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UDP-galactose transporter gene hUGT1 expression in tobacco plants leads to hyper-galactosylated cell wall components

Paper ID Volume ID Publish Year Pages File Format Full-Text
20120 43158 2016 11 PDF Available
Title
UDP-galactose transporter gene hUGT1 expression in tobacco plants leads to hyper-galactosylated cell wall components
Abstract

We reported previously that tobacco plants transformed with the human UDP-galactose transporter 1 gene (hUGT1-transgenic plants) displayed morphological, architectural, and physiological alterations, such as enhanced growth, increased accumulation of chlorophyll and lignin, and a gibberellin-responsive phenotype. In the present study, we demonstrated that hUGT1 expression altered the monosaccharide composition of cell wall matrix polysaccharides, such as pectic and hemicellulosic polysaccharides, which are biosynthesized in the Golgi lumen. An analysis of the monosaccharide composition of the cell wall matrix polysaccharides revealed that the ratio of galactose to total monosaccharides was significantly elevated in the hemicellulose II and pectin fractions of hUGT1-transgenic plants compared with that of control plants. A hyper-galactosylated xyloglucan structure was detected in hemicellulose II using oligosaccharide mass profiling. These results indicated that, because of the enhanced UDP-galactose transport from the cytosol to the Golgi apparatus by hUGT1, galactose incorporation in the cell wall matrix polysaccharides increased. This increased galactose incorporation may have contributed to increased galactose tolerance in hUGT1-transgenic plants.

Keywords
Transgenic plant; Nucleotide sugar transporter; Cell wall matrix; UDP-galactose; Monosaccharide
First Page Preview
UDP-galactose transporter gene hUGT1 expression in tobacco plants leads to hyper-galactosylated cell wall components
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 121, Issue 5, May 2016, Pages 573–583
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering