摘要:
The presently disclosed subject matter demonstrates that ThnG and ThnQ enzymes encoded by the thienamycin gene cluster in Streptomyces cattleya oxidize the C-2 and C-6 moieties of carbapenems, respectively. ThnQ stereospecifically hydroxylates PS-5 giving N-acetyl thienamycin. ThnG catalyzes sequential desaturation and sulfoxidation of PS-5, giving PS-7 and its sulfoxide. The ThnG and ThnQ enzymes are relatively substrate selective, but give rise to the oxidative diversity of carbapenems produced by S. cattleya, and orthologues likely function similarly in allied streptomyces.
摘要:
The present invention relates to a process for the preparation of 3′-thiosubstituted cephalosporins by enzymatic condensation of a nucleus with a phenylglycine derivative. Furthermore the present invention relates to a crystalline form of a compound of general formula (1) wherein R2 is OH and X is S and R1 is a radical of formula (2a) with R3 is CH3.
摘要:
Antibiotics PA-41746-A.sub.2, PA-41746-E and PA-41746-F produced by fermentation of Streptomyces pluracidomyceticus on a conventional culture medium, having .beta.-lactamase inhibitory activities and excellent antimicrobial activities, and useful as drugs for treatment of infections in humans or animals, or as disinfectants.
摘要:
Novel carbapenem compounds, which are shown by the formula (I): ##STR1## wherein R is --SO.sub.3 H or hydrogen, or a physiologically acceptable salt thereof, are useful as a bactericide or disinfectant, and also produce a synergistic effect with penicillin and/or cephalosporin antibiotic agents.The compound of the formula (I) can be produced by subjecting to reduction reaction a compound of the formula: ##STR2## wherein R has the same meaning as defined above, or a salt thereof.
摘要:
A new antibiotic having .beta.-lactamase inhibitory activity, PA-39504-X.sub.1 of the formula: ##STR1## being useful as a medicament and a veterinary drug for inhibiting the growth of gram-positive and gram-negative pathogenic microorganisms and a process for preparing the same, being characterized by cultivating Streptomyces argenteolus PA-39504 or Streptomyces tokunonensis PA-31088 in a suitable medium and recovering PA-39504-X.sub.1 from the cultured broth.
摘要:
The antibiotic MSD 890A.sub.10 and pharmaceutically acceptable salts thereof (hereinafter referred to as antibiotic 890A.sub.10) is active against both gram-positive and gram-negative bacteria. The antibiotic is produced by growing species of Streptomyces on suitable fermentation media.
摘要:
This invention relates to the new antibiotic, desacetyl 890A.sub.10, active against both gram-positive and gram-negative bacteria, which is produced by treating 890A.sub.10 with an N-acetyl-890A.sub.10 amidohydrolase produced by a soil microorganism isolated by enrichment techniques. This invention also relates to the process by which 890A.sub.10 is enzymatically deacetylated.
摘要:
A novel antibiotic designated herein MM 17880 may be obtained from the cultivation of strains of Streptomyces olivaceus and related organisms. In addition to being potent antibacterial agents, MM 17880 and its salts inhibit .beta.-lactamase obtained from many organisms so that it shows a synergistic antibacterical effect when combined with .beta.-lactam antibiotics.