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Caspase-3 shares many of the typical characteristics common to all currently-known caspases. For example, its active site contains a cysteine residue (Cys-163) and histidine residue (His-121) that stabilize the peptide bond cleavage of a protein sequence to the carboxy-terminal side of an aspartic acid when it is part of a particular 4-amino acid sequence.
During apoptosis, the apoptotic effector caspase, caspase-3, cleaves ICAD and thus causes CAD to become activated. [7] A nucleosome, consisting of DNA (grey) wrapped around a histone tetramer (coloured). In apoptotic DNA fragmentation, the DNA is cleaved in the internucleosomal linker region, which is the part of the DNA not wrapped around the ...
Simple explanation of the mechanisms of apoptosis triggered by internal signals (bcl-2), along the caspase-9, caspase-3 and caspase-7 pathway; and by external signals (FAS and TNF), along the caspase 8 pathway. Accessed 25 March 2007. Apoptosis & Caspase 7, PMAP-animation; Caspases at the U.S. National Library of Medicine Medical Subject ...
Caspase-3 is activated in the apoptotic cell. [9] Caspase-3 activation is a cell requirement during early stages of the skeletal myoblast differentiation. Its catalytic site involves sulfohydryl group of Cys-285 and the imidazole ring of its His-237. The caspase-3 His-237 stabilizes the target Aspartate causing the break of the association of ...
While in vitro cleavage by caspase occurs throughout the caspase family, preliminary data suggest that caspase-3 and caspase-7 are responsible for in vivo cleavage. Cleavage occurs at aspartic acid 214 and glycine 215, separating PARP into a 24 kDa and 89 kDa segment. The smaller moiety includes the zinc finger motif requisite in DNA binding.
Caspase-3, an executioner caspase in apoptosis, can cleave gasdermin E (GSDME) to produce a N-terminal fragment and a C-terminal fragment in a way similar to GSDMD cleavage. [3] When apoptotic cells are not scavenged by macrophages, GSDME expression is then upregulated by p53. GSDME is then activated by caspase-3 to form pores on the cell membrane.
Regarding the activation of caspases, there exists a gene called ced-9 in C. elegans that protects against cell death that is a part of the Bcl-2 family. ced-9 encodes a protein that is structurally similar to Bcl-2 that binds to another protein ced-4, a homolog of APAF-1 in humans, and prevents it from activating caspase ced-3, which is necessary for killing of the cell. [4]
The death-effector domain (DED) is a protein interaction domain found only in eukaryotes that regulates a variety of cellular signalling pathways. [2] The DED domain is found in inactive procaspases (cysteine proteases) and proteins that regulate caspase activation in the apoptosis cascade such as FAS-associating death domain-containing protein ().
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