Panowamycins A and B, new antitrypanosomal isochromans produced by Streptomyces sp. K07-0010

Abstract

Two new isochromans, panowamycins A and B, were purified by solvent extraction, silica gel and octadecylsilyl silica gel (ODS) column chromatography followed by preparative HPLC, from a culture broth of Streptomyces sp. K07-0010, together with the known compounds NFAT-133, conglobatin, piericidin C series and dinactin. Structures of panowamycins were elucidated as new analogs of NFAT-133 by spectroscopic studies including various NMR experiments. Panowamycins A and B showed moderate antitrypanosomal activity, with IC 50 values of 0.40 and 3.30 μg ml-1, respectively. © 2012 Japan Antibiotics Research Association All rights reserved.