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Preamylopectin Processing: A Mandatory Step for Starch Biosynthesis in Plants.

G. Mouille1, M. L. Maddelein, N. Libessart

  • 1Laboratoire de Chimie Biologique, Unite Mixte de Recherche du Centre National de la Recherche Scientifique No. 111, Universite des Sciences et Technologie de Lille, 59655 Villeneuve d'Ascq Cedex, France.

The Plant Cell
|August 1, 1996
PubMed
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Storage, Photosynthesis, and Growth: The Conditional Nature of Mutations Affecting Starch Synthesis and Structure in Chlamydomonas.

The Plant cellยท1995
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A novel Chlamydomonas gene (STA7) defect causes starch loss, revealing a debranching enzyme

Area of Science:

  • Plant biochemistry
  • Molecular genetics
  • Carbohydrate metabolism

Background:

  • Starch biosynthesis traditionally involves starch synthases and branching enzymes.
  • The precise mechanisms of glucan chain elongation and branching remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular basis of starch biosynthesis in Chlamydomonas.
  • To identify novel enzymes involved in starch metabolism.

Main Methods:

  • Genetic analysis of a Chlamydomonas mutant with altered starch content (STA7 locus).
  • Enzymatic assays to characterize starch hydrolytic activities.
  • Biochemical characterization of a specific 88-kD enzyme.

Main Results:

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  • A defective STA7 locus resulted in complete starch degradation and accumulation of glycogen-like material.
  • A specific 88-kD starch hydrolytic activity was selectively lost in the mutant.
  • This enzyme was identified as a debranching enzyme crucial for starch metabolism.

    • Conclusions:

    • Starch biosynthesis involves a coordinated action of synthesis and degradation.
    • A novel debranching enzyme plays a critical role in regulating starch structure.
    • Amylopectin cluster synthesis may occur via a discontinuous mechanism involving glucan trimming.