A neutral endoxylanase from a culture filtrate of Aspergillus nidulans grown on oat spelt xylan was purified to apparent homogeneity. The purified enzyme showed a single band on SDS-PAGE with a molecular mass of 22,000 and had an isoelectric point of 6.4. The enzyme was a non-debranching endoxylanase highly specific for xylans and completely free from cellulolytic activity. The xylanase showed an optimum activity at pH 5.5 and 62C and had a K m of 4.2 mg oat spelt xylan per ml and a Vma x of 710/~mol min-1 (mg protein)-1.
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Fernández-Espinar et al. (1993) studied this question.
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