mainly proteins) which results in carbamylation-derived products (CDPs) generation, wherein the macromolecules show altered structure and function. In this study, we examined the modifications caused in human serum albumin (HSA) upon interaction with potassium cyanate (KCNO). HSA was incubated with varying concentrations of KCNO for 6 h at 37 °C. The resultant product was characterized by biochemical and biophysical techniques. Among other changes, the carbamylated-HSA showed homocitrulline generation (LC-MS), increase in mass (DLS), and amyloidogenic aggregate formation (Congo red, SEM, TEM). The Gibb's free energy was calculated to be -2.91 to -3.95 kcal mol-1, suggesting that the binding was spontaneous and energetically favourable. The results indicate that in chronic kidney disease patients, elevated levels of isocyanic acid (formed from urea) may modify the albumin structure and lead to its conversion into amyloidogenic aggregates, thus accelerating kidney damage.
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Affiliation(s)
- Asim Badar
- Department of Biochemistry, Faculty of Medicine, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Zarina Arif
- Department of Biochemistry, Faculty of Medicine, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Faizan Abul Qais
- Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Shireen Naaz Islam
- Department of Biochemistry, Faculty of Medicine, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Khursheed Alam
- Department of Biochemistry, Faculty of Medicine, Jawaharlal Nehru Medical College, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.
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Zhao YY, Fan Y, Wang M, Wang J, Cheng JX, Zou JB, Zhang XF, Shi YJ, Guo DY. Studies on pharmacokinetic properties and absorption mechanism of phloretin: In vivo and in vitro. Biomed Pharmacother 2020; 132:110809. [DOI: 10.1016/j.biopha.2020.110809] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 09/17/2020] [Accepted: 09/25/2020] [Indexed: 12/17/2022] Open
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Thermodynamic analysis of albumin interaction with monosodium glutamate food additive: Insights from multi-spectroscopic and molecular docking approaches. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128785] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Ji C, Yin X, Duan H, Liang L. Molecular complexes of calf thymus DNA with various bioactive compounds: Formation and characterization. Int J Biol Macromol 2020; 168:775-783. [PMID: 33227330 DOI: 10.1016/j.ijbiomac.2020.11.135] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 11/18/2020] [Accepted: 11/18/2020] [Indexed: 10/22/2022]
Abstract
The interaction between biomacromolecules and ligands has attracted great interest because of their biological properties. Calf thymus DNA (ctDNA) can interact with bioactive compounds to form complexes. Here, ctDNA-ligand complexes were studied using fluorescence, absorption, and infrared spectroscopy, circular dichroism, ABTS assay and competitive displacement. The binding constants of bioactive compounds at the intercalative site of ctDNA ranked in order kaempferol > apigenin > quercetin > curcumin > riboflavin, while the binding constants at minor groove sites ranked quercetin > kaempferol > naringenin ~ apigenin > hesperetin > curcumin ~ resveratrol ~ riboflavin > caffeic acid. CtDNA maintained stable B-form with an enhancement of base stacking and a decrease of right-handed helicity in the presence of these bioactive compounds, except for hesperetin and caffeic acid. Bioactive compounds preferentially bound to guanine bases and tended to transfer into a more hydrophobic environment upon complexation with ctDNA. The DNA complexation did not affect the ABTS·+ scavenging capacity of quercetin, kaempferol, resveratrol and apigenin but increased the ones of naringenin, caffeic acid, curcumin, hesperetin and riboflavin. The data gathered here should be useful to understand the binding modes of DNA with ligands for their potential application in pharmaceutical and food industries.
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Affiliation(s)
- Chuye Ji
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Xin Yin
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China
| | - Hongwei Duan
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore
| | - Li Liang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China; School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China.
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Starykovych M, Antonyuk V, Nehrych T, Negrych N, Horák D, Souchelnytskyi S, Kit O, Stoika R, Kit Y. Isolation and identification in human blood serum of the proteins possessing the ability to bind with 48 kDa form of unconventional myosin 1c and their possible diagnostic and prognostic value. Biomed Chromatogr 2020; 35:e5029. [PMID: 33201534 DOI: 10.1002/bmc.5029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/05/2020] [Accepted: 11/12/2020] [Indexed: 11/05/2022]
Abstract
We firstly identified 48 kDa molecular form of the unconventional myosin 1c (p48/Myo1C), and isolated it from blood serum of multiple sclerosis patients. The amount of p48/Myo1C in human blood serum correlated with some autoimmune, hemato-oncological and neurodegenerative diseases and thus may serve as a potential molecular biomarker. The biological functions of this protein in human blood remain unknown. Previously, we used the monodisperse magnetic poly (glycidyl methacrylate)(mag-PGMA-NH2 ) microspheres with immobilized 48/Myo1C and western-blot analysis, which allowed us to identify IgM and IgG immunoglobulins presenting an affinity to this protein. Here, we used mass spectrometry followed by the western blotting in order to identify other blood serum proteins with affinity to 48/Myo1C. The obtained data demonstrate that 48/Myo1C binds to component 3 of the complement and the antithrombin-III proteins. A combination of magnetic microparticle-based affinity chromatography with MALDI-TOF mass spectrometry and an in silico analysis provided an opportunity to identify the partners of interaction of 48/Myo1C with other proteins, in particular those participating in complement and coagulation cascades.
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Affiliation(s)
- Marina Starykovych
- Institute of Cell Biology, Nationa Academy of Sciences of Ukraine, Drahomanov st., 14\16, Lviv, Ukraine
| | - Volodymyr Antonyuk
- Institute of Cell Biology, Nationa Academy of Sciences of Ukraine, Drahomanov st., 14\16, Lviv, Ukraine
| | - Tetyana Nehrych
- Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - Nazar Negrych
- Danylo Halytsky Lviv National Medical University, Lviv, Ukraine
| | - Daniel Horák
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | | | - Oleg Kit
- Lviv Institute of the Interregional Academy of Personnel Management, Ukraine
| | - Rostyslav Stoika
- Institute of Cell Biology, Nationa Academy of Sciences of Ukraine, Drahomanov st., 14\16, Lviv, Ukraine
| | - Yuriy Kit
- Institute of Cell Biology, Nationa Academy of Sciences of Ukraine, Drahomanov st., 14\16, Lviv, Ukraine
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Ying Y, Wan H, Zhao X, Yu L, He Y, Jin W. Pharmacokinetic-Pharmacodynamic Modeling of the Antioxidant Activity of Quzhou Fructus Aurantii Decoction in a Rat Model of Hyperlipidemia. Biomed Pharmacother 2020; 131:110646. [PMID: 32942150 DOI: 10.1016/j.biopha.2020.110646] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 08/03/2020] [Accepted: 08/16/2020] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Quzhou Fructus Aurantii (QFA) is an herb that is commonly used to alleviate inflammation in individuals dealing with obesity.To date, however, no systematic pharmacokinetic (PK) or pharmacodynamic (PD) analyses of the clinical efficacy of QFA under hyperlipemia-associated oxidative stress conditions have been conducted. The present study, was therefore designed to construct a PK-PD model for this herb, with the goal of linking QFA PK profiles to key therapeutic outlines to guide the therapeutic use of this herb in clinical settings. METHODS Rats were fed a high-fat diet in order to establish a model of hyperlipidemia, after which they were randomized into a normal control group (NCG), a normal treatment group (NTG), a model control group (MCG), and a model treated group (MTG) (n = 6 each). QAF decoction was used to treat rats in the NTG and MTG groups (25 g/kg), while equivalent volumes of physiological saline were administered to rats in the NCG and MCG groups. Plasma samples were collected from the mandibular vein for animals at appropriate time points and analyzed via high-performance liquid chromatography (HPLC). We evaluated PK properties for three QAF components and compared these dynamics between the NTG and MTG groups, while also measuring levels of lipid peroxidation (LPO) in the plasma of rats in all four treatment groups. We then constructed a PK-PD model based upon plasma neohesperidin, luteolin, and nobiletin concentrations and LPO levels using a three-compartment PK model together with a Sigmoid Emax PD model. This model thereby enabled us to assess the antioxidative impact of neohesperidin, luteolin, and nobiletin on hyperlipidemia in rats. RESULTS When comparing the NTG and MTG groups, we detected significant differences in the following parameters pertaining to neohesperidin, luteolin, and nobiletin:t1/2β, V1, t1/2γ, CL1 (p < 0.01) and AUC0-t, Tmax, Cmax (p < 0.05). Relative to NTG group rats, AUC0-t, TmaxandCmaxvalues significantly higher for MTG group rats (p < 0.01), while t1/2β, V1, and t1/2γ values were significantly lower in MTG group rats (p < 0.01) in MTG rats. QAF decoction also exhibited excellent PD efficacy in MTG rats, with significant reductions in plasma LPO levels relative to NTG rats (p < 0.01) following treatment. This therapeutic efficacy may be attributable to the activity of neohesperidin, luteolin, and nobiletin, as LPO levels and plasma concentrations of these compounds were negatively correlated in treated rats. Based upon Akaike Information Criterion (AIC) values, we determined that neohesperidin, luteolin, and nobiletin PK processes were consistent with a three-compartment model. Together, these findings indicated that three active components in QAF decoction (neohesperidin, luteolin, and nobiletin) may exhibit antioxidant activity in vivo. CONCLUSION Our in vivo data indicated that neohesperidin, luteolin and nobiletin components of QAF decoctions exhibit distinct PK and PD properties. Together, these findings suggest that hyperlipidemia-related oxidative stress can significantly impact QFA decoction PK and PD parameters. Our data additionally offer fundamental insights that can be used to design appropriate dosing regimens for individualized clinical QAF decoction treatment.
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Affiliation(s)
- Yuqi Ying
- The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - Haoyu Wan
- College of Medical Technology, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - Xixi Zhao
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - Li Yu
- College of Life Science, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - Yu He
- College of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
| | - Weifeng Jin
- College of Pharmaceutical Science, Zhejiang Chinese Medical University, Hangzhou 310053, Zhejiang, China.
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Huang L, Yang C, Wang Y, Li G, Pan J, Luo H, Wu Z, Tian Y, Chen S, Chen J, Jian Z. Anterior gradient 2 is a novel pro-tumor factor in pancreatic cancer under NF-κB subunit RelA trans-regulation that can be suppressed by eugenic acid. Biomed Pharmacother 2020; 132:110830. [PMID: 33059262 DOI: 10.1016/j.biopha.2020.110830] [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] [Received: 06/20/2020] [Revised: 09/18/2020] [Accepted: 09/28/2020] [Indexed: 10/23/2022] Open
Abstract
This study aimed to examine eugenic acid (EA) as an alternative therapeutic approach against pancreatic cancer. The pancreatic cancer xenograft mouse model was employed to determine the impacts of treatment with EA on the growth of tumors. Expressions of NF-κB subunit RelA as well as Anterior gradient 2 (AGR2) were quantified in pancreatic cells treated with EA. Chromatin immunoprecipitation and luciferase report assay were performed to examine the regulation of AGR2 by RelA. The function of AGR2 as a downstream effector EA treatment was further assessed through overexpression of AGR2 in pancreatic cells. EA suppressed the growth of xenograft pancreatic tumor, and promoted the overall survival of animals with xenograft tumors. Furthermore, EA downregulated the expression of AGR2 in pancreatic cancer cells via the RelA binding site. Ectopic AGR2 overexpression attenuated the EA-elicited inhibition on the growth of xenograft pancreatic tumor, and negated the EA-induced enhancement of mouse survival. EA ameliorates pancreatic cancer through suppression of AGR2 expression, and future studies in clinical settings are needed to further assess the anti-cancer efficacy of EA.
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Affiliation(s)
- Long Huang
- The Second School of Clinical Medicine, Southern Medical University, No.1023 South Shatai Road, Baiyun District, Guangzhou, 510515 Guangdong, China; Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106 Zhongshan Er Road, Guangzhou, 510080 Guangdong, China; Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Can Yang
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Yaodong Wang
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Ge Li
- Department of Hepatobiliary Surgery, Union Hospital, Fujian Medical University, Fuzhou, 350001 Fujian, China
| | - Jingjing Pan
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Huatian Luo
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Zhangwei Wu
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Yifeng Tian
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Shi Chen
- Department of Hepatobiliary Surgery, Fujian Provincial Hospital, Fujian Medical University, NO.134, East Street, Fuzhou, 350001 Fujian, China
| | - Jiangzhi Chen
- Department of Hepatobiliary Surgery, Union Hospital, Fujian Medical University, Fuzhou, 350001 Fujian, China.
| | - Zhixiang Jian
- The Second School of Clinical Medicine, Southern Medical University, No.1023 South Shatai Road, Baiyun District, Guangzhou, 510515 Guangdong, China; Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, No. 106 Zhongshan Er Road, Guangzhou, 510080 Guangdong, China.
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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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Ding F, Peng W, Peng YK, Liu BQ. Elucidating the potential neurotoxicity of chiral phenthoate: Molecular insight from experimental and computational studies. CHEMOSPHERE 2020; 255:127007. [PMID: 32416396 DOI: 10.1016/j.chemosphere.2020.127007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 06/11/2023]
Abstract
Chiral organophosphorus pollutants are existed ubiquitously in the ecological environment, but the enantioselective toxicities of these nerve agents to humans and their molecular bases have not been fully elucidated. Using experimental and computational approaches, this story was to explore the neurotoxic response process of the target acetylcholinesterase (AChE) to chiral phenthoate and further decipher the microscopic mechanism of such toxicological effect at the enantiomeric level. The results showed that the toxic reaction of AChE with chiral phenthoate exhibited significant enantioselectivity, and (R)-phenthoate (K=1.486 × 105 M-1) has a bioaffinity for the nerve enzyme nearly three times that of (S)-phenthoate (K=4.503 × 104 M-1). Dynamic research outcomes interpreted the wet experiments, and the inherent conformational flexibility of the target enzyme has a great influence on the enantioselective neurotoxicological action processes, especially reflected in the conformational changes of the three key loop regions (i.e. residues His-447, Gly-448, and Tyr-449; residues Gly-122, Phe-123, and Tyr-124; and residues Thr-75, Leu-76, and Tyr-77) around the reaction patch. This was supported by the quantitative results of conformational studies derived from circular dichroism spectroscopy (α-helix: 34.7%→30.2%/31.6%; β-sheet: 23.6%→19.5%/20.7%; turn: 19.2%→22.4%/21.9%; and random coil: 22.5%→27.9%/25.8%). Meanwhile, via analyzing the modes of toxic action and free energies, we can find that (R)-phenthoate has a strong inhibitory effect on the enzymatic activity of AChE, as compared with (S)-phenthoate, and electrostatic energy (-23.79/-17.77 kJ mol-1) played a critical role in toxicological reactions. These points were the underlying causes of chiral phenthoate displaying different degrees of enantioselective neurotoxicity.
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Affiliation(s)
- Fei Ding
- Department of Environmental Science and Engineering, School of Water and Environment, Chang'an University, Xi'an, 710054, China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, No. 126 Yanta Road, Yanta District, Xi'an, 710054, China
| | - Wei Peng
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
| | - Yu-Kui Peng
- Center for Food Quality Supervision, Inspection & Testing, Ministry of Agriculture and Rural Affairs, Northwest A&F University, Yangling, 712100, China
| | - Bing-Qi Liu
- Department of Agricultural Chemistry, Qingdao Agricultural University, Qingdao, 266109, China
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Salih M, Walvekar P, Omolo CA, Elrashedy AA, Devnarain N, Fasiku V, Waddad AY, Mocktar C, Govender T. A self-assembled polymer therapeutic for simultaneously enhancing solubility and antimicrobial activity and lowering serum albumin binding of fusidic acid. J Biomol Struct Dyn 2020; 39:6567-6584. [PMID: 32772814 DOI: 10.1080/07391102.2020.1803140] [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: 10/23/2022]
Abstract
The global antimicrobial resistance crisis has prompted worldwide efforts to develop new and more efficient antimicrobial compounds, as well as to develop new drug delivery strategies and targeting mechanisms. This study aimed to synthesize a novel polyethylene glycol-fusidic acid (PEG-FA) conjugate for self-assembly into nano-sized structures and explore its potential for simultaneously enhancing aqueous solubility and antibacterial activity of FA. In addition, the ability of PEG-FA to bind to HSA with lower affinity than FA is also investigated. Haemolysis and in vitro cytotoxicity studies confirmed superior biosafety of the novel PEG-FA compared to FA. The water solubility of FA after PEG conjugation was increased by 25-fold compared to the bare drug. PEG-FA nanoparticles displayed particle size, polydispersity index and zeta potential of 149.3 ± 0.21 nm, 0.267 ± 0.01 and 5.97 ± 1.03 mV, respectively. Morphology studies using high-resolution transmission electron microscope revealed a homogenous spherical shape of the PEG-FA nanoparticles. In silico studies showed that Van der Waals forces facilitated PEG-FA self-assembly. HSA binding studies showed that PEG-FA had very weak or no interaction with HSA using in silico molecular docking (-2.93 kcal/mol) and microscale thermophoresis (Kd=14999 ± 1.36 µM), which may prevent bilirubin displacement. Conjugation with PEG did not inhibit the antibacterial activity of FA but rather enhanced it by 2.5-fold against Staphylococcus aureus and methicillin-resistant Staphylococcus aureus, compared to the bare FA. These results show that PEG-FA can simultaneously enhance solubility and antibacterial activity of FA, whilst also reducing binding of HSA to decrease its side effects.
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Affiliation(s)
- Mohammed Salih
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Pavan Walvekar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Calvin A Omolo
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa.,Department of Chemistry of Natural and Microbial Products, Division of Pharmaceutical and Drug Industries, National Research Centre, Cairo, Egypt
| | - Ahmed A Elrashedy
- School of Pharmacy and Health Sciences, United States International University, Nairobi, Kenya
| | - Nikita Devnarain
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Victoria Fasiku
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Ayman Y Waddad
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Chunderika Mocktar
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Thirumala Govender
- Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
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Li C, Chen W, Zhang M, Zhang C, Cao B, Dong B, Qi S, Zhang Y, Fei X, Li X, Li R, Wang J, Li G. Modulatory effects of Xihuang Pill on lung cancer treatment by an integrative approach. Biomed Pharmacother 2020; 130:110533. [PMID: 32739739 DOI: 10.1016/j.biopha.2020.110533] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/05/2020] [Accepted: 07/11/2020] [Indexed: 12/17/2022] Open
Abstract
Lung cancer has a rapidly increasing incidence and remains the highest ranked cancer in terms of mortality worldwide. Xihuang Pill(XHW), a famous four-herb traditional Chinese formulation, has been used to treat lung cancer in China for more than 100 years. It is usually prescribed as a complementary and alternative medicine for cancer therapy. However, the main active ingredients of XHW that treat lung cancer and their regulatory effects remain unclear. Here, we revealed modulatory effects effects of XHW on lung cancer in a mouse model of Lewis lung cancer (LLC) by a comprehensive strategy combining network pharmacology with metabolomics. The results demonstrated that XHW inhibited tumour growth in this model. Additionally, 11 differentially expressed metabolites were identified in the XHW group compared to those in the model group or normal group by untargeted metabolomics. They were enriched in amino acid-related metabolic pathways, and the top three pathways were phenylalanine metabolism; phenylalanine, tyrosine and tryptophan biosynthesis; and aminoacyl-tRNA biosynthesis. A total of 107 active components derived from Niuhuang, Shexiang, Ruxiang and Moyao, directly acted on 13 important targets (NR3C2, AKR1D1, MPO, PNP, NT5E, TAAR1, ADRB2, ADRB1, ADRA1A, ADRA2B, ADRA2A, MAOA and MAOB) to regulate 4 metabolites (L-phenylalanine, l-adrenaline, corticosterone and guanosine). Our results suggested that the key metabolites of XHW involved in the treatment of lung cancer were regulated by a multi-component and multi-target interaction network. This research elucidated the modulatory effect and therapeutic advantages of XHW treatment for lung tumours through an integrated approach.
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Affiliation(s)
- Chunyu Li
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Wei Chen
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Mingyu Zhang
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Congen Zhang
- Beijing Friendship Hospital, Capital Medical University, Beijing, 100050, China
| | - Bo Cao
- Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Bin Dong
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Shuya Qi
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Yujun Zhang
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Xiaofei Fei
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China
| | - Xingjie Li
- Research Center for Clinical and Translational Medicine, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100039, China
| | - RuiSheng Li
- Research Center for Clinical and Translational Medicine, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100039, China
| | - Jiabo Wang
- China Military Institute of Chinese Medicine, Fifth Medical Center of Chinese PLA General Hospital, Beijing, 100039, China.
| | - Guohui Li
- National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100021, China.
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65
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Rane JS, Pandey P, Chatterjee A, Khan R, Kumar A, Prakash A, Ray S. Targeting virus-host interaction by novel pyrimidine derivative: an in silico approach towards discovery of potential drug against COVID-19. J Biomol Struct Dyn 2020; 39:5768-5778. [PMID: 32684109 PMCID: PMC7441775 DOI: 10.1080/07391102.2020.1794969] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The entire human population over the globe is currently facing appalling conditions due
to the spread of infection from coronavirus disease-2019 (COVID-19). The spike
glycoprotein of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) present on
the surface of the virion mediates the virus entry into the host cells and therefore is
targeted by several scientific groups as a novel drug target site. The spike glycoprotein
binds to the human angiotensin-converting enzyme-2 (hACE2) cell surface receptor
abundantly expressed in lung tissues, and this binding phenomenon is a primary determinant
of cell tropism and pathogenesis. The binding and internalization of the virus is the
primary and most crucial step in the process of infection, and therefore the molecules
targeting the inhibition of this process certainly hold a significant therapeutic value.
Thus, we systematically applied the computational techniques to identify the plausible
inhibitor from a chosen set of well characterized diaryl pyrimidine analogues which may
disrupt interfacial interaction of spike glycoprotein (S) at the surface of hACE2. Using
molecular docking, molecular dynamics (MD) simulation and binding free energy calculation,
we have identified AP-NP (2-(2-amino-5-(naphthalen-2-yl)pyrimidin-4-yl)phenol),
AP-3-OMe-Ph (2-(2-amino-5-(3-methoxyphenyl)pyrimidin-4-yl)phenol) and AP-4-Me-Ph
(2-(2-amino-5-(p-tolyl) pyrimidin-4-yl)phenol) from a group of diaryl pyrimidine
derivatives which appears to bind at the interface of the hACE2-S complex with low binding
free energy. Thus, pyrimidine derivative AP-NP may be explored as an effective inhibitor
for hACE2-S complex. Furthermore, in vitro and in vivo studies will strengthen the use of these inhibitors as
suitable drug candidates against SARS-COV-2. Communicated by Ramaswamy H. Sarma
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Affiliation(s)
- Jitendra Subhash Rane
- Department of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai, India
| | - Preeti Pandey
- Department of Chemistry & Biochemistry, University of Oklahoma, Norman, OK, USA
| | - Aroni Chatterjee
- Indian Council of Medical Research (ICMR)-Virus Research Laboratory, NICED, Kolkata, India
| | - Rajni Khan
- Motihari College of Engineering, Motihari, India
| | - Abhijeet Kumar
- Department of Chemistry, Mahatma Gandhi Central University, Motihari, India
| | - Amresh Prakash
- Amity Institute of Integrative Sciences and Health, Amity University Haryana, Gurgaon, India
| | - Shashikant Ray
- Department of Biotechnology, Mahatma Gandhi Central University, Motihari, India
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66
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Synthesis, crystal structure, bovine serum albumin binding studies of 1,2,4-triazine based copper(I) complexes. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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67
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He LL, Qi Q, Wang X, Li Y, Zhu Y, Wang XF, Xu L. Synthesis of two novel pyrazolo[1,5-a]pyrimidine compounds with antibacterial activity and biophysical insights into their interactions with plasma protein. Bioorg Chem 2020; 99:103833. [PMID: 32305694 DOI: 10.1016/j.bioorg.2020.103833] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 03/17/2020] [Accepted: 04/06/2020] [Indexed: 12/11/2022]
Abstract
Two novel water-soluble pyrazolo[1,5-a]pyrimidine derivatives, 5-chloro-7-(4-methyl-piperazin -1-yl)-pyrazolo[1,5-a]pyrimidine (CMPS) and N'-(5-chloro-pyrazolo[1,5-a]pyrimidin-7-yl)-N,N-dimethyl -propane-1,3-diamine (NCPS), were synthesized and characterized with antibacterial activity. Then, the interactions of these compounds with bovine serum albumin (BSA) were studied by fluorescence, time-resolved fluorescence, circular dichroism (CD) spectroscopy and molecular docking. The results indicate that both CMPS and NCPS could effectively quench the intrinsic fluorescence of BSA via a static quenching process. The energy transfer from BSA to CMPS and NCPS may occur with high probability. Both CMPS and NCPS bind in the site I of BSA. The hydrophobic force and hydrogen bonds play major roles in the complex formation. Binding constants for both systems show that the affinity of CMPS binding to BSA is stronger than that of NCPS. The results of three-dimensional fluorescence and CD spectra reveal that the binding of CMPS and NCPS to BSA can induce conformational changes of BSA, and the influence of CMPS is slightly stronger than that of NCPS.
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Affiliation(s)
- Ling-Ling He
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Qi Qi
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Xin Wang
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, China.
| | - Yu Li
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Yao Zhu
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, China
| | - Xiao-Fang Wang
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, China
| | - Liang Xu
- School of Pharmaceutical Sciences, Liaoning University, Shenyang 110036, China.
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68
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Wang Y, Han Q, Zhang G, Zhang H. Evaluation of the binding mechanism of iodine with trypsin and pepsin: A spectroscopic and molecular docking. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 230:118036. [PMID: 31931358 DOI: 10.1016/j.saa.2020.118036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 12/28/2019] [Accepted: 01/03/2020] [Indexed: 06/10/2023]
Abstract
In this work, the effects of I2 on the activities and conformational structures of digestive enzymes, trypsin and pepsin were studied. The results indicated that the enzyme activities were decreased to some extent in the presence of I2, especially trypsin. Upon gradual addition of I2, the intrinsic fluorescence quenching of trypsin and pepsin were observed by mainly static collision and hydrophobic forces. I2 is more likely to cause the fluorescence quenching of trypsin than that of pepsin. Compared with pepsin, trypsin has a greater ability to bind with I2. The synchronous fluorescence spectral results indicated that I2 induced the quaternary structure changes of trypsin/pepsin and changed the hydrophobicity of Tyr and Trp residues. In addition, molecular docking was used to obtain the binding mode and the various amino acid residues of trypsin and pepsin with I2. These investigations may constitute a solid work to further explain the process of migration and transformation of I2 in digestive system.
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Affiliation(s)
- Yanqing Wang
- Institute of Environmental Toxicology and Environmental Ecology, Yancheng Teachers University, Yancheng City, Jiangsu Province 224051, People's Republic of China; School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng City, Jiangsu Province 224002, People's Republic of China.
| | - Qianqian Han
- School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng City, Jiangsu Province 224002, People's Republic of China; Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing City, Jiangsu Province 210009, People's Republic of China
| | - Gencheng Zhang
- School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng City, Jiangsu Province 224002, People's Republic of China
| | - Hongmei Zhang
- Institute of Environmental Toxicology and Environmental Ecology, Yancheng Teachers University, Yancheng City, Jiangsu Province 224051, People's Republic of China; School of Chemical and Environmental Engineering, Yancheng Teachers University, Yancheng City, Jiangsu Province 224002, People's Republic of China.
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69
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El-Shamy H, Shaban SY, El-Mehasseb I, El-Kemary M, van Eldik R. Probing the interaction of iron complex containing N 3S 2 macrocyclic ligand with bovine serum albumin using spectroscopic techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 228:117811. [PMID: 31813731 DOI: 10.1016/j.saa.2019.117811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 11/16/2019] [Accepted: 11/17/2019] [Indexed: 06/10/2023]
Abstract
The interaction of bovine serum albumin (BSA) with seven-coordination iron (II) complex containing sulfur-based macrocyclic ligand was investigated by means of UV/vis absorption spectroscopy and fluorescence quenching technique. The accurate fluorescence spectra are obtained by using Inner filter effect (IFE) correction. The apparent association constant, kapp, the number of binding sites, n, and the apparent binding constant KSV were found to be 0.95 × 103 M-1, 0.96, and 6.13 × 104 M-1, respectively. It found that BSA molecules are adsorbed on the surface of iron (II) complex by electrostatic interaction. The quenching mechanism is discussed involving energy transfer from BSA to iron (II) complex.
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Affiliation(s)
- Hany El-Shamy
- Chemistry Department, El Shaheed Ezzat El Shafei Secondary School for Girls, Kafrelsheikh, Egypt.
| | - Shaban Y Shaban
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Ibrahim El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Maged El-Kemary
- Chemistry Department, Nano Science and Technology Institute, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt
| | - Rudi van Eldik
- Department of Chemistry and Pharmacy, University of Erlangen-Nuremberg, Egerlandstr. 1, 91058 Erlangen, Germany
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70
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Wang R, Li N, Hu X, Pan J, Zhang G, Zeng X, Gong D. Characterizing the binding of tert-butylhydroquinone and its oxidation product tert-butylquinone with calf thymus DNA in vitro. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112338] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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71
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Zhao L, Zhao X, Ma Y, Zhang Y, Wang D. DNA Binding Characteristics and Protective Effects of Yellow Pigment from Freshly Cut Yam ( Dioscorea opposita). Molecules 2020; 25:E175. [PMID: 31906260 PMCID: PMC6983081 DOI: 10.3390/molecules25010175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/05/2019] [Accepted: 12/09/2019] [Indexed: 02/07/2023] Open
Abstract
Yam yellow pigments (YP) are natural pigments formed during the storage of freshly cut yam (Dioscorea opposita) under certain conditions. The interaction of YP with calf thymus DNA (ctDNA) and its protective effect against DNA oxidative damage were investigated using multiple spectroscopic techniques, competitive binding experiments, viscosity measurements, and gel electrophoresis. Results showed that YP participated in intercalative binding with ctDNA. YP exhibited a protective effect against hydroxyl-induced DNA damage, which was attributed to the high hydroxyl radical scavenging activity of YP. Our findings improve our understanding of the mechanism of interaction between YP and ctDNA, and provide a theoretical basis for the application of YP in the food and drug industry.
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Affiliation(s)
- Lei Zhao
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing Key Laboratory of Agricultural Products of Fruits and Vegetables Preservation and Processing, Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and rural affairs, Beijing 100097, China; (L.Z.); (Y.M.)
- College of Food Science, Shenyang Agricultural University, Shenyang 110866, China
| | - Xiaoyan Zhao
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing Key Laboratory of Agricultural Products of Fruits and Vegetables Preservation and Processing, Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and rural affairs, Beijing 100097, China; (L.Z.); (Y.M.)
| | - Yue Ma
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing Key Laboratory of Agricultural Products of Fruits and Vegetables Preservation and Processing, Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and rural affairs, Beijing 100097, China; (L.Z.); (Y.M.)
| | - Yan Zhang
- Longda Food Group Company Limited, Shandong, Jinan 265231, China
| | - Dan Wang
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Science, Beijing Key Laboratory of Agricultural Products of Fruits and Vegetables Preservation and Processing, Key Laboratory of Vegetable Postharvest Processing, Ministry of Agriculture and rural affairs, Beijing 100097, China; (L.Z.); (Y.M.)
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72
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Shivakumara N, Murali Krishna P. Synthesis, spectral characterization and DNA interactions of 5-(4-substituted phenyl)-1,3,4-thiadiazol-2-amine scaffolds. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.126999] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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73
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Khan S, Zafar A, Naseem I. Probing the interaction of a coumarin-di(2-picolyl)amine hybrid drug-like molecular entity with human serum albumin: Multiple spectroscopic and molecular modeling techniques. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117330. [PMID: 31280128 DOI: 10.1016/j.saa.2019.117330] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 06/26/2019] [Accepted: 06/28/2019] [Indexed: 06/09/2023]
Abstract
HSA is an important plasma protein responsible for transport of drug molecules. Coumarin derivatives play critical role as anticancer, antidiabetic and antiparkinson agents. In our lab we have synthesized coumarin-based pharmacophore, di(2-picolyl)amine-3(bromoacetyl) coumarin (ligand-L) endowed with anticancer activity. Anticancer agents binding mode of HSA provides valuable pharmacological information and is a structural guidance in synthesizing new drugs with greater efficacy. Thus, binding mechanism of ligand-L with HSA was explored using spectroscopic and molecular docking techniques. UV-Vis spectroscopy demonstrates hyperchromism in the absorbance spectra of HSA on addition of ligand-L suggesting interaction of ligand-L with HSA. Fluorescence spectroscopy indicates quenching in the fluorescence of HSA in the presence of ligand-L confirming the complex formation and this binding follows static mechanism. Steady state fluorescence spectroscopy revealed high binding affinity between ligand-L and HSA with a 1:1 stoichiometry. Thermodynamic parameters obtained by ITC suggest that the interaction between ligand-L and HSA is mainly driven by van der Waals forces and hydrogen bonds, and the negative value of ΔG is an indication of spontaneous binding process. Competitive binding and molecular docking experiments showed that the binding site of ligand-L mainly resides in sub-domain IIA of HSA. CD experiments revealed no significant conformational changes in the secondary structure of HSA on binding of ligand-L. We also found that esterase-like activity of HSA was not affected by ligand-L. In conclusion, this study demonstrates binding mechanism of ligand-L with HSA, and the binding did not induce conformational changes in HSA. This study is likely to provide better understanding of transport and delivery of ligand-L via HSA. Overall, it will provide insights into pharmacokinetic properties of ligand-L and designing new ligand-L based derivatives with greater efficacy.
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Affiliation(s)
- Saman Khan
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, Uttar Pradesh, India
| | - Atif Zafar
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, Uttar Pradesh, India
| | - Imrana Naseem
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, Uttar Pradesh, India.
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74
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Molecular interaction of manganese based carbon monoxide releasing molecule (MnCORM) with human serum albumin (HSA). Bioorg Chem 2019; 92:103078. [DOI: 10.1016/j.bioorg.2019.103078] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Revised: 06/12/2019] [Accepted: 06/17/2019] [Indexed: 12/25/2022]
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75
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Insights into the binding mechanism of a model protein with fomesafen: Spectroscopic studies, thermodynamics and molecular modeling exploration. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.05.128] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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76
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Rohman MA, Baruah P, Bhatta A, Mitra S. Deciphering the interactions of substituted chromones possessing acetylcholinesterase inhibition activity in human serum albumin matrix. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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77
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Syed MM, Doshi PJ, Dhavale DD, Doshi JB, Kate SL, Kulkarni G, Sharma N, Uppuladinne M, Sonavane U, Joshi R, Kulkarni MV. Potential of isoquercitrin as antisickling agent: a multi-spectroscopic, thermophoresis and molecular modeling approach. J Biomol Struct Dyn 2019; 38:2717-2736. [PMID: 31315526 DOI: 10.1080/07391102.2019.1645735] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Sickle cell disease is an inherited disease caused by point mutation in hemoglobin (β-globin gene). Under oxygen saturation, sickle hemoglobin form polymers, leading to rigid erythrocytes. The transition of the blood vessels is altered and initiated by the adhesion of erythrocytes, neutrophils and endothelial cells. Sickle Hemoglobin (HbS) polymerization is a major cause in red blood cells (RBC), promoting sickling and destruction of RBCs. Isoquercitrin, a medicinal bioactive compound found in various medicinal plants, has multiple health benefits. The present study examines the potential of isoquercitrin as an anti-sickle agent, showing a significant decrease in the rate of polymerization as well as sickling of RBCs. Isoquercitrin-induced graded alteration in absorbance and fluorescence of HbS, confirmed their interaction. A negative value of ΔG° strongly suggests that it is a spontaneous exothermic reaction induced by entropy. Negative ΔH° and positive ΔS° predicted that hydrogen and hydrophobic binding forces interfered with a hydrophobic microenvironment of β6Val leading to polymerization inhibition of HbS. HbS-Isoquercitrin complex exhibits helical structural changes leading to destabilization of the HbS polymer as confirmed by CD spectroscopy. MST and DSC results indicate greater changes in thermophoretic mobility and thermal stability of sickle hemoglobin in the presence of isoquercitrin, respectively. These findings were also supported by molecular simulation studies using DOCK6 and GROMACS. Hence, we can conclude that isoquercitrin interacts with HbS through hydrogen bonding, which leads to polymerization inhibition. Consequently, isoquercitrin could potentially be used as a medication for the treatment of sickle cell disease.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Muntjeeb M Syed
- Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune, India
| | - Pooja J Doshi
- Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune, India
| | - Dilip D Dhavale
- Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune, India
| | | | - Sudam L Kate
- College of Ayurveda and Research Centre Hadapsar, Maharashtra Arogya Mandal's Sumatibhai Shah Ayurved Mahavidyalaya, Pune, India
| | - Girish Kulkarni
- College of Ayurveda and Research Centre Hadapsar, Maharashtra Arogya Mandal's Sumatibhai Shah Ayurved Mahavidyalaya, Pune, India
| | - Neeru Sharma
- HPC Medical and Bioinformatics Applications Group, Centre for Development of Advanced Computing, Savitribai Phule Pune University Campus, Pune, India
| | - Mallikarjunachari Uppuladinne
- HPC Medical and Bioinformatics Applications Group, Centre for Development of Advanced Computing, Savitribai Phule Pune University Campus, Pune, India
| | - Uddhavesh Sonavane
- HPC Medical and Bioinformatics Applications Group, Centre for Development of Advanced Computing, Savitribai Phule Pune University Campus, Pune, India
| | - Rajendra Joshi
- HPC Medical and Bioinformatics Applications Group, Centre for Development of Advanced Computing, Savitribai Phule Pune University Campus, Pune, India
| | - Mohan V Kulkarni
- Department of Chemistry, Savitribai Phule Pune University (Formerly University of Pune), Pune, India
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78
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Ceylan H, Demir Y, Beydemir Ş. Inhibitory Effects of Usnic and Carnosic Acid on Some Metabolic Enzymes: An In vitro Study. Protein Pept Lett 2019; 26:364-370. [DOI: 10.2174/0929866526666190301115122] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 02/07/2019] [Accepted: 02/09/2019] [Indexed: 11/22/2022]
Abstract
Background:
Natural products are produced via primary and secondary metabolism in
different organisms. The compounds obtained via secondary metabolism are not essential for the
survival of the organism, but they can have a different value for humans.
Objective:
The objective of this study was to examine inhibitory effects of Usnic Acid (UA), a
well-known lichen secondary metabolite, and Carnosic Acid (CA), the primary antioxidant
compound of Rosmarinus officinalis L., on purified Human Paraoxonase, (PON1), Glutathione
Reductase (GR) and Glutathione S-Transferase (GST). These enzymes have antioxidant properties
and a protective effect on the oxidation of free radicals. Hence, deficiencies of such enzymes inside
cells can result in a buildup of toxic substances and cause some metabolic disorders.
Methods:
UA and CA were tested in various concentrations against human GST, PON1, and GR
activity in vitro and they reduced human GST, PON1, and GR activity.
Results:
UA Ki constants were calculated as 0.012±0.0019, 0.107±0.06 and 0.21±0.1 mM for GST,
PON1, and GR enzymes. CA Ki constants were determined as 0.028±0.009, 0.094±0.03 and
0.79±0.33 mM, for GST, PON1, and GR enzymes. UA and CA showed competitive inhibition for
GR and GST enzymes, while they exhibited non-competitive inhibition for PON1.
Conclusion:
These findings indicate that UA and CA could be useful in drug development studies.
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Affiliation(s)
- Hamid Ceylan
- Department of Molecular Biology and Genetics, Faculty of Science, Ataturk University, Erzurum, Turkey
| | - Yeliz Demir
- Department of Chemistry, Faculty of Science, Ataturk University, Erzurum, Turkey
| | - Şükrü Beydemir
- Department of Biochemistry, Faculty of Pharmacy, Anadolu University, Eskisehir, Turkey
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79
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Qian M, Zhang L, Wang J, Peng X. A red-emitting fluorescent probe with large Stokes shift for real-time tracking of cysteine over glutathione and homocysteine in living cells. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 214:469-475. [PMID: 30818148 DOI: 10.1016/j.saa.2019.02.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Revised: 01/16/2019] [Accepted: 02/16/2019] [Indexed: 06/09/2023]
Abstract
Fluorescent probes with high quality for highly selective detection of cysteine (Cys) are still urgently in demand because of the indispensable roles Cys plays in the biological systems. Herein, a red-emitting fluorescent probe CP was developed for the highly selective detection of Cys over glutathione (GSH) and homocysteine (Hcy) by incorporating acryloyl group as the recognition unit into the 2-(2-(4-hydroxystyryl)-6-methyl-4H-pyran-4-ylidene) malononitrile (P-OH) fluorophore which is characterized by red emission, noteworthy Stokes shift, and appreciable photostability. Basically, CP demonstrated appreciable sensing performance toward Cys including short response time of 4 min, high sensitivity with approximately 147-fold emission enhancement, low detection limit of 41.696 nM, and good selectivity both in the solution and living cells, indicating its promising potential of visualizing Cys in biological systems.
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Affiliation(s)
- Ming Qian
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116024 Dalian, Liaoning, PR China; School of Life Science and Biotechnology, Dalian University of Technology, 116024 Dalian, Liaoning, PR China
| | - Liuwei Zhang
- School of Life Science and Biotechnology, Dalian University of Technology, 116024 Dalian, Liaoning, PR China
| | - Jingyun Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116024 Dalian, Liaoning, PR China; School of Life Science and Biotechnology, Dalian University of Technology, 116024 Dalian, Liaoning, PR China.
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116024 Dalian, Liaoning, PR China
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80
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Wang R, Hu X, Pan J, Zhang G, Gong D. Interaction of isoeugenol with calf thymus DNA and its protective effect on DNA oxidative damage. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.03.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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81
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Cytarska J, Anisiewicz A, Baranowska-Łączkowska A, Sikora A, Wietrzyk J, Misiura K, Łączkowski KZ. Triazene salts: Design, synthesis, ctDNA interaction, lipophilicity determination, DFT calculation, and antiproliferative activity against human cancer cell lines. Saudi Pharm J 2019; 27:303-311. [PMID: 30976172 PMCID: PMC6438848 DOI: 10.1016/j.jsps.2018.11.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 11/22/2018] [Indexed: 11/26/2022] Open
Abstract
Synthesis, characterization and investigation of antiproliferative activity of nine triazene salts against human cancer cells lines (MV-4-11, MCF-7, JURKAT, HT-29, Hep-G2, HeLa, Du-145 and DAUDI), and normal human mammary epithelial cell line (MCF7-10A) is presented. The structures of novel compounds were determined using 1H and 13C NMR, and GC-APCI-MS analyses. Among the derivatives, compound 2c, 2d, 2e and 2f has very strong activity against biphenotypic B myelomonocytic leukemia MV4-11, with IC50 values from 5.42 to 7.69 µg/ml. The cytotoxic activity of compounds 2c-2f against normal human mammary gland epithelial cells MCF-10A is 6–11 times lower than against cancer cell lines. Our results also show that compounds 2c and 2f have very strong activity against DAUDI and HT-29 with IC50 4.91 µg/ml and 5.59 µg/ml, respectively. Their lipophilicity was determined using reversed-phase ultra-performance liquid chromatography and correlated with antiproliferative activity. Our UV–Vis spectroscopic results indicate also that triazene salts tends to interact with negatively charged DNA phosphate chain. To support the experiment, theoretical calculations of the 1H NMR shifts were carried out within the Density Functional Theory.
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Affiliation(s)
- Joanna Cytarska
- Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland
| | - Artur Anisiewicz
- Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12, 53-114 Wrocław, Poland
| | | | - Adam Sikora
- Department of Analytical Chemistry, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland
| | - Joanna Wietrzyk
- Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Rudolfa Weigla 12, 53-114 Wrocław, Poland
| | - Konrad Misiura
- Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland
| | - Krzysztof Z Łączkowski
- Department of Chemical Technology and Pharmaceuticals, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Jurasza 2, 85-089 Bydgoszcz, Poland
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82
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Kongot M, Reddy D, Singh V, Patel R, Singhal NK, Kumar A. Potent drug candidature of an ONS donor tethered copper (II) complex: Anticancer activity, cytotoxicity and spectroscopically approached BSA binding studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 212:330-342. [PMID: 30669096 DOI: 10.1016/j.saa.2019.01.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 01/11/2019] [Accepted: 01/13/2019] [Indexed: 06/09/2023]
Abstract
In our continued efforts to develop metal based therapeutic agents, we have synthesized a novel copper(II) complex, [{Cu(hpdbal-sbdt)}2] (2) tethered with a biocompatible ONS2- donor backbone [H2hpdbal-sbdt] (1) [H2hpdbal-sbdt is a tridentate ligand derived from S-benzyldithiocarbazate (Hsbdt) and 2-hydroxy-5-(phenyldiazenyl)benzaldehyde (Hhpdbal)]. The metal complex (2) was characterized using attenuated total reflection-infrared (ATR-IR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, thermogravimetry and differential scanning calorimetric (TG-DSC) analysis, field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS) and elemental (CHNS) analysis. The antineoplastic ability of copper complex was evaluated in vitro against human cervical cancer (HeLa) cells. MTT assay results showed that the copper complex exhibited significant growth inhibition of HeLa cells with an IC50 value of 4.46 μM and this value was compared with reported standards. Cytotoxicity of the copper complex towards human embryonic kidney cells (HEK-293) was also evaluated. The potentially active copper complex was studied for its solution state stability at a pH range of 3-9. Following this, the interactive behaviour of the bioactive copper complex with a drug transporter protein (BSA) was deciphered through multi-spectrosopic investigations like steady-state fluorescence, three-dimensional fluorescence, deconvoluted-IR and UV-Visible techniques.
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Affiliation(s)
- Manasa Kongot
- Centre for Nano and Material Sciences, JAIN (Deemed-to-be University), Jain Global Campus, Bengaluru, 562112, Karnataka, India
| | - Dinesh Reddy
- Centre for Nano and Material Sciences, JAIN (Deemed-to-be University), Jain Global Campus, Bengaluru, 562112, Karnataka, India
| | - Vishal Singh
- National Agri Food Biotechnology Institute, Mohali 140306, India
| | - Rajan Patel
- Biophysical Chemistry Laboratory, Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia (A Central University), New Delhi 110025, India
| | | | - Amit Kumar
- Centre for Nano and Material Sciences, JAIN (Deemed-to-be University), Jain Global Campus, Bengaluru, 562112, Karnataka, India.
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83
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Zhou Z, Hu X, Zhang G, Wang R, Gong D. Exploring the binding interaction of Maillard reaction by-product 5-hydroxymethyl-2-furaldehyde with calf thymus DNA. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2019; 99:3192-3202. [PMID: 30548611 DOI: 10.1002/jsfa.9536] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 10/29/2018] [Accepted: 12/10/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND 5-Hydroxymethyl-2-furaldehyde (5-HMF), a by-product of the Maillard reaction, usually present in fried and baked food, may cause potential harm to the human body. Here, the interaction between 5-HMF and calf thymus DNA (ctDNA) under physiological buffer (pH 7.4) was studied using multi-spectroscopic methods combined with multivariate curve resolution-alternating least squares (MCR-ALS) chemometrics and molecular simulation techniques. RESULTS The concentration profiles and pure spectra of the three components (5-HMF, ctDNA and 5-HMF-ctDNA complex) were extracted from highly overlapping spectra using MCR-ALS analysis, which verified the formation of 5-HMF-ctDNA complex. The binding constant being of the order of 103 L mol-1 at four temperatures (292, 298, 304 and 310 K) indicated a weak affinity in the binding of 5-HMF to ctDNA. The binding interaction was mainly driven by hydrogen bonds and van der Waals forces. Viscosity analysis, melting assay, ionic strength effect and competitive fluorescence studies ascertained that 5-HMF bound to ctDNA through groove binding, and it tended to bind to guanine-cytosine rich region of ctDNA which was characterized using Fourier transform infrared spectra and molecular docking. Circular dichroism spectral analysis and DNA cleavage assays indicated that the ctDNA conformation was altered from B to A form and 5-HMF caused DNA damage at higher concentration. CONCLUSIONS The results suggested that 5-HMF bound to ctDNA through groove binding and caused DNA damage. This research may contribute to understand the binding mechanism of 5-HMF to ctDNA and to the assessment of the toxicological effect of 5-HMF in biological processes. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Zhisheng Zhou
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Xing Hu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Rui Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
| | - Deming Gong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China
- Department of Biomedicine, New Zealand Institute of Natural Medicine Research, Auckland, New Zealand
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84
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Roudini L, NayebZadeh Eidgahi N, Rahimi HR, Saberi MR, Amiri Tehranizadeh Z, Beigoli S, Chamani J. Determining the interaction behavior of calf thymus DNA with berberine hydrochloride in the presence of linker histone: a biophysical study. J Biomol Struct Dyn 2019; 38:364-381. [DOI: 10.1080/07391102.2019.1574240] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Louisa Roudini
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Negar NayebZadeh Eidgahi
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Hamid Reza Rahimi
- Neurogenic Inflammation Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Modern Sciences & Technologies, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Reza Saberi
- Medical Chemistry Department, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Zeinab Amiri Tehranizadeh
- Medical Chemistry Department, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Sima Beigoli
- Endoscopic and Minimally Invasive Surgery Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Jamshidkhan Chamani
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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Gaur R, Usman M. A combined experimental and theoretical investigation of ruthenium(II)-hydrazone complex with DNA: Spectroscopic, nuclease activity, topoisomerase inhibition and molecular docking. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 209:100-108. [PMID: 30384015 DOI: 10.1016/j.saa.2018.10.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 10/18/2018] [Accepted: 10/21/2018] [Indexed: 06/08/2023]
Abstract
A new Dichlorotetra(4-hydroxy-N'-(pyridin-4-ylmethylene)benzohydrazone)Ru(II) complex 1 has been synthesized and characterized using spectroscopic techniques. The structure of complex 1 has been optimized through ORCA computational programme package using B3LYP functionals. The complex binds efficiently with calf thymus DNA (CT-DNA) as monitored by UV-visible titrations (Kb = 4.8 × 105), ethidium bromide displacement studies (Ksv = 1.39) as well as Circular Dichroism (CD) titrations. The complex intercalates with DNA base pairs. It shows cleavage of supercoiled (SC) DNA into nicked circular (NC) DNA efficiently via oxidative pathway. Complex 1 also inhibits Topoisomerase I (Topo I) relaxation activity at concentration < 20 μM. The molecular docking studies support that Topo I inhibition occur via blocking religation of G11 hydroxyl group.
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Affiliation(s)
- Ruchi Gaur
- Department of Chemistry, IIT, Kanpur 208016, India.
| | - Mohammad Usman
- Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
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