RESUMEN
Kasumigamide is an antialgal hybrid peptide-polyketide isolated from the freshwater cyanobacterium Microcystis aeruginosa (NIES-87). The biosynthetic gene cluster was identified from not only the cyanobacterium but also Candidatus "Entotheonella", associated with the Japanese marine sponge Discodermia calyx. Therefore, kasumigamide is considered to play a key role in microbial ecology, regardless of the terrestrial and marine habitats. We now report synthetic studies on this intriguing natural product that have led to a structural revision and the first total synthesis. During this study, a new analogue, deoxykasumigamide, was also isolated and structurally validated. This study confirmed the presence of the unusual pathway in the biosynthesis of a hybrid peptide-polyketide natural product.
Asunto(s)
Productos Biológicos/análisis , Productos Biológicos/síntesis química , Oligopéptidos/análisis , Oligopéptidos/síntesis química , Productos Biológicos/metabolismo , Conformación Molecular , Oligopéptidos/biosíntesisRESUMEN
Theonellapeptolide Id is a tridecapeptide containing a 37-membered lactone, originally isolated from the marine sponge Theonella swinhoei. In addition to moderate cytotoxicity, immunosuppressive activity had been reported for this natural cyclodepsipeptide. However, the synthetic material to verify its unique biological activity has not been available thus far. In this study, the first total synthesis of theonellapeptolide Id has been performed by solid phase peptide synthesis, and the biological activity has been confirmed in comparison with cyclosporin A.
