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Deshapriya US, Dinuka DLS, Ratnaweera PB, Ratnaweera CN. In silico study for prediction of novel bioactivities of the endophytic fungal alkaloid, mycoleptodiscin B for human targets. J Mol Graph Model 2020; 102:107767. [PMID: 33130394 DOI: 10.1016/j.jmgm.2020.107767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 06/17/2020] [Revised: 09/23/2020] [Accepted: 09/28/2020] [Indexed: 11/28/2022]
Abstract
Mycoleptodiscin B is a natural product extracted from the endophytic fungus Mycoleptodiscus sp. found in Sri Lanka and Panama with experimentally unexplored activities for human targets. In this study, a computational methodology was applied to determine druggable targets of mycoleptodiscin B. According to the computational toxicity and pharmacokinetics assessment, mycoleptodiscin B was proven to be a suitable drug candidate. Druggable targets for this compound, aromatase, acidic plasma glycoprotein and androgen receptor, were predicted using reverse docking. A two-step validation of those targets was performed using conventional molecular docking and molecular dynamic (MD) simulations, resulting in aromatase being determined as the potential therapeutic target. Based on molecular mechanics/Generalized Born Surface Area (GBSA) free energies and ligand stability inside the active site cavity during its 120 ns MD run, it can be concluded that mycoleptodiscin B is a potent aromatase inhibitor and could be subjected to further in vitro and in vivo experiments in the drug development pipeline. Consequently, natural product chemists can quickly identify the hidden medicinal properties of their miracle compounds using the computational approach applied in this research.
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Affiliation(s)
- Uthpala S Deshapriya
- College of Chemical Sciences, Institute of Chemistry Ceylon, Rajagiriya, Sri Lanka; Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
| | - D L Senal Dinuka
- College of Chemical Sciences, Institute of Chemistry Ceylon, Rajagiriya, Sri Lanka; Department of Chemistry, Mississippi State University, Mississippi State, USA
| | - Pamoda B Ratnaweera
- Department of Science and Technology, Faculty of Applied Sciences, Uva Wellassa University, Badulla, Sri Lanka
| | - Chinthaka N Ratnaweera
- College of Chemical Sciences, Institute of Chemistry Ceylon, Rajagiriya, Sri Lanka; Department of Chemistry, University of Ruhuna, Matara, Sri Lanka.
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Ratnaweera PB, M Jayasundara JMN, Herath HHMSD, Williams DE, Rajapaksha SU, Nishantha KMDWP, de Silva ED, Andersen RJ. Antifeedant, contact toxicity and oviposition deterrent effects of phyllostine acetate and phyllostine isolated from the endophytic fungus Diaporthe miriciae against Plutella xylostella larvae. Pest Manag Sci 2020; 76:1541-1548. [PMID: 31696600 DOI: 10.1002/ps.5673] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 06/22/2019] [Revised: 11/01/2019] [Accepted: 11/04/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Larvae of the diamond back moth (DBM), Plutella xylostella, are destructive cabbage pests causing economic losses worldwide. Continuous application of synthetic pesticides to control this pest has resulted in environmental pollution and resistant pest strains. Thus, there is a crucial need to seek natural alternatives with minimal detrimental effects. This study was designed to investigate the antifeedant activities of endophytic fungi of Cyperus iria and to determine the antifeedant, contact toxicity and oviposition deterrent activities of phyllostine acetate and phyllostine of the endophytic Diaporthe miriciae fungus. RESULTS Two cyclohexeneoxidediones, phyllostine acetate (1) and phyllostine (2), isolated from an ethyl acetate extract of D. miriciae exhibited strong antifeedant, contact toxicity, and oviposition deterrent activities against P. xylostella. Phyllostine acetate (1) and phyllostine (2) showed feeding deterrent indexes of 100% at 50 μg cm-2 in the no-choice leaf disc assay and 50% feeding deterrence (DC50 ) values of 9 and 4.7 μg cm-2 respectively. The median lethal concentration (LC50 ) values of phyllostine acetate (1) and phyllostine (2) were 4.38 and 6.54 μg/larva in the contact toxicity assay. The oviposition deterrent indexes of the two compounds were 100% for phyllostine acetate (1) and 28.6% for phyllostine (2) at 50 μg cm-2 . CONCLUSION Phyllostine acetate and phyllostine show promise as compounds for the control of P. xylostella. This study encourages further investigation of endophytic fungi of the family Cyperacea, for the development of natural pest control agents in agriculture. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Pamoda B Ratnaweera
- Department of Science and Technology, Uva Wellassa University, Badulla, Sri Lanka
| | | | | | - David E Williams
- Departments of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
| | - Sasini U Rajapaksha
- Department of Science and Technology, Uva Wellassa University, Badulla, Sri Lanka
| | - K M D W Prabath Nishantha
- Horticultural Crop Research Development Institute (HORDI), Department of Agriculture, Gannoruwa, Peradeniya, Sri Lanka
| | - E Dilip de Silva
- Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Colombo, Sri Lanka
| | - Raymond J Andersen
- Departments of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
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Ratnaweera PB, Walgama RC, Jayasundera KU, Herath SD, Abira S, Williams DE, Andersen RJ, De Silva ED. Antibacterial activities of endophytic fungi isolated from six Sri Lankan plants of the family Cyperaceae. BANGL J PHARMACOL 2018. [DOI: 10.3329/bjp.v13i3.36716] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
<p class="Abstract">In a study designed to determine the antibacterial potential of endophytic fungi inhabiting plants of Cyperaceae family, 72 morphologically distinct endophytic fungi were isolated from six plants and their antibacterial activities against two Gram positive and three Gram negative pathogenic bacterial species were examined. Two antibacterial metabolites from two endophytes were also isolated and their chemical structures and minimum inhibitory concentrations were determined. Sixty six fungal extracts (92%) were active against at least one bacterium tested. Butyrolactone I isolated from the Aspergillus terreus and 9-epi viridol isolated from Trichoderma virens exhibited MIC values in the range 128-256 µg/mL against Gram positive Bacillus subtilits, Staphylococcus aureus, methicillin resistant S. aureus (MRSA) and Escherichia coli. Both compounds were inactive against other micro-organisms tested. This study confirmed that Cyperaceae plants harbor numerous endophytes that produce antibacterial metabolites active against both Gram positive and, to a lesser extent, Gram negative bacteria.</p><p><strong>Video Clip of Methodology:</strong></p><p>Column Chromatogrpahy: 15 min 34 sec <a href="https://www.youtube.com/v/CqF3GmhSHN4">Full Screen</a> <a href="https://www.youtube.com/watch?v=CqF3GmhSHN4">Alternate</a></p>
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Williams DE, Gunasekara NW, Ratnaweera PB, Zheng Z, Ellis S, Dada S, Patrick BO, Wijesundera RLC, Nanayakkara CM, Jefferies WA, de Silva ED, Andersen RJ. Serpulanines A to C, N-Oxidized Tyrosine Derivatives Isolated from the Sri Lankan Fungus Serpula sp.: Structure Elucidation, Synthesis, and Histone Deacetylase Inhibition. J Nat Prod 2018; 81:78-84. [PMID: 29303267 DOI: 10.1021/acs.jnatprod.7b00680] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Serpulanines A (1), B (2), and C (3) have been isolated from extracts of the rare Sri Lankan macrofungus Serpula sp. The structures of 1, 2, and 3 were elucidated by a combination of spectroscopic and single-crystal X-ray diffraction analyses. Serpulanines A (1) and B (2) both contain the rare (E)-2-hydroxyimino hydroxamic acid functional group array. A proposed biogenesis for serpulanine B (2) suggests that its (E)-2-hydroxyimino hydroxamic acid moiety arises from a diketopiperazine precursor. Synthetic serpulanine A (1) inhibited class I/II histone deacetylases in murine metastatic lung carcinoma cells with an IC50 of 7 μM.
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Affiliation(s)
- David E Williams
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Niranjan W Gunasekara
- Departments of Chemistry and Plant Science, University of Colombo , Colombo 03, Sri Lanka
| | - Pamoda B Ratnaweera
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
- Departments of Chemistry and Plant Science, University of Colombo , Colombo 03, Sri Lanka
- Department of Science and Technology, Uva Wellassa University , Badulla, Sri Lanka
| | - Zehua Zheng
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Samantha Ellis
- The Michael Smith Laboratories; Vancouver Prostate Centre; Departments of Medical Genetics, Microbiology & Immunology, and Zoology; and The Centre for Blood Research and Djavad Mowafaghian Centre for Brain Health, University of British Columbia , Vancouver, BC, Canada
| | - Sarah Dada
- The Michael Smith Laboratories; Vancouver Prostate Centre; Departments of Medical Genetics, Microbiology & Immunology, and Zoology; and The Centre for Blood Research and Djavad Mowafaghian Centre for Brain Health, University of British Columbia , Vancouver, BC, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
| | - Ravi L C Wijesundera
- Departments of Chemistry and Plant Science, University of Colombo , Colombo 03, Sri Lanka
| | | | - Wilfred A Jefferies
- The Michael Smith Laboratories; Vancouver Prostate Centre; Departments of Medical Genetics, Microbiology & Immunology, and Zoology; and The Centre for Blood Research and Djavad Mowafaghian Centre for Brain Health, University of British Columbia , Vancouver, BC, Canada
| | - E Dilip de Silva
- Departments of Chemistry and Plant Science, University of Colombo , Colombo 03, Sri Lanka
| | - Raymond J Andersen
- Departments of Chemistry and Earth, Ocean & Atmospheric Sciences, University of British Columbia , 2036 Main Mall, Vancouver, BC, Canada V6T 1Z1
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Ratnaweera PB, Williams DE, Dilip de Silva E, Andersen RJ. Antibacterial Metabolites from the Sri Lankan Demosponge-Derived Fungus, Aspergillus flavipes. CURR SCI INDIA 2016. [DOI: 10.18520/cs/v111/i9/1473-1479] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Dissanayake RK, Ratnaweera PB, Williams DE, Wijayarathne CD, Wijesundera RLC, Andersen RJ, de Silva ED. Antimicrobial activities of endophytic fungi of the Sri Lankan aquatic plant Nymphaea nouchali and chaetoglobosin A and C, produced by the endophytic fungus Chaetomium globosum. Mycology 2016; 7:1-8. [PMID: 30123610 PMCID: PMC6059152 DOI: 10.1080/21501203.2015.1136708] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Accepted: 12/16/2015] [Indexed: 11/10/2022] Open
Abstract
Twenty distinct endophytic fungi were isolated from the surface-sterilized plant parts of Nymphaea nouchali and were identified using morphological and molecular techniques. At 300 µg/disc concentration, eight of the 20 fungal extracts exhibited antimicrobial activities against Staphylococcus aureus (ATCC 25923) and Bacillus cereus (ATCC 11778) while two within the eight showed activity against Pseudomonas aeruginosa (ATCC 9027) and Escherichia coli (ATCC 35218). Furthermore, investigation of the crude extract of Chaetomium globosum resulted in the isolation of two known cytochalasans, chaetoglobosin A and C, and their structures were elucidated and confirmed by mass and nuclear magnetic resonance (NMR) (1H, 13C, COSY, HSQC, HMBC and tROESY) spectral data. Chaetoglobosin A showed antibacterial activities against Bacillus subtilis (MIC 16 µg mL-1), Staphylococcus aureus (MIC 32 µg mL-1) and methicillin-resistant Staphylococcus aureus (MRSA, MIC 32 µg mL-1). This is the first study to report the isolation, identification and antimicrobial properties of endophytic fungi of N. nouchali in Sri Lanka.
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Affiliation(s)
| | - Pamoda B. Ratnaweera
- Department of Chemistry, University of Colombo, Colombo, 03, Sri Lanka
- Departments of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia (UBC), Vancouver, Canada
| | - David E. Williams
- Departments of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia (UBC), Vancouver, Canada
| | | | | | - Raymond J. Andersen
- Departments of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia (UBC), Vancouver, Canada
| | - E. Dilip de Silva
- Department of Chemistry, University of Colombo, Colombo, 03, Sri Lanka
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Ratnaweera PB, de Silva ED, Williams DE, Andersen RJ. Antimicrobial activities of endophytic fungi obtained from the arid zone invasive plant Opuntia dillenii and the isolation of equisetin, from endophytic Fusarium sp. BMC Complement Altern Med 2015; 15:220. [PMID: 26160390 PMCID: PMC4496918 DOI: 10.1186/s12906-015-0722-4] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 06/12/2015] [Indexed: 11/30/2022]
Abstract
Background Opuntia dillenii is an invasive plant well established in the harsh South-Eastern arid zone of Sri Lanka. Evidence suggests it is likely that the endophytic fungal populations of O. dillenii assist the host in overcoming biotic and abiotic stress by producing biologically active metabolites. With this in mind there is potential to discover novel natural products with useful biological activities from this hitherto poorly investigated source. Consequently, an investigation of the antimicrobial activities of the endophytes of O. dillenii, that occupies a unique ecological niche, may well provide useful leads in the discovery of new pharmaceuticals. Methods Endophytic fungi were isolated from the surface sterilized cladodes and flowers of O. dillenii using several nutrient media and the antimicrobial activities were evaluated against three Gram-positive and two Gram-negative bacteria and Candida albicans. The two most bioactive fungi were identified by colony morphology and DNA sequencing. The secondary metabolite of the endophyte Fusarium sp. exhibiting the best activity was isolated via bioassay guided chromatography. The chemical structure was elucidated from the ESIMS and NMR spectroscopic data obtained for the active metabolite. The minimum inhibitory concentrations (MICs) of the active compound were determined. Results Eight endophytic fungi were isolated from O. dillenii and all except one showed antibacterial activities against at least one of the test bacteria. All extracts were inactive against C. albicans. The most bioactive fungus was identified as Fusarium sp. and the second most active as Aspergillus niger. The structure of the major antibacterial compound of the Fusarium sp. was shown to be the tetramic acid derivative, equisetin. The MIC’s for equisetin were 8 μg mL−1 against Bacillus subtilis, 16 μg mL−1 against Staphylococcus aureus and Methicillin Resistant Staphylococcus aureus (MRSA). Conclusions O. dillenii, harbors several endophytic fungi capable of producing antimicrobial substances with selective antibacterial properties. By producing biologically active secondary metabolites, such as equisetin isolated from the endophytic Fusarium sp., the endophytic fungal population may be assisting the host to successfully withstand stressful environmental conditions. Further investigations on the secondary metabolites produced by these endophytes may provide additional drug leads.
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Ratnaweera PB, Williams DE, Patrick BO, de Silva ED, Andersen RJ. Solanioic Acid, an Antibacterial Degraded Steroid Produced in Culture by the Fungus Rhizoctonia solani Isolated from Tubers of the Medicinal Plant Cyperus rotundus. Org Lett 2015; 17:2074-7. [DOI: 10.1021/acs.orglett.5b00596] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pamoda B. Ratnaweera
- Department
of Chemistry, University of Colombo, Colombo 03, Sri Lanka
- Departments
of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1
- Department
of Science and Technology, Uva Wellassa University, Badulla, Sri Lanka
| | - David E. Williams
- Departments
of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1
| | - Brian O. Patrick
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1
| | - E. Dilip de Silva
- Department
of Chemistry, University of Colombo, Colombo 03, Sri Lanka
| | - Raymond J. Andersen
- Departments
of Chemistry and Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2036 Main Mall, Vancouver, B.C., Canada V6T 1Z1
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Ratnaweera PB, Williams DE, de Silva ED, Wijesundera RLC, Dalisay DS, Andersen RJ. Helvolic acid, an antibacterial nortriterpenoid from a fungal endophyte, Xylaria sp. of orchid Anoectochilus setaceus endemic to Sri Lanka. Mycology 2014; 5:23-28. [PMID: 24772371 PMCID: PMC3979440 DOI: 10.1080/21501203.2014.892905] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Accepted: 01/31/2014] [Indexed: 11/17/2022] Open
Abstract
An endophytic fungus was isolated from surface sterilized leaf segments of Anoectochilus setaceus, an orchid endemic to Sri Lanka, and was identified as Xylaria sp. by morphological characters and DNA sequencing. Bioassay-guided chromatographic fractionation of the organic extract of a laboratory culture of this fungus led to the isolation of the known antibacterial helvolic acid. Helvolic acid was active against the Gram-positive bacteria, Bacillus subtilis [minimal inhibitory concentrations (MIC), 2 μg mL−1] and methicillin-resistant Staphylococcus aureus (MIC, 4 μg mL−1).
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Affiliation(s)
- Pamoda B Ratnaweera
- Department of Chemistry, University of Colombo, Colombo 03, Sri Lanka ; Department of Science and Technology, Uva Wellassa University, Badulla, Sri Lanka
| | - David E Williams
- Department of Chemistry and Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | - E Dilip de Silva
- Department of Chemistry, University of Colombo, Colombo 03, Sri Lanka
| | | | - Doralyn S Dalisay
- Department of Chemistry and Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Raymond J Andersen
- Department of Chemistry and Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
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Harvey MS, Ratnaweera PB, Udagama PV, Wijesinghe MR. A new species of the pseudoscorpion genusMegachernes(Pseudoscorpiones: Chernetidae) associated with a threatened Sri Lankan rainforest rodent, with a review of host associations ofMegachernes. J NAT HIST 2012. [DOI: 10.1080/00222933.2012.707251] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ratnaweera PB, Wijesinghe MR, Udagama-Randeniya PV. Parasitic associations of a threatened Sri Lankan rainforest rodent, Mus mayori pococki (Rodentia: Muridae). J Threat Taxa 2010. [DOI: 10.11609/jott.o2194.901-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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