4orb

Crystal structure of mouse calcineurin

spinqualitylabelsall models 4orb, resolution 3.11Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4orb is a 2 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.108Å Ligands: CA, FE, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PP2BA_MOUSE Calcium-dependent, calmodulin-stimulated protein phosphatase. Many of the substrates contain a PxIxIT motif. This subunit may have a role in the calmodulin activation of calcineurin. Dephosphorylates DNM1L and HSPB1 (By similarity). Dephosphorylates SSH1. Publication Abstract from PubMed The Ca(2+)/calmodulin-dependent protein phosphatase calcineurin (CN), a heterodimer composed of a catalytic subunit A and an essential regulatory subunit B, plays critical functions in various cellular processes such as cardiac hypertrophy and T cell activation. It is the target of the most widely used immunosuppressants for transplantation, tacrolimus (FK506) and cyclosporin A. However, the structure of a large part of the CNA regulatory region remains to be determined, and there has been considerable debate concerning the regulation of CN activity. Here, we report the crystal structure of full-length CN (beta isoform), which revealed a novel autoinhibitory segment (AIS) in addition to the well-known autoinhibitory domain (AID). The AIS nestles in a hydrophobic intersubunit groove, which overlaps the recognition site for substrates and immunosuppressant-immunophilin complexes. Indeed, disruption of this AIS interaction results in partial stimulation of CN activity. More importantly, our biochemical studies demonstrate that calmodulin does not remove AID from the active site, but only regulates the orientation of AID with respect to the catalytic core, causing incomplete activation of CN. Our findings challenge the current model for CN activation, and provide a better understanding of molecular mechanisms of CN activity regulation. Cooperative autoinhibition and multi-level activation mechanisms of calcineurin.,Li SJ, Wang J, Ma L, Lu C, Wang J, Wu JW, Wang ZX Cell Res. 2016 Mar;26(3):336-49. doi: 10.1038/cr.2016.14. Epub 2016 Jan 22. PMID:26794871 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calcineurin 3D structures

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