The myxalamids, new antibiotics from Myxococcus xanthus (Myxobacterales) I. production, physico-chemical and biological properties, and mechanism of action.

Abstract
From the cell mass and culture supernatant of M. xanthus strain Mx X12 an antibiotic activity against yeasts, molds and some gram-positive bacteria was extracted. It consisted of 4 biologically active compounds which were named myxalamid A, B, C and D. The main component, myxalamid B, blocked the respiratory chain at the site of complex I, i.e., NADH: ubiquinone oxidoreductase, in beef heart submitochondrial particles.