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Wang M, Chen R, Wang S, Cui J, Lian D, Li L. Comparative Study of Binding Behaviors of Cyanidin, Cyanidin-3-Galactoside, Peonidin with Tyrosinase. J Fluoresc 2024; 34:1747-1760. [PMID: 37603228 DOI: 10.1007/s10895-023-03384-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 08/06/2023] [Indexed: 08/22/2023]
Abstract
Cyanidin, peonidin and cyanidin-3-galactoside are the common anthocyanins with a variety of biological activities. Tyrosinase is a speed-limiting enzyme associated with melanin production. The inhibition of tyrosinase activity can prevent melanin disease while contributing to whitening. The interaction behaviors of the three anthocyanins against tyrosinase have been discussed in this paper. Cyanidin has strongest inhibitory effect on tyrosinase, and then peonidin, cyanidin-3-galactoside. Furthermore, the inhibition of tyrosinase by the three anthocyanins is mixed modes. The three anthocyanins can induce the static fluorescence quenching of tyrosinase. Cyanidin exhibits strongest binding affinity on tyrosinase, and then peonidin, cyanidin-3-galactoside based on Ka values obtain by fluorescence analysis. The binding of all anthocyanin to tyrosinase induce its conformation changes. According to molecular docking and fluorescence studies, they bind to tyrosinase by hydrogen bond and van der Waals force. In addition, the optimal modes of the three anthocyanins with tyrosinase are predicated by molecular docking. This work emphasizes that cyanidin, peonidin and cyanidin-3-galactoside may be potential drugs for the treatment of diseases caused by melanin.
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Affiliation(s)
- Meizi Wang
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China
| | - Rongda Chen
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China
- Zhaoqing Xuanqing Middle School, Zhaoqing, China
| | - Suqing Wang
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China
| | - Jingjing Cui
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China
| | - Di Lian
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China
| | - Li Li
- The College of Chemistry, Changchun Normal University, Changchun, 130032, China.
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2
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Chai WM, Bai Q, Pan Q, Wang L, Zhu D. 6,7-Bis-(2-methoxyethoxy)-4(3H)-quinazolinone as a novel inhibitor of tyrosinase and potential anti-browning agent of fresh-cut apples. J Biosci Bioeng 2024; 137:165-172. [PMID: 38212152 DOI: 10.1016/j.jbiosc.2023.12.006] [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: 08/30/2023] [Revised: 12/04/2023] [Accepted: 12/08/2023] [Indexed: 01/13/2024]
Abstract
6,7-Bis-(2-methoxyethoxy)-4(3H)-quinazolinone (BMEQ) was selected from quinazolinones for its strong tyrosinase inhibitory activity (IC50 = 160 ± 6 μM). It suppressed tyrosinase activity in a competitive way and quenched the fluorescence of the enzyme through a static mechanism. The binding of BMEQ to tyrosinase increased the hydrophobicity of the latter and facilitated non-radiative energy transfer between them. The formation of BMEQ-tyrosinase complex was driven by hydrogen bonds and hydrophobic interactions, and it loosened the basic framework structure of tyrosinase, affecting the conformation of the enzyme, and leading to a decrease in tyrosinase activity. In addition, the BMEQ postponed the oxidation of phenolics and flavonoids by inhibiting polyphenol oxidase (PPO) and peroxidase (POD), which resulted in the inhibition of the browning of fresh-cut apples. This study identified a novel tyrosinase inhibitor BMEQ and verified its potential application for improving the preservation of postharvest fruits.
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Affiliation(s)
- Wei-Ming Chai
- Jiangxi Key Laboratory of Organic Chemistry, Institute of Organic Functional Molecules, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China; College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Qiuhan Bai
- College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Qiuxia Pan
- College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Linjun Wang
- College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Du Zhu
- Jiangxi Key Laboratory of Organic Chemistry, Institute of Organic Functional Molecules, Jiangxi Science and Technology Normal University, Nanchang, Jiangxi 330013, China; College of Life Science, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
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3
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Min X, Lu L, Xu X, Wen Y, Zheng X. Investigation on the inhibition mechanism and binding behavior of paeonol to tyrosinase and its anti-browning property by multi-spectroscopic and molecular docking methods. Int J Biol Macromol 2023; 253:126962. [PMID: 37722636 DOI: 10.1016/j.ijbiomac.2023.126962] [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: 08/10/2023] [Revised: 09/12/2023] [Accepted: 09/15/2023] [Indexed: 09/20/2023]
Abstract
Paeonol, as one effective tyrosinase inhibitor, had been used as food preservative and clinical medication for skin disorders. In this study, the inhibition mechanism and binding behavior of paeonol to tyrosinase and its anti-browning property were investigated using multi-spectroscopic and molecular docking methods. Activity assay and kinetic results confirmed paeonol as a reversible mixed-type tyrosinase inhibitor. Results of the mechanistic studies were clarified using fluorescence quenching, synchronous fluorescence, CD spectra and 3D fluorescence, and showed that the binding of paeonol to tyrosinase might change the chromophore microenvironment and conformation of tyrosinase to inhibit enzyme catalytic activity. Molecular docking results revealed the detailed binding between paeonol and tyrosinase. Moreover, paeonol could prevent the browning of fresh-cut apples, as well as inhibiting PPO and POD activities and increasing APX activity. All above findings established a reliable basis for the inhibitory mechanism of paeonol against tyrosinase and therefore contributed to its application in anti-browning.
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Affiliation(s)
- Xiaofeng Min
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Li Lu
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China
| | - Xuetao Xu
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China.
| | - Yi Wen
- Department of Pharmacy, Zhongshan City People's Hospital, Zhongshan 825403, China.
| | - Xi Zheng
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China.
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4
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Li G, Zhao Y, Qin Z, Wei S, Liang D, Liang Y, Song W, Ding B. Mechanistic Understanding of Tyrosinase Inhibition by Polymeric Proanthocyanidins from Acacia confusa Stem Bark and Their Effect on the Browning Resistance of Fresh-Cut Asparagus Lettuce. Molecules 2023; 28:3435. [PMID: 37110667 PMCID: PMC10143530 DOI: 10.3390/molecules28083435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 04/05/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
Tyrosinase inhibitors are capable of preventing unfavorable enzymatic browning of fruits and vegetables. In this study, the capacity of Acacia confusa stem bark proanthocyanidins (ASBPs) to inhibit tyrosinase activity was evaluated. ASBPs were shown to be a high-potential inhibitor of tyrosinase with IC50 values of 92.49 ± 4.70 and 61.74 ± 8.93 μg/mL when using L-tyrosine and L-DOPA as the substrate, respectively. The structural elucidation performed with UV-vis, FT-IR spectroscopy, ESI-MS and thiolysis coupled to HPLC-ESI-MS suggested that ASBPs had structural heterogeneity in monomer units and interflavan linkages and consisted mainly of procyanidins dominant with B-type linkages. To gain insights into the inhibitory mechanisms of ASBPs against tyrosinase, different spectroscopic and molecular docking methods were further conducted. Results validated that ASBPs possessed the ability to chelate copper ions and could prevent the oxidation process of substrates by tyrosinase. The hydrogen bond formed with Lys-376 residue played a key role in the binding force of ASBPs with tyrosinase that induced a certain alteration in the microenvironment and secondary structure of tyrosinase, resulting in the enzymatic activity being ultimately restricted. It was also observed that ASBPs treatment effectively inhibited the activities of PPO and POD to retard the surface browning of fresh-cut asparagus lettuce and thus extended their shelf-life. The results provided preliminary evidence supporting the exploitation of ASBPs into potential antibrowning agents for the fresh-cut food industry.
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Affiliation(s)
- Guanghui Li
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Yaying Zhao
- College of Life Science, Yangtze University, Jingzhou 434025, China
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Zeya Qin
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Shudong Wei
- College of Life Science, Yangtze University, Jingzhou 434025, China
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Dandan Liang
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Yun Liang
- College of Life Science, Yangtze University, Jingzhou 434025, China
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Wei Song
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Baomiao Ding
- College of Life Science, Yangtze University, Jingzhou 434025, China
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Wen Y, Zhang Y, Zhang X, Wang L, Pan Q, Bai Q, Zhu D, Chai W. Inhibition of albendazole and 2-(2-aminophenyl)-1H-benzimidazole against tyrosinase: mechanism, structure-activity relationship, and anti-browning effect. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023; 103:2824-2837. [PMID: 36641547 DOI: 10.1002/jsfa.12450] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 01/09/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Tyrosinase is the key enzyme involved in enzymatic browning of plant-derived foods. Inhibition of tyrosinase activity contributes to the control of food browning. Due to safety regulations or other issues, most identified tyrosinase inhibitors are not suitable for practical use. Therefore, it is necessary to search for novel tyrosinase inhibitors. In this study, the anti-tyrosinase activity and mechanism of albendazole and 2-(2-aminophenyl)-1H-benzimidazole (2-2-A-1HB) were investigated through ultraviolet-visible absorption spectroscopy, fluorescence spectra, molecular docking, and molecular dynamic (MD) simulation. The anti-browning effect of albendazole on fresh-cut apples was then elucidated. RESULTS Albendazole and 2-2-A-1HB were both efficient tyrosinase inhibitors with IC50 of 51 ± 1.5 and 128 ± 1.3 μmol L-1 , respectively. Albendazole suppressed tyrosinase non-competitively and formed tyrosinase-albendazole complex statically. Hydrogen bond and hydrophobic interaction were major driving forces in stabilizing the tyrosinase-albendazole complex. While 2-2-A-1HB inhibited the enzyme competitively and quenched its intrinsic fluorescence through a static mechanism, it generated strong binding affinity with tyrosinase through hydrophobic interaction. MD simulations further validated that albendazole/2-2-A-1HB could form stable complexes with tyrosinase and loosened its basic framework structure, leading to a change in secondary structure and conformation. In addition, albendazole could delay the browning of fresh-cut apples by inhibiting the activity of polyphenol oxidase, peroxidase and phenylalanine ammonia-lyase, and reducing the oxidation of phenolic compounds. CONCLUSION This research might provide a deep view of tyrosinase inhibition by benzimidazole derivatives and a theoretical basis for developing albendazole as a potential fresh-keeping agent. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Yiting Wen
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Yujia Zhang
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Xiaoli Zhang
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Linjun Wang
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Qiuxia Pan
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Qiuhan Bai
- College of Life Science, Jiangxi Normal University, Nanchang, China
| | - Du Zhu
- College of Life Science, Jiangxi Normal University, Nanchang, China
- Jiangxi Key Laboratory of Organic Chemistry, Institute of Organic Functional Molecules, Jiangxi Science and Technology Normal University, Nanchang, China
| | - Weiming Chai
- College of Life Science, Jiangxi Normal University, Nanchang, China
- Jiangxi Key Laboratory of Organic Chemistry, Institute of Organic Functional Molecules, Jiangxi Science and Technology Normal University, Nanchang, China
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Gallic acid functionalized chitosan immobilized nanosilver for modified chitosan/Poly (vinyl alcohol) composite film. Int J Biol Macromol 2022; 222:2987-3000. [DOI: 10.1016/j.ijbiomac.2022.10.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/18/2022] [Accepted: 10/09/2022] [Indexed: 11/05/2022]
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7
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Lin LY, Liao YL, Chen MH, Chang SF, Chen KC, Peng RY. Molecular Action Mechanism of Coixol from Soft-Shelled Adlay on Tyrosinase: The Future of Cosmetics. Molecules 2022; 27:4626. [PMID: 35889498 PMCID: PMC9325028 DOI: 10.3390/molecules27144626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 07/02/2022] [Accepted: 07/05/2022] [Indexed: 11/16/2022] Open
Abstract
Coix lacryma-jobi var. ma-yuen L. Gramineae is widely cultivated in Taiwan. Literature regarding the molecular action mechanism of coixol on tyrosinase and the application of coicis seed extracts to the processing of facial masks is still lacking. Solvent extractability analysis revealed that most of the polyphenolics in coicis seeds were water soluble (3.17 ± 0.12 to 3.63 ± 0.07 μg/mLGAE). In contrast, the methanolic extract contained the most flavonoids (0.06 ± 0.00~0.26 ± 0.03 μg/mL QE) and coixol (11.43 ± 0.13~12.83 ± 0.14 μg/mL), showing potent antioxidant capability. Additionally, the contents of coixenolide (176.77 ± 5.91 to 238.60 ± 0.21 μg/g), phytosterol (52.45 ± 2.05 to 58.23 ± 1.14 mg/g), and polysaccharides (3.42 ± 0.10 to 4.41 ± 0.10 mg/g) were rather high. The aqueous extract (10 μg/mL) and the ethanolic extract (1 mg/mL) showed no cytotoxicity to B16F10 melanocytes. More attractively, the ethanolic extract at 1 mg/mL caused 48.4% inhibition of tyrosinase activity in B16F10 melanocytes, and 50.7% on human tyrosinase (hTyr) fragment 369-377. Conclusively, the coicis seed extracts containing abundant nutraceuticals with promising anti-hTyr activity and moisturizing capability can serve as good ingredients for facial mask processing.
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Affiliation(s)
- Li-Yun Lin
- Department of Food and Applied Technology, Hungkuang University, No. 1018, Sec. 6, Taiwan Boulevard, Shalu District, Taichung City 43302, Taiwan; (L.-Y.L.); (S.-F.C.)
| | - Yi-Lun Liao
- Taiwan Seed Improvement and Propagation Station, COA. No. 6, Xingzhong St., Xinshe District, Taichung City 426017, Taiwan;
| | - Min-Hung Chen
- Agriculture & Food Agency Council of Agriculture, Executive Yuan, Marketing and Processing Division, Taichung City 43302, Taiwan;
| | - Shih-Feng Chang
- Department of Food and Applied Technology, Hungkuang University, No. 1018, Sec. 6, Taiwan Boulevard, Shalu District, Taichung City 43302, Taiwan; (L.-Y.L.); (S.-F.C.)
| | - Kuan-Chou Chen
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, No. 250, Wu-Xin St., Taipei 11031, Taiwan;
- Department of Urology, Taipei Medical University Shuang-Ho Hospital, 250, Wu-Xin St., Xin-Yi District, Taipei 11031, Taiwan
| | - Robert Y. Peng
- Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, No. 250, Wu-Xin St., Taipei 11031, Taiwan;
- School of Medicine and Nursing, Hungkuang University, No. 1018, Sec. 6, Taiwan Boulevard, Shalu District, Taichung City 43302, Taiwan
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8
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Çiğdem A, Güller U. Purification and characterization of catechol oxidase from Posof Badele apple ( Malus domestica L): in vitro and in silico studies. INTERNATIONAL JOURNAL OF FOOD ENGINEERING 2022. [DOI: 10.1515/ijfe-2022-0022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In the current study, polyphenol oxidase (PPO), responsible for enzymatic browning in fruits, was purified from Posof Badele apple (PB) (Malus domestica L.) in two steps as acetone precipitation and affinity chromatography. After purification, the purity of PBPPO was checked by using SDS-PAGE. It was figured out that PBPPO had maximum activity at pH 6.0 and 10 °C and it was stable at pH 5.5 and temperatures of 0–30 °C. Besides, it was determined that Al3+ and Cu2+ metal ions activated the enzyme and the PBPPO was strongly inhibited by ascorbic acid with a Ki constant of 1.67 ± 0.35 µM. Inhibitor-enzyme interactions were examined by molecular docking studies and it was revealed that ascorbic acid had the lowest docking score of −6.54 kcal/mol. We wanted to draw attention to the PB apple, which is red inside as well as outside and very rich in terms of nutrient content.
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Affiliation(s)
- Ayhan Çiğdem
- Department of Food Engineering , Faculty of Engineering, Iğdır University , Iğdır , Turkey
| | - Uğur Güller
- Department of Food Engineering , Faculty of Engineering, Iğdır University , Iğdır , Turkey
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Huang GL, Liu TT, Ma JJ, Sun LX, Sui SY, Quan XY, Wang YN. Anti-polyphenol oxidase mechanism of oligomeric procyanidins and its application on browning control of “Baiyu” loquat during storage. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Yu ZY, Xu K, Wang X, Wen YT, Wang LJ, Huang DQ, Chen XX, Chai WM. Punicalagin as a novel tyrosinase and melanin inhibitor: Inhibitory activity and mechanism. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113318] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Fan X. Chemical inhibition of polyphenol oxidase and cut surface browning of fresh-cut apples. Crit Rev Food Sci Nutr 2022; 63:8737-8751. [PMID: 35416745 DOI: 10.1080/10408398.2022.2061413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Fresh-cut apples, which offer consumers health benefits and convenience, have become popular in recent years. One of the main challenges for processing fresh-cut apples is rapid development of cut surface browning, immediately after fruits are cut. Browning, a physiological response that impacts organoleptic properties and deters consumer purchase of fresh-cut fresh produce, is mainly a result of enzymatic reaction of phenolic compounds with oxygen catalyzed by polyphenol oxidase (PPO), a decapper enzyme. Many antibrowning agents have been developed and evaluated to inhibit PPO activities by using reducing agents (antioxidants), chelating agents, acidulants, etc. The present manuscript reviews the diverse characteristics of PPO (such as optimum pH and temperature, and molecular weight) in apples reported in the literature and the enzyme's latency, multiplicity and copper states in the active site. It also summarizes the latest development in the investigation and formulations of antibrowning compounds, and discusses future research needs. This review should stimulate further research to discover more effective, low cost, and natural antibrowning compounds to meet the demand of consumers as well as the food industry for clean label and long shelf-life of fresh-cut apples.
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Affiliation(s)
- Xuetong Fan
- U.S. Department of Agriculture, Agricultural Research Service, Eastern Regional Research Center, PA, USA
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12
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Hu ZZ, Ma TX, Sha XM, Zhang L, Tu ZC. Improving tyrosinase inhibitory activity of grass carp fish scale gelatin hydrolysate by gastrointestinal digestion: Purification, identification and action mechanism. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113205] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Yin ZH, Li YF, Gan HX, Feng N, Han YP, Li LM. Synergistic effects and antityrosinase mechanism of four plant polyphenols from Morus and Hulless Barley. Food Chem 2021; 374:131716. [PMID: 34875434 DOI: 10.1016/j.foodchem.2021.131716] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 11/04/2021] [Accepted: 11/27/2021] [Indexed: 11/15/2022]
Abstract
Sanggenone C, oxyresveratrol, catechin and l-epicatechin exist in Morus and Hulless Barley as natural polyphenols with antityrosinase activity. Little research on their synergistic and structure-function relationships of them has been reported in recent years. In this paper, the inhibition mechanisms of these four plant polyphenols were investigated by enzyme kinetics, HPLC, fluorescence spectra, and molecular docking methods. The results showed that oxyresveratrol (IC50 = 1.096 ± 0.048 μg/mL), sanggenone C (IC50 = 13.360 ± 1.029 μg/mL), l-epicatechin (IC50 = 55.730 ± 1.762 μg/mL), and catechin (IC50 = 148.500 ± 3.355 μg/mL) exhibited tyrosinase inhibition activity. When sangenone C (14 μg/mL) was mixed with l-epicatechin (56 μg/mL) at 4:1 (40 μL + 10 μL), the highest tyrosinase inhibition was achieved. Molecular docking showed that the number and position of phenolic hydroxyls of polyphenols were the key for tyrosinase inhibition activity. This study provided new ideas for the application of these four plant polyphenols from Hulless Barley and Morus as tyrosinase inhibitors in food preservation.
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Affiliation(s)
- Zheng-Hao Yin
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China
| | - Yuan-Fei Li
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China
| | - Hong-Xia Gan
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China
| | - Nan Feng
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China
| | - Yong-Ping Han
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China.
| | - Li-Mei Li
- College of Pharmacy, Institute of Ethnomedicine, Southwest Minzu University, Chengdu 610041, China.
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14
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The Effect of Lactiplantibacillus plantarum BX62 Alone or in Combination with Chitosan on the Qualitative Characteristics of Fresh-Cut Apples during Cold Storage. Microorganisms 2021; 9:microorganisms9112404. [PMID: 34835529 PMCID: PMC8618497 DOI: 10.3390/microorganisms9112404] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 11/17/2021] [Accepted: 11/20/2021] [Indexed: 12/11/2022] Open
Abstract
In order to explore whether beneficial lactic acid bacteria (LAB) could prolong the shelf life and improve the quality of fresh-cut apples, Lactiplantibacillus plantarum BX62, which was isolated from traditional fermented yak yogurt, and chitosan (CT), were applied to fresh-cut apples, subsequently stored at 4 °C. On days 0, 2, 4, 6, and 8, apple slices were taken for physicochemical, microbiological analysis, and sensory evaluation. The results showed that apple slices coated with L. plantarum BX62 (8 log CFU/mL) presented lower weight loss and browning rate, higher DPPH scavenging capacity, and achieved more effective inhibition of polyphenol oxidase (PPO) and peroxidase (POD) activities compared to the control samples. The application of CT alone or in combination with L. plantarum BX62 resulted in a significant reduction in aerobic mesophilic bacteria (AMB), aerobic psychrophilic bacterial (APB), yeast and molds (YAMs) counts (2.31 log CFU/g for AMB, 2.55 for APB, and 1.58 for YAMs). In addition, L. plantarum BX62 coated apples showed acceptable sensory properties in terms of color, flavor, taste, texture, and overall visual quality during 8 d of storage. On this basis, L. plantarum BX62 could be used as an excellent bio-preservative to extend the shelf life and improve the quality of fresh-cut apples.
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15
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Omeprazole inhibits α-glucosidase activity and the formation of nonenzymatic glycation products: Activity and mechanism. J Biosci Bioeng 2021; 133:110-118. [PMID: 34802943 DOI: 10.1016/j.jbiosc.2021.10.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/30/2021] [Accepted: 10/20/2021] [Indexed: 11/22/2022]
Abstract
In this study, the inhibitory effect and mechanism of omeprazole on α-glucosidase and nonenzymatic glycation were investigated in vitro by using multi-spectroscopic methods and molecular docking. Enzyme kinetic results showed that omeprazole inhibited α-glucosidase in a reversible and noncompetitive manner (IC50= 0.595 ± 0.003 mM). The results from fluorescence quenching and thermomechanical analyses signified that omeprazole reduced the fluorescence intensity of α-glucosidase by forming an omeprazole-α-glucosidase complex primarily driven by hydrogen bonds. Molecular docking further confirmed that hydrogen bonds and hydrophobic forces were the major driving forces for omeprazole binding to α-glucosidase. The nonenzymatic glycation assays revealed that omeprazole had a moderate inhibition against the formation of fructosamine, dicarbonyl compounds, and advanced glycation end products (AGEs). This study provides a new inhibitor of both α-glucosidase and nonenzymatic glycation and provides a practicable candidate for treating diabetes and its complications.
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Wen YT, Liang YQ, Chai WM, Wei QM, Yu ZY, Wang LJ. Effect of ascorbic acid on tyrosinase and its anti-browning activity in fresh-cut Fuji apple. J Food Biochem 2021; 45:e13995. [PMID: 34730855 DOI: 10.1111/jfbc.13995] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/22/2021] [Accepted: 10/10/2021] [Indexed: 11/28/2022]
Abstract
Tyrosinase (polyphenol oxidase) is the key enzyme of enzymatic browning in fruits and vegetables. In this research, the impact of ascorbic acid on tyrosinase and its anti-browning effect on fresh-cut Fuji apple were investigated. Ascorbic acid had a dual effect on tyrosinase with a half inhibitory concentration (IC50 ) of 13.40 ± 0.05 µM. Fluorescence assay demonstrated that ascorbic acid interacted with tyrosinase in a dynamic contaction caused by Förster's resonance energy transfer (FRET) and induced a conformational change of the enzyme. Thermodynamic analysis, copper interaction, and molecular docking further confirmed that ascorbic acid could chelate the copper ions located in active center and interact with amino acid residues of tyrosinase via hydrophobic interaction. In addition, ascorbic acid prevented the browning of fresh-cut apples by increasing APX activity and inhibiting PPO and POD activities which reduce the oxidation of total phenolics and flavonoids. PRACTICAL APPLICATIONS: The present study demonstrated that ascorbic acid had a strong inhibitory activity against tyrosinase (IC50 = 13.40 ± 0.05 µM) and anti-browning activity against fresh-cut Fuji apple. It could delay the browning degree of apple juice, increase APX activity, inhibit PPO and POD activities, and reduce the oxidation of total phenolics and flavonoids. These findings provided a basis for the feasible application of ascorbic acid on the preservation of fruits.
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Affiliation(s)
- Yi-Ting Wen
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Yu-Qin Liang
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Wei-Ming Chai
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Qi-Ming Wei
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Zi-Yi Yu
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Lin-Jun Wang
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
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17
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Ding N, Xu H, Zong S, Gong Y, Hao Y, Tang X, Li Z. Detection of Tyrosinase in Real Food Samples and Living Cells by a Novel Near-Infrared Fluorescence Probe. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:1994-2000. [PMID: 33529018 DOI: 10.1021/acs.jafc.0c07882] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A new near-infrared fluorescence probe was developed and applied to the fluorescence detection of tyrosinase in real food samples and living cells. The probe (E)-2-(2-(6-((3-hydroxybenzyloxy)carbonylamino)-2,3-dihydro-1H-xanthen-4-yl)vinyl)-3,3-dimethyl-1-propyl-3H-indolium (1) was designed and synthesized by coupling 3-hydroxybenzyl alcohol via carbamate bond with an amino hemicyanine skeleton, based on the high anti-interference ability of 3-hydroxybenzyl alcohol to reactive oxygen species and its binding affinity to tyrosinase. Compared with the existing tyrosinase probes, the proposed probe exhibits superior analytical performance, such as high selectivity, high sensitivity, superior spatiotemporal sampling ability, fluorescence signal switching at 706 nm, and low detection limit of 0.36 U mL-1. More importantly, the probe has been successfully used to monitor tyrosinase in the browning of apple slices for the first time, and the results indicated that the strongest fluorescence intensity could be achieved at 2.5 h to realize precise visual recognition of tyrosinase. Notably, the probe determined tyrosinase in real food samples (apple, banana, cheese, and red wine) with a stable average recovery range of 95.7-108.3% and has been successfully used to monitor tyrosinase in the living B16 cells. The superior properties of the probe make it of great potential use in food nutritional value evaluation and clinical diagnosis of melanin-related diseases.
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Affiliation(s)
- Ning Ding
- Department of Ophthalmology, The First Hospital of Jilin University, Changchun 130021, China
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, and Shaanxi Key Laboratory for Hazard Factors Assessment in Processing and Storage of Agricultural Products, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Hui Xu
- Department of Ophthalmology, The First Hospital of Jilin University, Changchun 130021, China
| | - Shan Zong
- Department of Gynecologic Oncology, The First Hospital of Jilin University, Changchun 130021, China
| | - Yubao Gong
- Department of Orthopedics, The First Hospital of Jilin University, Changchun 130021, China
| | - Yitong Hao
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, and Shaanxi Key Laboratory for Hazard Factors Assessment in Processing and Storage of Agricultural Products, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Xiaojie Tang
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, and Shaanxi Key Laboratory for Hazard Factors Assessment in Processing and Storage of Agricultural Products, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
| | - Zhao Li
- Shaanxi Engineering Laboratory for Food Green Processing and Safety Control, and Shaanxi Key Laboratory for Hazard Factors Assessment in Processing and Storage of Agricultural Products, College of Food Engineering and Nutritional Science, Shaanxi Normal University, Xi'an 710062, China
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18
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Chai WM, Yu ZY, Lin MZ, Wei QM, Song S. 5-Methoxy-2-mercaptobenzimidazole as an efficient inhibitor on tyrosinase: Inhibitory activity and mechanism. J Biosci Bioeng 2020; 131:356-363. [PMID: 33388257 DOI: 10.1016/j.jbiosc.2020.11.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 11/24/2020] [Accepted: 11/25/2020] [Indexed: 11/29/2022]
Abstract
In this study, 5-methoxy-2-mercaptobenzimidazole (5-M-2-MB) was confirmed as an efficient tyrosinase inhibitor by methods of enzyme kinetic, fluorescence quenching, ANS-binding, thermodynamics, energy transfer, and molecular docking in combination. The results proved that 5-M-2-MB significantly inhibited the tyrosinase (IC50 = 60 ± 2 nM) in a reversible and competitive way with the Ki value of 80 ± 1 nM. It quenched the intrinsic fluorescence of tyrosinase through a static mechanism, and caused conformational change of the enzyme by increasing the hydrophobic region. Moreover, this compound could bind to tyrosinase and form 5-M-2-MB-tyrosinase complex by hydrogen bond and hydrophobic interaction. The interactions were generated between 5-M-2-MB and specific amino acid residues (Trp-358, Thr-308, Glu-356, and Asp-357) located on the A chain of tyrosinase. Therefore, this study would offer a theoretical foundation for developing the new tyrosinase inhibitor.
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Affiliation(s)
- Wei-Ming Chai
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
| | - Zi-Yi Yu
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Mei-Zhen Lin
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Qi-Ming Wei
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Shuang Song
- College of Life Science and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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Inhibitory Activity of Quercetin 3- O-Arabinofuranoside and 2-Oxopomolic Acid Derived from Malus domestica on Soluble Epoxide Hydrolase. Molecules 2020; 25:molecules25184352. [PMID: 32972033 PMCID: PMC7576482 DOI: 10.3390/molecules25184352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 09/19/2020] [Accepted: 09/21/2020] [Indexed: 11/17/2022] Open
Abstract
Flavonoids and triterpenoids were revealed to be the potential inhibitors on soluble epoxide hydrolase (sEH). The aim of this study is to reveal sEH inhibitors from Fuji apples. A flavonoid and three triterpenoids derived from the fruit of Malus domestica were identified as quercetin-3-O-arabinoside (1), ursolic acid (2), corosolic acid (3), and 2-oxopomolic acid (4). They had half-maximal inhibitory concentration of the inhibitors (IC50) values of 39.3 ± 3.4, 84.5 ± 9.5, 51.3 ± 4.9, and 11.4 ± 2.7 μM, respectively, on sEH. The inhibitors bound to allosteric sites of enzymes in mixed (1) and noncompetitive modes (2–4). Molecular simulations were carried out for inhibitors 1 and 4 to calculate the binding force of ligands to receptors. The inhibitors bound to the left (1) and right (4) pockets next to the enzyme’s active site. Based on analyses of their molecular docking and dynamics, it was shown that inhibitors 1 and 4 can stably bind sEH at 1 bar and 300 K. Finally, inhibitors 1 and 4 are promising candidates for further studies using cell-based assays and in vivo cardiovascular tests.
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20
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Binding of omeprazole to protein targets identified by monoclonal antibodies. PLoS One 2020; 15:e0239464. [PMID: 32946534 PMCID: PMC7500594 DOI: 10.1371/journal.pone.0239464] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 09/08/2020] [Indexed: 02/07/2023] Open
Abstract
Omeprazole is the most commonly used proton pump inhibitor (PPI), a class of medications whose therapeutic mechanism of action involves formation of a disulfide linkage to cysteine residues in the H+/K+ ATPase pump on gastric secretory cells. Covalent linkage between the sole sulfur group of omeprazole and selected cysteine residues of the pump protein results in inhibition of acid secretion in the stomach, an effect that ameliorates gastroesophageal reflux and peptic ulcer disease. PPIs, though useful for specific conditions when used transiently, are associated with diverse untoward effects when used long term. The mechanisms underlying these potential off-target effects remain unclear. PPIs may, in fact, interact with non-canonical target proteins (non-pump molecules) resulting in unexpected pathophysiological effects, but few studies describe off-target PPI binding. Here, we describe successful cloning of monoclonal antibodies against protein-bound omeprazole. We developed and used monoclonal antibodies to characterize the protein target range of omeprazole, stability of omeprazole-bound proteins, and the involvement of cysteines in binding of omeprazole to targets. We demonstrate that a wide range of diverse proteins are targeted by omeprazole. Protein complexes, detected by Western blotting, are resistant to heat, detergents, and reducing agents. Reaction of omeprazole occurs with cysteine-free proteins, is not fully inhibited by cysteine alkylation, occurs at neutral pH, and induces protein multimerization. At least two other clinically used PPIs, rabeprazole and tenatoprazole, are capable of binding to proteins in a similar fashion. We conclude that omeprazole binds to multiple proteins and is capable of forming highly stable complexes that are not dependent on disulfide linkages between the drug and protein targets. Further studies made possible by these antibodies may shed light on whether PPI-protein complexes underlie off-target untoward effects of chronic PPI use.
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21
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Effect of 4-hexylresorcinol on post-cut browning and quality of minimally processed ‘Fuji’ apple fruits. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2020. [DOI: 10.1007/s11694-020-00494-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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22
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Ou-Yang C, Chai W, Xu X, Song S, Wei Q, Huang Q, Zou Z. Inhibitory potential of proanthocyanidins from the fruit pulp of Clausena lansium (Lour.) Skeels against α-glucosidase and non-enzymatic glycation: Activity and mechanism. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.01.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Chen J, Ye Y, Ran M, Li Q, Ruan Z, Jin N. Inhibition of Tyrosinase by Mercury Chloride: Spectroscopic and Docking Studies. Front Pharmacol 2020; 11:81. [PMID: 32210794 PMCID: PMC7068222 DOI: 10.3389/fphar.2020.00081] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 01/27/2020] [Indexed: 11/13/2022] Open
Abstract
Inorganic mercury compounds have been used in skin-lightening products since ancient times. Although a previous study demonstrated that mercury impeded the transfer of Cu2+ to the apotyrosinase, the effect of mercury on tyrosinase is still unclear. In the present study, the mechanism of mercury chloride (HgCl2) induced inactivation of tyrosinase was investigated for the first time. The IC50 values were 29.97 and 77.93 μmol/L for monophenolase and diphenolase, respectively. A kinetic analysis revealed that HgCl2 inhibited tyrosinase activity in an irreversible non-competitive manner. The strong intrinsic fluorescence quenching suggested that the formation of the HgCl2-tyrosinase complex induced conformational changes of the enzyme, and HgCl2 had only one single binding site or a single class of binding site on tyrosinase. The molecular docking and further experiments demonstrated that HgCl2 bound to the amino residuals (His) in the catalytic center of tyrosinase. To our knowledge, these findings presented in this paper were the first evidence of the direct interactions between HgCl2 and tyrosinase, which provided a deep understanding of the inhibition mechanism of mercury on tyrosinase.
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Affiliation(s)
- Jianmin Chen
- School of Pharmacy and Medical Technology, Putian University, Fujian, China.,Key Laboratory of Pharmaceutical Analysis and Laboratory Medicine, Putian University, Fujian Province University, Fujian, China
| | - Yaling Ye
- School of Pharmacy and Medical Technology, Putian University, Fujian, China
| | - Mengnan Ran
- School of Pharmacy and Medical Technology, Putian University, Fujian, China
| | - Qinglian Li
- School of Pharmacy and Medical Technology, Putian University, Fujian, China
| | - Zhipeng Ruan
- School of Pharmacy and Medical Technology, Putian University, Fujian, China.,Key Laboratory of Pharmaceutical Analysis and Laboratory Medicine, Putian University, Fujian Province University, Fujian, China
| | - Nan Jin
- School of Pharmacy and Medical Technology, Putian University, Fujian, China.,Key Laboratory of Pharmaceutical Analysis and Laboratory Medicine, Putian University, Fujian Province University, Fujian, China
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24
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Zhao Z, Liu G, Meng Y, Tian J, Chen X, Shen M, Li Y, Li B, Gao C, Wu S, Li C, He X, Jiang R, Qian M, Zheng X. Synthesis and anti-tyrosinase mechanism of the substituted vanillyl cinnamate analogues. Bioorg Chem 2019; 93:103316. [DOI: 10.1016/j.bioorg.2019.103316] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 08/29/2019] [Accepted: 09/25/2019] [Indexed: 12/21/2022]
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25
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Dong X, Wang S, Xu L, Lin J, Xu X. Inhibitory mechanism of Penicillin V on mushroom tyrosinase. Mol Biol Rep 2019; 47:967-975. [PMID: 31749120 DOI: 10.1007/s11033-019-05188-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 11/09/2019] [Indexed: 12/31/2022]
Abstract
Penicillin V is a bacteriolytic β-lactam antibiotic drug. In the present work, we investigated the inhibitory effect of Penicillin V on the activity of mushroom tyrosinase for the first time. The molecular mechanism for the inhibition of tyrosinase by Penicillin V was investigated by means of kinetics analysis, fluorescence quenching and molecular docking techniques. The results showed that Penicillin V could inhibit both monophenolase and diphenolase activities with IC50 of 16.6 ± 0.5 and 11.0 ± 0.2 mmol/L, respectively. The inhibitory type of Penicillin V on mushroom was mixed type, and the values of KI and KIS were 13.46 and 17.26 mmol/L, respectively. The fluorescence quenching and molecular docking showed that Penicillin V could form static interaction near the catalytic pocket of the enzyme to hinder the transportation of substrate to the active site, as well as reduce the copper plasticity for catalysis. Our results contributed to the usage of Penicillin V as a novel tyrosinase inhibitor with dual effect in field of antimicrobial and food preservation and could also provide guidance for the design of novel tyrosinase inhibitors.
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Affiliation(s)
- Xin Dong
- Tuolong Biotechnological Developmental Ltd Co., Guangzhou, 510800, China
| | - Shaoyu Wang
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350116, China
| | - Lian Xu
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350116, China
| | - Juan Lin
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350116, China.
| | - Xinqi Xu
- College of Biological Science and Engineering, Fuzhou University, Fuzhou, 350116, China.
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26
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Chai W, Ou-Yang C, Ma Z, Song S, Huang Q, Wei Q, Peng Y. Anti-α-glucosidase and antityrosinase activity of condensed tannins from the bark of Clausena lansium (Lour.) Skeels with antiproliferative and apoptotic properties in B16 mouse melanoma cells. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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27
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Huang Q, Chai WM, Ma ZY, Deng WL, Wei QM, Song S, Zou ZR, Peng YY. Antityrosinase mechanism of ellagic acid in vitro and its effect on mouse melanoma cells. J Food Biochem 2019; 43:e12996. [PMID: 31659813 DOI: 10.1111/jfbc.12996] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2019] [Revised: 06/30/2019] [Accepted: 07/08/2019] [Indexed: 11/27/2022]
Abstract
The activities of ellagic acid in inhibiting mushroom tyrosinase and cell proliferation were evaluated in this research. The results of enzyme kinetics indicated that ellagic acid could effectively inhibit tyrosinase activity. The value of the semi-inhibitory rate (IC50 ) was 0.2 ± 0.05 mM. Ellagic acid inhibited tyrosinase activity in a reversible manner and was a mixed tyrosinase inhibitor. Furthermore, ellagic acid had a good inhibitory effect on the proliferation of mouse melanoma B16 cells and could induce apoptosis. The results acquired from fluorescence spectroscopy revealed that the interaction of ellagic acid with tyrosinase depended on hydrogen bond and electrostatic force. In addition, computational docking showed that ellagic acid interacted with amino acid residues of tyrosinase (Asn19 and Lys372) by hydrogen bond and produced electrostatic interaction with amino residue Lys18. PRACTICAL APPLICATIONS: In the present research, the antityrosinase mechanism of ellagic acid and its effect on mouse melanoma cells were investigated. This study suggested that ellagic acid had a strong inhibitory activity against tyrosinase and cell proliferation,which laid an experimental foundation for the development of new drugs and whitening products. The combined multispectral methods used in this research can be applied to the screening of other antityrosinase inhibitors, further promoting the development and utilization of tyrosinase inhibitors.
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Affiliation(s)
- Qian Huang
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Wei-Ming Chai
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Zuo-Yuan Ma
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Wei-Liang Deng
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Qi-Ming Wei
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Shuang Song
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Zheng-Rong Zou
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
| | - Yi-Yuan Peng
- College of Life Science, and Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University, Nanchang, China
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28
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Lin MZ, Chai WM, Zheng YL, Huang Q, Ou-Yang C. Inhibitory kinetics and mechanism of rifampicin on α-glucosidase: Insights from spectroscopic and molecular docking analyses. Int J Biol Macromol 2018; 122:1244-1252. [PMID: 30227201 DOI: 10.1016/j.ijbiomac.2018.09.077] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Revised: 09/08/2018] [Accepted: 09/13/2018] [Indexed: 01/12/2023]
Abstract
α-Glucosidase is a critical enzyme associated with diabetes mellitus, and the inhibitors of the enzyme play important roles in the treatment of the disease. In this study, the inhibitory effect and mechanism of rifampicin on α-glucosidase were investigated by multispectroscopic methods along with molecular docking technique. The results showed that rifampicin inhibited α-glucosidase activity prominently (IC50 = 135 ± 1.2 μM) in a reversible and competitive-type manner. The fluorescence intensity of α-glucosidase was quenched by rifampicin through forming rifampicin-α-glucosidase complex in a static procedure. And the formation of the rifampicin-α-glucosidase complex was driven spontaneously by hydrophobic forces and hydrogen bonds. The results obtained from molecular docking further indicated that hydrophobic forces were formed between rifampicin and amino acid residues Phe 173, Pro151, and hydrogen bonds were generated by the interactions of rifampicin with residues Ser 180, Asn 414, Gly160, and Gly161 of α-glucosidase. Moreover, it was found that the binding of rifampicin to α-glucosidase could alter the conformation of the enzyme to make it steady, and the binding distance was estimated to be 1.02 nm. Therefore, this study confirmed a novel α-glucosidase inhibitor and possibly contributed to the improvement of newfangled anti-diabetic agent.
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Affiliation(s)
- Mei-Zhen Lin
- College of Life Science and Key Laboratory of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Wei-Ming Chai
- College of Life Science and Key Laboratory of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China.
| | - Yun-Ling Zheng
- College of Life Science and Key Laboratory of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Qian Huang
- College of Life Science and Key Laboratory of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Chong Ou-Yang
- College of Life Science and Key Laboratory of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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