Cloning and Characterization of AtRGP1¹
A Reversibly Autoglycosylated Arabidopsis Protein Implicated in Cell Wall Biosynthesis

Ivan J. Delgado, Zhaohong Wang, Amy de Rocher, Kenneth Keegstra, and Natasha V. Raikhel^*

Michigan State University, Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312

A reversibly glycosylated polypeptide from pea (Pisum sativum) is thought to have a role in the biosynthesis of hemicellulosic polysaccharides. We have investigated this hypothesis by isolating a cDNA clone encoding a homolog of Arabidopsis thaliana, Reversibly Glycosylated Polypeptide-1 (AtRGP1), and preparing antibodies against the protein encoded by this gene. Polyclonal antibodies detect homologs in both dicot and monocot species. The patterns of expression and intracellular localization of the protein were examined. AtRGP1 protein and RNA concentration are highest in roots and suspension-cultured cells. Localization of the protein shows it to be mostly soluble but also peripherally associated with membranes. We confirmed that AtRGP1 produced in Escherichia coli could be reversibly glycosylated using UDP-glucose and UDP-galactose as substrates. Possible sites for UDP-sugar binding and glycosylation are discussed. Our results are consistent with a role for this reversibly glycosylated polypeptide in cell wall biosynthesis, although its precise role is still unknown.

Plant Physiol. (1998) 116: 1339-1350
Copyright Clearance Center:   0032-0889/98/116/1339/12
© 1998 American Society of Plant Physiologists

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