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Appl. Environ. Microbiol., Apr 1995, 1666-1668, Vol 61, No. 4
Copyright © 1995, American Society for Microbiology

Xylanase IV, an Exoxylanase of Aeromonas caviae ME-1 Which Produces Xylotetraose as the Only Low-Molecular-Weight Oligosaccharide from Xylan

BK Kubata, K Takamizawa, K Kawai, T Suzuki and H Horitsu
The United Graduate School of Agricultural Science and Department of Biotechnology, Faculty of Agriculture, Gifu University, Gifu 501-11, Japan

A novel xylanase (xylanase IV) which produces xylotetraose as the only low-molecular-weight oligosaccharide from oat spelt xylan was isolated from the culture medium of Aeromonas caviae ME-1. By sodium dodecyl sulfate-polyacrylamide gel electrophoresis, the xylanase IV molecular weight was 41,000. Xylanase IV catalyzed the hydrolysis of oat spelt xylan, producing exclusively xylotetraose. The acid hydrolysate of the product gave d-xylose. The enzyme did not hydrolyze either p-nitrophenyl-(beta)-d-xyloside, small oligosaccharides (xylobiose and xylotetraose), or polysaccharides, such as starch, cellulose, carboxymethyl cellulose, laminarin, and (beta)-1,3-xylan.


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