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Plant Physiology 59:719-723 (1977)
© 1977 American Society of Plant Biologists

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Articles

UDP-glucose: Glucan Synthetase in Developing Cotton Fibers

II. Structure of the Reaction Product 1

Ursula Heiniger2 and Deborah P. Delmer3

a MSU/ERDA Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

The solubility properties, composition, and structure of the radioactive product synthesized from UDP-[14C]glucose by a highly active cotton fiber glucan synthetase have been determined. Product obtained under the following three different conditions was analyzed: at high and low substrate concentrations by detached fibers, and at high substrate concentrations with an isolated particulate preparation. The results of acetic and nitric acid digestion, enzyme digestion, total acid hydrolyses, periodate oxidation, partial acid hydrolyses, and methylation analyses all support the conclusion that the product of the glucan synthetase produced under all three assay conditions is a linear {beta}-(1->3)-glucan.

2 Present address: Institut de Biologie Végétale et de Phytochimie, Université de Fribourg, 3 Rue Albert-Gockel, CH-1700 Fribourg, Switzerland.

3 To whom reprint requests should be sent.

1 Supported by the U.S. Energy Research and Development Administration under Contract E(11-1)-1338.




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Copyright © 1977 by the American Society of Plant Biologists