Abstract:In plant cell walls, the hydroxyproline-rich glycoproteins (HRGPs) such as extensin contain oligoarabinofuranoside linked to a hydroxyproline (Hyp) residue. The mature arabinooligosaccharide was revealed to be a tetrasaccharide (α-l-Araf-, whose linkages are targets of the bifidobacterial and Xanthomonas arabinooligosaccharide-degrading enzymes. The l-Araf 4 motif was cleaved by GH43 α-l-arabinofuranosidase (Arafase) and converted to an l-Araf 3 -linked structure. The latter is then cleaved by GH121 β-larabino… Show more
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