4okh

Crystal structure of calpain-3 penta-EF-hand domain

spinqualitylabelsall models 4okh, resolution 2.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4okh is a 3 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.45Å Ligands: CA, PEU Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease CAN3_HUMAN Autosomal recessive limb girdle muscular dystrophy type 2A. The disease is caused by mutations affecting the gene represented in this entry. Function CAN3_HUMAN Calcium-regulated non-lysosomal thiol-protease. Publication Abstract from PubMed Calpains are Ca(2+) dependent intracellular cysteine proteases that cleave a wide range of protein substrates to help implement Ca(2+) signaling in the cell. The major isoforms of this enzyme family, calpain-1 and calpain-2, are heterodimers of a large and a small subunit, with the main dimer interface being formed through their C-terminal penta-EF hand (PEF) domains. Calpain-3, or p94, is a skeletal muscle-specific isoform that is genetically linked to limb-girdle muscular dystrophy. Biophysical and modeling studies with the PEF domain of calpain-3 support the suggestion that full-length calpain-3 exists as a homodimer. Here, we report the crystallization of calpain-3's PEF domain and its crystal structure in the presence of Ca(2+) , which provides evidence for the homodimer architecture of calpain-3 and supports the molecular model that places a protease core at either end of the elongated dimer. Unlike other calpain PEF domain structures, the calpain-3 PEF domain contains a Ca(2+) bound at the EF5-hand used for homodimer association. Three of the four Ca(2+) -binding EF-hands of the PEF domains are concentrated near the protease core, and have the potential to radically change the local charge within the dimer during Ca(2+) signaling. Examination of the homodimer interface shows that there would be steric clashes if the calpain-3 large subunit were to try to pair with a calpain small subunit. Database Structural data are available in the Protein Data Bank database under accession number 4OKH. STRUCTURED DIGITAL ABSTRACT: Calpain-3 and Calpain-3 bind by x-ray crystallography (View interaction). Crystal structure of calpain-3 penta-EF-hand (PEF) domain - a homodimerized PEF family member with calcium bound at the fifth EF-hand.,Partha SK, Ravulapalli R, Allingham JS, Campbell RL, Davies PL FEBS J. 2014 Jul;281(14):3138-49. doi: 10.1111/febs.12849. Epub 2014 Jun 9. PMID:24846670 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Calpain 3D structures

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