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JXB Advance Access published online on December 12, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erh012
© 2003 by Oxford University Press
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Received April 7, 2003; accepted July 29, 2003
© 2003 Society for Experimental Biology

CROSS-TALK IN PLANT SIGNAL TRANSDUCTION SPECIAL ISSUE ARTICLE

From signal to cell polarity: mitogen-activated protein kinases as sensors and effectors of cytoskeleton dynamicity

Jozef Samaj 1*, Frantisek Baluska 2, and Heribert Hirt 3

1 Institute of Cellular and Molecular Botany, University of Bonn, Kirschallee 1, D-53115 Bonn, Germany; Institute of Plant Genetics and Biotechnology, Slovak Academy of Sciences, Akademicka 2, SK-949 01 Nitra, Slovak Republic
2 Institute of Cellular and Molecular Botany, University of Bonn, Kirschallee 1, D-53115 Bonn, Germany; Institute of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK-84223 Bratislava, Slovak Republic
3 Max F. Perutz Laboratories and Gregor-Mendel-Institute of Molecular Plant Sciences, Vienna Biocenter, Dr. Bohrgasse 9, A-1030 Vienna, Austria

* To whom correspondence should be addressed. E-mail: jozef.samaj{at}uni-bonn.de.


  Abstract

Mitogen-activated protein kinases (MAPKs) are ubiquitous phosphorylation enzymes involved in signal transduction, gene expression and activation of diverse cytoskeletal proteins. MAPKs participate in the regulation of a broad range of crucial cellular processes including cell survival, division, polarization, stress responses, and metabolism. Phosphorylation of cytoskeletal proteins usually results in the rearrangement of cytoskeletal arrays leading to morphological changes and cell polarization. On the other hand, some cytoskeletal motor proteins, such as kinesins, could activate MAPK members and participate in signal delivery to the proper cellular destination (e.g. during cell division). Moreover, changes in the integrity of cytoskeletal elements have direct impacts on MAPK activity. Recent evidence suggests that there is bi-directional signalling between MAPK cascades and cytoskeleton. The focus here is on this cross-talk between MAPK signalling and the cytoskeleton in various eukaryotic systems including yeast, plants, and mammals and a role is proposed for MAPKs as sensors monitoring the cytoskeleton-dependent balance of forces within the cell.

Key words: Actin filaments, cytoskeleton, kinesin, microtubules, mitogen-activated protein kinases, signalling, tip-growth.


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