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短小芽孢杆菌木聚糖酶基因在毕赤酵母中的分泌表达及酶学性质研究 被引量:12

Secreted Expression of Bacillus pumilus Xylanase Gene in Pichia pastoris and Study on Enzymatic Properties
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摘要 将短小芽孢杆菌HB0 30的内切 1,4 木聚糖酶基因克隆到毕赤酵母表达载体pPIC9k上 ,得到重组质粒pH BM2 2 0 ,将pHBM2 2 0经酶切后分别转化三株毕赤酵母KM71、GS115、SMD116 8,该木聚糖酶基因在三株毕赤酵母中均实现了分泌表达。将重组毕赤酵母KM71(pHBM2 2 0 )、GS115 (pHBM2 2 0 )、SMD116 8(pHBM2 2 0 )分别诱导产酶 ,对重组酶进行相关的酶学性质分析表明 ,三者的最适反应pH值约为 5 5 ,最适反应温度约为 6 0℃。在其最适反应条件下测得三者粗酶液酶活分别为 10 80IU mL ,11 6 3IU mL ,9 6 8IU mL。重组毕赤酵母KM71(pHBM2 2 0 )所产酶的热稳定性较好 ,而在pH稳定性方面三者没有太大的差异。 The endo 1,4 xylanase gene from Bacillus pumilus HB030 was cloned into the Pichia pastoris expression vector,pPIC9k, the recombinant plasmid was named pHBM220. The digested recombinant plasmid pHBM220 was transformed into Pichia pastoris KM71、GS115、SMD1168, respectively. The recombinant Pichia pastoris KM71(pHBM220)、GS115(pHBM220)、SMD1168 (pHBM220) secreted functional endo 1,4 xylanase, and the enzymatic activities reached 10 80IU/mL、11 63IU/mL、9 68IU/mL, respectively. The temperature and pH optimum for the recombinant xylanase were 60℃and pH5 5,respectively.
出处 《生物工程学报》 CAS CSCD 北大核心 2003年第1期50-55,共6页 Chinese Journal of Biotechnology
基金 国家自然科学基金 (No.3 990 0 0 0 3 ) 湖北省科技厅重点攻关项目 (No .992P0 3 2 0 ) 武汉市科技局科技攻关项目 (No .992 0 0 2 0 5 4G)资助~~
关键词 短小芽孢杆菌 木聚糖酶基因 分泌表达 酶学性质 毕赤酵母 Endo 1,4 xylanase gene, Pichia pastoris , expression, enzymatic properties
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