Gageostatins A-C, Antimicrobial Linear Lipopeptides from a Marine Bacillus Subtilis

Overview

Journal Mar Drugs

Publisher MDPI

Specialties Biology
Pharmacology

Date 2014 Feb 5

PMID 24492520

Citations 25

Authors

Fakir Shahidullah Tareq

Min Ah Lee

Hyi-Seung Lee

Jong-Seok Lee

Yeon-Ju Lee

Hee Jae Shin

Affiliations

Soon will be listed here.

Abstract

Concerning the requirements of effective drug candidates to combat against high rising multidrug resistant pathogens, we isolated three new linear lipopeptides, gageostatins A-C (1-3), consisting of hepta-peptides and new 3-β-hydroxy fatty acids from the fermentation broth of a marine-derived bacterium Bacillus subtilis. Their structures were elucidated by analyzing a combination of extensive 1D, 2D NMR spectroscopic data and high resolution ESIMS data. Fatty acids, namely 3-β-hydroxy-11-methyltridecanoic and 3-β-hydroxy-9,11-dimethyltridecanoic acids were characterized in lipopeptides 1 and 2, respectively, whereas an unsaturated fatty acid (E)-7,9-dimethylundec-2-enoic acid was assigned in 3. The 3R configuration of the stereocenter of 3-β-hydroxy fatty acids in 1 and 2 was established by Mosher's MTPA method. The absolute stereochemistry of amino acid residues in 1-3 was ascertained by acid hydrolysis followed by Marfey's derivatization studies. Gageostatins 1-3 exhibited good antifungal activities with MICs values of 4-32 µg/mL when tested against pathogenic fungi (R. solani, B. cinerea and C. acutatum) and moderate antibacterial activity against bacteria (B. subtilis, S. aeureus, S. typhi and P. aeruginosa) with MICs values of 8-64 µg/mL. Futhermore, gageostatins 1-3 displayed cytotoxicity against six human cancer cell lines with GI₅₀ values of 4.6-19.6 µg/mL. It is also noteworthy that mixed compounds 1+2 displayed better antifungal and cytotoxic activities than individuals.

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