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JXB Advance Access originally published online on November 28, 2003
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Journal of Experimental Botany, Vol. 55, No. 394, pp. 35-42, January 1, 2004
© 2004 Oxford University Press

Plant Carbon-Nitrogen Interactions from Rhizospheres to Planet

Highly conserved protein kinases involved in the regulation of carbon and amino acid metabolism

Received 19 May 2003; Accepted 3 October 2003

Nigel G. Halford*, Sandra Hey, Deveraj Jhurreea, Sophie Laurie, Rowan S. McKibbin, Yuhua Zhang and Matthew J. Paul

Crop Performance and Improvement, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK

* To whom correspondence should be addressed. Fax: +44 (0)1582 763010. E-mail: nigel.halford{at}bbsrc.ac.uk

It has been clear for over a decade and a half that ancient signalling pathways controlling fundamental cellular processes are highly conserved throughout the eukaryotes. Two plant protein kinases, sucrose non-fermenting 1 (SNF1)-related protein kinase (SnRK1) and general control non-derepressible 2 (GCN2)-related protein kinase are reviewed here. These protein kinases show an extraordinary level of conservation with their fungal and animal homologues given the span of time since they diverged from them. However, close examination of the signalling pathways in which they operate also reveals intriguing differences in activation and function.

Key words: Amino acid metabolism, carbon metabolism, plant protein kinases, regulation, signalling.


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