... Arabinotriose in the binding cleft is representedusing sticks. (B) Detailed view of the binding cleft with arabinotri-ose. (C) Details of the residues defining the binding cleft. Hydrogenbond interactions ... polysaccharides, including arabinan, ara-binoxylan and arabinogalactan [6,7]. ABNs attack theglycosidic bonds of the a-1,5-l-arabinan backbone,releasing a mixture of arabinooligosaccharides and l-arabinose ... a-1,5-linked l-arabinofuranosyl units,some of which are substituted with a-1,3- and a-1,2-linked chains of l-arabinofuranosyl residues [4,5]. Two major enzymes hydrolyse arabinan: a-l-arabinofurano-sidases...