Death-associated protein kinase 2 is a new calcium/calmodulin-dependent protein kinase that signals apoptosis through its catalytic activity

Taro Kawai, Fumiko Nomura, Katsuaki Hoshino, Neal G. Copeland, Debra J. Gilbert, Nancy A. Jenkins, Shizuo Akira

Research output: Contribution to journalArticle

100 Scopus citations

Abstract

We have identified and characterized a new calcium/calmodulin (Ca2+/CaM) dependent protein kinase termed death-associated protein kinase 2 (DAPK2) that contains an N-terminal protein kinase domain followed by a conserved CaM-binding domain with significant homologies to those of DAP kinase, a protein kinase involved in apoptosis. DAPK2 mRNA is expressed abundantly in heart, lung and skeletal muscle. The mapping results indicated that DAPK2 is located in the central region of mouse chromosome 9. In vitro kinase assay revealed that DAPK2 is autophosphorylated and phosphorylates myosin light chain (MLC) as an exogenous substrate. DAPK2 binds directly to CaM and is activated in a Ca2+/CaM-dependent manner. A constitutively active DAPK2 mutant is generated by removal of the CaM-binding domain (ΔCaM). Treatment of agonists that elevate intracellular Ca2+-concentration led to the activation of DAPK2 and transfection studies revealed that DAPK2 is localized in the cytoplasm. Overexpression of DAPK2, but not the kinase negative mutant, significantly induced the morphological changes characteristic of apoptosis. These results indicate that DAPK2 is an additional member of DAP kinase family involved in apoptotic signaling.

Original languageEnglish (US)
Pages (from-to)3471-3480
Number of pages10
JournalOncogene
Volume18
Issue number23
DOIs
StatePublished - Jun 10 1999

Keywords

  • Apoptosis
  • Calcium/calmodulin-dependent kinase
  • DAP kinase family

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

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