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Plant Physiology 66:1128-1134 (1980)
© 1980 American Society of Plant Biologists

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Articles

Structure of Plant Cell Walls

X. RHAMNOGALACTURONAN I, A STRUCTURALLY COMPLEX PECTIC POLYSACCHARIDE IN THE WALLS OF SUSPENSION-CULTURED SYCAMORE CELLS 1

Michael McNeil, Alan G. Darvill and Peter Albersheim2

Department of Chemistry, University of Colorado, Boulder, Colorado 80309

The purification and characterization of a pectic polymer, rhamnogalacturonan I, present in the primary cell walls of dicots is described. Rhamnogalacturonan I accounts for approximately 7% of the mass of the walls isolated from suspension-cultured sycamore cells. As purified, rhamnogalacturonan I has a molecular weight of approximately 200,000 and is composed primarily of L-rhamnosyl, D-galacturonosyl, L-arabinosyl, and D-galactosyl residues. The backbone of rhamnogalacturonan I is thought to be composed predominantly of D-galacturonosyl and L-rhamnosyl residues in a ratio of approximately 2:1. About half of the L-rhamnosyl residues are 2-linked and are glycosidically attached to C4 of a D-galacturonosyl residue. The other half of the L-rhamnosyl residues are 2,4-linked and have a D-galacturonosyl residue glycosidically attached at C2. Sidechains averaging 6 residues in length are attached to C4 of the L-rhamnosyl residues. There are many different sidechains, containing variously linked L-arabinosyl, and/or D-galactosyl residues.

2 To whom correspondence should be addressed.

1 This work was supported by United States Department of Energy Contract EY-76-S-02-1426.




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