Protein kinase cascade involved in rapid ABA-signaling in guard cells of Vicia faba

Takuya Furuichi, Izumi C. Mori, Shoshi Muto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Protein kinases are involved in signal transduction for environmental stress responses. In response to drought and salinity, a 48-kDa protein kinase (AAPK; abscisic acid-activated protein kinase (AAPK) in guard cells is activated by abscisic acid (ABA) and phosphorylates several targets such as the carboxy-terminus of inward-rectifying K+ channel and heterogeneous mRNA binding protein to adopt to the changing environment. The AAPK expressed specifically in guard cells, and recombinant AAPK was phosphorylated only with the extract from ABA-treated guard cells but not from untreated cells. This indicates the presence of an AAPK kinase (AAPKK), which is activated by ABA and phosphorylates AAPK preceding the activation of AAPK. Both AAPK and AAPKK are involved in the protein kinase cascade for the rapid ABA-signaling.

Original languageEnglish
Pages (from-to)769-773
Number of pages5
JournalZeitschrift fur Naturforschung - Section C Journal of Biosciences
Issue number9-10
Publication statusPublished - 2005


  • Abscisic Acid (ABA)
  • Kinase Cascade
  • Protein Kinase

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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