Signal Transduction Inhibitors, Hibarimicins A, B, C, D and G Produced by Microbispora. 1. Taxonomy, Fermentation, Isolation and Physico-chemical and Biological Properties

Kajiura, T.; Furumai, T.; Igarashi, Y.; Hori, H.; Higashi, K.; Ishiyama, T.; Uramoto, M.; Uehara, Y.; Oki, T.

The Journal of Antibiotics 51(4): 394-401

1998


DOI: 10.7164/antibiotics.51.394
Accession: 068516760

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Abstract
Strain TP-AO121 which produces a complex of novel tyrosine kinase inhibitors designated hibarimicins A, B, C, D and G was considered to be a new subspecies of Microbispora rosea, and the name, Microbispora rosea subsp. hibaria, was proposed. Hibarimicins A, B, C and D specifically inhibited the src tyrosine kinase activity without affecting protein kinase A or protein kinase C. They also showed in vitro anti-Gram-positive bacterial and antitumor activities. The molecular formulae of hibarimicins A, B, C, D and G were assigned to be C85H112O37, C85H112O37, C83H110O36, C85H112O38, and C85H112O39 respectively.