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THE PLANT CELL, Vol 8, Issue 7 1121-1135, Copyright © 1996 by American Society of Plant Biologists

RESEARCH ARTICLES

Identification of the Major Starch Synthase in the Soluble Fraction of Potato Tubers

J. Marshall, C. Sidebottom, M. Debet, C. Martin, A. M. Smith and A. Edwards
John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom

The major isoform of starch synthase from the soluble fraction of developing potato tubers has been purified and used to prepare an antibody and isolate a cDNA. The protein is 140 kD, and it is distinctly different in predicted primary amino acid sequence from other isoforms of the enzyme thus far described. Immunoinhibition and immunoblotting experiments and analysis of tubers in which activity of the isoform was reduced through expression of antisense mRNA revealed that the isoform accounts for ~80% of the activity in the soluble fraction of the tuber and that it is also bound to starch granules. Severe reductions in activity had no discernible effect on starch content or amylose-to-amylopectin ratio of starch in tubers. However, they caused a profound change in the morphology of starch granules, indicative of important underlying changes in the structure of starch polymers within the granule.


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