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Three new lipopeptides (1-3) were isolated from the organic extract of Bacillus amyloliquefaciens strain (BO7). These compounds represented the major constituents (>60%) of the total cell lipids extractable with CHCl(3)/MeOH (2:1). Elucidation of their chemical structure was carried out by spectroscopic analyses, including 1D and 2D NMR spectroscopy, mass spectrometry (MS), and secondary ion mass spectrometry (MS/MS), along with chemical degradation. The compounds are members of the surfactins family and are based on the heptapeptide Glu-Leu-Leu-Ala-Asp-Leu-Leu, N-acylated to the N-terminal by an (R)-3-hydroxy fatty acid with linear alkyl chains from 16:0 to 18:0 (1-3, respectively). An ester bond between the 3-hydroxyl group of the fatty acid and the carboxylic group of the C-terminal amino acid closes a 13-membered lactone ring. The bacterial lipopeptides, particularly compound 3, displayed strong and dose-dependent antifungal activity against the plant pathogenic fungus Fusarium oxysporum.
Dipartimento di Arboricoltura, Botanica e Patologia Vegetale, Università di Napoli Federico II, Portici (NA), Italy.
This article was published in the following journal.
Name: Journal of natural products
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One of the Type II site-specific deoxyribonucleases (EC 184.108.40.206). It recognizes and cleaves the sequence G/GATCC at the slash. BamHI is from Bacillus amyloliquefaciens N. Numerous isoschizomers have been identified. EC 3.1.21.-.
A cyclic polypeptide antibiotic isolated from culture filtrates of Bacillus subtilis that acts as an antifungal agent.
Viruses whose host is Bacillus. Frequently encountered Bacillus phages include bacteriophage phi 29 and bacteriophage phi 105.
A complex of cyclic peptide antibiotics produced by the Tracy-I strain of Bacillus subtilis. The commercial preparation is a mixture of at least nine bacitracins with bacitracin A as the major constituent. It is used topically to treat open infections such as infected eczema and infected dermal ulcers. (From Goodman and Gilman, The Pharmacological Basis of Therapeutics, 8th ed, p1140)
A seven-membered aromatic ring compound. It is structurally related to a number of naturally occurring antifungal compounds (ANTIFUNGAL AGENTS).