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HSQC-TOCSY Fingerprinting-Directed Discovery of Antiplasmodial Polyketides from the Marine Ascidian-Derived Streptomyces sp. (USC-16018).

ABSTRACT: Chemical investigations on the fermentation extract obtained from an ascidian-derived Streptomyces sp. (USC-16018) yielded a new ansamycin polyketide, herbimycin G (1), as well as a known macrocyclic polyketide, elaiophylin (2), and four known diketopiperazines (3?6). The structures of the compounds were elucidated based on 1D/2D NMR and MS data. The absolute configuration of 1 was established by comparison of experimental and predicted electronic circular dichroism (ECD) data. Antiplasmodial activities were tested for the natural products against chloroquine sensitive (3D7) and chloroquine resistant (Dd2) Plasmodium falciparum strains; the two polyketides (1?2) demonstrated an inhibition of >75% against both parasite strains and while 2 was highly cytotoxic, herbimycin G (1) showed no cytotoxicity and good predicted water solubility.

SUBMITTER: Buedenbender L 

PROVIDER: S-EPMC6025042 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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HSQC-TOCSY Fingerprinting-Directed Discovery of Antiplasmodial Polyketides from the Marine Ascidian-Derived <i>Streptomyces</i> sp. (USC-16018).

Buedenbender Larissa L   Robertson Luke P LP   Lucantoni Leonardo L   Avery Vicky M VM   Kurtböke D İpek Dİ   Carroll Anthony R AR  

Marine drugs 20180530 6

Chemical investigations on the fermentation extract obtained from an ascidian-derived <i>Streptomyces</i> sp. (USC-16018) yielded a new ansamycin polyketide, herbimycin G (<b>1</b>), as well as a known macrocyclic polyketide, elaiophylin (<b>2</b>), and four known diketopiperazines (<b>3</b>⁻<b>6</b>). The structures of the compounds were elucidated based on 1D/2D NMR and MS data. The absolute configuration of <b>1</b> was established by comparison of experimental and predicted electronic circul  ...[more]

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