生物技术通报 ›› 2015, Vol. 31 ›› Issue (12): 193-199.doi: 10.13560/j.cnki.biotech.bull.1985.2015.12.028

• 研究报告 • 上一篇    下一篇

共表达透明颤菌血红蛋白对毕赤酵母产Β-甘露聚糖酶发酵过程的影响

张晓龙1,肖静1,王瑞明1,汪俊卿1,王兴吉2,王正祥3   

  1. 1. 齐鲁工业大学生物工程学院 山东省微生物重点实验室,济南 250353;
    2. 山东隆利特酶制剂有限公司, 临沂 276000;
    3. 天津科技大学,天津 300222
  • 收稿日期:2015-04-23 出版日期:2015-12-19 发布日期:2015-12-19
  • 作者简介:张晓龙,男,硕士研究生,专业方向:微生物酶技术;E-mail:qingshuang0302@163.com
  • 基金资助:

    山东省轻工生物基产品清洁生产与炼制协同创新中心项目(03082001)

Effect of Co-expression of Vitreoscilla Hemoglobin on Expression of Β-mannanase in Pichia pastoris

Zhang Xiaolong1, Xiao Jing1, Wang Ruiming1, Wang Junqing1, Wang Xingji2, Wang Zhengxiang3   

  1. 1. Institute of Biological Engineering of Qilu University of Technology,Shandong Province Key Laboratory of Microbial Engineering,Jinan 250353
    2. Linyi Longkete Enzyme Preparation Co. Ltd,Linyi 276000
    3. Tianjin University of Science and Technology,Tianjin 300222
  • Received:2015-04-23 Published:2015-12-19 Online:2015-12-19

摘要:

为了改善高密度发酵生产Β-甘露聚糖酶过程中的溶氧限制,提高Β-甘露聚糖酶产量,将VHb和Β--甘露聚糖酶基因置于AOX1启动子调控之下,进行VHb和Β--甘露聚糖酶基因在毕赤酵母中的共表达。经密码子优化合成VHb基因,插入表达载体pPICZαA,整合到Β--甘露聚糖酶工程菌中,通过G418和Zeocin抗性筛选共表达VHb基因的重组酵母工程菌。在30 L发酵罐水平上分析共表达VHb菌株(VHb+)与初始菌株(VHb-)对Β--甘露聚糖酶表达的差异。结果显示,限氧条件下,VHb+菌株的Β--甘露聚糖酶的表达量比对照菌株VH b-高90%,且透明颤菌血红蛋白提高了甲醇耐受性,缩短发酵周期约40 h。

关键词: 透明颤菌血红蛋白, &#x00392, -甘露聚糖酶, 毕赤酵母, 高密度发酵表达

Abstract:

In order to improve the limitation of dissolved oxygen and increase Β-mannanase production in the process of high-density fermentation, the Β-mannanase gene and Vitreoscilla hemoglobin gene(VHb)were co-expressed in Pichia pastoris under the control of AOX1 promoter. The VHb gene was synthesized by codon optimization and inserted into expression vector pPICZαA, then integrated into the engineering bacterium of Β-mannanase gene, P. pastoris GS115/Ppic9K-Β-MAN. The recombinant P. pastoris of co-expressing VHb was selected by G418 and Zeocin resistance screening. Finally, the discrepancies in Β-mannanase expression between the co-expressed strain VHb+ and initial strain VHb- were analyzed in 30 L fermenter. The results showed as below, compared with the controlled strain, the expression of Β-mannanase by VHb+ strain was increased by 90% under oxygen-limited condition. Furthermore, Vitreoscilla hemoglobin was improved on the methanol tolerance, and fermentation period was shorted about 40 h, which could be an important industrial value.

Key words: Vitreoscilla hemoglobin, &#x00392, -mannanase, Pichia pastoris, high-density fermentation