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Zolghadri S, Saboury AA. Catalytic mechanism of tyrosinases. Enzymes 2024; 56:31-54. [PMID: 39304290 DOI: 10.1016/bs.enz.2024.05.001] [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] [Indexed: 09/22/2024]
Abstract
Tyrosinases (TYR) play a key role in melanin biosynthesis by catalyzing two reactions: monophenolase and diphenolase activities. Despite low amino acid sequence homology, TYRs from various organisms (from bacteria to humans) have similar active site architectures and catalytic mechanisms. The active site of the TYRs contains two copper ions coordinated by histidine (His) residues. The catalytic mechanism of TYRs involves electron transfer between copper sites, leading to the hydroxylation of monophenolic compounds to diphenols and the subsequent oxidation of these to corresponding dopaquinones. Although extensive studies have been conducted on the structure, catalytic mechanism, and enzymatic capabilities of TYRs, some mechanistic aspects are still debated. This chapter will delve into the structure of the active site, catalytic function, and inhibition mechanism of TYRs. The goal is to improve our understanding of the molecular mechanisms underlying TYR activity. This knowledge can help in developing new strategies to modulate TYR function and potentially treat diseases linked to melanin dysregulation.
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Affiliation(s)
- Samaneh Zolghadri
- Department of Biology, Jahrom Branch, Islamic Azad University, Jahrom, Iran.
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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2
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Zolghadri S, Beygi M, Mohammad TF, Alijanianzadeh M, Pillaiyar T, Garcia-Molina P, Garcia-Canovas F, Luis Munoz-Munoz J, Akbar Saboury A. Targeting Tyrosinase in Hyperpigmentation: Current Status, Limitations and Future Promises. Biochem Pharmacol 2023; 212:115574. [PMID: 37127249 DOI: 10.1016/j.bcp.2023.115574] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Revised: 04/21/2023] [Accepted: 04/24/2023] [Indexed: 05/03/2023]
Abstract
Hyperpigmentation is a common and distressing dermatologic condition. Since tyrosinase (TYR) plays an essential role in melanogenesis, its inhibition is considered a logical approach along with other therapeutic methods to prevent the accumulation of melanin in the skin. Thus, TYR inhibitors are a tempting target as the medicinal and cosmetic active agents of hyperpigmentation disorder. Among TYR inhibitors, hydroquinone is a traditional lightening agent that is commonly used in clinical practice. However, despite good efficacy, prolonged use of hydroquinone is associated with side effects. To overcome these shortcomings, new approaches in targeting TYR and treating hyperpigmentation are desperately requiredessentialneeded. In line with this purpose, several non-hydroquinone lightening agents have been developed and suggested as hydroquinone alternatives. In addition to traditional approaches, nanomedicine and nanotheranostic platforms have been recently proposed in the treatment of hyperpigmentation. In this review, we discuss the available strategies for the management of hyperpigmentation with a focus on TYR inhibition. In addition, alternative treatment options to hydroquinone are discussed. Finally, we present nano-based strategies to improve the therapeutic effect of drugs prescribed to patients with skin disorders.
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Affiliation(s)
- Samaneh Zolghadri
- Department of Biology, Jahrom Branch, Islamic Azad University, Jahrom, Iran.
| | - Mohammad Beygi
- Department of Agricultural Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | | | - Mahdi Alijanianzadeh
- Department of Cell & Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Thanigaimalai Pillaiyar
- Institute of Pharmacy, Pharmaceutical/Medicinal Chemistry and Tuebingen Center for Academic Drug Discovery, Eberhard Karls University Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany
| | - Pablo Garcia-Molina
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, Espinardo, Murcia, Spain
| | - Francisco Garcia-Canovas
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, Espinardo, Murcia, Spain
| | - Jose Luis Munoz-Munoz
- Microbial Enzymology Lab, Department of Applied Sciences, Ellison Building A, University of Northumbria, Newcastle Upon Tyne, UK
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
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3
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Sathya R, Valan Arasu M, Ilavenil S, Rejiniemon T, Vijayaraghavan P. Cosmeceutical potentials of litchi fruit and its by-products for a sustainable revalorization. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2023. [DOI: 10.1016/j.bcab.2023.102683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
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Bounegru AV, Apetrei C. Tyrosinase Immobilization Strategies for the Development of Electrochemical Biosensors-A Review. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:760. [PMID: 36839128 PMCID: PMC9962745 DOI: 10.3390/nano13040760] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/11/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
The development of enzyme biosensors has successfully overcome various challenges such as enzyme instability, loss of enzyme activity or long response time. In the electroanalytical field, tyrosinase is used to develop biosensors that exploit its ability to catalyze the oxidation of numerous types of phenolic compounds with antioxidant and neurotransmitter roles. This review critically examines the main tyrosinase immobilization techniques for the development of sensitive electrochemical biosensors. Immobilization strategies are mainly classified according to the degree of reversibility/irreversibility of enzyme binding to the support material. Each tyrosinase immobilization method has advantages and limitations, and its selection depends mainly on the type of support electrode, electrode-modifying nanomaterials, cross-linking agent or surfactants used. Tyrosinase immobilization by cross-linking is characterized by very frequent use with outstanding performance of the developed biosensors. Additionally, research in recent years has focused on new immobilization strategies involving cross-linking, such as cross-linked enzyme aggregates (CLEAs) and magnetic cross-linked enzyme aggregates (mCLEAs). Therefore, it can be considered that cross-linking immobilization is the most feasible and economical approach, also providing the possibility of selecting the reagents used and the order of the immobilization steps, which favor the enhancement of biosensor performance characteristics.
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Buitrago E, Faure C, Carotti M, Bergantino E, Hardré R, Maresca M, Philouze C, Vanthuyne N, Boumendjel A, Bubacco L, du Moulinet d'Hardemare A, Jamet H, Réglier M, Belle C. Exploiting HOPNO-dicopper center interaction to development of inhibitors for human tyrosinase. Eur J Med Chem 2023; 248:115090. [PMID: 36634457 DOI: 10.1016/j.ejmech.2023.115090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/23/2022] [Accepted: 01/03/2023] [Indexed: 01/05/2023]
Abstract
In human, Tyrosinase enzyme (TyH) is involved in the key steps of protective pigments biosynthesis (in skin, eyes and hair). The use of molecules targeting its binuclear copper active site represents a relevant strategy to regulate TyH activities. In this work, we targeted 2-Hydroxypyridine-N-oxide analogs (HOPNO, an established chelating group for the tyrosinase dicopper active site) with the aim to combine effects induced by combination with a reference inhibitor (kojic acid) or natural substrate (tyrosine). The HOPNO-MeOH (3) and the racemic amino acid HOPNO-AA compounds (11) were tested on purified tyrosinases from different sources (fungal, bacterial and human) for comparison purposes. Both compounds have more potent inhibitory activities than the parent HOPNO moiety and display strictly competitive inhibition constant, in particular with human tyrosinase. Furthermore, 11 appears to be the most active on the B16-F1 mammal melanoma cells. The investigations were completed by stereospecificity analysis. Racemic mixture of the fully protected amino acid 10 was separated by chiral HPLC into the corresponding enantiomers. Assignment of the absolute configuration of the deprotected compounds was completed, based on X-ray crystallography. The inhibition activities on melanin production were tested on lysates and whole human melanoma MNT-1 cells. Results showed significant enhancement of the inhibitory effects for the (S) enantiomer compared to the (R) enantiomer. Computational studies led to an explanation of this difference of activity based for both enantiomers on the respective position of the amino acid group versus the HOPNO plane.
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Affiliation(s)
- Elina Buitrago
- University of Grenoble Alpes, CNRS-UGA UMR 5250, DCM, CS 40700, 38058, Grenoble, Cedex 9, France; University of Grenoble Alpes, CNRS-UGA UMR 5063, DPM CS 40700, 38058, Grenoble, Cedex 9, France
| | - Clarisse Faure
- University of Grenoble Alpes, CNRS-UGA UMR 5250, DCM, CS 40700, 38058, Grenoble, Cedex 9, France
| | - Marcello Carotti
- Department of Biology, University of Padova, Via Ugo Bassi 58b, 35121, Padova, Italy
| | - Elisabetta Bergantino
- Department of Biology, University of Padova, Via Ugo Bassi 58b, 35121, Padova, Italy
| | - Renaud Hardré
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Marc Maresca
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Christian Philouze
- University of Grenoble Alpes, CNRS-UGA UMR 5250, DCM, CS 40700, 38058, Grenoble, Cedex 9, France
| | - Nicolas Vanthuyne
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Ahcène Boumendjel
- University of Grenoble Alpes, CNRS-UGA UMR 5063, DPM CS 40700, 38058, Grenoble, Cedex 9, France
| | - Luigi Bubacco
- Department of Biology, University of Padova, Via Ugo Bassi 58b, 35121, Padova, Italy
| | | | - Hélène Jamet
- University of Grenoble Alpes, CNRS-UGA UMR 5250, DCM, CS 40700, 38058, Grenoble, Cedex 9, France
| | - Marius Réglier
- Aix Marseille University, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Catherine Belle
- University of Grenoble Alpes, CNRS-UGA UMR 5250, DCM, CS 40700, 38058, Grenoble, Cedex 9, France.
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Carcelli M, Compari C, Fisicaro E, Incerti M, Miglioli F, Peracchia E, Pertinhez TA, Rogolino D, Ronda N, Gentili S, Tegoni M. A potentiometric and spectrofluorimetric approach to unravel inhibitory effects of semi- and thiosemicarbazones on mushroom tyrosinase activity. J Biol Inorg Chem 2023; 28:17-27. [PMID: 36459222 DOI: 10.1007/s00775-022-01976-x] [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: 09/12/2022] [Accepted: 11/08/2022] [Indexed: 12/04/2022]
Abstract
The inhibitory effects on mushrooms tyrosinase activity of some semi- and thiosemicarbazones were investigated. While the semicarbazones are inactive, the thiosemicarbazones are, in general, more active than the reference (kojic acid, IC50 = 70 μM), with maximum activity obtained with benzaldehyde thiosemicarbazone (IC50 = 7 μM). These inhibitors probably act by coordination of the copper(II) metal ions in the active site of tyrosinase: effectively, potentiometric studies conducted in water solutions confirm that the most active thiosemicarbazone is a good ligand for copper(II) ions. The tyrosinase CD spectra do not show any significant difference by addition of an inhibitor or an inactive compound. On the contrary, interesting results were obtained by spectrofluorimetric titrations of mushrooms tyrosinase aqueous solutions with some of the investigated compounds, giving helpful information about possible mechanism of action. The thiosemicarbazones here reported are not cytotoxic on human fibroblasts and do not activate cells in a pro-inflammatory way.
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Affiliation(s)
- M Carcelli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy.
| | - C Compari
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - E Fisicaro
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - M Incerti
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - F Miglioli
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - E Peracchia
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - T A Pertinhez
- Department of Medicine and Surgery, University of Parma, Via Volturno 39, 43125, Parma, Italy
| | - D Rogolino
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - N Ronda
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124, Parma, Italy
| | - S Gentili
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - M Tegoni
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
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7
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Shin M, Truong VL, Lee M, Kim D, Kim MS, Cho H, Jung YH, Yang J, Jeong WS, Kim Y. Investigation of phenyllactic acid as a potent tyrosinase inhibitor produced by probiotics. Curr Res Food Sci 2022; 6:100413. [PMID: 36569188 PMCID: PMC9772785 DOI: 10.1016/j.crfs.2022.100413] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/06/2022] [Accepted: 12/08/2022] [Indexed: 12/13/2022] Open
Abstract
Melanogenesis is responsible for skin pigmentation and the enzymatic browning of foods. Tyrosinases play a major role in melanin synthesis, and many attempts have been made to identify new natural tyrosinase inhibitors, but few have sought to do in microbes. Postbiotics are bioactive compounds produced by the metabolism of probiotics and have been reported to be safe and effective. In this study, we evaluated the tyrosinase inhibitory effects of culture supernatants of probiotics and discovered novel bacterial metabolites that can be used as a potent tyrosinase inhibitor based on metabolomics. Cultures of Bifidobacterium bifidum IDCC 4201 and Lactiplantibacillus plantarum IDCC 3501 showed effective anti-tyrosinase, reduced melanin synthesis, and altered protein expression associated with the melanogenesis pathway. Comparative metabolomics analyses conducted by GC-MS identified metabolites commonly produced by B. bifidum and L. plantarum. Of eight selected metabolites, phenyllactic acid exhibited significant tyrosinase-inhibitory activity. Our findings suggest that applications of probiotic culture supernatants containing high amounts of phenyllactic acid have potential use as anti-melanogenesis agents in food and medicines.
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Affiliation(s)
- Minhye Shin
- Department of Microbiology, College of Medicine, Inha University, Incheon, 22212, Republic of Korea
- Department of Biomedical Science, Program in Biomedical Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Van-Long Truong
- Food and Bio-industry Research Institute, School of Food Science & Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Minjee Lee
- Ildong Bioscience, Pyeongtaek-si, Gyeonggi-do, 17957, Republic of Korea
| | - Donggyu Kim
- Department of Microbiology, College of Medicine, Inha University, Incheon, 22212, Republic of Korea
- Department of Biomedical Science, Program in Biomedical Science and Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Myun Soo Kim
- ICBIO, Cheonan-si, Chungchengnam-do, 31027, Republic of Korea
| | - Hana Cho
- ICBIO, Cheonan-si, Chungchengnam-do, 31027, Republic of Korea
| | - Young Hoon Jung
- Food and Bio-industry Research Institute, School of Food Science & Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Jungwoo Yang
- Ildong Bioscience, Pyeongtaek-si, Gyeonggi-do, 17957, Republic of Korea
- Corresponding author.
| | - Woo Sik Jeong
- Food and Bio-industry Research Institute, School of Food Science & Biotechnology, College of Agriculture and Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
- Corresponding author.
| | - Younghoon Kim
- Department of Agricultural Biotechnology, Research Institute of Agriculture and Life Science, Seoul National University, Seoul, 08826, Republic of Korea
- Corresponding author.
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Design, synthesis and biological evaluation of tyrosinase-targeting PROTACs. Eur J Med Chem 2021; 226:113850. [PMID: 34628235 DOI: 10.1016/j.ejmech.2021.113850] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 09/09/2021] [Accepted: 09/09/2021] [Indexed: 02/05/2023]
Abstract
The human tyrosinase is the most prominent therapeutic target for pigmentary skin disorders. However, the overwhelming majority efforts have been devoted to search mushroom tyrosinase inhibitors, which show poor inhibitory activity on human tyrosinase and certain side effects that cause skin damage in practical application. Herein, a series of degraders that directly targeted human tyrosinase was firstly designed and synthesized based on newly developed PROTAC technology. The best PROTAC TD9 induced human tyrosinase degradation obviously in dose and time-dependent manner, and its mechanism of inducing tyrosinase degradation has also been clearly demonstrated. Besides, encouraging results that low-toxicity PROTAC TD9 was applied to reduce zebrafish melanin synthesis have been obtained, highlighting the potential to treatment of tyrosinase-related disorders. Moreover, this work has innovatively expanded the application scope of PROTAC technology and laid a solid foundation for further development of novel drugs treating pigmentary skin disorders.
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Yaari Z, Cheung JM, Baker HA, Frederiksen RS, Jena PV, Horoszko CP, Jiao F, Scheuring S, Luo M, Heller DA. Nanoreporter of an Enzymatic Suicide Inactivation Pathway. NANO LETTERS 2020; 20:7819-7827. [PMID: 33119310 PMCID: PMC8177003 DOI: 10.1021/acs.nanolett.0c01858] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Enzymatic suicide inactivation, a route of permanent enzyme inhibition, is the mechanism of action for a wide array of pharmaceuticals. Here, we developed the first nanosensor that selectively reports the suicide inactivation pathway of an enzyme. The sensor is based on modulation of the near-infrared fluorescence of an enzyme-bound carbon nanotube. The nanosensor responded selectively to substrate-mediated suicide inactivation of the tyrosinase enzyme via bathochromic shifting of the nanotube emission wavelength. Mechanistic investigations revealed that singlet oxygen generated by the suicide inactivation pathway induced the response. We used the nanosensor to quantify the degree of enzymatic inactivation by measuring response rates to small molecule tyrosinase modulators. This work resulted in a new capability of interrogating a specific route of enzymatic death. Potential applications include drug screening and hit-validation for compounds that elicit or inhibit enzymatic inactivation and single-molecule measurements to assess population heterogeneity in enzyme activity.
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Affiliation(s)
- Zvi Yaari
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Justin M. Cheung
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Hanan A. Baker
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
- Department of Physiology and Biophysics, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
| | - Rune S. Frederiksen
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Prakrit V. Jena
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Christopher, P. Horoszko
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
- Department of Pharmacology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
| | - Fang Jiao
- Department of Physiology and Biophysics, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
- Department of Anesthesiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
| | - Simon Scheuring
- Department of Physiology and Biophysics, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
- Department of Anesthesiology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
| | - Minkui Luo
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
- Department of Pharmacology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
| | - Daniel A. Heller
- Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
- Department of Physiology and Biophysics, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
- Department of Pharmacology, Weill Cornell Medicine, 1300 York Avenue, New York, NY, 10065, United States
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10
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Fernandez-Julia PJ, Tudela-Serrano J, Garcia-Molina F, Garcia-Canovas F, Garcia-Jimenez A, Munoz-Munoz JL. Study of tyrosine and dopa enantiomers as tyrosinase substrates initiating l- and d-melanogenesis pathways. Biotechnol Appl Biochem 2020; 68:823-831. [PMID: 32776353 DOI: 10.1002/bab.1998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 07/28/2020] [Indexed: 11/08/2022]
Abstract
Tyrosinase starts melanogenesis and determines its course, catalyzing the oxidation by molecular oxygen of tyrosine to dopa, and that of dopa to dopaquinone. Then, nonenzymatic coupling reactions lead to dopachrome, which evolves toward melanin. Recently, it has been reported that d-tyrosine acts as tyrosinase inhibitor and depigmenting agent. The action of tyrosinase on the enantiomers of tyrosine (l-tyrosine and d-tyrosine) and dopa (l-dopa and d-dopa) was studied for the first time focusing on quantitative transient phase kinetics. Post-steady-state transient phase studies revealed that l-dopachrome is formed more rapidly than d-dopachrome. This is due to the lower values of Michaelis constants for l-enantiomers than for d-enantiomers, although the maximum rates are equal for both enantiomers. A deeper analysis of the inter-steady-state transient phase of monophenols demonstrated that the enantiomer d-tyrosine causes a longer lag period and a lower steady-state rate, than l-tyrosine at the same concentration. Therefore, d-melanogenesis from d-tyrosine occurs more slowly than does l-melanogenesis from l-tyrosine, which suggests the apparent inhibition of melanin biosynthesis by d-tyrosine. As conclusion, d-tyrosine acts as a real substrate of tyrosinase, with low catalytic efficiency and, therefore, delays the formation of d-melanin.
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Affiliation(s)
- Pedro J Fernandez-Julia
- Microbial Enzymology Group, Department of Applied Sciences, Northumberland Building, University of Northumbria, Newcastle Upon Tyne, UK
| | - Jose Tudela-Serrano
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum,", University of Murcia, Espinardo, Murcia, Spain
| | - Francisco Garcia-Molina
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum,", University of Murcia, Espinardo, Murcia, Spain
| | - Francisco Garcia-Canovas
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum,", University of Murcia, Espinardo, Murcia, Spain
| | - Antonia Garcia-Jimenez
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum,", University of Murcia, Espinardo, Murcia, Spain
| | - Jose L Munoz-Munoz
- Microbial Enzymology Group, Department of Applied Sciences, Northumberland Building, University of Northumbria, Newcastle Upon Tyne, UK
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11
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RNA-seq Reveals Dysregulation of Novel Melanocyte Genes upon Oxidative Stress: Implications in Vitiligo Pathogenesis. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2019; 2019:2841814. [PMID: 31871544 PMCID: PMC6913168 DOI: 10.1155/2019/2841814] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 10/01/2019] [Indexed: 01/01/2023]
Abstract
Oxidative stress is known to induce melanocyte death, but the underlying mechanisms are incompletely understood. To identify oxidative stress-induced global gene expression changes in melanocytes, we treated PIG1 melanocytes with H2O2 in a dose- and time-dependent manner and performed RNA-seq. This approach allowed us to capture the events occurring early as well as late phase after treatment with H2O2. Our bioinformatics analysis identified differentially expressed genes involved in various biological processes of melanocytes which are known to contribute to the vitiligo development, such as apoptosis, autophagy, cell cycle regulation, cell adhesion, immune and inflammatory responses, melanocyte pluripotency, and developmental signaling such as WNT and NOTCH pathways. We uncovered several novel genes that are not previously described to be involved in melanocytic response to stress nor in vitiligo pathogenesis. Quantitative PCR and western blot analysis of selected proteins, performed on PIG1 and primary human epidermal melanocytes, confirmed the RNA-seq data. Interestingly, we discovered an aberrant regulation of several transcription factors that are involved in diabetes, neurological, and psychiatric diseases, all of which are comorbid conditions in patients with vitiligo. Our results may lead to a better understanding of the molecular mechanisms underlying vitiligo pathogenesis and help developing new drug targets for effective treatment.
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12
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Zolghadri S, Bahrami A, Hassan Khan MT, Munoz-Munoz J, Garcia-Molina F, Garcia-Canovas F, Saboury AA. A comprehensive review on tyrosinase inhibitors. J Enzyme Inhib Med Chem 2019; 34:279-309. [PMID: 30734608 PMCID: PMC6327992 DOI: 10.1080/14756366.2018.1545767] [Citation(s) in RCA: 511] [Impact Index Per Article: 102.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 12/17/2022] Open
Abstract
Tyrosinase is a multi-copper enzyme which is widely distributed in different organisms and plays an important role in the melanogenesis and enzymatic browning. Therefore, its inhibitors can be attractive in cosmetics and medicinal industries as depigmentation agents and also in food and agriculture industries as antibrowning compounds. For this purpose, many natural, semi-synthetic and synthetic inhibitors have been developed by different screening methods to date. This review has focused on the tyrosinase inhibitors discovered from all sources and biochemically characterised in the last four decades.
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Affiliation(s)
- Samaneh Zolghadri
- Department of Biology, Jahrom Branch, Islamic Azad University, Jahrom, Iran
| | - Asieh Bahrami
- Department of Biology, Jahrom Branch, Islamic Azad University, Jahrom, Iran
| | | | - J. Munoz-Munoz
- Group of Microbiology, Department of Applied Sciences, Northumbria University at Newcastle, Newcastle Upon Tyne, UK
| | - F. Garcia-Molina
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, Espinardo, Murcia, Spain
| | - F. Garcia-Canovas
- GENZ-Group of Research on Enzymology, Department of Biochemistry and Molecular Biology-A, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, Espinardo, Murcia, Spain
| | - Ali Akbar Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
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13
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Son HF, Lee SH, Lee SH, Kim H, Hong H, Lee UJ, Lee PG, Kim BG, Kim KJ. Structural Basis for Highly Efficient Production of Catechol Derivatives at Acidic pH by Tyrosinase from Burkholderia thailandensis. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02635] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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14
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Pillaiyar T, Namasivayam V, Manickam M, Jung SH. Inhibitors of Melanogenesis: An Updated Review. J Med Chem 2018; 61:7395-7418. [PMID: 29763564 DOI: 10.1021/acs.jmedchem.7b00967] [Citation(s) in RCA: 175] [Impact Index Per Article: 29.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Melanins are pigment molecules that determine the skin, eye, and hair color of the human subject to its amount, quality, and distribution. Melanocytes synthesize melanin and provide epidermal protection from various stimuli, such as harmful ultraviolet radiation, through the complex process called melanogenesis. However, serious dermatological problems occur when there is excessive production of melanin in different parts of the human body. These include freckles, melasma, senile lentigo, pigmented acne scars, and cancer. Therefore, controlling the production of melanin is an important approach for the treatment of pigmentation related disorderes. In this Perspective, we focus on the inhibitors of melanogenesis that directly/indirectly target a key enzyme tyrosinase as well as its associated signaling pathways.
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Affiliation(s)
- Thanigaimalai Pillaiyar
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I , University of Bonn , An der Immenburg 4 , D-53121 Bonn , Germany
| | - Vigneshwaran Namasivayam
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I , University of Bonn , An der Immenburg 4 , D-53121 Bonn , Germany
| | - Manoj Manickam
- College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon 34134 , Korea
| | - Sang-Hun Jung
- College of Pharmacy and Institute of Drug Research and Development , Chungnam National University , Daejeon 34134 , Korea
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15
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Mondal S, Thampi A, Puranik M. Kinetics of Melanin Polymerization during Enzymatic and Nonenzymatic Oxidation. J Phys Chem B 2018; 122:2047-2063. [PMID: 29364665 DOI: 10.1021/acs.jpcb.7b07941] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Melanin is an abundant biopigment in the animal kingdom, but its structure remains poorly understood. This is a substantial impediment to understanding the mechanistic origin of its observed functions. Proposed models of melanin structure include aggregates of both linear and macrocyclic units and noncovalently held monomers. Both models are broadly in agreement with current experimental data. To constrain the structural and kinetic models of melanin, experimental data of high resolution with chemical specificity accompanied by atomistic modeling are required. We have addressed this by obtaining electronic absorption, infrared, and ultraviolet resonance Raman (RR) spectra of melanin at several wavelengths of excitation that are sensitive to small changes in structure. From these experiments, we observed kinetics of the formation of different species en route to melanin polymerization. Exclusive chemical signatures of monomer 3,4-dihydroxyphenylalanine (dopa), intermediate dopachrome (DC), and early-time polymer are established through their vibrational bands at 1292, 1670, and 1616 cm-1 respectively. Direct evidence of reduced heterogeneity of melanin oligomers in tyrosinase-induced formation is provided from experimental measurements of vibrational bandwidths. Models made with density functional theory show that the linear homopolymeric structures of 5,6-dihydroxyindole can account for experimentally observed wavenumbers and broad bandwidth in Raman spectra of dopa-melanin. We capture resonance Raman (RR) signature of DC, the intermediate stabilized by the enzyme tyrosinase, for the first time in an enzyme-assisted melanization reaction using 488 nm excitation wavelength and propose that this wavelength can be used to probe reaction intermediates of melanin formation in solution.
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Affiliation(s)
- Sayan Mondal
- Indian Institute of Science Education and Research , Pune 411008, India
| | - Arya Thampi
- Indian Institute of Science Education and Research , Pune 411008, India
| | - Mrinalini Puranik
- Indian Institute of Science Education and Research , Pune 411008, India
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16
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Hamann JN, Herzigkeit B, Jurgeleit R, Tuczek F. Small-molecule models of tyrosinase: From ligand hydroxylation to catalytic monooxygenation of external substrates. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2016.07.009] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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17
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Kanteev M, Goldfeder M, Fishman A. Structure-function correlations in tyrosinases. Protein Sci 2015; 24:1360-9. [PMID: 26104241 DOI: 10.1002/pro.2734] [Citation(s) in RCA: 131] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Accepted: 06/19/2015] [Indexed: 11/08/2022]
Abstract
Tyrosinases are metalloenzymes belonging to the type-3 copper protein family which contain two copper ions in the active site. They are found in various prokaryotes as well as in plants, fungi, arthropods, and mammals and are responsible for pigmentation, wound healing, radiation protection, and primary immune response. Tyrosinases perform two sequential enzymatic reactions: hydroxylation of monophenols and oxidation of diphenols to form quinones which polymerize spontaneously to melanin. Two other members of this family are catechol oxidases, which are prevalent mainly in plants and perform only the second oxidation step, and hemocyanins, which lack enzymatic activity and are oxygen carriers. In the last decade, several structures of plant and bacterial tyrosinases were determined, some with substrates or inhibitors, highlighting features and residues which are important for copper uptake and catalysis. This review summarizes the updated information on structure-function correlations in tyrosinases along with comparison to other type-3 copper proteins.
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Affiliation(s)
- Margarita Kanteev
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
| | - Mor Goldfeder
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
| | - Ayelet Fishman
- Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel
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18
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Qin L, Wu Y, Liu Y, Chen Y, Zhang P. Dual effects of alpha-arbutin on monophenolase and diphenolase activities of mushroom tyrosinase. PLoS One 2014; 9:e109398. [PMID: 25303458 PMCID: PMC4193772 DOI: 10.1371/journal.pone.0109398] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 09/10/2014] [Indexed: 11/19/2022] Open
Abstract
The effects of α-arbutin on the monophenolase and diphenolase activities of mushroom tyrosinase were investigated. The results showed that α-arbutin inhibited monophenolase activity but it activated diphenolase activity. For monophenolase activity, IC50 value was 4.5 mmol·L−1 and 4.18 mmol·L−1 of α-arbutin could extend the lag time from 40.5 s to 167.3 s. Alpha- arbutin is proposed to be regarded as a triphenolic substrate by the enzyme during catalyzation, leading to the suicide inactivation of the active site of tyrosinase. For diphenolase activity, α-arbutin acted as an activator and its activation mechanism was mixed type activation. To reveal such activation, it should be mainly refered to the conformational changes in tyrosinase caused by the interaction of α-arbutin with residues located at the entrance to the active site, and the decrease of the effect of suicide inactivation.
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Affiliation(s)
- Liang Qin
- Beijing Bioprocess Key Laboratory, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Yang Wu
- Beijing Bioprocess Key Laboratory, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Youting Liu
- Beijing Bioprocess Key Laboratory, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Yiming Chen
- Beijing Bioprocess Key Laboratory, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
| | - Peng Zhang
- Beijing Bioprocess Key Laboratory, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
- * E-mail:
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19
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Gao J, Shi Y, Wang Y, Cai Y, Shen J, Kong D, Yang Z. Enzyme-controllable F-NMR turn on through disassembly of peptide-based nanospheres for enzyme detection. Org Biomol Chem 2014; 12:1383-6. [DOI: 10.1039/c3ob42078g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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20
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Tang J, Li Q, Cheng B, Jing L. Primary culture of human face skin melanocytes for the study of hyperpigmentation. Cytotechnology 2013; 66:891-8. [PMID: 24113919 DOI: 10.1007/s10616-013-9643-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 08/31/2013] [Indexed: 11/28/2022] Open
Abstract
Facial epidermal pigmentation and skin tumors can be caused by UV exposure and other physical and chemical irritations. In this report we describe the primary culture of melanocytes from human face skin. The ability to culture these melanocytes will enable their morphological and biological properties to be investigated. Skin specimens were obtained from patients who had undergone lower blepharoplasty procedures. Digestion with neutral protease and trypsin was used to obtain single cell suspensions of epidermal cells. The cells were cultured in M254 medium supplemented with human melanocyte growth solution. Cell morphology was observed using inverted microscopy. Melanocytes were positively identified using both L-DOPA staining and S-100 protein immunohistochemical staining. Immunofluorescence was used to confirm the expression of tyrosinase-related protein-1, a melanocyte-specific protein. The cellular ultrastructure of the melanocytes was observed by transmission electron microscopy. The cultured human melanocytes from face skin were multi-dendritic, and many mature melanosomes were observed. Therefore, using a specific culture medium, melanocytes from face skin can be successfully cultured and made available for further investigations.
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Affiliation(s)
- Jianbing Tang
- Department of Plastic Surgery, The Key Laboratory of Trauma Treatment and Tissue Repair of Tropical Area, HuaBo Bio-pharmaceutic Institute of Guangzhou, General Hospital of Guangzhou Military Command, Guangzhou, 510010, People's Republic of China
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21
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Muñoz-Muñoz JL, García-Molina MDM, García-Molina F, Varon R, García-Ruiz PA, Rodríguez-López JN, García-Cánovas F. Indirect inactivation of tyrosinase in its action on 4-tert-butylphenol. J Enzyme Inhib Med Chem 2013; 29:344-52. [PMID: 23578311 DOI: 10.3109/14756366.2013.782298] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Under anaerobic conditions, the o-diphenol 4-tert-butylcatechol (TBC) irreversibly inactivates met and deoxytyrosinase enzymatic forms of tyrosinase. However, the monophenol 4-tert-butylphenol (TBF) protects the enzyme from this inactivation. Under aerobic conditions, the enzyme suffers suicide inactivation when it acts on TBC. We suggest that TBF does not directly cause the suicide inactivation of the enzyme in the hydroxylase activity, but that the o-diphenol, which is necessary for the system to reach the steady state, is responsible for the process. Therefore, monophenols do not induce the suicide inactivation of tyrosinase in its hydroxylase activity, and there is a great difference between the monophenols that give rise to unstable o-quinones such as L-tyrosine, which rapidly accumulate L-dopa in the medium and those like TBF, after oxidation, give rise to a very stable o-quinone.
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Affiliation(s)
- Jose Luis Muñoz-Muñoz
- GENZ: Grupo de Investigación Enzimología, Departamento de Bioquímica y Biología Molecular-A, Facultad de Biología, Universidad de Murcia , Espinardo, Murcia , Spain
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22
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Sun W, Wendt M, Klebe G, Röhm KH. On the interpretation of tyrosinase inhibition kinetics. J Enzyme Inhib Med Chem 2013; 29:92-9. [PMID: 23323989 DOI: 10.3109/14756366.2012.755621] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract Tyrosinases (monophenol monooxygenases, EC 1.14.18.1) utilize a reaction mechanism that involves two intertwined catalytic cycles and at least three different ligand-binding enzyme forms. Therefore a variety of different inhibition types may arise in inhibition experiments, depending on the binding mode of the compound studied. Here we discuss a steady-state equation that describes inhibition of the diphenolase cycle of tyrosinase catalysis in a general way. In addition, we employ numerical simulations to explore the kinetic outcome of various binding schemes. As the full equation is far too complex to be applicable for data evaluation by curve fitting, we propose to use the general modifier scheme of Botts-Morales for fitting and demonstrate that especially the value of parameter α of the equation allows conclusions about the binding mode of the inhibitor. The approach is exemplified by selected data describing the inhibition of human tyrosinase by typical inhibitors.
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Affiliation(s)
- Wei Sun
- Institute of Pharmaceutical Chemistry and
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23
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Muñoz-Muñoz JL, Berna J, Garcia-Molina F, Garcia-Ruiz PA, Tudela J, Rodriguez-Lopez JN, Garcia-Canovas F. Unravelling the suicide inactivation of tyrosinase: A discrimination between mechanisms. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2011.11.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Muñoz-Muñoz JL, Garcia-Molina F, Berna J, Garcia-Ruiz PA, Varon R, Tudela J, Rodriguez-Lopez JN, Garcia-Canovas F. Kinetic characterisation of o-aminophenols and aromatic o-diamines as suicide substrates of tyrosinase. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:647-55. [PMID: 22342555 DOI: 10.1016/j.bbapap.2012.02.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Revised: 01/31/2012] [Accepted: 02/01/2012] [Indexed: 11/15/2022]
Abstract
We study the suicide inactivation of tyrosinase acting on o-aminophenols and aromatic o-diamines and compare the results with those obtained for the corresponding o-diphenols. The catalytic constants follow the order aromatic o-diamines<o-aminophenols<o-diphenols, which agrees with the view that the transfer of the proton to the peroxide group of the oxy-tyrosinase form is the slowest step in the catalytic cycle. As regards the apparent inactivation constant, it remains within the same order of magnitude, although slightly lower in the case of the aromatic o-diamines and o-aminophenols than o-diphenols: o-diamines<o-aminophenols<o-diphenols. The efficiency of the second nucleophilic attack of substrate on CuA seems to be the determining factor in the bifurcation of the inactivation and catalytic pathways. This attack is more efficient in o-diamines (where it attacks a nitrogen atom) than in o-aminophenols and o-diphenols (where it attacks an oxygen atom), favouring the catalytic pathway and slowing down the inactivation pathway. The inactivation step is the slowest of the whole process. The values of r, the number of turnovers that 1mol of enzyme carries out before being inactivated, follows the order aromatic o-diamines<o-aminophenols<o-diphenols. As regards the Michaelis constants, that of the o-diamines is slightly lower than that of the o-diphenols, while that of the o-aminophenols is slightly greater than that observed for the o-diphenols. As a consequence of the above, the inactivation efficiency, λ(max)/K(m)(S), follows this order: o-diphenols>o-aminophenols>aromatic o-diamines.
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Affiliation(s)
- Jose Luis Muñoz-Muñoz
- Departamento de Bioquímica y Biología Molecular-A, Universidad de Murcia,Espinardo, Murcia, Spain
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25
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Soares AR, de Lourdes Lucio Ferrarese M, de Cássia Siqueira-Soares R, Marchiosi R, Finger-Teixeira A, Ferrarese-Filho O. The allelochemical L-DOPA increases melanin production and reduces reactive oxygen species in soybean roots. J Chem Ecol 2011; 37:891-8. [PMID: 21710366 DOI: 10.1007/s10886-011-9988-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2011] [Revised: 06/09/2011] [Accepted: 06/10/2011] [Indexed: 12/16/2022]
Abstract
The non-protein amino acid, L-3,4-dihydroxyphenylalanine (L-DOPA), is the main allelochemical released from the roots of velvetbean and affects seed germination and root growth of several plant species. In the work presented here, we evaluated, in soybean roots, the effects of L-DOPA on the following: polyphenol oxidase (PPO), superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) activities; superoxide anion (O·-2), hydrogen peroxide (H(2)O(2)), and melanin contents; and lipid peroxidation. To this end, 3-day-old seedlings were cultivated in half-strength Hoagland's solution (pH 6.0), with or without 0.1 to 1.0 mM L-DOPA in a growth chamber (at 25°C, with a light/dark photoperiod of 12/12 hr and a photon flux density of 280 μmol m(-2) s(-1)) for 24 hr. The results showed that L-DOPA increased the PPO activity and, further, the melanin content. The activities of SOD and POD increased, but CAT activity decreased after the chemical exposure. The contents of reactive oxygen species (ROS), such as O·-2 and H(2)O(2), and the levels of lipid peroxidation significantly decreased under all concentrations of L-DOPA tested. These results suggest that L-DOPA was absorbed by the soybean roots and metabolized to melanin. It was concluded that the reduction in the O·-2 and H(2)O(2) contents and lipid peroxidation in soybean roots was due to the enhanced SOD and POD activities and thus a possible antioxidant role of L-DOPA.
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Affiliation(s)
- Anderson Ricardo Soares
- Laboratory of Plant Biochemistry, University of Maringá, Av. Colombo, 5790, 87020-900, Maringá, PR, Brazil
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26
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Muñoz-Muñoz JL, Garcia-Molina F, Varon R, Garcia-Ruíz PA, Tudela J, Garcia-Cánovas F, Rodríguez-López JN. Suicide inactivation of the diphenolase and monophenolase activities of tyrosinase. IUBMB Life 2010; 62:539-47. [PMID: 20552645 DOI: 10.1002/iub.348] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The suicide inactivation mechanism of tyrosinase acting on its phenolic substrates has been studied. Kinetic analysis of the proposed mechanism during the transition phase provides explicit analytical expressions for the concentrations of o-quinone versus time. The electronic, steric, and hydrophobic effects of the phenolic substrates influence the enzymatic reaction, increasing the catalytic speed by three orders of magnitude and the inactivation by one order of magnitude. To explain this suicide inactivation, we propose a mechanism in which the enzymatic form oxy-tyrosinase is responsible for the inactivation. In this mechanism, the rate constant of the reaction would be directly related with the strength of the nucleophilic attack of the C-1 hydroxyl group, which depends on the chemical shift of the carbon C-1 (delta(1)) obtained by (13)C-NMR. The suicide inactivation would occur if the C-2 hydroxyl group transferred the proton to the protonated peroxide, which would again act as a general base. In this case, the coplanarity between the copper atom, the oxygen of the C-1 and the ring would only permit the oxidation/reduction of one copper atom, giving rise to copper (0), hydrogen peroxide, and an o-quinone, which would be released, thus inactivating the enzyme. One possible application of this property could be the use of these suicide substrates as skin depigmenting agents.
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Affiliation(s)
- Jose Luis Muñoz-Muñoz
- Departamento de Bioquímica y Biología Molecular-A, Facultad de Biologia, Universidad de Murcia, Espinardo, Murcia, Spain
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27
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Yamazaki Y, Kawano Y. N-(3,5-Dihydroxybenzoyl)-6-hydroxytryptamine as a Novel Human Tyrosinase Inhibitor That Inactivates the Enzyme in Cooperation with L-3,4-Dihydroxyphenylalanine. Chem Pharm Bull (Tokyo) 2010; 58:1536-40. [DOI: 10.1248/cpb.58.1536] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yoshimitsu Yamazaki
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology
| | - Yasuhiro Kawano
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology
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