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将来源于嗜热厌氧乙醇菌(Thermoanaerobacter ethanolicus,JW200)的双活性阿拉伯/木糖苷酶(XarB)构建到pET-20b(+)上,得到质粒pET-20b-xarB.将来源于疏棉状嗜热丝孢菌(The rm omyces lanuginosus DSM 5826)木聚糖酶A(XynA)构建到pET-20b-xarB上,得到表达质粒pET-20b-xarB-xynA.将重组质粒pET-20b-xarB-xynA转入大肠杆菌Escherichia coli JM109(DE3)进