Abstract

A xylanase gene from Paecilomyces thermophila was functionally expressed in Pichia pastoris. The recombinant xylanase (xynA) was predominantly extracellular; in a 5l fermentor culture, the total extracellular protein was 8.1gl(-1) with an activity of 52,940Uml(-1). The enzyme was purified to homogeneity with a recovery of 48%. The recombinant xynA was optimally active at 75°C, as measured over 10min, and at pH 7. The enzyme was stable up to 80°C for 30min. It hydrolyzed birchwood xylan, beechwood xylan and xylooligosaccharides to produce xylobiose and xylotriose as the main products.

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