生物技术通报 ›› 2016, Vol. 32 ›› Issue (2): 116-122.doi: 10.13560/j.cnki.biotech.bull.1985.2016.02.015

• 研究报告 • 上一篇    下一篇

黑曲霉C112纤维二糖酶基因的克隆与生物信息学分析

朱永瑞, 曾柏全, 曾磊, 刘辉   

  1. 中南林业科技大学 生命科学与技术学院,长沙 410004
  • 收稿日期:2015-04-30 出版日期:2016-02-24 发布日期:2016-02-25
  • 作者简介:朱永瑞,男,硕士研究生,研究方向:微生物方面的基因克隆与表达研究;E-mail:1006398396@qq.com
  • 基金资助:
    湖南省教育厅科学研究重点项目(13A123),中南林业科技大学研究生科技创新基金项目(CX2014B30)

Cloning and Bioinformatics Analysis of Cellobiase Gene from Aspergillus niger C112

ZHU Yong-rui, ZENG Bai-quan,ZENG Lei, LIU Hui   

  1. (College of Life Science and Technology,Central South University of Forestry and Technology,Changsha 410004)
  • Received:2015-04-30 Published:2016-02-24 Online:2016-02-25

摘要: 以紫外诱变获得的高产纤维素酶黑曲霉C112菌株为模板,采用RT-PCR技术克隆黑曲霉C112的纤维二糖酶基因bgl(GenBank登录号:KP307454);该基因全长2 934 bp,含有非编码序列,编码860个氨基酸,等电点为4.70,核酸序列与数据库的Aspergillus niger(GenBank登录号JX982101.1)同源性达到了99%;生物信息学分析表明,纤维二糖酶为具有一定亲水性的稳定酸性分泌蛋白;二级结构以α-螺旋、β-折叠和无规则卷曲为结构元件;该基因经IPTG 诱导重组蛋白表达,SDS-PAGE 检测结果表明,重组表达产物的相对分子量约为93.3 kD,与预期相符;纤维二糖酶在大肠杆菌BL21中胞内融合表达,重组蛋白pNPG酶活为5.847 U/mL,最适反应温度为50℃,最适pH值为5.0。

关键词: 黑曲霉C112, 纤维二糖酶, 克隆, 生物信息学

Abstract: The cellobiase gene(GenBank accession number:KP307454)was cloned by RT-PCR from high-yield cellulase Aspergillus nigerstrain C112 mutated by UV.The whole length of cellobiase was 2 934 bp containing non-coding sequence, and encoding 860 amino acids with the pI of 4.70.The homology of nucleotide sequence with Aspergillus niger(GenBank accession number:JX982101.1)reached 99%.Bioinformatics analysis showed that cellobiase was a hydrophilic, stable, and secreted protein;its secondary structure consisted of the structural elements of α-helix, β-folding and random coil.As expected, recombinant fusion protein was expressed after IPTG induction, and the relative molecular mass was approximately 93.3 kD by SDS-PAGE.The fused β-Glucosidase was expressed in Escherichia coli BL21.The enzyme activity of recombinant protein pNPGwas 5.847 U/mL, the optimal reaction temperature was 50℃, and the optimal reaction pH was 5.0.

Key words: Aspergillus niger C112, cellobiase, cloning, bioinformatics