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Genetic and Biochemical Evidence for the Involvement of alpha -1,4 Glucanotransferases in Amylopectin Synthesis1

Christophe Colleoni, David Dauvillée, Gregory Mouille, Alain Buléon, Daniel Gallant, Brigitte Bouchet, Matthew Morell, Michael Samuel, Brigitte Delrue, Christophe d'Hulst, Christophe Bliard, Jean-Marc Nuzillard, and Steven Ball*

Laboratoire de Chimie Biologique, Unité Mixte de Recherche du Centre National de la Recherche Scientifique no. 8576, Université des Sciences et Technologies de Lille, 59655 Villeneuve D'Ascq cedex France (C.C., D.D., G.M., B.D., C.d.H., S.B.); Institut National de la Recherche Agronomique, Centre de Recherches Agroalimentaires, Rue de la Géraudière, B.P. 71627, 44316 Nantes cedex 03, France (A.B., D.G., B.B.); Commonwealth Scientific and Industrial Research Organization, Division of Plant Industry, G.P.O. Box 1600, Canberra, Australian Capital Territory 2601, Australia (M.M., M.S.); and Laboratoire de Pharmacognosie, Groupe de Glycotechnie, Université de Reims, Moulin de la Housse-BP 1039, 51097 Reims cedex 2, France (C.B., J.-M.N.)

We describe a novel mutation in the Chlamydomonas reinhardtii STA11 gene, which results in significantly reduced granular starch deposition and major modifications in amylopectin structure and granule shape. This defect simultaneously leads to the accumulation of linear malto-oligosaccharides. The sta11-1 mutation causes the absence of an alpha -1,4 glucanotransferase known as disproportionating enzyme (D-enzyme). D-enzyme activity was found to be correlated with the amount of wild-type allele doses in gene dosage experiments. All other enzymes involved in starch biosynthesis, including ADP-glucose pyrophosphorylase, debranching enzymes, soluble and granule-bound starch synthases, branching enzymes, phosphorylases, alpha -glucosidases (maltases), and amylases, were unaffected by the mutation. These data indicate that the D-enzyme is required for normal starch granule biogenesis in the monocellular alga C. reinhardtii.

1   This work was supported by grants from the Ministère de l'Education Nationale, by the Centre National de la Recherche Scientifique (Unité Mixte de Recherche du Centre National de la Recherche Scientifique no. 8576, Director André Verbert), by the University of Lille, by the University of Reims, and by a grant from Biogemma (Cambridge, UK).
*   Corresponding author; e-mail steven.ball{at}univ-lille1.fr; fax 33-3-20-43-65-55.

Plant Physiol. (1999) 120: 993-1004
Copyright Clearance Center:   0032-0889/99/120//12
© 1999 American Society of Plant Physiologists




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