Abstract
A group of new 10mer linear peptides, designated culicinins A-D (1-4), was isolated from the fermentation broth of the entomopathogenic fungus Culicinomyces clavisporus, strain LL-12I252. The structures of the culicinins were determined by a combination of 2D NMR and MS analysis. The major compound, culicinin D (4), exhibited selective inhibitory activity against PTEN-negative MDA468 tumor cells. Studies on the 3D structure of 4 using NOE data and computer modeling revealed a dominant conformation of the right-handed helix.
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