Sankyo Company, Limited

Mamoru Arai

Mutsuo Nakajima

Tatsuo Haneishi

Akio Torikata

Ryuzou Enokita

Takao Okazaki

Noritoshi Kitano

Masatoshi Inukai

Yo Takiguchi

Ryuzo Enokita

Toshiaki Matsuzawa

Toshinori Ohmine

Masaki Nakahara

Hisayoshi Fukatsu

Yasuhiro Itoh

Taichi Manome

A novel plasmid, named pSAN 181, has a molecular weight of 5.+-.0.2 megadaltons and single cleavage sites for each of the restriction endonucleases BamHI, PstI, XhoI and BglII, the positions of said sites being 0, about 0.85, about 1.15 and about 3.95 megadaltons from the cleavage site of BamHI. The plasmid is extracted from mycelia of microorganisms of the species Streptomyces fulvoviridis, especially the strain Streptomyces fulvoviridis FERM P-6279, and is useful as a vector for genetic engineering.

Plasmid pSAN 181

Macrolide antibiotics are derivatives of the compound Mycoplanecin and have the formula: ##STR1## (in which R represents a hydrogen atom or an N-(.alpha.-hydroxybutyryl)-N-methylvalyl group). The compound in which R represents an N-(.alpha.-hydroxybutyryl)-N-methylvalyl group can be prepared by reducing Mycoplanecin and the compound in which R represents a hydrogen atom can be prepared by the hydrolysis of Mycoplanecin or of the compound of formula (I) in which R represents an N-(.alpha.-hydroxybutyryl)-N-methylvalyl group.

Macrolide antibiotic

Mycoplanecin derivatives of formula (I): ##STR1## [wherein: R represents a hydrogen atom, an N-(.alpha.-ketobutyryl)-N-methylvalyl group or an N-(.alpha.-hydroxybutyryl)-N-methylvalyl group;

Mycoplanecin derivatives and their preparation

A novel antibiotic substance, named 'Mycoplanecin', of presently unknown structural formula, is produced by cultivating a Mycoplanecin-producing microorganism of the genus Actinoplanes, especially the Actinoplanes nov. sp. Strain No. 41042, NRRL No. 11462.

Antibiotic substance

New antibiotic substances named substance No. 17927A.sub.2 and substance No. 17927A.sub.1 produced by cultivation of substances No. 17927A.sub.2 and No. 17927A.sub.1 -producing microorganisms belonging to the genus Streptomyces as well as pharmaceutically-acceptable salts thereof. They have broad antibacterial activities and also .beta.-lactamase inhibitory action so that they show synergistic actions with known penicillins and cephalosporins.

Antibiotic substances No. 17927A.sub.1 and No. 17927A.sub.2 and process

Antibiotic substance named 'Pholipomycin' which is useful as a growth promoting agent for domestic animals, poultries and the like and produced by the cultivation of a new microorganism, Streptomyces lividoclavatus strain No. 3176, NRRL 8022.

Growing community of inventors

Hiromachi, Japan

Mamoru Arai