Function
Involved in the degradation of arabinan and is a key enzyme in the complete degradation of the plant cell wall. Catalyzes the cleavage of terminal alpha-L-arabinofuranosyl residues in different hemicellulosic homopolysaccharides (branched and debranched arabinans) and heteropolysaccharides (arabinoxylans). It is able to hydrolyze the alpha-(1->5)-glycosidic linkages of linear alpha-(1->5)-L-arabinan (debranched), sugar beet arabinan (branched) and wheat arabinoxylan. Moreover, it displays higher activity towards branched arabinan, a molecule comprising a backbone of alpha-(1->5)-linked L-arabinofuranosyl residues decorated with alpha-(1->2)-, and alpha-(1->3)-linked L-arabinofuranosyl units, than towards debranched arabinan. In addition, arabinoxylan, which has L-arabinofuranose residues attached to the main chain by alpha-(1->2)-and/or alpha-(1->3)-glycosidic linkages, is preferred to linear alpha-(1->5)-L-arabinan.
Sequence
MSEHQAVIQTDIAKGTINKNIYGHFAEHLGRGIYEGIWVGTDSDIPNINGIRKDVLEALKQLHIPVLRWPGGCFADEYHWANGVGDRKTMLNTHWGGTIESNEFGTHEFMMLCELLECEPYICGNVGSGTVQEMSEWIEYMTFEEGTPMSDWRKQNGREEPWKLKYFGVGNENWGCGGNMHPEYYADLYRRFQTYVRNYSGNDIYKIAGGANVDDFNWTDVLMKKAAGLMDGLSLHYYTIPGDFWKGKGSATEFTEDEWFITMKKAKYIDELIQKHGTIMDRYDPEQRVGLIIDEWGTWFDPEPGTNPGFLYQQNTIRDALVAASHFHIFHQHCRRVQMANIAQTVNVLQAMILTEGERMLLTPTYHVFNMFKVHQDASLLATETMSADYEWNGETLPQISISASKQAEGDINITICNIDHQNKAEAEIELRGLHKAADHSGVILTAEKMNAHNTFDDPHHVKPESFRQYTLSKNKLKVKLPPMSVVLLTLRADS