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Calcineurin
Definition 1
Ubiquitous heterodimeric human Calcineurin is Ca(2+)/calmodulin-regulated protein phosphatase involved in many biologic activities as a modifier of phosphorylation status. Composed of widely expressed or tissue-restricted 55-60-kDa calmodulin-binding catalytic subunit (PPP Phosphatase/PP-2B Family) and conserved 19-kD Ca(2+)-sensitive regulatory subunit, Calcineurin appears to regulate glycolytic metabolism, nuclear translocation of NFATC1 transcription factor, sperm motility, and dopaminergic signal transduction and NMDA receptor-dependent synaptic plasticity. (NCI Thesaurus)
Definition 2
A calcium- and calmodulin-binding protein present in highest concentrations in the central nervous system. Calcineurin is composed of two subunits. A catalytic subunit, calcineurin A, and a regulatory subunit, calcineurin B, with molecular weights of about 60 kD and 19 kD, respectively. Calcineurin has been shown to dephosphorylate a number of phosphoproteins including histones, myosin light chain, and the regulatory subunit of cAMP-dependent protein kinase. It is involved in the regulation of signal transduction and is the target of an important class of immunophilin-immunosuppressive drug complexes in T-lymphocytes that act by inhibiting T-cell activation. EC 3.1.3.-. (NLM, Medical Subject Headings)
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