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Bacillus subtilis endoxylanase XynA was engineered by site-directed mutagenesis to alter its substrate selectivity, i.e. the ratio of its capacity to solubilise water-unextractable arabinoxylans (WU-AX) to its capacity to hydrolyse water-extractable AX (WE-AX). Four surface exposed aromatic residues were targeted for mutation to alanine, either individually (Y113 and W185) or jointly (F48, Y94, Y113...
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