Involvement of mitogen-activated protein kinase activation in the signal-transduction pathways of the soya bean oxidative burst

The Biochemical Journal
A T TaylorP S Low

Abstract

The oxidative burst constitutes one of the most rapid defence responses characterized in the Plant Kingdom. We have observed that four distinct elicitors of the soya bean oxidative burst activate kinases of masses approximately 44 kDa and approximately 47 kDa. Evidence that these kinases regulate production of reactive oxygen species include: (i) their rapid activation by oxidative burst elicitors, (ii) their tight temporal correlation between activation/deactivation of the kinases and activation/deactivation of the oxidative burst, (iii) the identical pharmacological profile of kinase activation and oxidant production for 13 commonly used inhibitors, and (iv) the autologous activation of both kinases and oxidant production by calyculin A and cantharidin, two phosphatase inhibitors. Immunological and biochemical studies reveal that the activated 44 kDa and 47 kDa kinases are mitogen-activated protein (MAP) kinase family members. The kinases prefer myelin basic protein as a substrate, and they phosphorylate primarily on threonine residues. The kinases are themselves phosphorylated on tyrosine residues, and this phosphorylation is required for activity. Finally, both kinases are recognized by an antibody against activated MAP kin...Continue Reading

Citations

Apr 16, 2003·The Plant Journal : for Cell and Molecular Biology·Yidong LiuShuqun Zhang
Jul 9, 2008·Planta·Yardena Gueta-DahanGozal Ben-Hayyim
Aug 13, 2003·Plant Physiology·Sidney L Shaw, Sharon R Long

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