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• W2036699607 abstract "DAP-kinase (DAPk) is a Ca(2+)/calmodulin (CaM)-regulated Ser/Thr kinase that functions as a positive mediator of programmed cell death. It associates with actin microfilament and has a unique multidomain structure. One of the substrates of DAPk was identified as myosin light chain (MLC), the phosphorylation of which mediates membrane blebbing. Four additional kinases have been identified based on the high homology of their catalytic domain to that of DAPk. Yet, they differ in the structure of their extracatalytic domains and in their intracellular localization. One member of this family, DRP-1, also shares with DAPk both the property of activation by Ca(2+)/CaM and a specific phosphorylation-based regulatory mechanism. The latter involves an inhibitory type of autophosphorylation on a conserved serine at position 308, in the CaM regulatory domains of these two kinases. This phosphorylation, which occurs in growing cells, restrains the death-promoting effects of these kinases, and is specifically removed upon exposure of cells to various apoptotic stimuli. The dephosphorylation at this site increases the binding and sensitivity of each of these two kinases to their common activator-CaM. In DAPk, the dephosphorylation of serine 308 also increases the Ca(2+)/CaM-independent substrate phosphorylation. In DPR-1, it also promotes the formation of homodimers necessary for its full activity. These results are consistent with a molecular model in which phosphorylation on serine 308 stabilizes a locked conformation of the CaM regulatory domain within the catalytic cleft and simultaneously also interferes with CaM binding. In DRP-1, it introduces an additional locking device by preventing homodimerization. We propose that this unique mechanism of autoinhibition, evolved to keep these death-promoting kinases silent in healthy cells and ensures their activation only in response to apoptotic signals." @default.
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• W2036699607 date "2002-11-01" @default.
• W2036699607 modified "2023-10-11" @default.
• W2036699607 title "The DAP-kinase family of proteins: study of a novel group of calcium-regulated death-promoting kinases" @default.
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• W2036699607 doi "https://doi.org/10.1016/s1570-9639(02)00443-0" @default.
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