生物技术通报 ›› 2013, Vol. 0 ›› Issue (4): 129-135.

• 研究报告 • 上一篇    下一篇

毕赤酵母新启动子GCW14 在细胞表面展示CALB 中的应用

张轩薇 叶燕锐 刘晓肖 鲁柳柳 林影   

  1. 华南理工大学生物科学与工程学院,广州 510006
  • 收稿日期:2012-10-17 修回日期:2013-04-22 出版日期:2013-04-22 发布日期:2013-04-22
  • 作者简介:张轩薇,女,硕士研究生,研究方向:发酵工程;E-mail :zhangxuanwei88@yahoo.cn
  • 基金资助:
    国家自然科学基金项目(20976062,31170031), 广东省自然科学基金项目(S2011020001457)

Application of Pichia pastoris Original Constitutive Strong Promoter GCW14 in Candidn antarctic Lipase B Yeast Surface Display

Zhang Xuanwei, Ye Yanrui, Liu Xiaoxiao, Lu Liuliu, Lin Ying   

  1. College of Biology Science and Technology,South China University of Technology,Guangzhou 510006
  • Received:2012-10-17 Revised:2013-04-22 Published:2013-04-22 Online:2013-04-22

摘要: 以毕赤酵母内源壁蛋白Gcw14p 为锚定蛋白,分别以新的内源组成型启动子PGCW14 与诱导型启动子PAOX1、组成型启 动子PGAP 和PTEF14 种启动子将南极假丝酵母脂肪酶B(CALB)展示于毕赤酵母细胞表面,通过检测4 种重组细胞的CALB 酶活比 较这4 个启动子在毕赤酵母中的转录活性。结果显示,PGCW14 的启动子活性与PAOX1 相当,最高菌体酶活力分别在发酵48 h 和168 h 时达到694.8 U/g(Dry cell weight)和684.3 U/g(Dry cell weight),以PGCW14 为启动子的重组菌产酶周期大大缩短;组成型启动子 PGAP 和PTEF1 的最高菌体酶活分别在发酵24 h 和168 h 达到266.7 U/g(Dry cell weight)和449.2 U/g(Dry cell weight),可见PGCW14 的 启动子活力性要高于PGAP 和PTEF1。此外,以PGCW14 为启动子,利用壁蛋白Gcw14p 自身的信号肽代替载体上的α-信号肽使重组菌的菌体酶活力提高了约4%。

关键词: 巴斯德毕赤酵母, 启动子, 南极假丝酵母脂肪酶B, 酵母表面展示

Abstract: To compare the transcription activity of original promoter PGCW14 with other promoters, Candidn antarctic lipase B(CALB) was displayed on the cell surface of Pichia pastoris using PGCW14, PAOX1, PGAP and PTEF1 as promoter respectively. Anchor protein was a cell wall protein named Gcw14p, which was obtained originally from P. pastoris. In shake-flask cultivation, the activity of PGCW14 was equal to that of PAOX1.Under control of PGCW14 and PAOX1, the highest lipase hydrolytic activities of recombinant yeasts reached 694.8 U/g(Dry cell weight)and 684.3 U/g(Dry cell weight)after cultivation for 48 h and 120 h, respectively. The fermentation period of recombinant yeast using PGCW14 as promoter was shortened significantly. While the highest lipase hydrolytic activities of recombinant yeasts controlled by constitutive promoter PGAP and PTEF1 reached 266.7 U/g(Dry cell weight)and 449.2 U/g(Dry cell weight)respectively after cultivation for 48 h. This means that the activity of PGCW14 was higher than that of PGAP and PTEF1. Furthermore, replacing the α-factor with signal peptide from protein Gcw14p, the lipase hydrolytic activity increased about 4%.

Key words: Pichia pastoris, Promoter, Candidn antarctic lipase B, Yeast cell-surface display