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초록· 키워드

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Three types of xylanases (EC 3.2.1.8) were detectedin the strain Aspergillus niger A-25, one of which, designatedas XynIII, also displayed βactivity, as determined by a zymogram analysis. XynIII waspurified by ultrafiltration and ion-exchange chromatographymethods. Its apparent molecular weight was about 27.9 kDa,as estimated by SDS-PAGE. The purified XynIII could hydrolyzebirchwood xylan, oat spelt xylan, lichenin, and barley β-glucan, but not CMC, avicel cellulose, or soluble starch underthe asay conditions in this study. The xylanase and β-(1,3-1,4)-glucanase activities of XynIII both had a similar optimaland temperature stability. Moreover, the effects of metal ionson the two enzymatic activities were also similar. The overallhydrolytic rates of XynIII in diferent mixtures of xylan andlichenin coincided with those calculated using the Michaelis-Menten model when assuming the two substrates werecompeting for the same active site in the enzyme. Accordingly,the results indicated that XynIII is a novel bifunctional enzymeand its xylanase and β-(1,3-1,4)-glucanase activities arecatalyzed by the same active center.

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