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

Identifieur interne : 000003 ( Ncbi/Checkpoint ); précédent : 000002; suivant : 000004

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

Auteurs : 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 ; Steven Ball

Source :

RBID : PMC:59358

Abstract

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 α-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, α-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.


Url:
PubMed: 10444082
PubMed Central: 59358


Affiliations:


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PMC:59358

Le document en format XML

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<p>We describe a novel mutation in the
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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
<italic>sta11</italic>
-
<italic>1</italic>
mutation causes the absence of an α-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, α-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
<italic>C. reinhardtii</italic>
.</p>
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