title: Recombinant expression and characterization of XynD from Bacillus subtilis subsp. subtilis ATCC 6051: a GH 43 arabinoxylan arabinofuranohydrolase.
abstract: The complete genome sequence of Bacillus subtilis reveals that sequences encoding several hemicellulases are co-localised with a gene (xynD) encoding a putative family 43 glycoside hydrolase that has not yet been characterised. In this work, xynD has been isolated from genomic DNA of B. subtilis subsp. subtilis ATCC 6051 and cloned for cytoplasmatic expression in Escherichia coli. Recombinant XynD (rXynD) was purified using ion-exchange chromatography and gel permeation chromatography. The enzyme had a molecular mass of approximately 52 kDa, a pI above 9.0 and releases alpha-L-arabinose from arabinoxylo-oligosaccharides as well as arabinoxylan polymers with varying degree of substitution. Using para-nitrophenyl-alpha-L-arabinofuranoside as substrate, maximum activity was observed at pH 5.6 and 45 degrees C. The enzyme retained its activity over a large pH range, while activity was lost after pre-incubation above 50 degrees C. Gas-liquid chromatography and proton nuclear magnetic resonance spectrometry analysis indicated that rXynD specifically releases arabinofuranosyl groups from mono-substituted C-(O)-2 and C-(O)-3 xylopyranosyl residues on the xylan backbone. As rXynD did not display endoxylanase, xylosidase or arabinanase activity and was inactive on arabinan, we conclude that this enzyme is best described as an arabinoxylan arabinofuranohydrolase.
authors.affiliation: Laboratory of Gene Technology, Katholieke Universiteit Leuven, Kasteelpark Arenberg 21, 3001 Leuven, Belgium. tine.bourgois@biw.kuleuven.be
authors.forename: Tine M
authors.initials: TM
authors.lastname: Bourgois
authors.forename: Valerie
authors.initials: V
authors.lastname: Van Craeyveld
authors.forename: Steven
authors.initials: S
authors.lastname: Van Campenhout
authors.forename: Christophe M
authors.initials: CM
authors.lastname: Courtin
authors.forename: Jan A
authors.initials: JA
authors.lastname: Delcour
authors.forename: Johan
authors.initials: J
authors.lastname: Robben
authors.forename: Guido
authors.initials: G
authors.lastname: Volckaert
mesh_terms: D001089:Arabinose / Q000378:metabolism*; D001412:Bacillus subtilis / Q000201:enzymology / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D006026:Glycoside Hydrolases / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics*; D014990:Xylans / Q000378:metabolism*
chemical_list: D014990:Xylans; D001089:Arabinose; D006026:Glycoside Hydrolases