Salicylic acid activates a 48-kD MAP kinase in tobacco.

  title={Salicylic acid activates a 48-kD MAP kinase in tobacco.},
  author={Shengjun Zhang and Daniel F Klessig},
  journal={The Plant cell},
  volume={9 5},
The involvement of phosphorylation/dephosphorylation in the salicylic acid (SA) signal transduction pathway leading to pathogenesis-related gene induction has previously been demonstrated using kinase and phosphatase inhibitors. Here, we show that in tobacco suspension cells, SA induced a rapid and transient activation of a 48-kD kinase that uses myelin basic protein as a substrate. This kinase is called the p48 SIP kinase (for SA-Induced Protein kinase). Biologically active analogs of SA… CONTINUE READING
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