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Article Abstract
DAP-kinase (DAPK) is the founding member of a family of highly related, death associated Ser/Thr kinases that belongs to the calmodulin (CaM)-regulated kinase superfamily. The family includes DRP-1 and ZIP-kinase (ZIPK), both of which share significant homology within the common N-terminal kinase domain, but differ in their extra-catalytic domains. Both DAPK and DRP-1 possess a conserved CaM autoregulatory domain, and are regulated by calcium-activated CaM and by an inhibitory auto-phosphorylation within the domain. ZIPK's activity is independent of CaM but can be activated by DAPK. The three kinases share some common functions and substrates, such as induction of autophagy and phosphorylation of myosin regulatory light chain leading to membrane blebbing. Furthermore, all can function as tumor suppressors. However, they also each possess unique functions and intracellular localizations, which may arise from the divergence in structure in their respective C-termini. In this review we will introduce the DAPK family, and present a structure/function analysis for each individual member, and for the family as a whole. Emphasis will be placed on the various domains, and how they mediate interactions with additional proteins and/or regulation of kinase function.
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