4hex | pdb_00004hex

A novel conformation of calmodulin

spinqualitylabelsall models 4hex, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hex 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. Ligands: CA, ZN Gene: Cam (Mus musculus) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Calmodulin (CaM) is a highly conserved eukaryotic protein that binds specifically to more than 100 target proteins in response to calcium (Ca(2+)) signal. CaM adopts a considerable degree of structural plasticity to accomplish this physiological role; however, the nature and extent of this plasticity remain to be fully understood. Here, we report the crystal structure of a novel trans conformation of ligand-free CaM where the relative disposition of two lobes of CaM is different, a conformation to-date not reported. While no major structural changes were observed in the independent N- and C-lobes as compared with previously reported structures of Ca(2+)/CaM, the central helix was tilted by approximately 90 degrees at Arg75. This is the first crystal structure of CaM to show a drastic conformational change in the central helix, and reveals one of several possible conformations of CaM to engage with its binding partner. A novel trans conformation of ligand-free calmodulin.,Kumar V, Chichili VP, Tang X, Sivaraman J PLoS One. 2013;8(1):e54834. doi: 10.1371/journal.pone.0054834. Epub 2013 Jan 29. PMID:23382982 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calmodulin

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