1
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Xu T, Li X, Wu C, Fan G, Li T, Zhou D, Zhu J, Wu Z, Hua X. Improved encapsulation effect and structural properties of whey protein isolate by dielectric barrier discharge cold plasma. Int J Biol Macromol 2024; 257:128556. [PMID: 38061529 DOI: 10.1016/j.ijbiomac.2023.128556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/23/2023] [Accepted: 11/30/2023] [Indexed: 12/22/2023]
Abstract
The whey protein isolate (WPI) was modified by dielectric barrier discharge cold plasma (DBD) in order to improve its encapsulation efficiency of rutin. In this work, the effect of DBD treatment on structure and physicochemical properties of WPI and the interaction between DBD-treated WPI and rutin were investigated. The results showed that the structural change of WPI leaded to the exposure of internal hydrophobic groups, increasing the interaction site with rutin. The encapsulation efficiency of DBD-treated WPI (30 kV, 30 s) on rutin was improved by 12.42 % compared with control group. The results of multispectral analysis showed that static quenching occurred in the process of interaction between DBD-treated and rutin, hydrogen bond and van der Waals force were the main forces between them. Therefore, DBD treatment can be used as a method to improve the encapsulation efficiency of WPI on hydrophobic active substances.
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Affiliation(s)
- Ting Xu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Xiaojing Li
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
| | - Caie Wu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
| | - Gongjian Fan
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
| | - Tingting Li
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
| | - Dandan Zhou
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
| | - Jinpeng Zhu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Zhihao Wu
- College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
| | - Xiaowen Hua
- Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, China
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2
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Insights into the α-amylase and α-glucosidase inhibition mechanism of 4-(4-hydroxyphenyl)-but-3-en-2-one from Scutellaria barbata D. Don: enzymatic kinetics, fluorescence spectroscopy and computational simulation. Med Chem Res 2022. [DOI: 10.1007/s00044-022-02966-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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3
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Li R, Huang L, Zhang Z, Chen J, Tang H. Integrated multispectroscopic analysis and molecular docking analyses of the structure-affinity relationship and mechanism of the interaction of flavonoids with zein. Food Chem 2022; 386:132839. [PMID: 35366631 DOI: 10.1016/j.foodchem.2022.132839] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 03/23/2022] [Accepted: 03/26/2022] [Indexed: 11/04/2022]
Abstract
Zein is a desired carrier to construct a delivery system for flavonoids. However, studies examining the binding of flavonoids with zein are still inadequate. Therefore, the structure-affinity relationship and mechanism underlying the interaction between flavonoids and zein were investigated using multiple spectroscopy techniques and molecular docking. The UV-vis spectra revealed ground-state complex formation. The fluorescence quenching spectra suggested that flavonoids effectively quenched the intrinsic fluorescence of zein mainly through static quenching. The structure-affinity relationship revealed the key structural elements and preferred substituents at specific sites of flavonoids related to binding affinity with zein. The synchronous, ANS-binding fluorescence and FT-IR spectra confirmed that flavonoids induced a conformational change in zein secondary structure. Additionally, molecular docking further provided a favorable binding conformation and underlined the important role of hydrophobic interactions and hydrogen bonds in their interactions. These findings suggest that different flavonoid structures significantly influence binding behaviors with zein.
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Affiliation(s)
- Renjie Li
- College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu 241000, PR China
| | - Lin Huang
- Blood Purification Center, Affiliated Yijishan Hospital of Wannan Medical College, Wuhu 241001, PR China
| | - Zhuangwei Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, PR China
| | - Jin Chen
- College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu 241000, PR China
| | - Hongjin Tang
- College of Biological and Food Engineering, Anhui Polytechnic University, Wuhu 241000, PR China.
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4
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Dlamini BS, Chen CR, Chen YK, Hsu JL, Shih WL, Chang CI. Mechanistic insights into the inhibitory activities of chemical constituents from the fruits of Terminalia boivinii on α-glucosidase. Chem Biodivers 2022; 19:e202200137. [PMID: 35726787 DOI: 10.1002/cbdv.202200137] [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: 02/14/2022] [Accepted: 06/21/2022] [Indexed: 11/09/2022]
Abstract
Regulation of key digestive enzymes is currently considered an effective remedy for diabetes mellitus. In this study, bioactive constituents were purified from Terminalia boivinii fruits and identified by 1 H NMR, 13 C NMR and EI-MS. In vitro and in silico methods were used to evaluate α-glucosidase, α-amylase, and lipase inhibition activities. Compounds 1 , 2 , and 4-7 with IC50 values between 89 and 445 µM showed stronger α-glucosidase inhibitory activities than the antihyperglycemic drug acarbose (IC 50 =1463.0 ± 29.5 µM). However, the compounds showed lower inhibitory effects against α-amylase and lipase with IC 50 values above 500 µM than acarbose (IC 50 = 16.7 ± 3.5 µM) and ursolic acid (IC 50 = 89.5 ± 5.6 µM), respectively. Lineweaver-Burk plots showed that compounds 1 , 2 , and 7 were non-competitive inhibitors, compounds 4 and 5 were competitive inhibitors and compound 6 was a mixed-type inhibitor. Fluorescence spectroscopic data showed that the compounds altered the microenvironment and conformation of α-glucosidase. Computer simulations indicated that the compounds and enzyme interacted primarily through hydrogen bonding. The findings indicated that the compounds were inhibitors of α-glucosidase and provided significant structural basis for understanding the binding activity of the compounds with α-glucosidase.
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Affiliation(s)
- Bongani Sicelo Dlamini
- National Pingtung University of Science and Technology, Department of Tropical Agriculture and International Cooperation, No. 1, Shuefu Road, Neipu Pingtung County 91201, Taiwan, 91201, Pingtung, TAIWAN
| | - Chiy-Rong Chen
- National Taitung University, Department of Life Science, Taitung 95002, Taiwan, Taitung, TAIWAN
| | - Yu-Kuo Chen
- National Pingtung University of Science and Technology, Department of Food Science, Pingtung 91201, Taiwan, Pingtung, TAIWAN
| | - Jue-Liang Hsu
- National Pingtung University of Science and Technology, Department of Biological Science and Technology, Pingtung 91201, Taiwan, Pingtung, TAIWAN
| | - Wen-Ling Shih
- National Pingtung University of Science and Technology, Department of Biological Science and Technology, Pingtung 91201, Taiwan, Pingtung, TAIWAN
| | - Chi-I Chang
- National Pingtung University of Science and Technology, Department of Biological Science and Technology, No.1, Shuehfu Road, Neipu, 91201, Pingtung, TAIWAN
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5
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Khayyat AIA, Zargar S, Wani TA, Rehman MU, Khan AA. Association Mechanism and Conformational Changes in Trypsin on Its Interaction with Atrazine: A Multi- Spectroscopic and Biochemical Study with Computational Approach. Int J Mol Sci 2022; 23:ijms23105636. [PMID: 35628445 PMCID: PMC9146720 DOI: 10.3390/ijms23105636] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/15/2022] [Accepted: 05/16/2022] [Indexed: 02/01/2023] Open
Abstract
Atrazine (ATR) is a herbicide globally used to eliminate undesired weeds. Herbicide usage leads to various adverse effects on human health and the environment. The primary source of herbicides in humans is the food laced with the herbicides. The ATR binding to trypsin (TYP) was investigated in this study to explore its binding potential and toxicity. In vitro interaction of ATR with TYP was studied using multi-spectroscopic methods, molecular docking, and enzyme kinetics to explore the mechanism of binding for the TYP-ATR system. The TYP-ATR complex revealed binding constants (103 M-1), suggesting a moderate binding. The free energy for the TYP-ATR complexes was negative, suggesting a spontaneous interaction. Thermodynamic parameters enthalpy (ΔH) and entropy (ΔS) obtained positive values for the TYP-ATR system suggesting hydrophobic interactions in the binding process. Micro-environmental and conformational changes in TYP molecules were induced on interaction with ATR. Reduced catalytic activity of TYP was observed after interaction with ATR owing to the changes in the secondary structure of the TYP.
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Affiliation(s)
- Arwa Ishaq A. Khayyat
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Seema Zargar
- Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;
- Correspondence: (S.Z.); (T.A.W.)
| | - Tanveer A. Wani
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;
- Correspondence: (S.Z.); (T.A.W.)
| | - Muneeb U. Rehman
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Azmat Ali Khan
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;
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6
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Yang J, Wang X, Zhang C, Ma L, Wei T, Zhao Y, Peng X. Comparative study of inhibition mechanisms of structurally different flavonoid compounds on α-glucosidase and synergistic effect with acarbose. Food Chem 2021; 347:129056. [PMID: 33476922 DOI: 10.1016/j.foodchem.2021.129056] [Citation(s) in RCA: 72] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 12/11/2020] [Accepted: 01/05/2021] [Indexed: 01/14/2023]
Abstract
Flavonoid compounds have anti-diabetic activity, which can control blood glucose levels by inhibiting α-glucosidase activity. In this paper, the inhibition mechanisms between four flavonoid compounds and α-glucosidase were studied by multispectroscopic methods and molecular docking. The results showed that the inhibitory activities of flavonoid compounds were higher than that of acarbose, and the sequence of inhibition effect was scutellarein > nepetin > apigenin > hispidulin > acarbose. Also, the synergistic effects of flavonoid compounds combined with acarbose on inhibiting α-glucosidase activity were observed. The fluorescence results showed that flavonoid compounds combined with α-glucosidase to form a stable complex. And the spectral analysis indicated that the microenvironmental and secondary structure of α-glucosidase were changed. The present study demonstrated that the molecular structure of flavonoid compounds played an important role in the inhibition process, namely, scutellarein with more hydroxyl groups on the A-ring might serve as the most effective α-glucosidase inhibitor.
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Affiliation(s)
- Jichen Yang
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
| | - Xiaoli Wang
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
| | - Chuanying Zhang
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
| | - Lun Ma
- Shaanxi Zhuyuanbang Medical Technology Co., Ltd, Xi'an 710048, PR China
| | - Tao Wei
- Shaanxi Zhuyuanbang Medical Technology Co., Ltd, Xi'an 710048, PR China
| | - Yajing Zhao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Xin Peng
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures, Tianjin University, Tianjin 300072, PR China.
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7
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Hairat S, Zaki M. Half sandwiched RutheniumII complexes: En Route towards the targeted delivery by Human Serum Albumin (HSA). J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121732] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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8
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Shahabadi N, Zendehcheshm S, Momeni BZ, Abbasi R. Antiproliferative activity and human serum albumin binding propensity of [SnMe2Cl2(bu2bpy)]: multi-spectroscopic analysis, atomic force microscopy, and computational studies. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1775821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Nahid Shahabadi
- Department of Inorganic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran
- Medical Biology Research Center (MBRC), Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Saba Zendehcheshm
- Department of Inorganic Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran
| | - Badri Z Momeni
- Faculty of Chemistry, KN Toosi University of Technology, Tehran, Iran
| | - Reyhaneh Abbasi
- Faculty of Chemistry, KN Toosi University of Technology, Tehran, Iran
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9
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Zhao J, Huang L, Sun C, Zhao D, Tang H. Studies on the structure-activity relationship and interaction mechanism of flavonoids and xanthine oxidase through enzyme kinetics, spectroscopy methods and molecular simulations. Food Chem 2020; 323:126807. [PMID: 32330646 DOI: 10.1016/j.foodchem.2020.126807] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/25/2020] [Accepted: 04/13/2020] [Indexed: 12/14/2022]
Abstract
In this study, some flavonoids were screened as potent xanthine oxidase (XO) inhibitors in vitro. Flavonoid 9 was demonstrated to exhibit the inhibitory activity through a ping-pong mechanism. Further structure-activity relationship revealed that different structural elements had greatly influenced the inhibition effect on XO and underlined the requirement of hydroxyl groups at C5 and C4' of flavonoid type I. Moreover, some bioactive flavonoids could efficiently quench the intrinsic fluorescence of XO by either static or static-dynamic mixed mechanism. The synchronous fluorescence, ANS-binding fluorescence, Fourier transform infrared spectra and circular dichroism suggested that active flavonoids could bind to the active center of XO, prevent the entrance of substrate, and induce the rearrangement and conformation change of its secondary structures, ultimately resulting in the significant inhibition effect. Additionally, molecular docking further confirmed these conclusions and highlighted the great importance of hydrophobic interactions and hydrogen bonds for the formation of stable complex conformation.
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Affiliation(s)
- Jie Zhao
- College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, PR China
| | - Lin Huang
- Blood Purification Center, Affiliated Yijishan Hospital of Wannan Medical College, Wuhu 241001, PR China
| | - Chunyong Sun
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
| | - Dongsheng Zhao
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China.
| | - Hongjin Tang
- College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, PR China.
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10
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Yuan H, Gong J, Tang K, Huang J, Xiao G, Lv J. Milk oligopeptide inhibition of (α)-tocopherol fortified linoleic acid oxidation. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2019. [DOI: 10.1080/10942912.2019.1657888] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Haina Yuan
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Jinyan Gong
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Kun Tang
- Department of Endocrinology, The Affiliated Hospital of Guizhou Medical University, Guiyang, GZ, China
| | - Jinge Huang
- Department of Biological Engineering, Utah State University, Logan, UT, USA
| | - Gongnian Xiao
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, Zhejiang Provincial Collaborative Innovation Center of Agricultural Biological Resources Biochemical Manufacturing, Zhejiang Provincial Key Lab for Chem&Bio Processing Technology of Farm Produces, Hangzhou, ZJ, China
| | - Jianmin Lv
- Laboratory Animal Research Center, Zhejiang Chinese Medical University, Hangzhou, ZJ, China
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11
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Tang H, Ma F, Zhao D. Integrated multi-spectroscopic and molecular modelling techniques to probe the interaction mechanism between salvianolic acid A and α‑glucosidase. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 218:51-61. [PMID: 30954797 DOI: 10.1016/j.saa.2019.03.109] [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: 10/04/2018] [Revised: 03/21/2019] [Accepted: 03/28/2019] [Indexed: 06/09/2023]
Abstract
α-Glucosidase (AG) is an important drug target for the treatment of type 2 diabetes mellitus in humans due to the potential effect of down regulating glucose absorption in patients. In our previous study, salvianolic acid A (SAA) was found to exhibit potent AG inhibitory activity, whereas the interaction mechanism was still ambiguous. Herein, the interaction mechanism of SAA and AG was investigated by multi-spectroscopic methods along with molecular docking. As a result, it was found that SAA reversibly inhibited AG in a competitive manner with IC50 of 16.44 ± 0.18 μM, and the inhibition belonged to a multi-phase kinetics process with a first-order reaction. The intrinsic fluorescence of AG could be strongly quenched by SAA through a static quenching mechanism. The negative Gibbs free energy change and positive values of enthalpy and entropy change revealed that the binding of SAA to AG was spontaneous and dominated mainly by hydrophobic interactions, and only a single binding site was determined for them. Analysis of synchronous fluorescence, ANS-binding fluorescence, circular dichroism and Fourier transform infrared spectra suggested that the binding of SAA to AG induced rearrangement and conformational changes of the enzyme. Besides, further molecular modelling validated that SAA could bind to the active domain and prevent the entrance of substrate, resulting in the inhibition of AG activity. These findings provide new insights into understanding the interaction mechanism of SAA on AG.
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Affiliation(s)
- Hongjin Tang
- College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, PR China.
| | - Fei Ma
- Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan 250011, PR China
| | - Dongsheng Zhao
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
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12
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Effect of Salvia miltiorrhiza on acetylcholinesterase: Enzyme kinetics and interaction mechanism merging with molecular docking analysis. Int J Biol Macromol 2019; 135:303-313. [PMID: 31128195 DOI: 10.1016/j.ijbiomac.2019.05.132] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 11/22/2022]
Abstract
Acetylcholinesterase (AchE) serves as an important target for Alzheimer's disease. Salvia miltiorrhiza has been used to treat cardiovascular disease for hundreds of years. However, the interaction between S. miltiorrhiza and AchE is still inadequate. Herein, an integrated method including molecular docking and experimental studies was employed to investigate the interaction. Consequently, some components were screened as potent AchE inhibitors by in silico and in vitro. Among them, miltirone (MT) and salvianolic acid A (SAA) reversibly inhibited AchE in a mixed-competitive manner. Fluorescence data revealed that SAA and salvianolic acid C (SAC) strongly quenched the intrinsic fluorescence of AchE through a static quenching mechanism, and the binding was spontaneous and dominated by hydrophobic interaction inferred by the thermodynamic parameters. The synchronous and ANS-binding fluorescence spectra suggested that SAA and SAC could bind to the enzyme and induce its conformation changes of secondary structures, which was further confirmed by Fourier transform infrared spectra. Meanwhile, molecular docking presented the probable binding modes of inhibitors to AchE and highlighted the key role of hydrophobic interaction and hydrogen bonds for the stability of docking complex. These findings put more insights into understanding the interaction of S. miltiorrhiza chemicals and AchE, as well as Alzheimer's disease.
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13
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Tang H, Zhao D. Investigation of the interaction between salvianolic acid C and xanthine oxidase: Insights from experimental studies merging with molecular docking methods. Bioorg Chem 2019; 88:102981. [PMID: 31085372 DOI: 10.1016/j.bioorg.2019.102981] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 05/06/2019] [Accepted: 05/08/2019] [Indexed: 12/26/2022]
Abstract
Xanthine oxidase (XO) has emerged as an important target for gout. In our previous study, salvianolic acid C (SAC) was found to show potent XO inhibitory activity, whereas the interaction mechanism was still not clear. Herein, an integrated approach consisting of enzyme kinetics, multi-spectroscopic methods and molecular docking was employed to investigate the interaction between SAC and XO. Consequently, SAC exhibited a rapid and mixed-type inhibition of XO with IC50 of 5.84 ± 0.18 μM. The fluorescence data confirmed that SAC presented a strong fluorescence quenching effect through a static quenching procedure. The values of enthalpy change, entropy change and Gibbs free energy change indicated that their binding was spontaneous and driven mainly by hydrophobic interactions. Analysis of synchronous fluorescence, circular dichroism and fourier transform infrared spectra demonstrated that SAC induced conformational changes of the enzyme. Besides, further molecular docking revealed that SAC occupied the catalytic center resulting in the inhibition of XO activity. This study provides a comprehensive understanding on the interaction mechanism of SAC on XO.
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Affiliation(s)
- Hongjin Tang
- College of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu 241000, PR China.
| | - Dongsheng Zhao
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, PR China
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14
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Tang H, Ma F, Zhao D, Xue Z. Exploring the effect of salvianolic acid C on α-glucosidase: Inhibition kinetics, interaction mechanism and molecular modelling methods. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.01.011] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Ma YJ, Wu JH, Li X, Xu XB, Wang ZY, Wu C, Du M, Song L. Effect of alkyl distribution in pyrazine on pyrazine flavor release in bovine serum albumin solution. RSC Adv 2019; 9:36951-36959. [PMID: 35539035 PMCID: PMC9075160 DOI: 10.1039/c9ra06720e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 10/28/2019] [Indexed: 01/13/2023] Open
Abstract
The flavor release mechanism related to the interaction of aroma compounds with proteins is still unclear. In this study, the interaction of protein with pyrazine homologues, such as 2-methylpyrazine (MP), 2,5-dimethylpyrazine (DP), 2,3,5-trimethylpyrazine (TRP) and 2,3,5,6-tetramethylpyrazine (TEP), was investigated to elucidate the effect of alkyl distribution in a pyrazine ring on its flavor release in bovine serum albumin (BSA) solution (pH 7.4). The results of SPME-GC-MS indicated that methyl distribution in a pyrazine ring significantly affected its release from BSA solution. The pyrazines released from BSA solution with an increasing order of MP, DP, TRP and TEP. The inhibition mechanism of alkyl-pyrazine release was further elucidated by the interaction between alkyl-pyrazines and BSA using multiple spectroscopic methods. The non-covalent interaction between alkyl-pyrazines and BSA was confirmed as the main interaction force by the value of the bimolecular quenching constant (Kq > 2 × 1010 L mol−1 s−1). A decrease in the hydrophobicity of the microenvironment between the alkyl-pyrazine and BSA was detected by synchronous fluorescence spectra, which revealed that alkyl-pyrazines were mainly bound on the sites of tyrosine and tryptophan in BSA. The UV-vis absorption spectra and circular dichromatic (CD) spectrum revealed that alkyl-pyrazines could induce polarity and conformation change of BSA. The above results indicated that the structure of the flavor homologues can affect their release in food matrices. The methyl groups on the pyrazine ring affect the interaction of pyrazines with BSA. The non-covalent interaction between alkyl-pyrazines and BSA was confirmed. Alkyl-pyrazines could induce the polarity and conformation change of BSA.![]()
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Affiliation(s)
- Yun-Jiao Ma
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Jian-Hai Wu
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Xiang Li
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Xian-Bing Xu
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Zhen-Yu Wang
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Chao Wu
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Ming Du
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
| | - Liang Song
- National Engineering Research Center of Seafood
- School of Food Science and Technology
- Dalian Polytechnic University
- Dalian 116034
- China
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16
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Wu J, Bi SY, Sun XY, Zhao R, Wang JH, Zhou HF. Study on the interaction of fisetholz with BSA/HSA by multi-spectroscopic, cyclic voltammetric, and molecular docking technique. J Biomol Struct Dyn 2018; 37:3496-3505. [DOI: 10.1080/07391102.2018.1518789] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jun Wu
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
| | - Shu-Yun Bi
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
| | - Xiao-Yue Sun
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
| | - Rui Zhao
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
| | - Ji-Hong Wang
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
| | - Hui-Feng Zhou
- College of Chemistry, Changchun Normal University, Changchun, P.R. China
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17
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Characterization of the structural changes of human serum albumin upon interaction with single-walled and multi-walled carbon nanotubes: spectroscopic and molecular modeling approaches. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3608-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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18
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Guan J, Yan X, Zhao Y, Sun Y, Peng X. Binding studies of triclocarban with bovine serum albumin: Insights from multi-spectroscopy and molecular modeling methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 202:1-12. [PMID: 29777928 DOI: 10.1016/j.saa.2018.04.070] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 04/13/2018] [Accepted: 04/29/2018] [Indexed: 06/08/2023]
Abstract
The antimicrobial triclocarban (TCC) is frequently found in various personal care products (PCPs), and recent studies have demonstrated that it shows a high unintended biological activity on humans and wildlife. To evaluate the toxicity of TCC at the protein level, the effect of TCC on bovine serum albumin (BSA) has been investigated using various spectroscopic methods in combination with molecular modeling. Analysis of fluorescence quenching data of BSA revealed the formation of a ground state BSA-TCC complex with a binding constant of 2.58 × 104 M-1 at 298 K. The values of the thermodynamic parameters suggested that the binding of TCC to BSA was driven mainly by hydrophobic interaction and hydrogen bond. Site marker competitive experiments coupled with molecular docking studies confirmed that site I was the main binding site for TCC on BSA. Furthermore, TCC binding to BSA led to conformational and structural alterations of BSA as revealed by multi-spectroscopic studies. In addition, the stability of BSA and BSA-TCC complex were well analyzed by the molecular dynamics studies. In short, this work indicated that TCC could interact with BSA and impact the conformation of BSA, which could provide valuable information to understand the toxicity mechanism of TCC.
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Affiliation(s)
- Jiao Guan
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
| | - Xin Yan
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
| | - Yajing Zhao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Yinhe Sun
- Tianjin Institute of Metrological Supervision and Testing, Nankai District, Tianjin 300192, PR China
| | - Xin Peng
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China.
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19
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Mechanistic insights into the inhibition of quercetin on xanthine oxidase. Int J Biol Macromol 2018; 112:405-412. [DOI: 10.1016/j.ijbiomac.2018.01.190] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 01/26/2018] [Accepted: 01/29/2018] [Indexed: 11/21/2022]
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20
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Karami K, Rafiee M, Lighvan ZM, Zakariazadeh M, Faal AY, Esmaeili SA, Momtazi-Borojeni AA. Synthesis, spectroscopic characterization and in vitro cytotoxicities of new organometallic palladium complexes with biologically active β-diketones; Biological evaluation probing of the interaction mechanism with DNA/Protein and molecular docking. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.10.059] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Hasanzadeh A, Dehghan G, Shaghaghi M, Panahi Y, Jouyban A, Yekta R. Multispectral and molecular docking studies on the interaction of human serum albumin with iohexol. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.096] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Shao L, Zhang A, Rong Z, Wang C, Jia X, Zhang K, Xiao R, Wang S. Fast and non-invasive serum detection technology based on surface-enhanced Raman spectroscopy and multivariate statistical analysis for liver disease. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2017; 14:451-459. [PMID: 29197594 DOI: 10.1016/j.nano.2017.11.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 10/21/2017] [Accepted: 11/23/2017] [Indexed: 02/04/2023]
Abstract
This study explored a rapid and nondestructive liver disease detection technique based on surface-enhanced Raman spectroscopy (SERS) to realize the early diagnosis, prevention, and treatment of liver disease. SERS signals of serum were obtained from 304 normal individuals, 333 patients with hepatopathy, and 99 patients with esophageal cancer. The Raman spectra of different diseases were compared and diagnostic models of liver disease were established using orthogonal partial least squares discriminant analysis (OPLS-DA). The classification efficiencies of the different models were comprehensively evaluated through the receiver operating characteristic (ROC) curve and ten-fold cross validation. Area under the ROC curve is of greater than 0.97, indicating excellent classification of the groups. The accuracy rate of the test set reached 95.33%, and the lowest was 81.76% using the ten-fold cross validation. Thus, OPLS-DA combined with serum SERS is a rapid and non-invasive technique for the diagnosis of liver disease.
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Affiliation(s)
- Liting Shao
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Aiying Zhang
- Beijing Institute of Hepatology, Beijing YouAn Hospital, Capital Medical University, Beijing, China
| | - Zhen Rong
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Chongwen Wang
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Xiaofei Jia
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Kehan Zhang
- Beijing Institute of Radiation Medicine, Beijing, PR China
| | - Rui Xiao
- Beijing Institute of Radiation Medicine, Beijing, PR China.
| | - Shengqi Wang
- Beijing Institute of Radiation Medicine, Beijing, PR China.
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23
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Atarodi Shahri P, Sharifi Rad A, Beigoli S, Saberi MR, Chamani J. Human serum albumin–amlodipine binding studied by multi-spectroscopic, zeta-potential, and molecular modeling techniques. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2017. [DOI: 10.1007/s13738-017-1226-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Karami K, Mehri Lighvan Z, Farrokhpour H, Dehdashti Jahromi M, Momtazi-Borojeni AA. Synthesis and spectroscopic characterization study of new palladium complexes containing bioactive O,O-chelated ligands: evaluation of the DNA/protein BSA interaction, in vitro antitumoural activity and molecular docking. J Biomol Struct Dyn 2017; 36:3324-3340. [PMID: 29019431 DOI: 10.1080/07391102.2017.1391125] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
[Pd{(C,N)-C6H4CH2NH(Et) (Qu)] (2) and [Pd{(C,N)-C6H4CH2NH(Et) (Nar)] (3) (Qu = Quercetin, Nar = Naringin) mononuclear palladium (II) complexes have been synthesized and characterized using elemental analysis, IR and electronic spectroscopy. The interaction of the prepared complexes with calf thymus DNA and bovine serum albumin (BSA), monitored by UV-visible and fluorescence titrations, respectively, have been carried out to better understand the mode of their action under biological conditions. Intercalative binding mode between the complexes and DNA is suggested by the binding constant (Kb) values of 2.5 × 106 and 3.2 × 106 for complexes 2 and 3, respectively. In particular, the in vitro cytotoxicity of the complexes on two cancer cells lines (bladder carcinoma TCC and breast cancer MCF7) showed that the compounds had broad spectrum, anti-cancer activity with low IC50 values and the order of in vitro anticancer activities is consistent with the DNA-binding affinities. In the meantime, the quenching of tryptophan emission with the addition of complexes using BSA as a model protein indicated the protein binding ability. The quenching mechanisms of BSA by the complexes were static processes, according to the results obtained. The competitive binding using Warfarin, Digoxin and Ibuprofen site markers, which contain definite biding sites, demonstrated that the complexes bind to site I on BSA. Ultimately, the binding sites of DNA and BSA with the complexes have been determined by molecular modelling studies.
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Affiliation(s)
- Kazem Karami
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156/83111 , Iran
| | - Zohreh Mehri Lighvan
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156/83111 , Iran
| | - Hossein Farrokhpour
- a Department of Chemistry , Isfahan University of Technology , Isfahan 84156/83111 , Iran
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25
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M M, Hosakere D. R. Detailed investigation of effects of Zn 2+ , Fe 2+ and Cu 2+ metal ions on the binding interaction between eletriptan hydrochloride an anti-migraine headache drug and bovine serum albumin by various spectrometric techniques and molecular docking studies. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.04.072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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26
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Ma L, Wang J, Zhang Y. Probing the Characterization of the Interaction of Aflatoxins B1 and G1 with Calf Thymus DNA In Vitro. Toxins (Basel) 2017; 9:E209. [PMID: 28671585 PMCID: PMC5535156 DOI: 10.3390/toxins9070209] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 06/20/2017] [Accepted: 06/28/2017] [Indexed: 11/16/2022] Open
Abstract
The binding characterization of aflatoxins with calf thymus DNA (ctDNA) under physiological conditions was investigated. Multispectroscopic techniques, ctDNA melting, viscosity measurements, and molecular docking techniques were employed to elucidate the binding mechanism of the aflatoxins with DNA. The fluorescence results indicated that both aflatoxin B1 (AFB1) and aflatoxin G1 (AFG1) bound to the ctDNA, forming complexes through hydrogen bonding. The binding constants of AFB1 and AFG1 with ctDNA reached up to 10³ L·mol-1 and 10⁴ L·mol-1, respectively, and AFG1 exhibited a higher binding propensity than that of AFB1. Furthermore, both AFB1 and AFG1 bound to the ctDNA through groove binding, as evidenced by the results of the spectroscopic, iodide quenching effect, viscosity, and ctDNA melting measurements. Changes in the circular dichroism signal manifested that both AFB1 and AFG1 induced an increase in the right-handed helicity, but only minimally influenced the base stacking of the DNA. A molecular docking study of the aflatoxin's binding with the DNA revealed a groove binding mode, which was driven mainly by hydrogen bonding. This study of aflatoxin-ctDNA interaction may provide novel insights into the toxicological effect of the mycotoxins.
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Affiliation(s)
- Liang Ma
- College of Food Science, Southwest University, Beibei District, Chongqing 400715, China.
| | - Jiaman Wang
- College of Food Science, Southwest University, Beibei District, Chongqing 400715, China.
| | - Yuhao Zhang
- College of Food Science, Southwest University, Beibei District, Chongqing 400715, China.
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27
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Zhou Q, Wang H, Zhu K, Zhu L, Zhou S, Peng J, Lu X. Effects of ultrasound irradiation on enzymatic hydrolysis of protein and application for the determination of tetracyclines in complex matrices. Drug Test Anal 2017; 9:1586-1593. [PMID: 28262009 DOI: 10.1002/dta.2181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 02/26/2017] [Accepted: 02/28/2017] [Indexed: 11/09/2022]
Abstract
The widespread use of tetracyclines (TCs) in food animals has led to concerns regarding unsafe residue levels in feed, food and manure. The determination of TCs in such matrices suffers from interference by the interactions between proteins and TCs. Three deproteination methods were compared in this study. In contrast with acid deproteination, which caused a large loss of TCs due to the strong adsorption of TCs on protein precipitates, a normal enzymatic hydrolysis was confirmed to have a merit of effectively releasing TCs from protein matrices, but required treatment time as long as 16 h. The adoption of ultrasound irradiation was proposed to shorten the enzymatic hydrolysis time. After investigating the effects of ultrasound power and irradiation time, the conditions of the ultrasound-enhanced enzymatic hydrolysis were optimized as ultrasound power of 100 W and irradiation time of 6 min. The ultrasound-enhanced enzymatic hydrolysis treatment of 6 min yielded recovery of TCs (from protein-containing matrices) as high as that obtained by the normal enzymatic hydrolysis treatment of 16 h. The acceleration effect of ultrasound irradiation was attributed to ultrasound-induced cavitation, which increased exposure of both the functional groups of trypsin and the C-terminal amino acid in the protein that was a cleavage site for trypsin attack. When the ultrasound-enhanced enzymatic hydrolysis method was used to determine TCs in complex matrices, it was found that this new method achieved recoveries of 89.5, 117.7, 110.4 and 100.0% for oxytetracycline, tetracycline, chlortetracycline and doxycycline, being much higher than those (29.6-39.4%) obtained using the common acid deproteination process. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Qian Zhou
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China.,College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Hongshan district, Wuhan, 430074, PR China
| | - Hong Wang
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China
| | - Kuanzheng Zhu
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China
| | - Lihua Zhu
- College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Hongshan district, Wuhan, 430074, PR China
| | - Shengyin Zhou
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China
| | - Jin Peng
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China
| | - Xiya Lu
- Hubei Research Institute of Products Quality Supervision and Inspection, Wuchang District, Wuhan, 430070, PR China
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28
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Zhang C, Zhang G, Pan J, Gong D. Galangin competitively inhibits xanthine oxidase by a ping-pong mechanism. Food Res Int 2016; 89:152-160. [DOI: 10.1016/j.foodres.2016.07.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 07/15/2016] [Accepted: 07/24/2016] [Indexed: 10/21/2022]
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29
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Lin S, Zhang G, Liao Y, Gong D. The inhibitory kinetics and mechanism of dietary vitamins D3and B2on xanthine oxidase. Food Funct 2016; 7:2849-61. [DOI: 10.1039/c6fo00491a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dietary guidelines to promote health are usually based on the patterns’ prediction on disease risk of foods and nutrients.
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Affiliation(s)
- Suyun Lin
- 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
- State Key Laboratory of Food Science and Technology
- Nanchang University
- Nanchang 330047
- China
| | - Deming Gong
- School of Biological Sciences
- The University of Auckland
- Auckland 1142
- New Zealand
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30
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Lin S, Zhang G, Pan J, Gong D. Deciphering the inhibitory mechanism of genistein on xanthine oxidase in vitro. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2015; 153:463-72. [DOI: 10.1016/j.jphotobiol.2015.10.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 10/19/2015] [Accepted: 10/27/2015] [Indexed: 10/22/2022]
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31
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Peng X, Wang X, Qi W, Huang R, Su R, He Z. Deciphering the binding patterns and conformation changes upon the bovine serum albumin-rosmarinic acid complex. Food Funct 2015; 6:2712-26. [PMID: 26146359 DOI: 10.1039/c5fo00597c] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Rosmarinic acid (RA) is an importantly and naturally occurring polyphenol from plants of the mint family with potent biological activities. Here, the in vitro interaction of RA with bovine serum albumin (BSA) has been investigated using various biophysical approaches as well as molecular modeling methods, to ascertain its binding mechanism and conformational changes. The fluorescence results demonstrated that the fluorescence quenching of BSA by RA was mainly the result of the formation of a ground state BSA-RA complex, and BSA had one high affinity RA binding site with a binding constant of 4.18 × 10(4) mol L(-1) at 298 K. Analysis of thermodynamic parameters revealed that hydrophobic and hydrogen bond interactions were the dominant intermolecular force in the complex formation. The primary binding site of RA in BSA (site I) had been identified by site marker competitive experiments. The distance between RA and the tryptophan residue of BSA was evaluated at 3.12 nm based on Förster's theory of non-radiation energy transfer. The UV-vis absorption, synchronous fluorescence, three-dimensional fluorescence, 8-anilino-1-naphthalenesulfonic acid (ANS) fluorescence, circular dichroism (CD), and Fourier transform infrared (FT-IR) spectra confirmed that the conformation and structure of BSA were altered in the presence of RA. Moreover, the nuclear magnetic spectroscopy showed that the aromatic groups of RA took part in the binding reaction during the BSA-RA complexation. In addition, the molecular picture of the interaction mechanism between BSA and RA at the atomic level was well examined by molecular docking and dynamics studies. In brief, RA can bind to BSA with noncovalent bonds in a relatively stable way, and these findings will be beneficial to the functional food research of RA.
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Affiliation(s)
- Xin Peng
- School of Life Sciences, Tianjin University, Tianjin 300072, PR China
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32
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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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33
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Rakotoarivelo NV, Perio P, Najahi E, Nepveu F. Interaction between Antimalarial 2-Aryl-3H-indol-3-one Derivatives and Human Serum Albumin. J Phys Chem B 2014; 118:13477-85. [DOI: 10.1021/jp507569e] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Nambinina V. Rakotoarivelo
- UPS,
PHARMA-DEV, UMR 152, Université de Toulouse, 118 Route de
Narbonne, F-31062 Toulouse cedex 9, France
- IRD,
UMR 152, Université de Toulouse, F-31062 Toulouse
cedex 9, France
| | - Pierre Perio
- UPS,
PHARMA-DEV, UMR 152, Université de Toulouse, 118 Route de
Narbonne, F-31062 Toulouse cedex 9, France
- IRD,
UMR 152, Université de Toulouse, F-31062 Toulouse
cedex 9, France
| | - Ennaji Najahi
- UPS,
PHARMA-DEV, UMR 152, Université de Toulouse, 118 Route de
Narbonne, F-31062 Toulouse cedex 9, France
- IRD,
UMR 152, Université de Toulouse, F-31062 Toulouse
cedex 9, France
| | - Françoise Nepveu
- UPS,
PHARMA-DEV, UMR 152, Université de Toulouse, 118 Route de
Narbonne, F-31062 Toulouse cedex 9, France
- IRD,
UMR 152, Université de Toulouse, F-31062 Toulouse
cedex 9, France
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34
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Yang W, Liu F, Xu C, Yuan F, Gao Y. Molecular interaction between (−)-epigallocatechin-3-gallate and bovine lactoferrin using multi-spectroscopic method and isothermal titration calorimetry. Food Res Int 2014; 64:141-149. [DOI: 10.1016/j.foodres.2014.06.001] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Revised: 05/17/2014] [Accepted: 06/03/2014] [Indexed: 10/25/2022]
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35
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Spectroscopic and molecular simulation studies on the interaction of di-(2-ethylhexyl) phthalate and human serum albumin. LUMINESCENCE 2014; 30:198-206. [DOI: 10.1002/bio.2713] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 04/28/2014] [Accepted: 05/07/2014] [Indexed: 11/07/2022]
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36
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Meti MD, Nandibewoor ST, Chimatadar SA. Binding studies of lincosamide antibiotic drug clindamycin phosphate to human serum albumin by fluorescence, 3D, and circular dichroism spectroscopy. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1207-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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37
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38
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Shahabadi N, Hadidi S. Molecular modeling and spectroscopic studies on the interaction of the chiral drug venlafaxine hydrochloride with bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 122:100-106. [PMID: 24299981 DOI: 10.1016/j.saa.2013.11.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 11/03/2013] [Accepted: 11/05/2013] [Indexed: 06/02/2023]
Abstract
This study was designed to examine the interaction of racemic antidepressant drug "S,R-venlafaxine hydrochloride (VEN)" with bovine serum albumin (BSA) under physiological conditions. The mechanism of interaction was studied by spectroscopic techniques combination with molecular modeling. Stern-Volmer analysis of fluorescence quenching data shows the presence of the static quenching mechanism. The thermodynamic parameters indicated that the hydrogen bonding and weak van der Waals interactions are the predominant intermolecular forces stabilizing the complex. The number of binding sites (n) was calculated. Through the site marker competitive experiment, VEN was confirmed to be located in subdomain IIIA of BSA. The binding distance (r=4.93 nm) between the donor BSA and acceptor VEN was obtained according to Förster's non-radiative energy transfer theory. According to UV-vis spectra and CD data binding of VEN leaded to conformational changes of BSA. Molecular docking simulations of S and R-VEN revealed that both isomers have similar interaction and the same binding sites, from this point of view S and R isomers are equal.
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Affiliation(s)
- Nahid Shahabadi
- Inorganic Chemistry Department, Faculty of Chemistry, Razi University, Kermanshah, Iran.
| | - Saba Hadidi
- Inorganic Chemistry Department, Faculty of Chemistry, Razi University, Kermanshah, Iran
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39
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Study of the Interaction Between Coenzyme Q10 and Human Serum Albumin: Spectroscopic Approach. J SOLUTION CHEM 2014. [DOI: 10.1007/s10953-014-0146-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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40
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Wang Y, Zhang G, Wang L. Interaction of prometryn to human serum albumin: insights from spectroscopic and molecular docking studies. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2014; 108:66-73. [PMID: 24485317 DOI: 10.1016/j.pestbp.2013.12.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Revised: 12/30/2013] [Accepted: 12/30/2013] [Indexed: 06/03/2023]
Abstract
Prometryn possesses much potential hazard to environment because of its chemical stability and biological toxicity. Here, the binding properties of prometryn with human serum albumin (HSA) and the protein structural changes were determined under simulative physiological conditions (pH 7.4) by multispectroscopic methods including fluorescence, UV-vis absorption, Fourier transform infrared (FT-IR) and circular dichroism (CD) spectroscopy, coupled with molecular modeling technique. The result of fluorescence titration suggested that the fluorescence quenching of HSA by prometryn was considered as a static quenching procedure. The negative enthalpy change (ΔH(○)) and positive entropy change (ΔS(○)) values indicated that the binding process was governed mainly by hydrophobic interactions and hydrogen bonds. The site marker displacement experiments suggested the location of prometryn binding to HSA was Sudlow's site I in subdomain IIA. Furthermore, molecular docking studies revealed prometryn can bind in the large hydrophobic activity of subdomain IIA. Analysis of UV-vis absorption, synchronous fluorescence, CD and FT-IR spectra demonstrated that the addition of prometryn resulted in rearrangement and conformational alteration of HSA with reduction in α-helix and increases in β-sheet, β-turn and random coil structures. This work provided reasonable model helping us further understand the transportation, distribution and toxicity effect of prometryn when it spreads into human blood serum.
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Affiliation(s)
- Yaping Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China
| | - Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China.
| | - Langhong Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, 235 Nanjing East Road, Nanchang 330047, China
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He X, Song Z. Study on the proteins-luminol binding by use of luminol as a fluorescence probe. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:231-235. [PMID: 23770511 DOI: 10.1016/j.saa.2013.05.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 01/28/2013] [Accepted: 05/19/2013] [Indexed: 06/02/2023]
Abstract
In this paper, a new mathematical equation of lg(F0-F)/F=1/nlg[P]+1/nlgKa, which was used to obtain interaction parameters (the binding constant Ka and the number of binding sites n) between the protein and the small molecule ligand by using the ligand as a fluorescence (FL) probe, was constructed for the first time. The interaction parameters between myoglobin, catalase, lysozyme, bovine serum albumin (BSA) and luminol were obtained by this equation with luminol used as a FL probe, showing that the binding constants Ka were 8.78×10(5), 4.47×10(5), 4.21×10(4) and 3.95×10(4) respectively, and the number of binding sites n approximately equaled to 1.0 for myoglobin, catalase, and 2.0 for lysozyme, BSA. The interactions of ferritin, ovalbumin, aldolase, chymotrypsinogen and ribonuclease with luminol were also studied by this method. The binding constants Ka were at 10(4)-10(5) level, and the number of binding sites n mostly approximately equaled to 2.0. The binding ability of luminol to the studied proteins followed the pattern: myoglobin>aldolase>ferritin>ovalbumin>catalase>ribonuclease>lysozyme>BSA>chymotrypsinoge.
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Affiliation(s)
- Xili He
- School of Science, Xi'an Jiaotong University, Xi'an 710049, China
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42
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Sulfadiazine binds and unfolds bovine serum albumin: an in vitro study. Mol Biol Rep 2013; 40:6081-90. [DOI: 10.1007/s11033-013-2719-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 09/14/2013] [Indexed: 12/16/2022]
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43
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Sattar Z, Iranfar H, Asoodeh A, Saberi MR, Mazhari M, Chamani J. Interaction between holo transferrin and HSA-PPIX complex in the presence of lomefloxacin: an evaluation of PPIX aggregation in protein-protein interactions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:1089-1100. [PMID: 22925987 DOI: 10.1016/j.saa.2012.07.034] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 07/08/2012] [Accepted: 07/10/2012] [Indexed: 06/01/2023]
Abstract
Human serum albumin (HSA) and holo transferrin (TF) are two serum carrier proteins that are able to interact with each other, thereby altering their binding behavior toward their ligands. During the course of this study, the interaction between HSA-PPIX and TF, in the presence and absence of lomefloxacin (LMF), was for the first time investigated using different spectroscopic and molecular modeling techniques. Fluorescence spectroscopy experiments were performed in order to study conformational changes of proteins. The RLS technique was utilized to investigate the effect of LMF on J-aggregation of PPIX, which is the first report of its kind. Our findings present clear-cut evidence for the alteration of interactions between HSA and TF in the presence of PPIX and changes in drug-binding to HSA and HSA-PPIX complex upon interaction with TF. Moreover, molecular modeling studies suggested that the binding site for LMF became switched in the presence of PPIX, and that LMF bound to the site IIA of HSA. The obtained results should give new insight into research in this field and may cast some light on the dynamics of drugs in biological systems.
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Affiliation(s)
- Zohreh Sattar
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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44
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Multispectroscopic studies on the interaction of maltol, a food additive, with bovine serum albumin. Food Chem 2012; 133:264-70. [DOI: 10.1016/j.foodchem.2012.01.014] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 12/28/2011] [Accepted: 01/05/2012] [Indexed: 11/24/2022]
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45
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Zhang G, Hu X, Fu P. Spectroscopic studies on the interaction between carbaryl and calf thymus DNA with the use of ethidium bromide as a fluorescence probe. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2012; 108:53-61. [DOI: 10.1016/j.jphotobiol.2011.12.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 12/27/2011] [Accepted: 12/28/2011] [Indexed: 10/14/2022]
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46
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Liu Q, Zhou P, Chen Y. In vitro investigation of the interaction between pentachlorophenol and alkaline phosphatase by spectroscopic methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 87:298-302. [PMID: 22188648 DOI: 10.1016/j.saa.2011.11.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 11/22/2011] [Accepted: 11/27/2011] [Indexed: 05/31/2023]
Abstract
The interaction characteristics of alkaline phosphatase (ALP) with pentachlorophenol (PCP) were investigated using fluorescence, UV-vis absorption, and circular dichroism (CD) techniques. Results obtained from analysis of fluorescence intensity indicated that PCP has a strong ability to quench the intrinsic fluorescence of ALP through a static quenching procedure. The thermodynamic parameters ΔH and ΔS were observed to be -4.60kJmol(-1) and 54.59Jmol(-1)K(-1), respectively, and the value of ΔG was negative. These results indicate that the binding reactions were spontaneous, and both hydrophobic and electrostatic forces were involved in the interaction of PCP and ALP. Based on Forster's theory of non-radiation energy transfer, the binding distance, r, between the ALP and PCP was evaluated to be 2.50nm and the critical distance R(0) was 2.26nm. The CD spectra results showed that the α-helicity was decreased from 49.68% in native ALP to 47.28% in PCP-ALP systems, which indicate the secondary structure of ALP was changed slightly in the presence of PCP.
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Affiliation(s)
- Qiongyu Liu
- School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
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Zhang G, Fu P, Wang L, Hu M. Molecular spectroscopic studies of farrerol interaction with calf thymus DNA. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:8944-8952. [PMID: 21761894 DOI: 10.1021/jf2019006] [Citation(s) in RCA: 149] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The interaction between farrerol and calf thymus DNA in a pH 7.4 Tris-HCl buffer was investigated with the use of neutral red (NR) dye as a spectral probe by UV-vis absorption, fluorescence, and circular dichroism (CD) spectroscopy, as well as viscosity measurements and DNA melting techniques. It was found that farrerol molecules could intercalate into the base pairs of DNA as evidenced by decreases in iodide quenching effect and single-stranded DNA (ssDNA) quenching effect, induced CD spectral changes, and significant increases in relative viscosity and denaturation temperature of DNA. Furthermore, the spectral data matrix of the competitive reaction between farrerol and NR with DNA was resolved with an alternative least-squares (ALS) algorithm, and the concentration profiles in the reaction and the corresponding pure spectra for three species (farrerol, NR, and DNA-NR complex) were obtained. This ALS analysis demonstrated the intercalation of farrerol to the DNA by substituting for NR in the DNA-NR complex. Moreover, the thermodynamic parameters enthalpy change (ΔH°) and entropy change (ΔS°) were calculated to be -16.49 ± 0.51 kJ mol(-1) and 32.47 ± 1.02 J mol(-1) K(-1) via the van't Hoff equation, which suggested that the binding of farrerol to DNA was driven mainly by hydrophobic interactions and hydrogen bonds.
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Affiliation(s)
- Guowen Zhang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, China.
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Kumar RS, Paul P, Riyasdeen A, Wagniéres G, van den Bergh H, Akbarsha M, Arunachalam S. Human serum albumin binding and cytotoxicity studies of surfactant–cobalt(III) complex containing 1,10-phenanthroline ligand. Colloids Surf B Biointerfaces 2011; 86:35-44. [DOI: 10.1016/j.colsurfb.2011.03.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 02/03/2011] [Accepted: 03/15/2011] [Indexed: 10/18/2022]
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49
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50
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Ibrahim N, Ibrahim H, Kim S, Nallet JP, Nepveu F. Interactions between Antimalarial Indolone-N-oxide Derivatives and Human Serum Albumin. Biomacromolecules 2010; 11:3341-51. [DOI: 10.1021/bm100814n] [Citation(s) in RCA: 231] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Nehal Ibrahim
- Université de Toulouse 3, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), F-31062 Toulouse cedex 9, France, IRD, UMR 152, F-31062 Toulouse cedex 9, France, and IDEALP-PHARMA, Bâtiment CEI, 66 Bd Niels Bohr, BP 2132, 69603 Villeurbanne cedex, France
| | - Hany Ibrahim
- Université de Toulouse 3, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), F-31062 Toulouse cedex 9, France, IRD, UMR 152, F-31062 Toulouse cedex 9, France, and IDEALP-PHARMA, Bâtiment CEI, 66 Bd Niels Bohr, BP 2132, 69603 Villeurbanne cedex, France
| | - Sothea Kim
- Université de Toulouse 3, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), F-31062 Toulouse cedex 9, France, IRD, UMR 152, F-31062 Toulouse cedex 9, France, and IDEALP-PHARMA, Bâtiment CEI, 66 Bd Niels Bohr, BP 2132, 69603 Villeurbanne cedex, France
| | - Jean-Pierre Nallet
- Université de Toulouse 3, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), F-31062 Toulouse cedex 9, France, IRD, UMR 152, F-31062 Toulouse cedex 9, France, and IDEALP-PHARMA, Bâtiment CEI, 66 Bd Niels Bohr, BP 2132, 69603 Villeurbanne cedex, France
| | - Françoise Nepveu
- Université de Toulouse 3, UPS, UMR 152 (Laboratoire de pharmacochimie des substances naturelles et pharmacophores redox), F-31062 Toulouse cedex 9, France, IRD, UMR 152, F-31062 Toulouse cedex 9, France, and IDEALP-PHARMA, Bâtiment CEI, 66 Bd Niels Bohr, BP 2132, 69603 Villeurbanne cedex, France
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