Journal
EXTREMOPHILES
Volume 10, Issue 4, Pages 295-300Publisher
SPRINGER TOKYO
DOI: 10.1007/s00792-005-0499-3
Keywords
xylanase; cold active; thermolabile
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There is a great interest in xylanases due to the wide variety of industrial applications for these enzymes. We cloned a xylanase gene (xyn8) from an environmental genomic DNA library. The encoded enzyme was predicted to be 399 amino acids with a molecular weight of 45.9 kD. The enzyme was categorized as a glycosyl hydrolase family 8 member based on sequence analysis of the putative catalytic domain. The purified enzyme was thermolabile, had an activity temperature optimum of 20 degrees C on native xylan substrate, and retained significant activity at lower temperatures. At 4 degrees C, the apparent K-m was 3.7 mg/ml, and the apparent k(cat) was 123/s.
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