Plant Physiol.
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Plant Physiology 64:914-918 (1979)
© 1979 American Society of Plant Biologists

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Articles

Intracellular Localization of GDP-Fucose

Polysaccharide Fucosyl Transferase in Corn Roots (Zea mays L.) 1

Douglas W. James, Jr.2 and Russell L. Jones3

a Department of Botany, University of California, Berkeley, California 94720

The intracellular site of synthesis of the fucose-rich polysaccharide slime secreted by corn roots was localized by monitoring the distribution of GDP-fucose:polysaccharide fucosyl transferase activity in subcellular fractions of corn roots. Root tip sections were chopped in the presence of 0.56 molar sucrose and 100 millimolar Tris (pH 7.0). After a brief centrifugation, the homogenate was applied to a Sepharose 4B column (1.5 x 30 cm). The turbid, particulate portion of the supernatant fraction eluted at the void volume. Ninety per cent of the enzyme activity was found in the pooled particulate fractions. The particulate fraction was purified on linear sucrose gradients. Gradient fractions were characterized by buoyant density, 280 nanometer absorbance, electron microscope observation, and distributions of NADH-cytochrome c oxidoreductase and fucosyl transferase activities.

Two peaks of fucosyl transferase activity were observed: one in fractions rich in smooth endoplasmic reticulum, and another in fractions rich in dictyosome cisternae and dictyosome vesicles. The data suggest that the synthesis of corn root slime begins in the endoplasmic reticulum and is completed in the dictyosomes prior to secretion; however, the possibility that more than one fucosyl transferase exists in corn roots is discusses.

2 Present address: Department of Biochemistry, University of Texas Health Science Center, San Antonio, Texas 78284.

3 To whom reprint requests should be sent.

1 This research was supported by National Science Foundation Grant PCM 75-18870.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1979 by the American Society of Plant Biologists