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Efficient binding paradigm of protein and polysaccharide: Preparation of isolated soy protein-chitosan quaternary ammonium salt complex system and exploration of its emulsification potential. Food Chem 2023; 407:135111. [PMID: 36527948 DOI: 10.1016/j.foodchem.2022.135111] [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: 06/08/2022] [Revised: 11/22/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022]
Abstract
Soy protein isolate (SPI) has good emulsifying ability, but is greatly affected by the environment. The addition of polysaccharides either increases or decreases the stability of SPI. We report and prepared for the first time SPI/HACC complexes with different polysaccharide contents (SPI/HACC ratios are 1:1, 2:1 and 5:1). The binding properties, microstructure and emulsifying properties of the SPI/HACC complexes were determined and analyzed. The results showed that the interaction them is mainly through hydrogen bonding, electrostatic interaction, hydrophobic interaction and steric hindrance effect. The combination of SPI and HACC overcomes their respective limitations and the microstructure is more flat and smooth. It was also found that the emulsifying ability and concentration of SPI showed a certain correlation and the addition of HACC significantly improved the emulsifying ability and storage stability of SPI. This study shows that the prepared SPI/HACC complex has great potential for application in the food industry.
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2
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A Novel Fluorescent Probe for the Detection of Cyanide Ions in Solutions and Studies on Its Biophysical Interactions with ctDNA and Proteases. J Fluoresc 2022; 32:2173-2188. [PMID: 35972711 DOI: 10.1007/s10895-022-03014-0] [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: 07/01/2022] [Accepted: 08/04/2022] [Indexed: 10/15/2022]
Abstract
A new cationic indolium based styryl dye (Ci) as a fluorescent probe was synthesized and its anions selectivity/sensitivity properties/molecular interactions with protease enzymes (pepsin/trypsin) and ctDNA has been studied by spectroscopic and computational methods. The fluorescence measurements at different temperatures indicated that quenching mechanism of enzymes by Ci was static. ΔH and ΔS data pointed out electrostatic/hydrophobic interactions with pepsin, and also hydrogen bonds/van der Waals forces with trypsin of Ci. According to Förster's non-radiative energy transfer, binding distances (r) were calculated as 3.53/3.27 nm for pepsin/trypsin. It was also investigated that groove binding is effective in interaction with ctDNA. The results were supported with molecular docking analyzes which have same tendency. Ci has been demonstrated hypsochromic effect with a decrease in polarity of solvents and it showed highly selective colorimetric and fluorometric sensing behavior for cyanide in organic solvent and in aqueous solution. 1H NMR titration was performed to examine the interaction mechanism between Ci and cyanide. The LOD values of cyanide ion were reported as 4.87 × 10-9 M and 9.70 × 10-7 M in DMSO and DMSO/H2O binary mixture, respectively. In addition, sensitivity of Ci as a chemosensor to cyanide was investigated in bitter almond samples.
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3
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Sadat Mostafavi E, Asoodeh A, Chamani J. Evaluation of interaction between Ponceau 4R (P4R) and trypsin using kinetic, spectroscopic, and molecular dynamics simulation methods. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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4
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Xu M, Cui Z, Xiao Y, Liu C, Liu R, Zong W. Probing the potential toxicity by characterizing the binding mechanism of sodium dehydroacetate to human serum albumin. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:3655-3664. [PMID: 34882798 DOI: 10.1002/jsfa.11712] [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: 07/28/2021] [Revised: 11/03/2021] [Accepted: 12/09/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Sodium dehydroacetate (DHA-S) is a common food additive, which can combine with serum proteins in the plasma, but the interaction mechanism between DHA-S and human serum albumin (HSA) is unclear. In this study, multiple spectroscopy techniques, isothermal titration calorimetry (ITC), molecular docking and esterase activity test were employed to investigate the interaction mechanism of DHA-S and HSA. RESULTS A DHA-S-HSA complex was formed and the structure of HSA were altered by DHA-S. Since DHA-S changed the tight structure of the hydrophobic subdomain IIA where tryptophan (Trp) was placed, the hydrophobicity of the microenvironment of HSA was enhanced. With the addition of DHA-S, the skeleton structure of HSA became loose and the solvent shell on the HSA surface was destroyed. DHA-S altered the secondary structure of HSA, resulting in the decreased α-helix and increased β-sheet contents. The interaction was exothermic and spontaneous driven by van der Waals and hydrogen bonding. DHA-S inhibited the esterase activity of HSA. Molecular docking demonstrated that the binding site of DHA-S on HSA located at the cavity of subdomains IIA and IIIA, but the amino acids related to esterase activity of HSA were not in the binding pocket, indicating that the mechanism by which DHA-S inhibited HSA esterase activity was the change in protein structure. CONCLUSION This study illustrated that DHA-S interacted with HSA and the structure and function of HSA were affected by DHA-S. This research could help to understand the toxicity of DHA-S and provide basic data for safe use of food additives. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Mengchen Xu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Zhaohao Cui
- Qingdao Research Academy of Environmental Sciences, Qingdao, P. R. China
| | - Yihua Xiao
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Changqing Liu
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, P. R. China
| | - Rutao Liu
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, Qingdao, P. R. China
| | - Wansong Zong
- College of Population, Resources and Environment, Shandong Normal University, Jinan, P. R. China
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Qi X, Xu D, Zhu J, Wang S, Peng J, Gao W, Cao Y. Studying the interaction mechanism between bovine serum albumin and lutein dipalmitate: Multi-spectroscopic and molecular docking techniques. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106513] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Sun N, Li M, Liu G, Jing M, He F, Cao Z, Zong W, Tang J, Gao C, Liu R. Toxic mechanism of pyrene to catalase and protective effects of vitamin C: Studies at the molecular and cell levels. Int J Biol Macromol 2021; 171:225-233. [PMID: 33418042 DOI: 10.1016/j.ijbiomac.2020.12.169] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/10/2020] [Accepted: 12/22/2020] [Indexed: 11/17/2022]
Abstract
Polycyclic aromatic hydrocarbons, distributing extensively in the soil, would potentially threaten the soil organisms (Eisenia fetida) by triggering oxidative stress. As a ubiquitous antioxidant enzyme, catalase can protect organisms from oxidative damage. To reveal the potential impact of polycyclic aromatic hydrocarbon pyrene (Pyr) on catalase (CAT) and the possible protective effect of Ascorbic acid (vitamin C), multi-spectral and molecular docking techniques were used to investigate the influence of structure and function of catalase by pyrene. Fluorescence and circular dichroism analysis showed that pyrene would induce the microenvironmental changes of CAT amino acid residues and increase the α-helix in the secondary structure. Molecular simulation results indicated that the main binding force of pyrene around the active center of CAT is hydrogen bonding force. Furthermore, pyrene inhibited catalase activity to 69.9% compared with the blank group, but the degree of inhibition was significantly weakened after vitamin C added into the research group. Cell level experiments showed that pyrene can increase the level of ROS in the body cavity cell of earthworms, and put the cells under the threat of potential oxidative damage. Antioxidants-vitamin C has a protective effect on catalase and maintains the stability of intracellular ROS levels to a certain extent.
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Affiliation(s)
- Ning Sun
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Meifei Li
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Guiliang Liu
- Shandong Institute for Food and Drug Control, Jinan 250101, PR China
| | - Mingyang Jing
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Falin He
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Zhaozhen Cao
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Wansong Zong
- College of Geography and Environment, Shandong Normal University, 88# East Wenhua Road, Jinan, Shandong 250014, PR China
| | - Jingchun Tang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, PR China
| | - Canzhu Gao
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China
| | - Rutao Liu
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, 72# Jimo Binhai Road, Qingdao, Shandong 266237, PR China.
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7
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Ren G, Sun H, Li G, Fan J, Du L, Cui G. Interaction mechanism of aloe-emodin with trypsin: molecular structure-affinity relationship and effect on biological activities. RSC Adv 2020; 10:20862-20871. [PMID: 35517743 PMCID: PMC9054315 DOI: 10.1039/d0ra02712j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 05/13/2020] [Indexed: 12/23/2022] Open
Abstract
The molecular mechanism of interaction between aloe-emodin (AE) and trypsin was investigated, exhibiting remarkable outcomes. To detect the interaction mechanism, the binding of AE with trypsin was examined by a multi-spectroscopy and molecular docking method. Results showed that the binding of AE and trypsin would lead to static quenching and their binding forces were van der Waals forces and hydrogen bonding. The results of simultaneous and three-dimensional fluorescence spectroscopy showed that the combination of AE and trypsin caused changes in the microenvironment around the trypsin fluorophore, which might change the spatial structure of trypsin. FT-IR spectroscopy showed that the contents of α-helix and β-turn in trypsin were decreased and the contents of β-sheet, random coil and antiparallel β-sheet were increased. Moreover, all these experimental results were verified and reasonably explained by molecular docking results. We also investigated the enzyme activity of trypsin and the antioxidant activity of AE. The results showed that both the enzyme activity of trypsin and the antioxidant activity of AE were decreased after interaction between AE and trypsin. The findings outlined in this study should elucidate the molecular mechanisms of interaction between AE and trypsin and contribute to making full use of AE in the food industry.
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Affiliation(s)
- Guoyan Ren
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597.,Henan Engineering Research Center of Food Material Luoyang 471023 China.,National Demonstration Center for Experimental Food Processing and Safety Education Luoyang 471023 China
| | - He Sun
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597
| | - Gen Li
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597
| | - Jinling Fan
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597
| | - Lin Du
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597
| | - Guoting Cui
- College of Food and Bioengineering, Henan University of Science and Technology Luoyang 471023 China +86-15937969597
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8
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Liu M, Liu T, Shi Y, Zhao Y, Yan H, Sun B, Wang Q, Wang Z, Han J. Comparative study on the interaction of oxyresveratrol and piceatannol with trypsin and lysozyme: binding ability, activity and stability. Food Funct 2020; 10:8182-8194. [PMID: 31696185 DOI: 10.1039/c9fo01888c] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Natural polyphenols showing a variety of beneficial effects will interact with multiple proteases after administration. The interactions of oxyresveratrol and piceatannol with trypsin and lysozyme were investigated using fluorescence spectroscopy, UV-vis absorption spectroscopy, circular dichroism spectroscopy, differential scanning calorimetry and molecular docking. Fluorescence quenching results and UV-vis absorption difference spectra revealed that the quenching process was a static mode initiated by ground-state complex formation. The different binding ability of oxyresveratrol and piceatannol with trypsin and lysozyme was discussed based on their different molecular structures. Moreover, the major driving force for the binding process was elucidated as hydrogen bonding and van der Waals forces by the negative enthalpy and entropy changes. Synchronous fluorescence, three-dimensional fluorescence and circular dichroism spectral analysis suggested that the binding of oxyresveratrol and piceatannol to trypsin and lysozyme induced some microenvironmental and conformational changes of the two enzymes. The thermal stability of the enzymes in the presence of polyphenols was studied based on the change in melting temperature by differential scanning calorimetry. The above experimental results were validated by the protein-ligand docking studies which showed the location of the two ligands in the enzymes and the surrounding amino acid residues. Furthermore, enzyme activity assays indicated that the enzymatic activity of trypsin and lysozyme was inhibited by oxyresveratrol and piceatannol. The effect of trypsin and lysozyme on the antioxidant activity and stability of oxyresveratrol and piceatannol was also investigated. In conclusion, the comparative study on the interaction of oxyresveratrol and piceatannol with trypsin and lysozyme showed that the positions of hydroxyl groups of the polyphenols had an important influence on their interaction with enzymes and their antioxidant activity and stability as well as the enzyme activities. The obtained results are expected to provide a theoretical basis for the application of polyphenols in functional foods and pharmaceuticals.
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Affiliation(s)
- Min Liu
- Institute of BioPharmceutical Research, Liaocheng University, Liaocheng 252059, China.
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9
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Jesna KK, Ilanchelian M. Gold nanorods–trypsin biocorona: a novel nano composite for in vitro cytotoxic activity towards MCF-7 and A-549 cancer cells. NEW J CHEM 2020. [DOI: 10.1039/d0nj03299a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
In the present work, we have synthesized cetyltrimethyl ammonium bromide (CTAB) capped gold nanorods (Au NRs) to evaluate apparent binding affinities for the adsorption of trypsin (TRP).
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10
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Molecular docking and muiltple spectroscopy investigation on the binding characteristics of aloe-emodin to pepsin. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.05.084] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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11
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Wang D, Qiu S, Wang M, Pan S, Ma H, Zou J. Spectrophotometric determination of hydrogen peroxide in water by oxidative decolorization of azo dyes using Fenton system. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 221:117138. [PMID: 31158762 DOI: 10.1016/j.saa.2019.117138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 05/13/2019] [Accepted: 05/15/2019] [Indexed: 06/09/2023]
Abstract
In this study, based on the oxidative decolorization of three azo dyes (Orange G (OG), Acid Orange 7 (AO7) and Reactive Black 5 (RB5)) with hydroxyl radicals generated in Fenton system, we have successfully established three types of azo dyes spectrophotometric methods for measuring aqueous hydrogen peroxide (H2O2) concentration. The decolorization extent of OG, AO7 and RB5 at the corresponding characteristic wavelengths of 478 nm, 484 nm and 597 nm are proportion to the concentration of H2O2 in aqueous solutions. Under the selected reaction conditions, three well linear correlations between the depletion of azo dyes and the H2O2 concentration are established in the range of 0.45-175 μmol L-1 of OG, 0.36-120 μmol L-1 of AO7 and 0.44-175 μmol L-1 of RB5, respectively. These proposed spectrophotometric methods are enough accurate to measure low concentrations of H2O2 in practical water samples and monitor the variations of H2O2 concentration during the phenol degradation in the Cu(II)/HCO3-/H2O2 process.
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Affiliation(s)
- Daiyao Wang
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China
| | - Shiyi Qiu
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China
| | - Mengyun Wang
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China
| | - Siwen Pan
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China
| | - Hongfang Ma
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China
| | - Jing Zou
- Institute of Municipal and Environmental Engineering, College of Civil Engineering, Huaqiao University, Xiamen, Fujian 361021, PR China.
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12
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Ren G, Sun H, Guo J, Fan J, Li G, Xu S. Molecular mechanism of the interaction between resveratrol and trypsin via spectroscopy and molecular docking. Food Funct 2019; 10:3291-3302. [DOI: 10.1039/c9fo00183b] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Mechanism of the interaction between resveratrol and trypsin and its effect on their biological activity.
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Affiliation(s)
- Guoyan Ren
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
| | - He Sun
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
| | - Jinying Guo
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
| | - Jinling Fan
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
| | - Gen Li
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
| | - Saiwen Xu
- College of Food and Bioengineering
- Henan University of Science and Technology
- Luoyang 471023
- China
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13
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Qu W, Yuan D, Zhao L, Zong W, Liu R. Exploring the binding interaction between copper ions and Candida rugosa lipase. Toxicol Res (Camb) 2018; 7:1100-1107. [PMID: 30542604 PMCID: PMC6249630 DOI: 10.1039/c8tx00158h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 09/16/2018] [Indexed: 01/20/2023] Open
Abstract
The wide range of applications of copper have caused widespread concern about its toxicity. However, few studies have reported the mechanism of the binding interaction between copper ions and digestive enzymes, which play an important role in physiological health and industrial production. In this study, the effects of copper ions on the conformation and activity of Candida rugosa lipase (CRL) were evaluated by isothermal titration calorimetry (ITC), multiple spectral techniques, molecular simulation and enzyme activity assays. The results showed that copper ions can be combined with lipase, the binding affinity constant (K) was (2.91 ± 0.619) × 10-3 M-1, the binding process was a spontaneous process, and the main force was the hydrophobic force. Rather than increasing the hydrophobicity of the amino acid microenvironment of CRL, the spectral methods demonstrated that copper can also make the protein peptide bond structure compact, changing its secondary structure. In addition, molecular simulation results showed that copper ions opened the "lid" of the CRL and entered the active center, which consequently changed the conformation of the CRL molecule. Structural changes may cause changes in enzyme activity. The increased activity of CRL with the addition of copper ions was verified by enzyme activity assay. In summary, copper showed an effect on CRL at the molecular level, which means its toxicity should receive more attention.
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Affiliation(s)
- Wenjun Qu
- School of Environmental Science and Engineering , Shandong University , China-America CRC for Environment & Health , Shandong Province , 72# Jimo Binhai Road , Qingdao , Shandong 266237 , P.R. China . ; ; Tel: +86-531-88365489
| | - Dong Yuan
- Department of Chemistry and Chemical Engineering , Qilu Normal University , Jinan 250013 , P.R. China
| | - Lining Zhao
- School of Environmental Science and Engineering , Shandong University , China-America CRC for Environment & Health , Shandong Province , 72# Jimo Binhai Road , Qingdao , Shandong 266237 , P.R. China . ; ; Tel: +86-531-88365489
| | - Wansong Zong
- College of Population , Resources and Environment , Shandong Normal University , 88# East Wenhua Road , Jinan 250014 , P. R. China
| | - Rutao Liu
- School of Environmental Science and Engineering , Shandong University , China-America CRC for Environment & Health , Shandong Province , 72# Jimo Binhai Road , Qingdao , Shandong 266237 , P.R. China . ; ; Tel: +86-531-88365489
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14
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Wu Z, Huang F, Chen Y, Xu H, Meti MD, Fan Y, Han QG, Tang H, He Z, Hu Z. Conformation change of trypsin induced by acteoside as studied using multiple spectroscopic and molecular docking methods. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2018. [DOI: 10.1080/10942912.2018.1454944] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Zhibing Wu
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Fengwen Huang
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Yutao Chen
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
- School of Science, Faculty of Health and Environmental Sciences, Auckland University of Technology, Auckland, New Zealand
| | - Hong Xu
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
- Key Laboratory of RF Circuits and Systems of Ministry of Education, Hangzhou Dianzi University, Hangzhou, China
| | - Manjunath D. Meti
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Yu Fan
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Qingguo G. Han
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
| | - Haifeng Tang
- Department of Gynecology and Obstetrics, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China
| | - Zhendan He
- School of Medicine, Shenzhen University, Shenzhen, China
| | - Zhangli Hu
- Shenzhen Key Laboratory of Marine Bioresources and Ecology/Shenzhen Key Laboratory of Microbial Genetic Engineering, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, China
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15
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Xu M, Zhang R, Song W, Zong W, Liu R. Probing the toxic mechanism of bisphenol A with acid phosphatase at the molecular level. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:11431-11439. [PMID: 29423697 DOI: 10.1007/s11356-018-1378-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Accepted: 01/23/2018] [Indexed: 06/08/2023]
Abstract
As an endocrine-disrupting chemical, bisphenol A (BPA), can affect normal endocrine function of hormone. This paper studied the toxic effect of BPA on acid phosphatase at the molecular level by multi-spectroscopic measurements, molecular docking, and enzyme activity experiment. BPA could enhance the fluorescence intensity, change the structure, and cause an increased hydrophobicity of acid phosphatase. Hydrogen bond interaction and van der Waals forces were the main forces to generate the BPA-acid phosphatase complex on account of the negative ΔH (- 36.92 kJ mol-1) and ΔS (- 50.78 J mol-1 K-1). BPA led to the loosening and unfolding of protein structure and extending the peptide strands, as revealed by UV-vis absorption and CD spectra. Based on the enzyme activity experiment, BPA could decrease the activity of the acid phosphatase by entering the active site of the enzyme. The molecular docking model showed that BPA could bind into the cavity of acid phosphatase and interact with Tyr A252 and a hydrogen bond (1.47 Å) was formed in the binding process. This work suggested the structures and functions of acid phosphatase were both affected by BPA.
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Affiliation(s)
- Mengchen Xu
- School of Environmental Science and Engineering, China -America CRC for Environment & Health, Shandong Province, Shandong University, 27# Shanda South Road, Jinan, 250100, People's Republic of China
| | - Rui Zhang
- School of Environmental Science and Engineering, China -America CRC for Environment & Health, Shandong Province, Shandong University, 27# Shanda South Road, Jinan, 250100, People's Republic of China
| | - Wei Song
- School of Environmental Science and Engineering, China -America CRC for Environment & Health, Shandong Province, Shandong University, 27# Shanda South Road, Jinan, 250100, People's Republic of China
| | - Wansong Zong
- College of Population, Resources and Environment, Shandong Normal University, 88# East Wenhua Road, Jinan, 250014, People's Republic of China
| | - Rutao Liu
- School of Environmental Science and Engineering, China -America CRC for Environment & Health, Shandong Province, Shandong University, 27# Shanda South Road, Jinan, 250100, People's Republic of China.
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16
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Li F, Ma Z, Wang S, Li T, Sun C, Li Z, Men Z. Study of the transient "free" OH radical generated in H 2O-H 2O 2 mixtures by stimulated Raman scattering. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 175:246-249. [PMID: 28043068 DOI: 10.1016/j.saa.2016.12.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 12/16/2016] [Accepted: 12/18/2016] [Indexed: 06/06/2023]
Abstract
Forward and backward stimulated Raman scattering (SRS) were studied in the H2O2-H2O mixtures by a strong excitation laser with 532nm. Only the backward SRS (BSRS) of the H2O2-H2O system shows an unexpected SRS shoulder peak at around 3600cm-1, which is similar to the characteristic peak of "free" OH radical. The generation of the "free" OH radical is mainly attributed to the dissociation of hydrogen peroxide (HP) molecules. Simultaneously, the ionization of HP-water clusters generates a part of "free" OH radical under the Laser-induced breakdown (LIB). The interaction of water and HP is also discussed.
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Affiliation(s)
- Fangfang Li
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Zhiwei Ma
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Shenghan Wang
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Tianyu Li
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Chenglin Sun
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China
| | - Zhanlong Li
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
| | - Zhiwei Men
- Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China.
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Verma SK, Ghosh KK, Verma R, Verma S, N. GH, Zhao X. Activity of α-Chymotrypsin in Cationic and Nonionic Micellar Media: Ultraviolet and Fluorescence Spectroscopic Approach. INT J CHEM KINET 2015. [DOI: 10.1002/kin.20972] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Santosh K. Verma
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Kallol K. Ghosh
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Rameshwari Verma
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Shekhar Verma
- Faculty of Pharmaceutical Sciences; Shri Shankaracharya Group of Institutions; Bhilai India
| | - Girish H. N.
- State Key Laboratory of Advance Technology for Material Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
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18
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Li X, Li P. Study on the interaction of β-carotene and astaxanthin with trypsin and pepsin by spectroscopic techniques. LUMINESCENCE 2015; 31:782-92. [DOI: 10.1002/bio.3024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/13/2015] [Accepted: 08/05/2015] [Indexed: 12/26/2022]
Affiliation(s)
- Xiangrong Li
- Department of Chemistry, School of Basic Medicine; Xinxiang Medical University; Xinxiang Henan 453003 People's Republic of China
| | - Peihong Li
- The Clinical Skills Training Center; Xinxiang Medical University; Xinxiang Henan 453003 People's Republic of China
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Liu Y, Zhang G, Liao Y, Wang Y. Binding characteristics of psoralen with trypsin: Insights from spectroscopic and molecular modeling studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 151:498-505. [PMID: 26162336 DOI: 10.1016/j.saa.2015.07.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Revised: 07/01/2015] [Accepted: 07/03/2015] [Indexed: 06/04/2023]
Abstract
Psoralen (PSO) is a naturally occurring furanocoumarin with a variety of pharmacological activities, however very limited information on the interaction of PSO with trypsin is available. In this study, the binding characteristics between PSO and trypsin at physiological pH were investigated using a combination of fluorescence, UV-vis absorption, circular dichroism (CD), Fourier transform infrared (FT-IR) spectroscopic, chemometric and molecular modeling approaches. It was found that the fluorescence quenching of trypsin by PSO was a static quenching procedure, ascribing the formation of a PSO-trypsin complex. The binding of PSO to trypsin was driven mainly by hydrophobic forces as the positive enthalpy change and entropy change values. The molecular docking showed that PSO inserted into the active site pocket of trypsin to interact with the catalytic residues His57, Asp102 and Ser195 and may cause a decrease in trypsin activity. The results of CD and FT-IR spectra along with the temperature-induced denaturation studies indicated that the addition of PSO to trypsin led to the changes in the secondary structure of the enzyme. The concentration profiles and spectra of the three components (PSO, trypsin, and PSO-trypsin complex) obtained by multivariate curve resolution-alternating least squares analysis exhibited the kinetic processes of PSO-trypsin interaction. This study will be helpful to understand the mechanism of PSO that affects the conformation and activity of trypsin in biological processes.
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Affiliation(s)
- Yingying Liu
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China.
| | - Yijing Liao
- College of Pharmacy, Nanchang University, Nanchang 330047, China
| | - Yaping Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China
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