Bequinostatins A and B new inhibitors of glutathione S-transferase, produced by Streptomyces sp. MI384-DF12. Production, isolation, structure determination and biological activities

  • J Antibiot (Tokyo). 1993 Jun;46(6):914-20. doi: 10.7164/antibiotics.46.914.
T Aoyama  1 ,  F Kojima ,  F Abe ,  Y Muraoka ,  H Naganawa ,  T Takeuchi ,  T Aoyagi
Affiliations
  • 1. Institute of Microbial Chemistry, Tokyo, Japan.
PMID: 8344872 DOI: 10.7164/antibiotics.46.914
Abstract

New benzo[a]naphthacenequinone metabolites, designated bequinostatins A and B, have been isolated from the culture broth of the benastatin-producing strain Streptomyces sp. MI384-DF12. The structures of bequinostatins A and B were determined by spectral analyses to be 5,6,8,13-tetrahydro-1,6,7,9,11-pentahydroxy-8,13-dioxo-3- pentylbenzo[a]naphthacene-2-carboxylic acid and 2-decarboxybequinostatin A, respectively. Bequinostatin A showed considerable inhibitory activity against human pi class Glutathione S-transferase (GST pi).

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