Abstract
CALCINEURIN is the only protein phosphatase known to be under the control of Ca2+ and calmodulin1,2. It is targeted by immuno-suppressive drugs and has a critical role in T-cell activation3,4. It is specifically inhibited by immunosuppressant immunophilin complexes, which enabled its function in regulating a wide range of cellular responses to Ca2+-mobilizing signals5,6 to be identified. Calcineurin in situ is 10–20 times more active than in the purified form and is subject to a time- and Ca2+/calmodulin-dependent reversible inactivation that is facilitated by small, heat-stable molecules7. Here we identify a factor that prevents the inactivation of calcineurin in vitro and in vivo as the enzyme superoxide dismutase, which indicates that inactivation may be the result of oxidative damage to the Fe–Zn active centre of calcineurin. The redox state of iron provides a mechanism to regulate calcineurin activity by desensitizing the enzyme and coupling Ca2+-dependent protein dephosphorylation to the redox state of the cell. The protection of calcineurin against inactivation by superoxide dismutase constitutes a new physiological role for this enzyme which enables the Ca2+-dependent regulation of cellular processes to be modulated by the redox potential.
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Wang, X., Culotta, V. & Klee, C. Superoxide dismutase protects calcineurin from inactivation. Nature 383, 434–437 (1996). https://doi.org/10.1038/383434a0
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DOI: https://doi.org/10.1038/383434a0
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