A. Shafiee et al., CHEMICAL AND BIOLOGICAL CHARACTERIZATION OF 2 FK506 ANALOGS PRODUCED BY TARGETED GENE DISRUPTION IN STREPTOMYCES SP MA6548, Journal of antibiotics, 50(5), 1997, pp. 418-423
Two genetically engineered mutant strains of Streptomyces sp. MA6548 p
roduced two FK506 analogs, 9-deoxo-31-O-demethylFK506 and 31-O-demethy
lFK506. The structures were determined by a combination of NMR and mas
s spectrometry. These compounds exhibited immunosuppressive and antifu
ngal activities, albeit reduced, compared to FK506. Both compounds con
tain a free hydroxyl group at C-31 for the synthesis of novel FK506 de
rivatives.