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Plant Cell, Vol. 10, 435-450, Copyright © 1998, American Society of Plant Physiologists
Activation of the Tobacco SIP Kinase by Both a Cell WallDerived Carbohydrate Elicitor and Purified Proteinaceous Elicitins from Phytophthora spp
Shuqun Zhanga,
He Dua, and
Daniel F. Klessiga
a Waksman Institute and Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, 190 Frelinghuysen Road, Piscataway, New Jersey 08854-8020
Correspondence to:
Daniel F. Klessig, klessig{at}mbcl.rutgers.edu (E-mail), 732-445-5735 (fax).
Two purified proteinaceous fungal elicitors, parasiticein (an elicitin) and cryptogein (a ß elicitin), as well as a fungal cell wallderived carbohydrate elicitor all rapidly activated a 48-kD kinase in tobacco suspension cells. The maximum activation of this kinase paralleled or preceded medium alkalization and activation of the defense gene phenylalanine ammonialyase (PAL). In addition, the two elicitins, which also induced hypersensitive cell death, activated a 44- and a 40-kD kinase with delayed kinetics. By contrast, the cell wallderived elicitor only weakly activated the 44-kD kinase and failed to activate the 40-kD kinase. The size and substrate preference of the 48-kD kinase are reminiscent of the recently purified and cloned salicylic acidinduced protein (SIP) kinase, which is a member of the mitogen-activated protein kinase family. Antibodies raised against a peptide corresponding to the unique N terminus of SIP kinase immunoreacted with the 48-kD kinase activated by all three elicitors from Phytophthora spp. In addition, the cell wall elicitor and the salicylic acidactivated 48-kD kinase copurified through several chromatography steps and comigrated on two-dimensional gels. Based on these results, all three fungal elicitors appear to activate the SIP kinase. In addition, inhibition of SIP kinase activation by kinase inhibitors correlated with the suppression of cell wall elicitorinduced medium alkalization and PAL gene activation, suggesting a regulatory function for the SIP kinase in these defense responses.
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