1983 Volume 36 Issue 1 Pages 6-12
Antibiotic activity was isolated from the culture supernatant of the myxobacterium Myxococcus fulvus strain Mx f65. It was active against Gram-positive bacteria (MIC 0.3-5 μg/ml), at higher concentrations also against Gram-negative ones (MIC 6-100 μg/ml), and not at all against yeasts and molds. The activity could be resolved into 4 closely related peptides, the myxovalargins. One of them, myxovalargin A, was by far the most plentiful. The compounds appear to be new antibiotics and seem to interfere with protein synthesis.