Abstract
Polyamines are essential for growth and development in prokaryotic and eukaryotic organisms. In this study, we report the effect of cadaverine, putrescine, spermidine and spermine on the phosphorylation of soluble and plasma membrane proteins of tobacco, cucumber and Arabidopsis thaliana. Except for the enhanced phosphorylation of several cucumber soluble proteins, cadaverine had little or no effect on the phosphorylation of soluble and plasma membrane proteins of the three plants. In tobacco, putrescine increased the phosphorylation of some soluble proteins and had no effect on the phosphorylation of plasma membrane proteins, whereas spermidine and spermine decreased the overall phosporylation of soluble proteins but enhanced the phosphorylation of three plasma membrane proteins with molecular weights of 16.5, 34 and 60 kDa. Spermidine had a stronger effect on the phosphorylation of tobacco plasma membrane proteins than spermine and had concentration optimum of ca. 6 mM. Putrescine, spermidine and spermine enhanced the phosphorylation of some soluble proteins from A. thaliana and cucumber and decreased the phosphorylation of others. The three polyamines enhanced the phosphorylation of many plasma membrane proteins. Polyamines increased serine and threonine phosphorylation of plasma membrane proteins prepared from tobacco.
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