2w73 | pdb_00002w73

High-resolution structure of the complex between calmodulin and a peptide from calcineurin A

spinqualitylabelsall models 2w73, resolution 1.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2w73 is a 8 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Related: 1j7p, 2f3z, 1mf8, 1nkf, 2jl2, 1xfv, 1k93, 1sk6, 1y6w, 1iwq, 1k90, 1yrt, 1lvc, 1cll, 1cdl, 1xfu, 1xfy, 2f3y, 1xfx, 1s26, 1j7o, 1aui, 1yru, 1wrz, 2v02, 1xfz, 1xfw, 2v01, 1pk0, 1m63, 2be6, 1zot, 1sw8, 2vay, 1aji Activity: Phosphoprotein phosphatase, with EC number 3.1.3.16 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [PP2BA_HUMAN] Calcium-dependent, calmodulin-stimulated protein phosphatase. This subunit may have a role in the calmodulin activation of calcineurin. Dephosphorylates DNM1L, HSPB1 and SSH1. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Calmodulin (CaM) is a ubiquitously expressed calcium sensor that engages in regulatory interactions with a large number of cellular proteins. Previously, a unique mode of CaM target recognition has been observed in the crystal structure of a complex between CaM and the CaM-binding domain of calcineurin A. METHODOLOGY/PRINCIPAL FINDINGS: We have solved a high-resolution crystal structure of a complex between CaM and the CaM-binding domain of calcineurin A in a novel crystal form, which shows a dimeric assembly of calmodulin, as observed before in the crystal state. We note that the conformation of CaM in this complex is very similar to that of unliganded CaM, and a detailed analysis revels that the CaM-binding motif in calcineurin A is of a novel '1-11' type. However, using small-angle X-ray scattering (SAXS), we show that the complex is fully monomeric in solution, and a structure of a canonically collapsed CaM-peptide complex can easily be fitted into the SAXS data. This result is also supported by size exclusion chromatography, where the addition of the ligand peptide decreases the apparent size of CaM. In addition, we studied the energetics of binding by isothermal titration calorimetry and found them to closely resemble those observed previously for ligand peptides from CaM-dependent kinases. CONCLUSIONS/SIGNIFICANCE: Our results implicate that CaM can also form a complex with the CaM-binding domain of calcineurin in a 1 ratio 1 stoichiometry, in addition to the previously observed 2 ratio 2 arrangement in the crystal state. At the structural level, going from 2 ratio 2 association to two 1 ratio 1 complexes will require domain swapping in CaM, accompanied by the characteristic bending of the central linker helix between the two lobes of CaM. Domain swapping and different oligomeric States for the complex between calmodulin and the calmodulin-binding domain of calcineurin a.,Majava V, Kursula P PLoS ONE. 2009;4(4):e5402. Epub 2009 Apr 30. PMID:19404396 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calcineurin 3D structures Calmodulin 3D structures

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