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Heliquinomycin is a bacterial metabolite originally isolated from Streptomyces that has diverse biological activities.1 It is active against a variety of Gram-positive bacteria, including strains of B. anthracis, B. subtilis, and methicillin-sensitive or -resistant S. aureus (MICs = <0.05-0.39 µg/ml). Heliquinomycin inhibits the activity of DNA helicase with a Ki value of 6.8 µM. It reduces the growth of L1210 leukemia, B16 melanoma, and FS-3 fibrosarcoma cells (IC50s = 0.97, 0.89, and 0.83 µg/ml, respectively).

1.Chino, M., Nishikawa, K., Umekita, M., et al.Heliquinomycin, a new inhibitor of DNA helicase, produced by Streptomyces sp. MJ929-SF2 I. Taxonomy, production, isolation, physico-chemical properties and biological activitiesJ. Antibiot. (Tokyo)49(8)752-757(1996)

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