The immunosuppressive drugs cyclosporin A (CsA) and FK506 bind to distinct families of intracellular proteins, cyclophilins, and FK506 binding proteins (FKBP) respectively, termed immunophilins. Immuno-suppressant-immunophilin complexes bind to and inhibit the activity of calcineurin, a calcium-dependent serine/threonine phosphatase. CsA is known to inhibit… (More)
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