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JXB Advance Access originally published online on March 26, 2004
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Journal of Experimental Botany, Vol. 55, No. 400, pp. 1245-1254, May 1, 2004
© 2004 Oxford University Press

Photosynthetic Carbon Fluxes

Emergence of new regulatory mechanisms in the Benson–Calvin pathway via protein–protein interactions: a glyceraldehyde-3-phosphate dehydrogenase/CP12/phosphoribulokinase complex

Received 11 September 2003; Accepted 16 January 2004

Emmanuelle Graciet*, Sandrine Lebreton and Brigitte Gontero{dagger}

Laboratoire d’ingéniérie des protéines et contrôle métabolique, Département Biologie des génomes, Institut Jacques Monod, UMR 7592 CNRS, Universités Paris VI-VII, 2 place Jussieu, F-75251 Paris cedex 05, France

* Present address: California Institute of Technology, Division of Biology, 147-75, 1200 East California Blvd., Pasadena, CA 91125, USA.
Abbreviations, GAPDH, glyceraldehyde-3-phosphate dehydrogenase; PRK, phosphoribulokinase; FBPase, fructose 1;6-bisphosphatase; RubisCO, ribulose bisphosphate carboxylase/oxygenase; SBPase, sedoheptulose 1;7-bisphosphatase; PRI, phosphoribose isomerase; PGK, phosphoglycerate kinase; DTT, dithiothreitol; PGA, 3-phosphoglyceric acid; BPGA, 1;3-biphosphoglyceric acid; RuBP, ribulose 1;5-bisphosphate; Ru5P, ribulose 5-phosphate; IUPs, intrinsically unstructured proteins.
{dagger} To whom correspondence should be addressed. Fax: +33 1 44 27 57 16. E-mail: meunier{at}ijm.jussieu.fr

Protein–protein interactions are involved in many metabolic pathways. This review will focus on the role of such associations in CO2 assimilation (Benson–Calvin cycle) and especially on the involvement of a GAPDH/CP12/PRK complex which has been identified in many photosynthetic organisms and may have an important role in the regulation of CO2 assimilation. The emergence of new kinetic and regulatory properties as a consequence of protein–protein interactions will be addressed as well as some of the questions raised by the existence of these supramolecular complexes such as composition, function, and assembly pathways. The presence and role of small intrinsically unstructured proteins like the 8.5 kDa protein CP12, involved in the regulation and/or assembly of these complexes will be discussed.

Key words: Benson–Calvin cycle, CP12, glyceraldehyde-3-phosphate dehydrogenase, multienzyme complex assembly, phosphoribulokinase, protein–protein interactions.


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