Abstract
Although Gram-negative bacterial pathogens continue to impart a substantial burden on global healthcare systems, much remains to be understood about aspects of basic physiology in these organisms. In recent years, cyclic-diguanylate (c-di-GMP) has emerged as a key regulator of a number of important processes related to pathogenicity, including biofilm formation, motility and virulence. In an effort to discover chemical genetic probes for studying V. cholerae we have developed a new motility-based high-throughput screen to identify compounds that modulate c-di-GMP levels. Using this new screening platform, we tested a library of microbially-derived marine natural products extracts, leading to the discovery of the bioactive lipid (S)-sebastenoic acid. Evaluation of the effect of this new compound on bacterial motility, vpsL expression and biofilm formation implied that (S)-sebastenoic acid may alter phenotypes associated to c-di-GMP signaling in V. cholerae.
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