1
|
Campos RB, Capato LA, Soares PM, Tantillo DJ, Orth ES. Thio-Induced Organophosphate Breakdown Promoted by Methimazole: an Experimental and Theoretical Study. Chempluschem 2024:e202300756. [PMID: 38412020 DOI: 10.1002/cplu.202300756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/27/2024] [Accepted: 02/27/2024] [Indexed: 02/28/2024]
Abstract
Investigating the reactivity of small nucleophilic scaffolds is a strategic approach for the design of new catalysts aiming at effective detoxification processes of organophosphorus compounds. The drug methimazole (MMZ) is an interesting candidate featuring two non-equivalent nucleophilic centers. Herein, phosphoryl transfer reactions mediated by MMZ were assessed by means of spectrophotometric kinetic studies, mass spectrometry (MS) analyses, and density functional theory (DFT) calculations using the multi-electrophilic compound O,O-diethyl 2,4-dinitrophenyl phosphate (DEDNPP). MMZ anion acts primarily as an S-nucleophile, exhibiting a nucleophilic activity comparable to that of certain oximes featuring alpha-effect. Selective nucleophilic aromatic substitution was observed, consistent with the DFT prediction of a low energy barrier. Overall, the results bring important advances regarding the mechanistic understanding of nucleophilic dephosphorylation reactions, which comprises a strategic tool for neutralizing toxic organophosphates, hence promoting chemical security.
Collapse
Affiliation(s)
- Renan B Campos
- Departamento Acadêmico de Química e Biologia, Universidade Tecnológica Federal do Paraná, Rua Deputado Heitor de Alencar Furtado, 5000, 81280-340, Curitiba, Brazil
| | - Lucas A Capato
- Departamento Acadêmico de Química e Biologia, Universidade Tecnológica Federal do Paraná, Rua Deputado Heitor de Alencar Furtado, 5000, 81280-340, Curitiba, Brazil
| | - Patrícia M Soares
- Chemistry Departament, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990, Curitiba, PR, Brazil
| | - Dean J Tantillo
- Department of Chemistry, University of California-Davis, Davis, California, 95616, United States
| | - Elisa S Orth
- Chemistry Departament, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990, Curitiba, PR, Brazil
| |
Collapse
|
2
|
Non-catalyzed addition of heterocyclic thiols and 5-substituted-1H-tetrazoles to vinyl ethers. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
3
|
Muniz-Miranda M, Muniz-Miranda F, Pedone A. Raman and DFT study of methimazole chemisorbed on gold colloidal nanoparticles. Phys Chem Chem Phys 2016; 18:5974-80. [DOI: 10.1039/c5cp07597a] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The SERS/DFT study of methimazole chemisorbed on Au nanoparticles paves the way for the use of these nanohybrids in biomedicine.
Collapse
Affiliation(s)
| | - Francesco Muniz-Miranda
- Department of Chemical and Geological Sciences (DSCG)
- University of Modena and Reggio Emilia (UniMORE)
- 41125 Modena
- Italy
| | - Alfonso Pedone
- Department of Chemical and Geological Sciences (DSCG)
- University of Modena and Reggio Emilia (UniMORE)
- 41125 Modena
- Italy
| |
Collapse
|
4
|
Komoike Y, Matsuoka M, Kosaki K. Potential Teratogenicity of Methimazole: Exposure of Zebrafish Embryos to Methimazole Causes Similar Developmental Anomalies to Human Methimazole Embryopathy. ACTA ACUST UNITED AC 2013; 98:222-9. [DOI: 10.1002/bdrb.21057] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 02/27/2013] [Accepted: 02/27/2013] [Indexed: 12/27/2022]
Affiliation(s)
- Yuta Komoike
- Department of Hygiene and Public Health I; Tokyo Women's Medical University; Tokyo; Japan
| | - Masato Matsuoka
- Department of Hygiene and Public Health I; Tokyo Women's Medical University; Tokyo; Japan
| | - Kenjiro Kosaki
- Center for Medical Genetics; Keio University School of Medicine; Tokyo; Japan
| |
Collapse
|
5
|
Amin E, Saboury AA, Mansuri-Torshizi H, Moosavi-Movahedi AA. Potent inhibitory effects of benzyl and p-xylidine-bis dithiocarbamate sodium salts on activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2010. [DOI: 10.3109/14756360903179351] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- E. Amin
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - A. A. Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | |
Collapse
|
6
|
Biswas N, Thomas S, Sarkar A, Mukherjee T, Kapoor S. Probing the adsorption mechanism in thiamazole bound to the silver surface with Surface-enhanced Raman Scattering and DFT. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.08.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
7
|
Saboury AA, Zolghadri S, Haghbeen K, Moosavi-Movahedi AA. The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase. J Enzyme Inhib Med Chem 2008; 21:711-7. [PMID: 17252944 DOI: 10.1080/14756360600810787] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
The inhibitory effect of benzenethiol on the cresolase and catecholase activities of mushroom tyrosinase (MT) have been investigated at two temperatures of 20 and 30 degrees C in 10 mM phosphate buffer solution, pHs 5.3 and 6.8. The results show that benzenethiol can inhibit both activities of mushroom tyrosinase competitively. The inhibitory effect of benzenethiol on the cresolase activity is more than the catecholase activity of MT. The inhibition constant (K(i)) value at pH 5.3 is smaller than that at pH 6.8 for both enzyme activities. However, the K(i) value increases in cresolase activity and decreases in catecholase activity due to the increase of temperature from 20 to 30 degrees C at both pHs. Moreover, the effect of temperature on K(i) value is more at pH 6.8 for both cresolase and catecholase activities. The type of binding process is different in the two types of MT activities. The binding process for catecholase inhibition is only entropy driven, which means that the predominant interaction in the active site of the enzyme is hydrophobic, meanwhile the electrostatic interaction can be important for cresolase inhibition due to the enthalpy driven binding process. Fluorescence and circular studies also show a minor change in the tertiary structure, without any change in the secondary structure, of the enzyme due to the electrostatic interaction in cresolase inhibition by benzenethiol at acidic pH.
Collapse
Affiliation(s)
- A A Saboury
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran.
| | | | | | | |
Collapse
|
8
|
Alijanianzadeh M, Saboury AA, Mansuri-Torshizi H, Haghbeen K, Moosavi-Movahedi AA. The inhibitory effect of some new synthesized xanthates on mushroom tyrosinase activities. J Enzyme Inhib Med Chem 2008; 22:239-46. [PMID: 17518352 DOI: 10.1080/14756360601114536] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Three iso-alkyldithiocarbonates (xanthates), as sodium salts, C3H7OCS2Na (I), C4H9OCS2Na (II) and C5H11OCS2Na (III), were synthesized, by the reaction between CS2 with the corresponding iso-alcohol in the presence of NaOH, and examined for inhibition of both cresolase and catecholase activities of mushroom tyrosinase (MT) from a commercial source of Agricus bisporus. 4-[(4-methylbenzo)azo]-1,2-benzendiol (MeBACat) and 4-[(4-methylphenyl)azo]-phenol (MePAPh) were used as synthetic substrates for the enzyme for the catecholase and cresolase reactions, respectively. Lineweaver-Burk plots showed different patterns of mixed and competitive inhibition for the three xanthates and also for cresolase and catecholase activities of MT. For cresolase activity, I and II showed a mixed inhibition pattern but III showed a competitive inhibition pattern. For catecholase activity, I showed mixed inhibition but II and III showed competitive inhibition. These new synthesized compounds are potent inhibitors of MT with K(i) values of 9.8, 7.2 and 6.1 microM for cresolase inhibitory activity, and also 12.9, 21.8 and 42.2 microM for catecholase inhibitory activity for I, II and III, respectively. They showed a greater inhibitory potency towards the cresolase activity of MT. Both substrate and inhibitor can be bound to the enzyme with negative cooperativity between the binding sites (alpha > 1) and this negative cooperativity increases with increasing length of the aliphatic tail in these compounds in both cresolase and catecholase activities. The cresolase inhibition is related to the chelating of the copper ions at the active site by a negative head group (S-) of the anion xanthate, which leads to similar values of K(i) for all three xanthates. Different K(i) values for catecholase inhibition are related to different interactions of the aliphatic chains of I, II and III with hydrophobic pockets in the active site of the enzyme.
Collapse
Affiliation(s)
- M Alijanianzadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | | | |
Collapse
|
9
|
Gheibi N, Saboury AA, Mansuri-Torshizi H, Haghbeen K, Moosavi-Movahedi AA. The inhibition effect of some n-alkyl dithiocarbamates on mushroom tyrosinase. J Enzyme Inhib Med Chem 2008; 20:393-9. [PMID: 16206836 DOI: 10.1080/14756360500179903] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Three new n-alkyl dithiocarbamate compounds, as sodium salts, C4H9NHCS2Na (I), C6H13NHCS2Na (II) and C8H17NHCS2Na (III), were synthesized and examined for inhibition of both cresolase and catecholase activities of mushroom tyrosinase (MT) from a commercial source of Agaricus bisporus in 10 mM phosphate buffer pH 6.8, at 293K using UV spectrophotometry. Caffeic acid and p-coumaric acid were used as natural substrates for the enzyme for the catecholase and cresolase reactions, respectively. Lineweaver-Burk plots showed different patterns of mixed and competitive inhibition for catecholase and cresolase reactions, respectively. These new synthetic compounds can be classified as potent inhibitors of MT due to Ki values of 0.8, 1.0 and 1.8 microM for cresolase inhibitory activity, and also 9.4, 14.5 and 28.1 microM for catecholase inhibitory activity for I, II and III, respectively. They showed a greater potency in the inhibitory effect towards the cresolase activity of MT. Both substrate and inhibitor can be bound to the enzyme with negative cooperativity between the binding sites (alpha > 1) and this negative cooperativity increases with increasing length of the aliphatic tail in these compounds. The inhibition mechanism is presumably related to the chelating of the binuclear coppers at the active site and the different Ki values may be related to different interaction of the aliphatic chains of I, II and III with the hydrophobic pocket in the active site of the enzyme.
Collapse
Affiliation(s)
- N Gheibi
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | | | | | | | | |
Collapse
|
10
|
Determination of methimazole and carbimazole by flow-injection with chemiluminescence detection based on the inhibition of the Cu(II)-catalysed luminol–hydrogen peroxide reaction. Anal Chim Acta 2004. [DOI: 10.1016/s0003-2670(03)00176-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
11
|
|
12
|
|
13
|
Maddaluno JF, Faull KF. Inhibition of mushroom tyrosinase by 3-amino-L-tyrosine: molecular probing of the active site of the enzyme. EXPERIENTIA 1988; 44:885-7. [PMID: 3141207 DOI: 10.1007/bf01941189] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We report the ability of 3-amino-L-tyrosine to act as a fully reversible competitive inhibitor of mushroom tyrosinase. The inhibition is linked to the ortho-aminophenol structure, and a copper bridging mechanism in the active site is proposed.
Collapse
Affiliation(s)
- J F Maddaluno
- Nancy Pritzker Laboratory of Behavioral Neurochemistry, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, California 94305
| | | |
Collapse
|
14
|
Abstract
Methimazole (1-methyl-2-mercaptoimidazole) inhibits both the mono- and the o-dihydroxyphenolase activities of mushroom tyrosinase when assayed spectrophotometrically. With DL-3,4-dihydroxyphenylalanine as substrate, the inhibition was found to be a mixed-type one with Ki 4.6 X 10(-6) M. We found that methimazole can interact with the oxidation products of o-dihydroxyphenols, probably with o-quinones, to form a conjugate. The conjugate formed between methimazole and o-benzoquinone was separated by chromatography on Sephadex G-10 and was characterized by an absorption maximum at 248-260 nm. Our data suggest that methimazole inhibits mushroom tyrosinase activity in two ways: by conjugating with o-quinones, thereby causing an apparent inhibition in pigmented product formation as judged by the spectrophotometric assay; and by chelating copper at the active site of the enzyme, as judged by assaying the release of 3HHO from L-[3,5-3H]tyrosine.
Collapse
|
15
|
Rosenberg RC. Inhibition of dopamine beta-hydroxylase by 2-mercapto-1-methylimidazole. BIOCHIMICA ET BIOPHYSICA ACTA 1983; 749:276-80. [PMID: 6661441 DOI: 10.1016/0167-4838(83)90236-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The inhibition of bovine dopamine beta-hydroxylase (dopamine beta-monooxygenase, EC 1.14.17.1) by 2-mercapto-1-methylimidazole has been studied using a simple, 'metal-free' assay system. 2-Mercapto-1-methylimidazole is an uncompetitive inhibitor of dopamine beta-hydroxylase with respect to ascorbate and a mixed type of inhibitor with respect to tyramine. These findings are consistent with 2-mercapto-1-methylimidazole interacting exclusively with the reduced form of dopamine beta-hydroxylase.
Collapse
|
16
|
Lavrijsen K, Lavrijsen P, Lontie R. Inhibition of mushroom tyrosinases by lamprene and thiambutosine. Biochem Pharmacol 1977. [DOI: 10.1016/0006-2952(77)90096-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
17
|
Fuller RW, Ho PP, Matsumoto C, Clemens JA. New inhibitors of dopamine beta-hydroxylase. ADVANCES IN ENZYME REGULATION 1977; 15:267-81. [PMID: 1036300 DOI: 10.1016/0065-2571(77)90020-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|