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Silva JG, de Miranda AS, Ismail FMD, Barbosa LCA. Synthesis and medicinal chemistry of tetronamides: Promising agrochemicals and antitumoral compounds. Bioorg Med Chem 2022; 67:116815. [PMID: 35598527 DOI: 10.1016/j.bmc.2022.116815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 11/30/2022]
Abstract
Butenolides and tetronic acids occupy a prominent position in synthetic chemistry due to their ubiquitous distribution in nature. This has stimulated investigations firstly in the synthesis of such systems and, laterly, the interest has turned to the understanding of the quantum structure of such systems, allowing a deeper understanding of the mechanism and reactivity of this cyclic scaffold. In contrast, tetronamides, which consist of compounds bearing a 4-aminofuran-2(5H)-one backbone, are relatively rare in nature and synthetic routes to such compounds are poorly explored. This review highlights both the importance of the tetronamide scaffold in medicinal chemistry and the most relevant recondite synthetic strategies for obtaining compounds of this class.
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Affiliation(s)
- Júnio G Silva
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Amanda S de Miranda
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil
| | - Fyaz M D Ismail
- Centre for Natural Product Discovery (CNPD), School of Pharmacy & Biomolecular Sciences, Byrom Street, Liverpool John Moores University, Liverpool L3 3AF, UK
| | - Luiz C A Barbosa
- Department of Chemistry, Universidade Federal de Minas Gerais, Av. Pres. Antônio Carlos, 6627, Campus Pampulha, CEP 31270-901 Belo Horizonte, MG, Brazil.
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Groshi AA, Nahar L, Ismail FMD, Evans AR, Sarker SD. Dichloromethane Extract of the Leaves of Arbutus pavarii Pamp. Exhibits Cytotoxicity Against the Prostate Cancer Cell Line PC3: A Bioassay-guided Isolation and Identification of Arbutin and Betulinic Acid Methyl Ester. Turk J Pharm Sci 2021. [DOI: 10.4274/tjps.galenos.2021.79353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Ismail FMD, Nahar L, Sarker SD. Application of INADEQUATE NMR techniques for directly tracing out the carbon skeleton of a natural product. Phytochem Anal 2021; 32:7-23. [PMID: 32671944 DOI: 10.1002/pca.2976] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION Nuclear magnetic resonance (NMR) measurement of 1 JCC coupling by two-dimensional (2D) INADEQUATE (incredible natural abundance double quantum transfer experiment), which is a special case of double-quantum (DQ) spectroscopy that offers unambiguous determination of 13 C-13 C spin-spin connectivities through the DQ transitions of the spin system, is especially suited to solving structures rich in quaternary carbons and poor in hydrogen content (Crews rule). OBJECTIVE To review published literature on the application of NMR methods to determine structure in the liquid-state, which specifically considers the interaction of a pair of carbon-13 (13 C) nuclei adjacent to one another, to allow direct tracing out of contiguous carbon connectivity using 2D INADEQUATE. METHODOLOGY A comprehensive literature search was implemented with various databases: Web of Knowledge, PubMed and SciFinder, and other relevant published materials including published monographs. The keywords used, in various combinations, with INADEQUATE being present in all combinations, in the search were 2D NMR, 1 JCC coupling, natural product, structure elucidation, 13 C-13 C connectivity, cryoprobe and CASE (computer-assisted structure elucidation)/PANACEA (protons and nitrogen and carbon et alia). RESULTS The 2D INADEQUATE continues to solve "intractable" problems in natural product chemistry, and using milligram quantities with cryoprobe techniques combined with CASE/PANACEA experiments can increase machine time efficiency. The 13 C-13 C-based structural elucidation by dissolution single-scan dynamic nuclear polarisation NMR can overcome disadvantages of 13 C insensitivity at natural abundance. Selected examples have demonstrated the trajectory of INADEQUATE spectroscopy from structural determination to clarification of metabolomics analysis and use of DFT (density functional theory) and coupling constants to clarify the connectivity, hybridisation and stereochemistry within natural products. CONCLUSIONS Somewhat neglected over the years because of perceived lack of sensitivity, the 2D INADEQUATE NMR technique has re-emerged as a useful tool for solving natural products structures, which are rich in quaternary carbons and poor in hydrogen content.
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Affiliation(s)
- Fyaz M D Ismail
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, Merseyside, L3 3AF, UK
| | - Lutfun Nahar
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, Merseyside, L3 3AF, UK
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Olomouc, Czech Republic
| | - Satyajit D Sarker
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool, Merseyside, L3 3AF, UK
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Nahar L, Talukdar AD, Nath D, Nath S, Mehan A, Ismail FMD, Sarker SD. Naturally Occurring Calanolides: Occurrence, Biosynthesis, and Pharmacological Properties Including Therapeutic Potential. Molecules 2020; 25:E4983. [PMID: 33126458 PMCID: PMC7663239 DOI: 10.3390/molecules25214983] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/23/2020] [Accepted: 10/26/2020] [Indexed: 12/11/2022] Open
Abstract
Calanolides are tetracyclic 4-substituted dipyranocoumarins. Calanolide A, isolated from the leaves and twigs of Calophyllum lanigerum var. austrocoriaceum (Whitmore) P. F. Stevens, is the first member of this group of compounds with anti-HIV-1 activity mediated by reverse transcriptase inhibition. Calanolides are classified pharmacologically as non-nucleoside reverse transcriptase inhibitors (NNRTI). There are at least 15 naturally occurring calanolides distributed mainly within the genus Calophyllum, but some of them are also present in the genus Clausena. Besides significant anti-HIV properties, which have been exploited towards potential development of new NNRTIs for anti-HIV therapy, calanolides have also been found to possess anticancer, antimicrobial and antiparasitic potential. This review article provides a comprehensive update on all aspects of naturally occurring calanolides, including their chemistry, natural occurrence, biosynthesis, pharmacological and toxicological aspects including mechanism of action and structure activity relationships, pharmacokinetics, therapeutic potentials and available patents.
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Affiliation(s)
- Lutfun Nahar
- Laboratory of Growth Regulators, Institute of Experimental Botany ASCR & Palacký University, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Anupam Das Talukdar
- Department of Life Science and Bioinformatics, Assam University, Silchar, Assam 788011, India;
| | - Deepa Nath
- Department of Botany, Gurucharan College, Silchar, Assam 788004, India;
| | - Sushmita Nath
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, UK; (S.N.); (F.M.D.)
| | - Aman Mehan
- School of Clinical Medicine, University of Cambridge, Cambridge CB2 OSP, UK;
| | - Fyaz M. D. Ismail
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, UK; (S.N.); (F.M.D.)
| | - Satyajit D. Sarker
- Centre for Natural Products Discovery, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, UK; (S.N.); (F.M.D.)
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Cerceau CI, Barbosa LCA, Alvarenga ES, Maltha CRA, Ismail FMD. 1 H-NMR and GC for detection of adulteration in commercial essential oils of Cymbopogon ssp. Phytochem Anal 2020; 31:88-97. [PMID: 31359561 DOI: 10.1002/pca.2869] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 06/08/2019] [Accepted: 06/09/2019] [Indexed: 06/10/2023]
Abstract
INTRODUCTION Essential oils of Cymbopogon nardus and C. winterianus have fungicidal, bactericidal, and insect repellent activities. In addition, they are components of fragrances, cosmetics, and household products. The growing demand for essential oils has intensified adulteration practices of such products. OBJECTIVES To evaluate the authenticity and quality of citronella commercial essential oils based on chemical composition [by gas chromatography mass spectrometry (GC-MS)] and the contents of its major constituents [by 1 H-NMR, and gas chromatography with a flame ionisation detector using internal standardisation (GC-IS)]. MATERIALS AND METHODS The chemical composition of essential oil was determined by GC-MS. Major components were quantified by 1 H-NMR and the results compared to those obtained by GC-IS. RESULTS The adulteration of oils was verified by GC and 1 H-NMR. In the pure oils, the results obtained by 1 H-NMR were similar to those obtained by GC-IS for most of the oils. However, in adulterated oils, signal overlap prevented the quantification of citronellol and geraniol by NMR. Importantly, due to dilution with dipropylene glycol it was not possible to quantify citronellal using 1 H-NMR. However, for both pure and adulterated oils, GC-IS method proved successful in quantifying notable constituents. CONCLUSION All the methods used proved efficient in detecting adulteration. However, whilst GC-IS provided quantification of constituents of interest, both in pure and adulterated oils, their quantification by NMR was only possible in non-adulterated samples. None of the oils evaluated presented a composition within the threshold established by British Pharmacopoeia quality standards.
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Affiliation(s)
| | - Luiz C A Barbosa
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, Brazil
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Elson S Alvarenga
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Celia R A Maltha
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Fyaz M D Ismail
- Centre for Natural Products Discovery (CNPD), Medicinal Chemistry & Natural Product Research Group, School of Pharmacy & Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
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Segun PA, Ismail FMD, Ogbole OO, Nahar L, Evans AR, Ajaiyeoba EO, Sarker SD. Acridone alkaloids from the stem bark of Citrus aurantium display selective cytotoxicity against breast, liver, lung and prostate human carcinoma cells. J Ethnopharmacol 2018; 227:131-138. [PMID: 30189240 DOI: 10.1016/j.jep.2018.08.039] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/24/2018] [Accepted: 08/31/2018] [Indexed: 06/08/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Citrus aurantium L. (Rutaceae) is used, either singly or as a part of a polyherbal preparation, in Nigerian traditional medicine for the management of cancer and inflammatory diseases. Currently, there is a dearth of knowledge demonstrating its anticancer potential. AIM OF THE STUDY This study was carried out to determine the in vitro cytotoxicity of the crude extract of the stem bark of C. aurantium, identify and isolate the bioactive constituents and to establish the cytotoxicity of such constituents. MATERIALS AND METHODS The powdered bark of C. aurantium was extracted by MeOH at room temperature (25-34 °C) and the crude extract was partitioned successively, with n-hexane, dichloromethane and methanol. Amongst the fractions, the DCM fraction was the most active and compounds were isolated from this fraction using a combination of chromatographic techniques. The structures of the isolated compounds were elucidated by spectroscopic means (MS, 1D and 2D NMR). The cytotoxicity of the extract, and the isolated compounds were evaluated by the MTT assay against four human cancer cell lines: A549 (lung), HepG2 (liver), MCF7 (breast) and PC3 (prostate). The selectivity of the isolated compounds was assessed using the normal human prostate epithelium cells (PNT2). RESULTS AND DISCUSSION Of the three plant fractions, the DCM fraction showed significant cytotoxicity, with its highest activity against A549 cells (IC50 = 3.88 µg/mL) and the least activity on HepG2 cells (IC50 = 5.73 µg/mL). Six acridone alkaloids, citrusinine-I (1), citracridone-I (2), 5-hydroxynoracronycine (3), natsucitrine-I (4), glycofolinine (5) and citracridone-III (6), were isolated from the DCM fraction of C. aurantium. The isolated compounds demonstrated potent to moderate cytotoxicity (IC50 = 12.65-50.74 µM) against the cancer cells under investigation. It is noteworthy that the compounds exerted cytotoxicity at least four times more selective towards the carcinoma cells than the PNT2 cells. CONCLUSION The results obtained from this study have provided some evidence for the ethnomedicinal use of C. aurantium against cancer and the acridone alkaloids present in its stem bark, have appeared to be responsible for the anticancer effects.
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Affiliation(s)
- Peter A Segun
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria; Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom; Department of Pharmacognosy, Faculty of Pharmacy, Olabisi Onabanjo University, Sagamu Campus, Nigeria.
| | - Fyaz M D Ismail
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom.
| | - Omonike O Ogbole
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria.
| | - Lutfun Nahar
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom.
| | - Andrew R Evans
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom.
| | - Edith O Ajaiyeoba
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria.
| | - Satyajit D Sarker
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, United Kingdom.
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Segun PA, Ogbole OO, Ismail FMD, Nahar L, Evans AR, Ajaiyeoba EO, Sarker SD. Resveratrol derivatives from Commiphora africana (A. Rich.) Endl. display cytotoxicity and selectivity against several human cancer cell lines. Phytother Res 2018; 33:159-166. [PMID: 30346066 DOI: 10.1002/ptr.6209] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 09/13/2018] [Accepted: 09/14/2018] [Indexed: 12/22/2022]
Abstract
Commiphora africana (A. Rich.) Endl. (Burseraceae) is a medicinal plant widely used in Nigerian ethnomedicine. The in vitro cytotoxicity of the stem bark extract of C. africana and isolated cytotoxic compounds was investigated. Three resveratrol derivatives: (E)-resveratrol 3-O-rutinoside (1), 5-methoxy-(E)-resveratrol 3-O-rutinoside (2), and pinostilbene (3), together with 3-hydroxy-5-methoxybenzoic acid (4) were isolated from the methanol fraction of C. africana. Their structures were determined by extensive analysis of their HREIMS and NMR spectra. The cytotoxicity of the isolated compounds against four human carcinoma cells was determined using the MTT assay. Compound 1 displayed the highest antiproliferative effect on the cell lines, with IC50 values of 16.80, 21.74, 17.89, and 17.44 μM, against MCF7, A549, PC3, and HepG2 human cancer cell lines, respectively. In addition, compounds 1-3 showed low toxicity against normal human prostate cell line, with selectivity indices greater than five across the carcinoma cells, indicating that the compounds possess potential in the development of low-toxicity chemotherapeutic agents. These results support the traditional use of this plant in the treatment of cancer.
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Affiliation(s)
- Peter A Segun
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria.,Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK.,Department of Pharmacognosy, Faculty of Pharmacy, Olabisi Onabanjo University, Ago Iwoye, Nigeria
| | - Omonike O Ogbole
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria
| | - Fyaz M D Ismail
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Lutfun Nahar
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Andrew R Evans
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
| | - Edith O Ajaiyeoba
- Department of Pharmacognosy, Faculty of Pharmacy, University of Ibadan, Ibadan, Nigeria
| | - Satyajit D Sarker
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK
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Casino AD, Lukinović V, Bhatt R, Randle LE, Dascombe MJ, Fennell DBJ, Drew MGB, Bell A, Fielding AJ, Ismail FMD. Synthesis, Structural Determination, and Pharmacology of Putative Dinitroaniline Antimalarials. ChemistrySelect 2018. [DOI: 10.1002/slct.201801723] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Alessio del Casino
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores University Byrom Street, Liverpool L3 3AF United Kingdom
| | - Valentina Lukinović
- School of Chemistry and the Photon Science InstituteThe University of Manchester, Manchester M13 9PL United Kingdom
| | - Rakesh Bhatt
- Henkel Loctite Adhesives LtdKelsey House, Wood Lane End Hemel Hempstead, Herts HP2 4RQ United Kingdom
| | - Laura E. Randle
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores University Byrom Street, Liverpool L3 3AF United Kingdom
| | - Michael J. Dascombe
- Faculty of BiologyMedicine and HealthStopford Building The University of Manchester Oxford Road, Manchester M13 9PT United Kingdom
| | - Dr Brian J. Fennell
- School of Genetics and MicrobiologyMoyne InstituteTrinity College, Dublin 2 Ireland
| | - Michael G. B. Drew
- Department of ChemistryUniversity of Reading, Reading, Berks, RG6 6AD United Kingdom
| | - Angus Bell
- School of Genetics and MicrobiologyMoyne InstituteTrinity College, Dublin 2 Ireland
| | - Alistair J. Fielding
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores University Byrom Street, Liverpool L3 3AF United Kingdom
| | - Fyaz M. D. Ismail
- School of Pharmacy and Biomolecular SciencesLiverpool John Moores University Byrom Street, Liverpool L3 3AF United Kingdom
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Khan KM, Nahar L, Mannan A, Arfan M, Khan GA, Al-Groshi A, Evans A, Dempster NM, Ismail FMD, Sarker SD. Liquid Chromatography Mass Spectrometry Analysis and Cytotoxicity of Asparagus adscendens Roots against Human Cancer Cell Lines. Pharmacogn Mag 2018; 13:S890-S894. [PMID: 29491650 PMCID: PMC5822517 DOI: 10.4103/pm.pm_136_17] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 06/03/2017] [Indexed: 11/04/2022] Open
Abstract
BACKGROUND Asparagus adscendens Roxb. (Asparagaceae), is native to the Himalayas. This plant has been used in the prevention and effective treatment of various forms of cancers. OBJECTIVE This paper reports, for the first time, on the cytotoxicity of the methanol (MeOH) extract of the roots of A. adscendens and its solid-phase extraction (SPE) fractions against four human carcinoma cell lines and LC-ESI-QTOF-MS analysis of the SPE fractions. MATERIALS AND METHODS Finely powdered roots of A. adscendens were macerated in methanol and extracted through SPE using gradient solvent system (water: methanol) proceeded for analysis on LC-ESI-QTOF-MS and cytotoxicity against four human carcinoma cell lines: breast (MCF7), liver (HEPG2), lung (A549), and urinary bladder (EJ138), using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide assay. RESULTS The MeOH extract and four SPE fractions exhibited cytotoxicity against all cell lines with the IC50 values ranging from 6 to 79 μg/mL. As observed in other Asparagus species, the presence of saponins and sapogenins in the SPE fractions was evident in the liquid chromatography-mass spectrometry data. CONCLUSION It is reasonable to assume that the cytotoxicity of the MeOH extract of the roots of A. adscendens and its SPE fractions, at least partly, due to the presence of saponins and their aglycones. This suggests that A. adscendens could be exploited as a potential source of cytotoxic compounds with putative anticancer potential. SUMMARY The MeOH extract and all solid-phase extraction (SPE) fractions exhibited various levels of cytotoxicity against all cell lines with the IC50 values ranging from 6 to 79 μg/mLThe presence of saponins and sapogenins in the SPE fractions was evident in the Liquid chromatography-mass spectrometry dataDue to the presence of saponins and their aglycones, suggest that A. adscendens could be exploited as a potential source of cytotoxic compounds with putative anticancer potential. Abbreviation used: SPE: Solid-phase extraction, MCF7: Breast cancer cell line, HEPG2: Liver cancer cell line, A549: Lung liver cancer cell line, EJ138: Urinary bladder cancer cell line, MTT: 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide, LC-MS: Liquid chromatography-mass spectrometry.
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Affiliation(s)
- Kashif Maqbool Khan
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
- Department of Pharmacy, COMSATS Institute of Information Technology, Abbottabad, Pakistan
- Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Lutfun Nahar
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
| | - Abdul Mannan
- Department of Pharmacy, COMSATS Institute of Information Technology, Abbottabad, Pakistan
| | - Muhammad Arfan
- Department of Chemistry, School of Natural Sciences, National University of Science and Technology, Islamabad, Pakistan
| | - Ghazanfar Ali Khan
- Department of Research and Development, Drug Regulatory Authority, Islamabad, Pakistan
| | - Afaf Al-Groshi
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
| | - Andrew Evans
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
| | - Nicola M. Dempster
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
| | - Fyaz M. D. Ismail
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
| | - Satyajit D. Sarker
- School of Pharmacy and Bimolecular Sciences, Medicinal Chemistry and Natural Products Research Group, Liverpool John Moores University, England, UK
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Nurunnabi TR, Nahar L, Al-Majmaie S, Rahman SMM, Sohrab MH, Billah MM, Ismail FMD, Rahman MM, Sharples GP, Sarker SD. Anti-MRSA activity of oxysporone and xylitol from the endophytic fungus Pestalotia sp. growing on the Sundarbans mangrove plant Heritiera fomes. Phytother Res 2017; 32:348-354. [PMID: 29193363 DOI: 10.1002/ptr.5983] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 10/18/2017] [Accepted: 10/20/2017] [Indexed: 11/10/2022]
Abstract
Heritiera fomes Buch.-Ham., a mangrove plant from the Sundarbans, has adapted to a unique habitat, muddy saline water, anaerobic soil, brackish tidal activities, and high microbial competition. Endophytic fungal association protects this plant from adverse environmental conditions. This plant is used in Bangladeshi folk medicine, but it has not been extensively studied phytochemically, and there is hardly any report on investigation on endophytic fungi growing on this plant. In this study, endophytic fungi were isolated from the surface sterilized cladodes and leaves of H. fomes. The antimicrobial activities were evaluated against two Gram-positive and two Gram-negative bacteria and the fungal strain, Candida albicans. Extracts of Pestalotia sp. showed activities against all test bacterial strains, except that the ethyl acetate extract was inactive against Escherichia coli. The structures of the purified compounds, oxysporone and xylitol, were elucidated by spectroscopic means. The anti-MRSA potential of the isolated compounds were determined against various MRSA strains, that is, ATCC 25923, SA-1199B, RN4220, XU212, EMRSA-15, and EMRSA-16, with minimum inhibitory concentration values ranging from 32 to 128 μg/ml. This paper, for the first time, reports on the anti-MRSA property of oxysporone and xylitol, isolation of the endophyte Pestalotia sp. from H. fomes, and isolation of xylitol from a Pestalotia sp.
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Affiliation(s)
- Tauhidur Rahman Nurunnabi
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK.,Biotechnology and Genetic Engineering Discipline, Khulna University, Khulna, Bangladesh
| | - Lutfun Nahar
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK
| | - Shaymaa Al-Majmaie
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK
| | - S M Mahbubur Rahman
- Biotechnology and Genetic Engineering Discipline, Khulna University, Khulna, Bangladesh
| | - Md Hossain Sohrab
- Pharmaceutical Sciences Research Division, BCSIR Laboratories, Dhaka, Bangladesh
| | - Md Morsaline Billah
- Biotechnology and Genetic Engineering Discipline, Khulna University, Khulna, Bangladesh
| | - Fyaz M D Ismail
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK
| | - M Mukhlesur Rahman
- Medicine Research Group, School of Health Sport and Bioscience, University of East London, Water Lane, London, E15 4LZ, UK
| | - George P Sharples
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK
| | - Satyajit D Sarker
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool, L3 3AF, UK
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Fielding AJ, Lukinović V, Evans PG, Alizadeh-Shekalgourabi S, Bisby RH, Drew MGB, Male V, Del Casino A, Dunn JF, Randle LE, Dempster NM, Nahar L, Sarker SD, Cantú Reinhard FG, de Visser SP, Dascombe MJ, Ismail FMD. Modulation of Antimalarial Activity at a Putative Bisquinoline Receptor In Vivo Using Fluorinated Bisquinolines. Chemistry 2017; 23:6811-6828. [DOI: 10.1002/chem.201605099] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Alistair J. Fielding
- School of Chemistry and the Photon Science Institute; The University of Manchester; Manchester M13 9PL UK
| | - Valentina Lukinović
- School of Chemistry and the Photon Science Institute; The University of Manchester; Manchester M13 9PL UK
| | - Philip G. Evans
- Peakdale Molecular Limited; Discovery Park, Sandwich Kent CT13 9FF UK
| | | | - Roger H. Bisby
- Biomedical Sciences Research Institute; University of Salford; Salford M5 4WT UK
| | - Michael G. B. Drew
- School of Chemistry; The University of Reading, Whiteknights; Reading RG6 6AD UK
| | - Verity Male
- School of Chemistry; The University of Reading, Whiteknights; Reading RG6 6AD UK
| | - Alessio Del Casino
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - James F. Dunn
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - Laura E. Randle
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - Nicola M. Dempster
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - Lutfun Nahar
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - Satyajit D. Sarker
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
| | - Fabián G. Cantú Reinhard
- Manchester Institute of Biotechnology; School of Chemical Engineering and Analytical Science; The University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Sam P. de Visser
- Manchester Institute of Biotechnology; School of Chemical Engineering and Analytical Science; The University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Mike J. Dascombe
- Faculty of Biology, Medicine and Health, Stopford Building 1.124; The University of Manchester; Oxford Road Manchester M13 9PT UK
| | - Fyaz M. D. Ismail
- Medicinal Chemistry and Natural Products Research Group; School of Pharmacy and Biomolecular Sciences; Liverpool John Moores University; Byrom Street Liverpool L3 3AF UK
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Khan KM, Nahar L, Al-Groshi A, Zavoianu AG, Evans A, Dempster NM, Wansi JD, Ismail FMD, Mannan A, Sarker SD. Cytotoxicity of the Roots ofTrillium govanianumAgainst Breast (MCF7), Liver (HepG2), Lung (A549) and Urinary Bladder (EJ138) Carcinoma Cells. Phytother Res 2016; 30:1716-1720. [DOI: 10.1002/ptr.5672] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Revised: 05/27/2016] [Accepted: 06/02/2016] [Indexed: 01/16/2023]
Affiliation(s)
- Kashif M. Khan
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
- Department of Pharmacy; COMSATS Institute of Information Technology; Abbottabad 22060 Pakistan
| | - Lutfun Nahar
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Afaf Al-Groshi
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Alexandra G. Zavoianu
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Andrew Evans
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Nicola M. Dempster
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Jean D. Wansi
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Fyaz M. D. Ismail
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
| | - Abdul Mannan
- Department of Pharmacy; COMSATS Institute of Information Technology; Abbottabad 22060 Pakistan
| | - Satyajit D. Sarker
- Medicinal Chemistry and Natural Products Research Group, School of Pharmacy and Biomolecular Sciences, Faculty of Science; Liverpool John Moores University; James Parsons Building, Byrom Street Liverpool L3 3AF UK
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Abstract
Promising examples of the phosphoramidates, which possess antiviral, antitumor, antibacterial, antimalarial and anti-protozoal as well as enzyme inhibitor activity are reviewed.
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Affiliation(s)
| | - Luiz C. A. Barbosa
- Department of Chemistry
- Universidade Federal de Viçosa
- Viçosa, Brazil
- Department of Chemistry
- Universidade Federal de Minas Gerais
| | - Fyaz M. D. Ismail
- Medicinal Chemistry Research Group
- Institute for Health Research
- School of Pharmacy & Biomolecular Sciences
- Liverpool John Moores University
- Liverpool, UK
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Barbosa LCA, Maltha CRA, Cusati RC, Teixeira RR, Rodrigues FF, Silva AA, Drew MGB, Ismail FMD. Synthesis and biological evaluation of new ozonides with improved plant growth regulatory activity. J Agric Food Chem 2009; 57:10107-10115. [PMID: 19886678 DOI: 10.1021/jf902540z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The iron oxyallyl carbocation generated from 2,7-dibromocycloheptanone was induced to undergo [4 + 3] cycloaddition reactions with various furans, affording a series of 12-oxatricyclo-[4.4.1.1(2,5)]-dodec-3-en-11-one adducts. Similar methodology was used to prepare two additional cycloadducts using menthofuran and two homologous aliphatic dibromoketones. Dipolar cycloaddition of ozone to the adducts afforded the corresponding secondary ozonides (i.e., 1,2,4-trioxolanes) in variable yields. Ozonides were investigated by quantum mechanics at the B3LYP/6-31+G* level to study structural features including close contacts which may be responsible for enhancing ozonide stability. The effect of these ozonides and their corresponding precursor cycloadducts upon radicle growth of both Sorghum bicolor and Cucumis sativus was evaluated at 5.0 x 10(-4) mol L(-1). The most active cycloadducts and ozonides were also evaluated against the weed species Ipomoea grandifolia and Brachiaria decumbens, and the results are discussed. Compared to ozonides previously synthesized in our laboratory, the new ozonides described herein present improved plant growth regulatory activity.
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Affiliation(s)
- Luiz C A Barbosa
- Department of Chemistry, ederal University of Vic-osa, Avenida P.H. Rolfs, CEP 36570-000, Vic-osa, MG, Brazil.
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Ismail FMD, Drew MGB, Navaratnam S, Bisby RH. A pulse radiolysis study of free radicals formed by one-electron oxidation of the antimalarial drug pyronaridine. Res Chem Intermed 2009. [DOI: 10.1007/s11164-009-0051-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ismail FMD, Levitsky DO, Dembitsky VM. Aziridine alkaloids as potential therapeutic agents. Eur J Med Chem 2009; 44:3373-87. [PMID: 19540628 DOI: 10.1016/j.ejmech.2009.05.013] [Citation(s) in RCA: 161] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2008] [Revised: 05/13/2009] [Accepted: 05/14/2009] [Indexed: 10/20/2022]
Abstract
The present review describes research on natural aziridine alkaloids isolated from both terrestrial and marine species, as well as their lipophilic semi-synthetic, and/or synthetic analogs. Over 130 biologically active aziridine-containing compounds demonstrate confirmed pharmacological activity including antitumor, antimicrobial, antibacterial effects. The structures, origin, and biological activities of aziridine alkaloids are reviewed. Consequently this review emphasizes the role of aziridine alkaloids as an important source of drug prototypes and leads for drug discovery.
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Affiliation(s)
- Fyaz M D Ismail
- Medicinal Chemistry Research Group, Department of Pharmacy and Chemistry, Liverpool John Moores University, 221C Phase 1, Byrom Street, Liverpool, Merseyside L3 3AF, UK
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Silva CJ, Barbosa LCA, Maltha CRA, Pinheiro AL, Ismail FMD. Comparative study of the essential oils of sevenMelaleuca (Myrtaceae) species grown in Brazil. FLAVOUR FRAG J 2007. [DOI: 10.1002/ffj.1823] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Drew MGB, Metcalfe J, Dascombe MJ, Ismail FMD. Reactions of Artemisinin and Arteether with Acid: Implications for Stability and Mode of Antimalarial Action. J Med Chem 2006; 49:6065-73. [PMID: 17004720 DOI: 10.1021/jm060673d] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The currently accepted mechanism of trioxane antimalarial action involves generation of free radicals within or near susceptible sites probably arising from the production of distonic radical anions. An alternative mechanistic proposal involving the ionic scission of the peroxide group and consequent generation of a carbocation at C-4 has been suggested to account for antimalarial activity. We have investigated this latter mechanism using DFT (B3LYP/6-31+G* level) and established the preferred Lewis acid protonation sites (artemisinin O5a>>O4a approximately O3a>O2a>O1a; arteether O4a>or=O3a>O5b>>O2a>O1a; Figure 3) and the consequent decomposition pathways and hydrolysis sites. In neither molecule is protonation likely to occur on the peroxide bond O1-O2 and therefore lead to scission. Therefore, the alternative radical pathway remains the likeliest explanation for antimalarial action.
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Affiliation(s)
- Michael G B Drew
- Department of Chemistry, University of Reading, Reading RG6 6AD, UK
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Dascombe MJ, Drew MGB, Morris H, Wilairat P, Auparakkitanon S, Moule WA, Alizadeh-Shekalgourabi S, Evans PG, Lloyd M, Dyas AM, Carr P, Ismail FMD. Mapping Antimalarial Pharmacophores as a Useful Tool for the Rapid Discovery of Drugs Effective in Vivo: Design, Construction, Characterization, and Pharmacology of Metaquine. J Med Chem 2005; 48:5423-36. [PMID: 16107142 DOI: 10.1021/jm0408013] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Resistant strains of Plasmodium falciparum and the unavailability of useful antimalarial vaccines reinforce the need to develop new efficacious antimalarials. This study details a pharmacophore model that has been used to identify a potent, soluble, orally bioavailable antimalarial bisquinoline, metaquine (N,N'-bis(7-chloroquinolin-4-yl)benzene-1,3-diamine) (dihydrochloride), which is active against Plasmodium berghei in vivo (oral ID(50) of 25 micromol/kg) and multidrug-resistant Plasmodium falciparum K1 in vitro (0.17 microM). Metaquine shows strong affinity for the putative antimalarial receptor, heme at pH 7.4 in aqueous DMSO. Both crystallographic analyses and quantum mechanical calculations (HF/6-31+G) reveal important regions of protonation and bonding thought to persist at parasitic vacuolar pH concordant with our receptor model. Formation of drug-heme adduct in solution was confirmed using high-resolution positive ion electrospray mass spectrometry. Metaquine showed strong binding with the receptor in a 1:1 ratio (log K = 5.7 +/- 0.1) that was predicted by molecular mechanics calculations. This study illustrates a rational multidisciplinary approach for the development of new 4-aminoquinoline antimalarials, with efficacy superior to chloroquine, based on the use of a pharmacophore model.
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Affiliation(s)
- Michael J Dascombe
- Faculty of Life Sciences, Stopford Building 1.124, The University of Manchester, Oxford Road, Manchester M13 9PT, U.K.
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