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  • Title: SNA-8073-B, a new isotetracenone antibiotic inhibits prolyl endopeptidase. I. Fermentation, isolation and biological properties.
    Author: Kimura K, Kanou F, Koshino H, Uramoto M, Yoshihama M.
    Journal: J Antibiot (Tokyo); 1997 Apr; 50(4):291-6. PubMed ID: 9186552.
    Abstract:
    SNA-8073-B, an inhibitor of prolyl endopeptidase isolated from the broth filtrate of Streptomyces sp. SNA-8073, is a new isotetracenone antibiotic. It was purified by ethyl acetate extraction, silica gel column chromatography and high performance liquid chromatography on ODS column. SNA-8073-B has the molecular formula of C20H16O5 and is a stereoisomer of SNA-8073-A (fujianmycin B, rubiginone A2). SNA-8073-B inhibited prolyl endopeptidase of Flavobacterium non-competitively (IC50 = 8.9 microM) when Z-Gly-Pro-pNA was used as a substrate, but SNA-8073-A did not show any inhibition even at 60 microM.
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