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Localisation and expression:
Calcineurin is a cytoplasmic protein. The catalytic subunit calcineurin A, posses two major isoforms called calcineurin Aα and Aβ. the first is widely expressed among tissues whereas the other is mainly found in the lymphoid cells.Calcineurin Aβ is therefore involved in the mediation of the immune response [3].
Function
General structure
is a heterodimeric Protein that consits of two subunits. They are called catalytic and regulatory subunit.
This structure presented in this article is the catalytic subunit isoform of the serine/threonine-protein phosphatase 2B in rattus norvegicus (rat). It consists of 521 [4] aminoacids and has a molecular weight of 57 kDa [5].
The calatytic subunit is subdivided into functional domains which are a catalytic domain, a binding domain for the regulary subsunit, a calmodulin binding domain and an autoinhibitory domain.
ChainA
Discovery of the structure:
The structure have been published in the year 2013 by Qilu Ye et al. [6]. For their experiments they used x-ray diffraction. The PDB validation obtained a Resolutionof 3.0 Å, a free R-value of 0.273 and a work R-value of 0.241 [7].
secondary structure:
The secondary structure includes mostly helical structures: 
Mechanism of action
Addictional structural highlights
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Binding Partners
The main partners of interaction are Calmodulin,
Calcineurin is inhibited by the immunosuppressive drugs tacrolismus (FK506) or cyclosporine A (CsA). CsA and FK506 conduct their therapeutic role thought binding to the immunophilins cyclophilin and FK506 binding protein (FK506BP) respectively. The complexes CsA-cyclophilin and FK506-FK506BP bind then to calcineurin in a calcium-dependent manner thus inhibiting its phosphatase activity. Therefore the addition of these drugs to lymphocytes T prevent NFAT translocation to the nucleus and the subsequent activation its target gene.That's why FK506 and CsA are use in the treatment of various immune-mediated diseases. However since calcineurin is is widely expressed in non-haemopoietic tissues like the kidney and the hearth, both drugs present a long term toxicity and can lead to deleterious effect to these organs[8], [9].
Cofactors:
Related health defects
Rheumatic diseases (arthritis):
Schizophrenia:
Diabetes:
