4jr2 | pdb_00004jr2

Human procaspase-7/caspase-7 heterodimer bound to Ac-DEVD-CMK

spinqualitylabelsall models 4jr2, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4jr2 is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 0QE, ACE, CL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CASP7_HUMAN Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves and activates sterol regulatory element binding proteins (SREBPs). Proteolytically cleaves poly(ADP-ribose) polymerase (PARP) at a '216-Asp-|-Gly-217' bond. Overexpression promotes programmed cell death. Publication Abstract from PubMed Procaspase-3 (P3) and procaspase-7 (P7) are activated through proteolytic maturation to form caspase-3 (C3) and caspase-7 (C7), respectively, which serve overlapping but nonredundant roles as the executioners of apoptosis in humans. However, it is unclear if differences in P3 and P7 maturation mechanisms underlie their unique biological functions, as the structure of P3 remains unknown. Here, we report structures of P3 in a catalytically inactive conformation, structures of P3 and P7 bound to covalent peptide inhibitors that reveal the active conformation of the zymogens, and the structure of a partially matured C7:P7 heterodimer. Along with a biochemical analysis, we show that P3 is catalytically inactive and matures through a symmetric all-or-nothing process. In contrast, P7 contains latent catalytic activity and matures through an asymmetric and tiered mechanism, suggesting a lower threshold for activation. Finally, we use our structures to design a selection strategy for conformation specific antibody fragments that stimulate procaspase activity, showing that executioner procaspase conformational equilibrium can be rationally modulated. Our studies provide a structural framework that may help to explain the unique roles of these important proapoptotic enzymes, and suggest general strategies for the discovery of proenzyme activators. Structural snapshots reveal distinct mechanisms of procaspase-3 and -7 activation.,Thomsen ND, Koerber JT, Wells JA Proc Natl Acad Sci U S A. 2013 May 21;110(21):8477-82. doi:, 10.1073/pnas.1306759110. Epub 2013 May 6. PMID:23650375 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Caspase 3D structures

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