Journal of Experimental Botany, Vol. 54, No. 382, pp. 595-604,
January 1, 2003
© 2003 Oxford University Press
Function and specificity of 14-3-3 proteins in the regulation of carbohydrate and nitrogen metabolism
Received 13 September 2002; Accepted 26 September 2002
University of Cambridge, Department of Plant Sciences, Downing Site, Cambridge CB2 3EA, UK
1 To whom correspondence should be addressed. Fax: +44 (0)1223 333953. E-mail: trm23{at}cam.ac.uk
Abbreviations: AICAR, 5-aminoimidazole-4-carboxamide riboside; GS, glutamine synthetase; NIP, nitrate reductase inhibitor protein; NR, nitrate reductase; PM, plasma membrane; SPS, sucrose-phosphate synthase.
Protein phosphorylation is key to the regulation of many proteins. Altered protein activity often requires the interaction of the phosphorylated protein with a class of ‘adapters’ known as 14-3-3 proteins. This review will cover aspects of 14-3-3 interaction with key proteins of carbon and nitrogen metabolism such as nitrate reductase, glutamine synthetase and sucrose-phosphate synthase. It will also address 14-3-3 involvement in signal transduction pathways with emphasis on the regulation of plant metabolism. To date, 14-3-3 proteins have been identified and studied in many diverse systems, yielding a plethora of data, requiring careful analysis and interpretation. Problems such as these are not uncommon when dealing with multigene families. The number of isoforms makes the question of redundancy versus specificity of 14-3-3 proteins a crucial one. This issue is discussed in relation to structure, function and expression of 14-3-3 proteins.
Key words: ATPase, C/N metabolism, metabolic signalling, multigene family, nitrate reductase, 14-3-3 proteins, regulation, sucrose-phosphate synthase.
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