1
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Palasarn S, Pruksatrakul T, Choowong W, Wiriyathanawudhiwong N, Boonpratuang T, Surawatanawong P, Thongpanchang C, Isaka M. Oudemansin and 9-methoxystrobilurin derivatives with antimalarial activity from cultures of the basidiomycete Favolaschia minutissima: assignments of the absolute configurations of the isoprene-derived units. Org Biomol Chem 2023; 21:7944-7953. [PMID: 37740400 DOI: 10.1039/d3ob01472j] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 09/24/2023]
Abstract
Five undescribed polyketide metabolites, oudemansins E (1), M (2), P (3), and Q (4), and 9-methoxystrobilurin I (5), were isolated from cultures of basidiomycete Favolaschia minutissima TBRC-BCC 19434. A γ-lactone derivative (6) of noroudemansin A (8), which was previously reported as a semisynthetic compound, was also isolated. The absolute configuration of the isoprene-derived moiety of the known cometabolite 9-methoxystrobilurin E (9) was determined to be 2'R,6'S by comparison of the experimental and calculated ECD data, which was correlated to the new derivative 1. These compounds exhibited antimalarial activity against Plasmodium falciparum K1 (multidrug-resistant strain). A putative minor natural product, namely 9-methoxystrobilurin P (13), was prepared by semisynthesis, which exhibited significant antimalarial activity (IC50 0.086 μM).
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Affiliation(s)
- Somporn Palasarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
| | - Thapanee Pruksatrakul
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
| | - Wilunda Choowong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
| | - Natthawut Wiriyathanawudhiwong
- National Biobank of Thailand, National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Thitiya Boonpratuang
- National Biobank of Thailand, National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Panida Surawatanawong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
| | - Masahiko Isaka
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
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2
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Hoarau M, Sermmai P, Varatthan T, Thiabma R, Jantra T, Rattanajak R, Vitsupakorn D, Vanichtanankul J, Saepua S, Yuthavong Y, Thongpanchang C, Kamchonwongpaisan S. Discovery of rigid biphenyl Plasmodium falciparum DHFR inhibitors using a fragment linking strategy. RSC Med Chem 2023; 14:1755-1766. [PMID: 37731689 PMCID: PMC10507804 DOI: 10.1039/d3md00242j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 07/24/2023] [Indexed: 09/22/2023] Open
Abstract
Plasmodium falciparum dihydrofolate reductase (PfDHFR), a historical target for antimalarials, has been considered compromised due to resistance inducing mutations caused by pyrimethamine (PYR) overexposure. The clinical candidate P218 has demonstrated that inhibitors could efficiently target both PYR-sensitive and PYR-resistant parasites through careful drug design. Yet, P218 clinical development has been limited by its pharmacokinetic profile, incompatible with single dose regimen. Herein, we report the design of new PfDHFR inhibitors using fragment-based design, aiming at improved lipophilicity and overall drug-like properties. Fragment-based screening identified hits binding in the pABA site of the enzyme. Using structure-guided design, hits were elaborated into leads by fragment linking with 2,4-diaminopyrimidine. Resulting compounds display nM range inhibition of both drug-sensitive and resistant PfDHFR, high selectivity against the human isoform, drug-like lipophilicity and metabolic stability. Compound 4 and its ester derivative 3 kill blood stage TM4/8.2 parasite at nM concentrations while showing no toxicity against Vero cells.
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Affiliation(s)
- Marie Hoarau
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Patpanat Sermmai
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Thaveechai Varatthan
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Ratthiya Thiabma
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Tararat Jantra
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Roonglawan Rattanajak
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Danoo Vitsupakorn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Jarunee Vanichtanankul
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Siriporn Saepua
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Yongyuth Yuthavong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
| | - Sumalee Kamchonwongpaisan
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency Pathum Thani 12120 Thailand
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3
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Chinthanom P, Dokladda K, Vichai V, Choeyklin R, Thongpanchang C, Isaka M. Chemical analysis and antitubercular activity evaluation of the dried mycelial powders of the basidiomycete Ganoderma australe TBRC-BCC 22314. Fitoterapia 2023; 169:105597. [PMID: 37380134 DOI: 10.1016/j.fitote.2023.105597] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/21/2023] [Accepted: 06/23/2023] [Indexed: 06/30/2023]
Abstract
The isolation of lanostane triterpenoids possessing significant anti-tuberculosis (anti-TB) activity from mycelial cultures of the basidiomycete Ganoderma australe strain TBRC-BCC 22314 was previously reported. To demonstrate the potential of the dried mycelial powder for utilization in anti-TB medicinal products, its authentic chemical analysis was performed. Considering the possibility of the changes in the lanostane compositions and anti-TB activity by sterilization, both autoclave treated and non-autoclaved mycelial powder materials were chemically investigated. The study led to the identification of the lanostanes responsible for the activity of the mycelial extract against Mycobacterium tuberculosis H37Ra. The anti-TB activity of the extracts from autoclaved and non-autoclaved mycelial powders were the same (MIC 3.13 μg/mL). However, the analytical results revealed several unique chemical conversions of the lanostanes under the sterilization conditions. The most potent major lanostane, ganodermic acid S (1), was shown to be significantly active also against the extensively drug-resistant (XDR) strains of M. tuberculosis.
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Affiliation(s)
- Panida Chinthanom
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Kanchana Dokladda
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Vanicha Vichai
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Rattaket Choeyklin
- National Biobank of Thailand (NBT), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Masahiko Isaka
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 111 Thailand Science Park, Phahonyothin Road, Klong Luang, Pathumthani 12120, Thailand.
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Yangchum A, Rachtawee P, Srichomthong K, Choeyklin R, Boonpratuang T, Thongpanchang C, Isaka M. Lanostane triterpenoids from artificially cultivated fruiting bodies of Ganoderma cf. mastoporum. Nat Prod Res 2023:1-9. [PMID: 37039449 DOI: 10.1080/14786419.2023.2196723] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
In the quest for bioactive compounds from Ganoderma, artificially cultivated fruiting bodies of Ganoderma cf. mastoporum, strain TBRC-BCC 47851 were chemically investigated. The study led to the isolation of three undescribed lanostane triterpenoids (1-3) together with twelve known compounds. The structures were elucidated on the basis of NMR spectroscopic and mass spectrometry data. The new compounds were inactive in the antimalarial and antitubercular activity assays.
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Affiliation(s)
- Arunrat Yangchum
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Pranee Rachtawee
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Kitlada Srichomthong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | | | | | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Masahiko Isaka
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
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5
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Kornsakulkarn J, Auncharoen P, Khonsanit A, Boonyuen N, Thongpanchang C. Cytotoxic cytochalasans from cultures of the fungus Metarhizium brunneum TBRC-BCC 79240. RSC Adv 2023; 13:10564-10576. [PMID: 37025662 PMCID: PMC10071300 DOI: 10.1039/d3ra00042g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 03/28/2023] [Indexed: 04/08/2023] Open
Abstract
Fourteen new cytochalasans, brunnesins A-N (1-14), along with eleven known compounds, were isolated from the culture extracts of the insect pathogenic fungus Metarhizium brunneum strain TBRC-BCC 79240. The compound structures were established by spectroscopy, X-ray diffraction analysis, and electronic circular dichroism. Compound 4 exhibited antiproliferative activity against all cell lines tested (mammalian), with 50% inhibition concentration (IC50) values ranging from 2.09 to 16.8 μg mL-1. Compounds 6 and 16 were shown to be bioactive only against non-cancerous Vero cells (IC50 4.03 and 0.637 μg mL-1, respectively) whereas compounds 9 and 12 were bioactive only against NCI-H187 small-cell lung cancer cells (IC50 18.59 and 18.54 μg mL-1, respectively). Compounds 7, 13, and 14 showed cytotoxicity against NCI-H187 and Vero cell lines with IC50 values ranging from 3.98-44.81 μg mL-1.
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Affiliation(s)
- Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) 111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang Pathum Thani 12120 Thailand
| | - Patchanee Auncharoen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) 111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang Pathum Thani 12120 Thailand
| | - Artit Khonsanit
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) 111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang Pathum Thani 12120 Thailand
| | - Nattawut Boonyuen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) 111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang Pathum Thani 12120 Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA) 111 Thailand Science Park, Phahonyothin Road, Khlong Nueng, Khlong Luang Pathum Thani 12120 Thailand
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6
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Nithimanon S, Sermmai P, Thongpanchang C, Saepua S, Thongpanchang T. Crystal structure of anabolic steroid metabolite 4-chloroandrost-4-ene-3,17-dione. Acta Crystallogr E Crystallogr Commun 2022. [DOI: 10.1107/s2056989022010891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The title compound, NorClAD, C18H23ClO2, a metabolite of an anabolic steroid norchlorotestosterone acetate (NClTA), was successfully synthesized. Its molecular structure was characterized by 1H NMR and 13C NMR spectroscopy and single-crystal X-ray diffraction. The positions of the chlorine substituent, carbonyl groups and the double bond, as well as the absolute configuration of the molecule, were established. A Hirshfeld surface analysis was performed.
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7
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Thongpanchang T, Dolsophon K, Soponpong J, Kornsakulkarn J, Thongpanchang C. Methods for Determination of Absolute Configurations of Chiral Diols by THENA Ester and NMR Shift Difference. Synlett 2022. [DOI: 10.1055/s-0041-1737992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AbstractDetermination of the absolute configuration of chiral secondary diols by chiral derivatizing agent (CDA) and NMR shift difference is of great challenge due to the complication from the interference of the aromatic anisotropic shielding effect of the two CDAs in close proximity. In this work, tetrahydro-1,4-epoxynaphthalene-1-carboxylic acid (THENA) was introduced as an alternative CDA for diols to overcome such complexity. Since the deshielding effect of THENA is weaker than the shielding effect of other CDAs, THENA would allow the direct analysis of the chemical shift difference in determining the absolute configuration of the chiral diols. In addition, an analytical method based on Riguera’s model could also be used to confirm the assignment. With a good agreement between the assigned configuration based on both analytical models, the absolute configuration of the chiral diols could be assigned with reliability.
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Affiliation(s)
- Tienthong Thongpanchang
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University
| | - Kulvadee Dolsophon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University
| | - Jakapun Soponpong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University
| | - Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency
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8
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Saepua S, Kornsakulkarn J, Choowong W, Suriyachadkun C, Boonlarppradab C, Thongpanchang C. Antimicrobial and Cytotoxic Angucyclic Quinones from Actinomadura miaoliensis. J Nat Prod 2021; 84:2775-2785. [PMID: 34748348 DOI: 10.1021/acs.jnatprod.1c00232] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Eight new angucyclic quinones, miaosporones A to H (1-8), along with the previously described metabolites 8-hydroxy-3-methylbenz[a]anthraquinone (9), tetrangulol (10), 5,6-dihydro-1,8-dihydroxy-3-methybenz[a]anthracene-7,12-quinone (11), and SF2315A (12), were isolated from the terrestrial actinomycete Actinomadura miaoliensis TBRC 5172 obtained from sediment collected from the Huai Yang reservoir, Prachuap Khiri Khan Province, Thailand. The relative and absolute configurations of the new compounds were determined from analysis of NMR spectroscopic and X-ray crystallographic data. Miaosporone A exhibited antimalarial activity against Plasmodium falciparum K1 and antibacterial activity against Mycobacterium tuberculosis with respective IC50 values of 2.5 and 2.4 μM and displayed cytotoxic activities against both cancerous (MCF-7 and NCI-H187) and nonmalignant (Vero) cells.
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Affiliation(s)
- Siriporn Saepua
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Wilunda Choowong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chanwit Suriyachadkun
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chollaratt Boonlarppradab
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Road, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani 12120, Thailand
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9
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Chinthanom P, Vichai V, Dokladda K, Sappan M, Thongpanchang C, Isaka M. Semisynthetic modifications of antitubercular lanostane triterpenoids from Ganoderma. J Antibiot (Tokyo) 2021; 74:435-442. [PMID: 33981028 PMCID: PMC8113785 DOI: 10.1038/s41429-021-00422-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 01/19/2021] [Revised: 03/05/2021] [Accepted: 03/24/2021] [Indexed: 11/09/2022]
Abstract
Antitubercular lanostane triterpenoids isolated from mycelial cultures of the basidiomycete Ganoderma australe were structurally modified by semisynthesis. One of the synthetic compounds, named GA003 (9), showed more potent activity against Mycobacterium tuberculosis H37Ra than the lead natural lanostane (1). GA003 was also significantly active against the virulent strain (H37Rv) as well as extensively drug-resistant tuberculosis strains.
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Affiliation(s)
- Panida Chinthanom
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Vanicha Vichai
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Kanchana Dokladda
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Malipan Sappan
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand
| | - Masahiko Isaka
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Klong Luang, Pathumthani, Thailand.
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10
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Tiyasakulchai T, Charoensetakul N, Khamkhenshorngphanuch T, Thongpanchang C, Srikun O, Yuthavong Y, Srimongkolpithak N. Scalable synthesis of favipiravir via conventional and continuous flow chemistry. RSC Adv 2021; 11:38691-38693. [PMID: 35493228 PMCID: PMC9044180 DOI: 10.1039/d1ra06963b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 11/12/2021] [Indexed: 11/21/2022] Open
Abstract
Decagram scale synthesis of favipiravir was performed in 9 steps using diethyl malonate as cheap starting material. Hydrogenation and bromination steps were achieved by employing a continuous flow reactor. The synthetic process provided a total of 16% yield and it is suitable for larger-scale synthesis and production. Decagram scale synthesis of favipiravir was performed in 9 steps using diethyl malonate as cheap starting material.![]()
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Affiliation(s)
- Thanat Tiyasakulchai
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, Thailand
| | - Netnapa Charoensetakul
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, Thailand
| | | | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, Thailand
| | - Onsiri Srikun
- Government Pharmaceutical Organization (GPO), Bangkok, Thailand
| | - Yongyuth Yuthavong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, Thailand
| | - Nitipol Srimongkolpithak
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, Thailand
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11
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Kornsakulkarn J, Palasarn S, Choowong W, Thongpanchang T, Boonyuen N, Choeyklin R, Boonpratuang T, Isaka M, Thongpanchang C. Antimalarial 9-Methoxystrobilurins, Oudemansins, and Related Polyketides from Cultures of Basidiomycete Favolaschia Species. J Nat Prod 2020; 83:905-917. [PMID: 32193929 DOI: 10.1021/acs.jnatprod.9b00647] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Fourteen new compounds, oudemansins 1-4, oudemansinols 5-7, favolasins 8-10, favolasinin (12), polyketides 13-15, and (R,E)-2,4-dimethyl-5-phenyl-4-pentene-2,3-diol (16), together with nine known compounds were isolated from the basidiomycete fungus Favolaschia sp. BCC 18686. Two new compounds, favolasin E (11) and 9-oxostrobilurin E (17), were isolated from the closely related organism Favolaschia calocera BCC 36684 along with nine β-methoxyacrylate-type derivatives. Compounds in the class of oudemansins and strobilurins exhibited moderate to strong antimalarial activity with relatively low cytotoxicity against Vero cells (African green monkey kidney fibroblasts). Potent antimalarial activity was demonstrated for 9-methoxystrobilurins G, K, and E (IC50 values 0.061, 0.089, and 0.14 μM, respectively). The structure-activity relationships (SAR) for antimalarial activity is proposed on the basis of the activity of the new and several known β-methoxyacrylate derivatives in combination with the data from previously isolated compounds. Furthermore, several compounds showed specific cytotoxicity against NCI-187 cells (human small-cell lung cancer), although the SAR was different from that for antimalarial activity.
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Affiliation(s)
- Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Somporn Palasarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Wilunda Choowong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Tienthong Thongpanchang
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Nattawut Boonyuen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
- National Biobank of Thailand (NBT), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Rattaket Choeyklin
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
- National Biobank of Thailand (NBT), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Thitiya Boonpratuang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
- National Biobank of Thailand (NBT), National Science and Technology Development Agency (NSTDA), Thailand Science Park, Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Masahiko Isaka
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
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Saepua S, Kornsakulkarn J, Auncharoen P, Rachtawee P, Kongthong S, Boonyuen N, Harding DJ, Nehira T, Thongpanchang T, Thongpanchang C. Secondary metabolites from cultures of the ant pathogenic fungus Ophiocordyceps irangiensis BCC 2728. Nat Prod Res 2020; 35:3556-3561. [PMID: 31933382 DOI: 10.1080/14786419.2020.1713119] [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] [Indexed: 10/25/2022]
Abstract
Five new compounds, iranginins A-E (1-5), together with sixteen known compounds were isolated from the insect pathogenic fungus Ophiocordyceps irangiensis BCC 2728. The structures and the absolute configurations of the new compounds were established by spectroscopic analyses, the application of modified Mosher's method (for 2), ECD calculation (for 5), and X-ray crystallographic analysis (for 4). LL-Z1640-5 and mucorisocoumarin C were active against Mycobacterium tuberculosis (MIC 41.7 and 85.0 µM, respectively), while peyroisocoumarin D exhibited cytotoxic activity (IC50 65.6 µM).
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Affiliation(s)
- Siriporn Saepua
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - Patchanee Auncharoen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - Pranee Rachtawee
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - Surisa Kongthong
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - Nattawut Boonyuen
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
| | - David J Harding
- Functional Materials and Nanotechnology Center of Excellence, Walailak University, Nakhon Si Thammarat, Thailand
| | - Tatsuo Nehira
- Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan
| | - Tienthong Thongpanchang
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Pathumthani, Thailand
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Saepua S, Sadorn K, Vanichtanankul J, Anukunwithaya T, Rattanajak R, Vitsupakorn D, Kamchonwongpaisan S, Yuthavong Y, Thongpanchang C. 6-Hydrophobic aromatic substituent pyrimethamine analogues as potential antimalarials for pyrimethamine-resistant Plasmodium falciparum. Bioorg Med Chem 2019; 27:115158. [DOI: 10.1016/j.bmc.2019.115158] [Citation(s) in RCA: 5] [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] [Received: 08/24/2019] [Revised: 10/07/2019] [Accepted: 10/08/2019] [Indexed: 10/25/2022]
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Saepua S, Kornsakulkarn J, Somyong W, Laksanacharoen P, Isaka M, Thongpanchang C. Bioactive compounds from the scale insect fungus Conoideocrella tenuis BCC 44534. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.01.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Dolsophon K, Soponpong J, Kornsakulkarn J, Thongpanchang C, Prabpai S, Kongsaeree P, Thongpanchang T. F-THENA: a chiral derivatizing agent for the determination of the absolute configuration of secondary aromatic alcohols with a self-validating system. Org Biomol Chem 2018; 14:11002-11012. [PMID: 27827507 DOI: 10.1039/c6ob02255c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
F-THENA is designed as an alternative fluorine-containing chiral derivatizing agent (CDA). The fluorine atom functions exclusively as a reporter which can directly sense an anisotropic effect from an aromatic substituent of a chiral alcohol. In combination with chemical shift differences from both 19F NMR and 1H NMR, the F-THENA method can successfully be used for determining the absolute configuration of chiral secondary aromatic alcohols with a self-validating system.
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Affiliation(s)
- Kulvadee Dolsophon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.
| | - Jakapun Soponpong
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.
| | - Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand Science Park, Phathumthani 12120, Thailand
| | - Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand Science Park, Phathumthani 12120, Thailand
| | - Samran Prabpai
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.
| | - Palangpon Kongsaeree
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand.
| | - Tienthong Thongpanchang
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Rama 6 Road, Bangkok 10400, Thailand. and National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand Science Park, Phathumthani 12120, Thailand
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Kornsakulkarn J, Saepua S, Suvannakad R, Supothina S, Boonyuen N, Isaka M, Prabpai S, Kongsaeree P, Thongpanchang C. Cytotoxic tropolones from the fungus Nemania sp. BCC 30850. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.05.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kornsakulkarn J, Saepua S, Laksanacharoen P, Rachtawee P, Thongpanchang C. Chaetone G, a new dibenzo[b,e]oxepinone from the insect pathogenic fungus Aschersonia luteola BCC 31749. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2015.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kornsakulkarn J, Somyong W, Supothina S, Boonyuen N, Thongpanchang C. Bioactive oxygen-bridged cyclooctadienes from endophytic fungus Phomopsis sp. BCC 45011. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Saepua S, Kornsakulkarn J, Choowong W, Supothina S, Thongpanchang C. Bioxanthracenes and monomeric analogues from insect pathogenic fungus Conoideocrella luteorostrata Zimm. BCC 31648. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.02.082] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kornsakulkarn J, Saepua S, Komwijit S, Rachtawee P, Thongpanchang C. Bioactive polyketides from the fungus Astrocystis sp. BCC 22166. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.004] [Citation(s) in RCA: 10] [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: 11/26/2022]
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Kornsakulkarn J, Saepua S, Srichomthong K, Supothina S, Thongpanchang C. New mycotoxins from the scale insect fungus Aschersonia coffeae Henn. BCC 28712. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.059] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Sopitthummakhun K, Thongpanchang C, Vilaivan T, Yuthavong Y, Chaiyen P, Leartsakulpanich U. Plasmodium serine hydroxymethyltransferase as a potential anti-malarial target: inhibition studies using improved methods for enzyme production and assay. Malar J 2012; 11:194. [PMID: 22691309 PMCID: PMC3502260 DOI: 10.1186/1475-2875-11-194] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2012] [Accepted: 05/30/2012] [Indexed: 11/21/2022] Open
Abstract
Background There is an urgent need for the discovery of new anti-malarial drugs. Thus, it is essential to explore different potential new targets that are unique to the parasite or that are required for its viability in order to develop new interventions for treating the disease. Plasmodium serine hydroxymethyltransferase (SHMT), an enzyme in the dTMP synthesis cycle, is a potential target for such new drugs, but convenient methods for producing and assaying the enzyme are still lacking, hampering the ability to screen inhibitors. Methods Production of recombinant Plasmodium falciparum SHMT (PfSHMT) and Plasmodium vivax SHMT (PvSHMT), using auto-induction media, were compared to those using the conventional Luria Bertani medium with isopropyl thio-β-D-galactoside (LB-IPTG) induction media. Plasmodium SHMT activity, kinetic parameters, and response to inhibitors were measured spectrophotometrically by coupling the reaction to that of 5,10-methylenetetrahydrofolate dehydrogenase (MTHFD). The identity of the intermediate formed upon inactivation of Plasmodium SHMTs by thiosemicarbazide was investigated by spectrophotometry, high performance liquid chromatography (HPLC), and liquid chromatography-mass spectrometry (LC-MS). The active site environment of Plasmodium SHMT was probed based on changes in the fluorescence emission spectrum upon addition of amino acids and folate. Results Auto-induction media resulted in a two to three-fold higher yield of Pf- and PvSHMT (7.38 and 29.29 mg/L) compared to that produced in cells induced in LB-IPTG media. A convenient spectrophotometric activity assay coupling Plasmodium SHMT and MTHFD gave similar kinetic parameters to those previously obtained from the anaerobic assay coupling SHMT and 5,10-methylenetetrahydrofolate reductase (MTHFR); thus demonstrating the validity of the new assay procedure. The improved method was adopted to screen for Plasmodium SHMT inhibitors, of which some were originally designed as inhibitors of malarial dihydrofolate reductase. Plasmodium SHMT was slowly inactivated by thiosemicarbazide and formed a covalent intermediate, PLP-thiosemicarbazone. Conclusions Auto-induction media offers a cost-effective method for the production of Plasmodium SHMTs and should be applicable for other Plasmodium enzymes. The SHMT-MTHFD coupled assay is equivalent to the SHMT-MTHFR coupled assay, but is more convenient for inhibitor screening and other studies of the enzyme. In addition to inhibitors of malarial SHMT, the development of species-specific, anti-SHMT inhibitors is plausible due to the presence of differential active sites on the Plasmodium enzymes.
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Affiliation(s)
- Kittipat Sopitthummakhun
- Department of Biochemistry and Center of Excellence in Protein Structure & Function, Faculty of Science, Mahidol University, Rama 6 Road Bangkok 10400, Thailand
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Kornsakulkarn J, Dolsophon K, Boonyuen N, Boonruangprapa T, Rachtawee P, Prabpai S, Kongsaeree P, Thongpanchang C. Dihydronaphthalenones from endophytic fungus Fusarium sp. BCC14842. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.07.078] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kornsakulkarn J, Thongpanchang C, Chainoy R, Choowong W, Nithithanasilp S, Thongpanchang T. Bioactive metabolites from cultures of basidiomycete Favolaschia tonkinensis. J Nat Prod 2010; 73:759-762. [PMID: 20329738 DOI: 10.1021/np900777r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Two strobilurins, 9-methoxystrobilurin B (1) and 9-methoxystrobilurin G (2), two monochlorinated 2,3-dihydro-1-benzoxepin derivatives, 3 and 4a, and butenolide 5, together with four known compounds, strobilurin B, 9-methoxystrobilurin A, and oudemansins A and B, were isolated from culture BCC 18689 of the fungus Favolaschia tonkinensis. 9-Methoxystrobilurins A, B (1), and G (2) and oudemansins A and B exhibited antimalarial, antifungal, and cytotoxic activities, while compounds 3, 4a, and 5 displayed only cytotoxic activity.
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Affiliation(s)
- Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology (BIOTEC), Thailand Science Park, 113 Phaholyothin Road, Klong Luang, Pathumthani 12120, Thailand
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Kornsakulkarn J, Thongpanchang C, Lapanun S, Srichomthong K. Isocoumarin glucosides from the scale insect fungus Torrubiella tenuis BCC 12732. J Nat Prod 2009; 72:1341-1343. [PMID: 19456117 DOI: 10.1021/np900082h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Three new isocoumarin glucosides (1, 3, and 4), 6,8-dihydroxy-3-methylisocoumarin (2), and 6,8-dihydroxy-3-hydroxymethylisocoumarin (5) were isolated from the scale insect pathogenic fungus Torrubiella tenuis BCC 12732. Structures of these compounds were elucidated using NMR spectroscopic and MS spectrometric analyses. Compound 5 exhibited moderate anti-HSV-1 and antimycobacterial activities with IC(50) and MIC values of 50 and 25 microg/mL, respectively.
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Affiliation(s)
- Jittra Kornsakulkarn
- National Center for Genetic Engineering and Biotechnology, Klong Luang, Pathumthani 12120, Thailand
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Gale GA, Kirtikara K, Pittayakhajonwut P, Sivichai S, Thebtaranonth Y, Thongpanchang C, Vichai V. In search of cyclooxygenase inhibitors, anti-Mycobacterium tuberculosis and anti-malarial drugs from Thai flora and microbes. Pharmacol Ther 2007; 115:307-51. [PMID: 17692387 DOI: 10.1016/j.pharmthera.2007.03.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2006] [Accepted: 03/12/2007] [Indexed: 02/02/2023]
Abstract
Malaria continues to be a major infectious disease of the developing world and the problem is compounded not only by the emergence of drug resistant strains but also from a lack of a vaccine. The situation for tuberculosis (TB) infection is equally problematic. Once considered a "treatable" disease for which eradication was predicted, TB has re-emerged as highly lethal, multi-drug resistant strains after the outbreak of AIDS. Worldwide, the disease causes millions of deaths annually. Similarly, treatments for chronic inflammatory diseases such as arthritis have been impeded due to the potentially lethal side effects of the new and widely prescribed non-steroidal anti-inflammatory compounds. Thais have utilized bioresources from plants and some microorganisms for medicine for thousands of years. Because of the need for new drugs to fight malaria and TB, with radically different chemical structures and mode of actions other than existing drugs, efforts have been directed towards searching for new drugs from bioresources. This is also true for anti-inflammatories. Although Thailand is considered species-rich, only a small number of potential bioresources has been investigated. This article briefly describes the pathogenesis of 2 infectious diseases, malaria and TB, and modern medicines employed in chemotherapy. Diversities of Thai flora and fungi and their chemical constituents with antagonistic properties against these 2 diseases are described in detail. Similarly, anti-inflammatory compounds, mostly cyclooxygenase (COX) inhibitors, are also described herein to demonstrate the potential of Thai bioresources to provide a wide array of compounds for treatment of diseases of a different nature.
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Affiliation(s)
- George A Gale
- King Mongkut's University of Technology Thonburi, School of Bioresources and Technology, Conservation Ecology Program, 83 Moo 8, Thakham, Bangkhuntien, Bangkok, Thailand
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Thongpanchang C, Taweechai S, Kamchonwongpaisan S, Yuthavong Y, Thebtaranonth Y. Immobilization of Malarial (Plasmodium falciparum) Dihydrofolate Reductase for the Selection of Tight-Binding Inhibitors from Combinatorial Library. Anal Chem 2007; 79:5006-12. [PMID: 17530740 DOI: 10.1021/ac070215s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple procedure for selection of tight-binding inhibitors of mutant dihydrofolate reductases from Plasmodium falciparum (PfDHFRs) based on preferential binding to the enzyme immobilized on a Sepharose column has been described. PfDHFRs with a cysteine residue at the C-terminal have been prepared in order to immobilize to a thiopropyl-Sepharose gel via S-S linkage. The amount of immobilized DHFRs was estimated to be 4-5 mg/g of dried gel, and the activities of bound DHFRs were comparable to that of free enzymes. The prepared immobilized enzyme has been used for the selection of tight-binding inhibitors from combinatorial libraries, based on the affinities of each ligand with the enzyme. Free ligands were then identified and analyzed quantitatively by high-performance liquid chromatography-mass spectrometry, and the components with high binding affinity of the library could thus be realized. Results could be confirmed by quantitative analysis of the bound ligands released from the enzyme by guanidine hydrochloride treatment.
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Affiliation(s)
- Chawanee Thongpanchang
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Klong 1, Klongluang, Pathumtani 12120, Thailand.
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