Cross-talk of calcium-dependent protein kinase and MAP kinase signaling.
Plants use different signalling pathways to acclimate to changing environmental conditions. Fast changes in the concentration of free Ca(2+) ions - so called Ca(2+) signals - are among the first responses to many stress situations. These signals are decoded by different types of calcium-dependent protein kinases, which - together with mitogen-activated protein kinases (MAPK) - present two major pathways that are widely used to adapt the cellular metabolism to a changing environment. Ca(2+)-dependent protein kinase (CDPK) and MAPK pathways are known to be involved in signalling of abiotic and biotic stress in animal, yeast and plant cells. In many cases both pathways are activated in response to the same stimuli leading to the question of a potential cross-talk between those pathways. Cross-talk between Ca(2+)-dependent and MAPK signalling pathways has been elaborately studied in animal cells, but it has hardly been investigated in plants. Early studies of CDPKs involved in the biotic stress response in tobacco indicated a cross-talk of CDPK and MAPK activities, whereas a recent study in Arabidopsis revealed that CDPKs and MAPKs act differentially in innate immune signalling and showed no direct cross-talk between CDPK and MAPK activities. Similar results were also reported for CDPK and MAPK activities in the salt stress response in Arabidopsis. Different modes of action are furthermore supported by the different subcellular localization of the involved kinases. In this review, we discuss recent findings on CDPK and MAPK signalling with respect to potential cross-talk and the subcellular localization of the involved components.
Department of Biochemistry and Cell Biology, MFPL, University of Vienna, Vienna, Austria.
Bernhard
B
Wurzinger
Andrea
A
Mair
Barbara
B
Pfister
Markus
M
Teige
D000818:Animals; D020935:MAP Kinase Signaling System; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D010944:Plants / Q000201:enzymology*; D011494:Protein Kinases / Q000378:metabolism*; D013312:Stress, Physiological; D013347:Subcellular Fractions / Q000201:enzymology; D017871:Calcium-Calmodulin-Dependent Protein Kinases
D020928:Mitogen-Activated Protein Kinases; D011494:Protein Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases
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