CST, 31403S, Ascomycin (FK520)

Product Usage Information
Ascomycin (FK520) is supplied as a lyophilized powder. For a 5 mM stock, reconstitute 5 mg of powder in 1.26 ml of DMSO. Working concentrations and length of treatment can vary depending on the desired effect.
Storage
Store lyophilized at -20ºC, desiccated. In lyophilized form, the chemical is stable for 24 months. Once in solution, store at -20ºC and use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles.
Background
Ascomycin (FK520) is a 23-membered macrolide lactone produced from the fermentation of (1). A natural analogue of FK506, Ascomycin (FK520) has the ability to bind to FK506-binding protein 12 (FKBP12), inhibiting calcineurin phosphatase activity, and disrupting the activation of nuclear factor of activated T cells (NFAT) and other various substrates (2). Primarily described as an antifungal antibiotic, Ascomycin (FK520) has shown to be a potent immunosuppressant (IC = 0.55 nM) used to prevent the rejection of organ transplants and skin allografts (1,3). Ascomycin (FK520) displays powerful antimalarial properties independent of its immunosuppressive mechanisms of action (2).
Alternate Names
Fermentation product from Streptomyces hygroscopicus; Streptomyces hygroscopicus