Bacillus agaradhaerens 균주의 효소를 정제하여 그 특성을 확인하였다. 균주가 생산하는 xylanase를 70% ammonium sulfate로 침전하고 CM-sepharose ion exchange chromato- graphy와 ultrafiltration(PM-10)을 행하여 16.7%의 수율과 6.7배의 정제도를 지니는 효소를 얻을 수 있었으며 SDSPAGE를 통하여 23 kDa의 분자량을 갖는 효소임을 확인하였다. 효소의 최적 pH는 6.0으로서 sodium phosphate buffer에서 24시간까지 안정하였으며, 최적반응온도는 60oC, EDTA의 첨가 시 효소활성이 증가되었고 40oC에서 24시간까지 안정하였다. 효소는 xylan만을 기질로 이용할 수 있었으며 Birchwood xylan에 대하여 최대 활성을 나타내었고 Vmax는 49,724 μM/min, Km은 6.08 mg/ml로 확인되었다.

The optimum conditions for the production of xylanase from Bacillus agaradhaerens DK-2386 have been previously investigated. In this study xylanase was purified by ammonium sulfate precipitation and CM-sepharose ion exchange chromatography. The molecular mass of the xylanase as determined by SDS-PAGE was 23 kDa in a form of monomeric enzyme. The optimum pH and temperature for xylanase activity was 6.0 and 60oC, respectively. Xylanase activity was increased by the addition of EDTA and then stabilized at 40oC for 24 h. The maximum xylanase activity was obtained when Birchwood xylan was used as a substrate and the Vmax and Km were 49,724 μmol/min and 6.08 mg/ml, respectively.