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Research article - Peer-reviewed, 2005

Pseudotrienic acids A and B, two bioactive metabolites from Pseudomonas sp MF381-IODS

Pohanka A, Broberg A, Johansson M, Kenne L, Levenfors J


Bioassay-guided fractionation of the liquid culture broth of Pseudomonas sp. MF381-IODS yielded two new antimicrobial substances, identified as (2E,4E,6E)-9-[((2S,3R)-3-hydroxy-4-{[(3E,5E,7RS)-7-hydroxy-4-methylhexadeca-3,5-dienoyl]amino}-2-methylbutanoyl)amino]nona-2,4,6-trienoic acid and the tetradeca equivalent, named pseudotrienic acids A (1) and B (2), respectively. The compounds are prone to lactone formation, and their structures suggest them to be derived from ring opening of a macrolide. Pseudotrienic acids A and B inhibited growth of Staphylococcus aureus (MIC 70 mu g/mL) and Pseudomonas syringae pv. syringae (MIC 70 mu g/mL). Two known antimicrobial compounds, the polyketide 2,3-deepoxy-2,3-didehydrorhizoxin (3) and the tryptophan-derived pyrrolnitrin (4), were also identified

Published in

Journal of Natural Products
2005, Volume: 68, number: 9, pages: 1380-1385