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Journal of Experimental Botany, Vol. 52, No. 357, pp. 691-700, April 15, 2001
© 2001 Oxford University Press

Original Papers

Zea mays CCaMK: autophosphorylation-dependent substrate phosphorylation and down-regulation by red light

Sona Pandey1,3 and Sudhir K. Sopory2

1 School of Life Sciences, Jawaharlal Nehru University, New Delhi 110067, India
2 International Centre for Genetic Engineering and Biotechnology, New Delhi 110067, India

The role of protein kinases has been extensively studied in various signal transduction pathways and they are one of the most important components that link the signal perception to the final response. However, not many studies have been reported, especially from the plant systems, that show the regulation pattern of the kinase itself under different conditions. A calcium/calmodulin-dependent protein kinase has already been purified and characterized from etiolated maize coleoptiles. In this paper a detailed study of how the kinase itself is regulated at the autophosphorylation level is provided. Evidence is also given that the autophosphorylation of kinase effects its activity towards substrate phosphorylation. It is further shown that the kinase is an important component of the light signalling pathway as the level of the kinase itself decreases by red light irradiation.

Key words: Autophosphorylation, Ca2+/CaM-dependent protein kinase, red light, Zea mays.


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