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林产化学与工业 ›› 2007, Vol. 27 ›› Issue (5): 83-88.

• 研究报告 • 上一篇    下一篇

里氏木霉木聚糖酶XYNⅡ基因在毕赤酵母中的分泌表达

欧阳嘉1,2, 王向明2, 张清2, 严明2, 许琳2   

  1. 1. 南京林业大学 化学工程学院, 江苏 南京 210037;2. 南京工业大学 制药与生命科学学院, 江苏 南京 210009
  • 收稿日期:2006-11-25 修回日期:1900-01-01 出版日期:2007-10-30 发布日期:2007-10-30

Secretory Expression of Trichoderma reesei XYN Ⅱ Gene in Pichia pastoris

OUYANG Jia1,2, WANG Xiang-ming2, ZHANG Qing2, YAN Ming2, XU Lin2   

  1. 1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;2. College of Life Science and Pharmacy, Nanjing University of Technology, Nanjing 210009, China
  • Received:2006-11-25 Revised:1900-01-01 Online:2007-10-30 Published:2007-10-30

摘要: 采用RT-PCR方法克隆到里氏木霉Rut C-30木聚糖酶(XYN Ⅱ)的cDNA序列.测序结果表明,XYN Ⅱ的cDNA基因开放阅读框长度为669bp,编码223个氨基酸,N端1~19个氨基酸为潜在的信号肤序列,删去潜在信号肽序列,将里氏木霉木聚糖酶的基因(xyn Ⅱ)构建到巴斯德毕赤酵母分泌表达载体pPIC9K上,线性化后电击转化到巴斯德毕赤酵母中,经G418筛选和PCR鉴定后的转化子用1%的甲醇进行诱导,对重组木聚糖酶活检测显示该基因能在毕赤酵母中表达有生物活性的XYNⅡ并分泌到胞外.发酵液中的酶活在诱导培养0h达到1.45IU/mL,最适酶解温度为50℃,最适pH值为6.0.

关键词: 里氏木霉, 木聚糖酶, 毕赤酵母, 分泌表达

Abstract: The gene of xylanase(XYN II) was amplified by RT-PCR from the total RNA of Trichoderma reesei Rut C-30 and sequenced. The gene comprised an open reading frame that encoded a polypeptide of 223 amino acid residues, containing a signal peptide of 19 amino acid residues. A recombinant plasmid pPIC9K-xyn II was constructed by inserting gene xyn II into Pichia pastoris secretory vector pPIC9K. Linearized pPIC9K-xyn II was transformed into P.pastoris GS115 with the method of electroporation. The recombinant strain identified by G418 selection and confirmed by PCR analysis was induced by 1.0% methanol at 28℃ to express the recombinant xylanase, the highest enzyme activity of 1.45 IU/mL was detected for 60 h incubation. The optimal pH value and temperature of the enzyme activity is 6.0 and 50℃, respectively.

Key words: Trichoderma reesei, xylanase, Pachia pastoris, secretory expression

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