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Author: search.filters.author.Choowong, WilundaSubject: search.filters.subject.Antimalarial

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    Antimalarial and antimicrobial substances isolated from the endophytic actinomycete, Streptomyces aculeolatus MS1-6
    (2023-03-01)
    Kuncharoen, Nattakorn
    ;
    Bunbamrung, Nantiya
    ;
    Intaraudom, Chakapong
    ;
    Choowong, Wilunda
    ;
    Thawai, Chitti
    Seven undescribed compounds, including four naphthoquinone terpenoids (aculeolatins A – D), one rare 2-nitropyrrole terpenoid (nitropyrrolin F), and two hydroxamate siderophores (aculeolamides A and B) and one further undescribed compound (2,5,7-trihydroxy-3,6-dimethylnaphthalene-1,4-dione), together with eleven known compounds (arromycin, phenaziterpene A, nitropyrrolin A, heronapyrroles A and B, salaceyin A, 5,7-dihydroxy-2-isopropylchromone, 1-hydroxyphenazine, 1-methoxyphenazine, 1-acetyl-β-carboline, and N-(2-phenylethyl) acetamide), were isolated from the cultures of the endophytic Streptomyces aculeolatus MS1-6. The structures of the isolated compounds were determined using NMR spectroscopy and corroborated using chemical modification. These compounds exhibited a broad spectrum of biological activities, including antimalarial (IC<inf>50</inf> 6.03–9.84 μg/mL), antitubercular (MIC 3.13–6.25 μg/mL), anti-plant pathogenic fungal (MIC 25.0–50.0 μg/mL), and antibacterial (MIC 3.03–50 μg/mL) activities; however, they displayed unremarkable cytotoxicity against cancerous (MCF-7 and NCI–H187) and non-cancerous (Vero) cell lines.
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    Antimalarial and antitubercular C-glycosylated benz[α]anthraquinones from the marine-derived Streptomyces sp. BCC45596
    (2012-09-01)
    Supong, Khomsan
    ;
    Thawai, Chitti
    ;
    Suwanborirux, Khanit
    ;
    Choowong, Wilunda
    ;
    Supothina, Sumalee
    Three naturally new C-glycosylated benz[α]anthraquinone derivatives, urdamycinone E (1), urdamycinone G (2), dehydroxyaquayamycin (3) have been isolated from the marine Streptomycetes sp. BCC45596. Urdamycin E (4), the possible biosynthetic precursor of 1-3, has also been identified after a re-cultivation of the strain. These compounds (1-4) exhibited potent anti-Plasmodium palcifarum K1 strain with IC <inf>50</inf> values in a range of 0.0534-2.93 μg/mL and anti-Mycobacterium tuberculosis with minimum inhibition concentrations (MICs) in a range of 3.13-12.50 μg/mL. Cytotoxicity against KB, MCF-7, NCI-H187, and Vero cells was also evaluated. © 2012 Phytochemical Society of Europe.