A Gram-negative bacterium was found to produce a new zinc-containing antibiotics, micacocidin A and related compounds containing Cu or Fe, micacocidin B and C, respectively. These antibiotics were isolated by column chromatography on silica gel, and then separated by preparative TLC and HPLC. These new antibiotics exhibited an excellent activity against Mycoplasma species. The producing bacterium was characterized and ascribed to the genus Pseudomonas.
