Low temperature perception in plants: effects of cold on protein phosphorylation in cell‐free extracts

FEBS Letters

Labbé, Etienne¹  Monroy, Antonio F¹  Dhindsa, Rajinder S¹ 

[1] Department of Biology, McGill University, 1205 Avenue Docteur Penfield, Montréal, Québec H3A 1B1, Canada

关键词: Cold acclimation;    Cold inactivation;    Plant signal transduction;    Protein phosphorylation;   

DOI  :  10.1016/S0014-5793(97)00589-9

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Activities of prevalent protein phosphatases decreased by nearly 95% and those of individual protein kinases were differentially reduced at low temperature. Inhibition of phosphatase activity at temperatures below 12°C resulted in marked hyperphosphorylation of a 58-kDa protein (PP58). The temperature threshold for hyperphosphorylation of PP58 coincided with the known threshold for cold-induced calcium influx. Since calcium influx is triggered by several environmental stresses, we propose that the observed direct effects of cold on the phosphorylation of specific proteins enable cells to couple a shared calcium signal to a cold-specific transduction pathway.

【 授权许可】

Unknown