title: Novel macrocyclic antibiotics: megovalicins A, B, C, D, G and H. I. Screening of antibiotics-producing myxobacteria and production of megovalicins.
abstract: New antibiotics belonging to macrocyclic were discovered and named megovalicins A, B, C, D, G and H. The antibiotics were accumulated endogeneously by a newly isolated myxobacterium identified as Myxococcus flavescens. Tank culture of the bacterium for 4 days gave 8.8 g cells/liter on a wet basis, and 4.8, 7.1, 20.0, 0.4, 3.75 and 15.0 micrograms of megovalicins A, B, C, D, G and H respectively were obtained from 1 g wet cells.
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000494:pharmacology; D005285:Fermentation; D007783:Lactones / Q000096:biosynthesis / Q000494:pharmacology; D009231:Myxococcales / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D007783:Lactones