A new alkaloid AM-2282 OF Streptomyces origin. Taxonomy, fermentation, isolation and preliminary characterization

AM-2282, a new alkaloid has been isolated from cultures of Streptomyces sp. AM-2282 by solvent extraction and silica gel chromatography. The compound exhibits a strong absorption maximum at 292 nm and shows antimicrobial activity against fungi and yeast. The LD50 of its hydrochloride (i.p. in mice) is 6.6 mg/kg. The molecular formula of AM-2282 has been determined as C28H26N4O3. The producing strain, AM-2282 was classified as a new species and the name, Streptomyces staurosporeus AWAYA, TAKAHASHI and OMURA, nov. sp. is proposed.

Production of quinoline-2-methanol and quinoline-2-methanol acetate by a new species of Kitasatoa Kitasato griseophaeus

Two metabolites have been isolated from the fermentation broth of a new species of Kitasatoa, Kitasatoa griseophaeus. These alkaloids have been identified as quinoline-2-methanol and quinoline-2-methanol acetate. The former exhibits hypoglycemic activity in the rat.

In vitro and in vivo activity of penicillinase inhibitor KA-107 against Staphylococcus aureus FS-1277

The activities of penicillinase inhibitor, KA-107 extracted from culture filtrates of Streptomyces gedanensis ATCC 4880, were studied by using penicillin-resistant S. aureus FS-1277 and by means of in vitro and in vivo tests.

Screening and isolation of penicillinase inhibitor, KA-107

It is known that penicillin resistance of bacteria is mainly caused by the inactivation of penicillin by penicillinase derived from such strains. We have developed a screening procedure for penicillinase inhibitors. Several microorganisms were found to produce such inhibitors, and from the culture filtrate of Streptomyces gedanensis ATCC 4880 a penicillinase inhibitor, named KA-107, was isolated. The characteristics of this inhibitor were revealed by an in vitro test by using penicillinase derived from penicillin resistant Staphylococcus aureus, FS-1277. When KA-107 was used in combination with penicillin-G, ampicillin, d- or l-phenethicillin, the growth inhibitory activity of these penicillins was maintained.