Activation of MAPK homologues by elicitors in tobacco cells

被引:128
作者
Lebrun-Garcia, A [1 ]
Ouaked, F [1 ]
Chiltz, A [1 ]
Pugin, A [1 ]
机构
[1] Univ Bourgogne, Unite Associee, INRA, Lab Phytopharm & Biochim Interact Cellulaires, F-21034 Dijon, France
关键词
D O I
10.1046/j.1365-313X.1998.00269.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Elicitors of plant defence reactions (such as cryptogein, an elicitin produced by Phytophthora cryptogea, or oligogalacturonides (OGs)), induced in tobacco cell suspensions (Nicotiana tabacum var Xanthi) a rapid and transient activation of two protein kinases (PKs) with apparent molecular masses of 50 and 46 kDa, respectively. These PKs activated and phosphorylated at tyrosine residues, phosphorylated myelin basic protein (MBP) at serine/threonine residues. Both are recognized by anti-MAPK antibodies. The two MBP kinases possessed the same kinetics of activation, and their activation depended, to the same extent, on different exogenously applied compounds (staurosporine, lanthanum, EGTA). We demonstrate here that the activation of the MBP kinases is calcium dependent and sensitive to staurosporine, a protein kinase inhibitor which annihilates all known responses of tobacco cells to cryptogein. The activation of MBP kinases appeared to be independent of the production of active oxygen species (AOS) and insensitive to calyculin A, a protein phosphatase type 1 and 2A inhibitor. The activation of MAPKs is discussed in relation to the early responses induced by cryptogein.
引用
收藏
页码:773 / 781
页数:9
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