Calcineurin is a Ca2+/calmodulin-dependent protein phosphatase. The active enzyme is a heterodimer of a large calmodulin-binding catalytic
subunit A (61 kDa) and a smaller Ca2+ binding subunit B (19 kDa). Regions corresponding to the calmodulin-binding site, an autoinhibitory
domain, and a putative subunit B binding site have been identified within the large subunit A. The activity of calcineurin is sensitive to
immunosuppressants such as cyclosporin A (CsA) and tacrolimus (FK506). The study of FK506-mediated inhibition of nitric oxide formation
has revealed that nitric oxide synthase (NOS) is a calcineurin substrate. Calcineurin dephosphorylates NOS and enhances its catalytic activity.
Therefore, Calcineurin is an essential mediator for efficient T cell antigen receptor (TCR)-mediated T cell activation.
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注意事项:
1.Since applications vary, each investigator should titrate the reagent to obtain optimal results.
2.Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.