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. 2020 Dec 15;11:610377. doi: 10.3389/fpls.2020.610377

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Copyright © 2020 Silva, Ferraz, Dupree, Showalter and Coimbra.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Model structure of type II arabinogalactan polysaccharides (AGs) and sites of action of known glycosyltransferases (GTs) and glycoside hydrolases (GHs) acting on AGPs. Type II AGs are O-glycosidically linked to hydroxyproline (Hyp) and consist of a β-(1→3)-linked backbone of galactose (Gal) with β-(1→6)-galactan side chains. Further modifications involve the addition of arabinose (Ara), fucose (Fuc), rhamnose (Rha), glucuronic acid (GlcA), 4-O-methylglucuronosyl (4-O-MeGlcA), and xylose (Xyl). Solid line arrows (left) represent sites of action of GTs and dotted line arrows (right) indicate sites of action of GHs. This structure is based on AGs analyzed from Arabidopsis leaves (Tryfona et al., 2012).