Structure and function of the primary cell walls of plants.

TLDR: All glycosyl residues (except the residue at the reducing end of an oligosaccharide, which is called a glycose residue) are glycosidically linked at C-l and this fact is assumed in the notation used, and, thus, C-\ is not mentioned.

Abstract: 1 Abbreviations and conventions used: AceA, aceric acid (3-C-carboxy-5-deoxy-L-xylose); Api, apiose; Ara, arabinose; Fuc, fucose; Gal, galactose; GalVA, galacturonic acid; Glc, glucose; GlcA, glucuronic acid; Rha, rhamnose; Xyl, xylose; PGA lyase, endo-IX-I,4polygalacturonic acid lyase; and PIIF, Proteinase Inhibitor Inducing Factor. All glycosyl residues are in the pyranoid ring form unless the furanoid form is indicated, e.g. Ara! Standard D and L notations are used when the absolute configuration of a particular glycosyl residue has been experimentally determined. When the absolute configuration has not been experiment­ ally determined, we omit the D or L notation, although in all cases studied the glycosyl residues Gal, Glc, Xyl, GalA, and GlcA have been found in the D configuration, and the glycosyl residues Fuc, Ara, and Rha in the L configuration. We use in this review a simplified linkage notation. All glycosyl residues (except the residue at the reducing end of an oligosaccharide, which is called a glycose residue) are glycosidically linked at C-l. This fact is assumed in the notation used, and, thus, C-\ is not mentioned. For example, a glycosyl residue designated as "terminal" (T) is glycosidically linked to another glycosyl or glycose residue only through C-J and contains no glycosyl residues linked to it. A glycosyl residue designated as 2-linked is glycosidicaUy linked to another glycosyl or glycose residue through C-J and has another glycosyl residue linked to it at 0-2. A glycosyl residue designated as 3,6-linked is glycosidically linked to another sugar through C-l and has glycosyl residues linked to it at 0-3 and 0-6; therefore, such a residue represents a branch point in a complex carbohydrate. The linkage from C l is also assumed in the notation for oligosac­ charides. Thus, L-Fuc � 2-D-Gal is a disaccharide in which an L-fucosyl residue is attached by an ()(-glycosidic bond from its C-l to 0-2 of a D-galactose residue. 2 Present address: Department of Bot<my, University of Edinburgh, Edinburgh EH9 3JH, Scotland.