1mdw | pdb_00001mdw

Crystal Structure of Calcium-Bound Protease Core of Calpain II Reveals the Basis for Intrinsic Inactivation

spinqualitylabelsall models 1mdw, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mdw is a 2 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Related: 1kxr, 1kfu, 1kfx, 1dfo, 1aj5, 1alw Gene: CALPAIN II (Buffalo rat) Activity: Hydrolase, with EC number and 3.4.22.53 3.4.22.52 and 3.4.22.53 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [CAN2_RAT] Calcium-regulated non-lysosomal thiol-protease which catalyze limited proteolysis of substrates involved in cytoskeletal remodeling and signal transduction. 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 Uncontrolled activation of calpain can lead to necrotic cell death and irreversible tissue damage. We have discovered an intrinsic mechanism whereby the autolysis-generated protease core fragment of calpain is inactivated through the inherent instability of a key alpha-helix. This auto-inactivation state was captured by the 1.9 A Ca(2+)-bound structure of the protease core from m-calpain, and sequence alignments suggest that it applies to about half of the calpain isoforms. Intact calpain large subunits are also subject to this inhibition, which can be prevented through assembly of the heterodimers. Other isoforms or their released cores are not silenced by this mechanism and might contribute to calpain patho-physiologies. Calpain silencing by a reversible intrinsic mechanism.,Moldoveanu T, Hosfield CM, Lim D, Jia Z, Davies PL Nat Struct Biol. 2003 May;10(5):371-8. PMID:12665854 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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