融合β-甘露聚糖酶基因的构建、表达及酶学性质的分析
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

TS201.25

基金项目:


Expression and Enzymatic Properties Analysis of a Fusion β-Mannanase
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    宇佐美曲霉 (Aspergillus usamii) YL-01-78的糖苷水解酶5家族β-甘露聚糖酶 (AuMan5A) 是一种仅含催化域 (CM) 的单结构蛋白。为改善其酶学性质,基于理性设计将海栖热胞菌 (Thermotoga maritima) MSB8的27家族碳水化合物结合域 (CBM27)融合至AuMan5A的C-端,并采用重叠PCR技术构建融合酶基因Auman5A-cbm27。分别将Auman5A-cbm27和Auman5A在毕赤酵母GS115中进行表达,对重组表达产物reAuMan5A-CBM27和reAuMan5A进行纯化和酶学性质测定。结果表明,reAuMan5A-CBM27和reAuMan5A的最适温度均为68 ℃;两者分别在68和60 ℃及以下稳定。同时,前者较后者具有更广泛的pH稳定范围。reAuMan5A-CBM27对角豆胶的Km值由融合前的1.7 mg/mL降至0.7 mg/mL,表明AuMan5A的底物亲和力得到了提高。

    Abstract:

    AuMan5A,which belongs to the glycoside hydrolase family 5 β-mannanase from Aspergillus usamii YL-01-78,only contains a catalytic module (CM). To improve its enzymatic properties,a fusion β-mannanase (AuMan5A-CBM27) was well designed by fusing a family 27carbohydrate-binding module (CBM27) from Thermotoga maritima MSB8 into the C-terminus of AuMan5A. A fusion gene (Auman5A-cbm27) constructed by the overlapping PCR was expressed in Pichia pastoris GS115. The enzymatic properties of the purified reAuMan5A-CBM27 and reAuMan5A were investigated. The optimal temperatures of both reAuMan5A-CBM27 and reAuMan5A were determined at 68 ℃. They were respectively thermo-stabled at 68 ℃ or 60 ℃ and below. A wider pH tolerant range was observed for reAuMan5A-CBM27,whose Km value to locust bean dropped from 1.7 mg/mL to 0.7 mg/mL. The increase of substrate affinity of AuMan5A was confirmed.

    参考文献
    相似文献
    引证文献
引用本文

王春娟,李剑芳,唐诗涵,董运海,邬敏辰.融合β-甘露聚糖酶基因的构建、表达及酶学性质的分析[J].食品与生物技术学报,2016,35(11):1135-1141.

WANG Chunjuan, LI Jianfang, TANG Shihan, DONG Yunhai, WU Minchen. Expression and Enzymatic Properties Analysis of a Fusion β-Mannanase[J]. Journal of Food Science and Biotechnology,2016,35(11):1135-1141.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2016-12-21
  • 出版日期:

版权所有:《食品与生物技术学报》编辑部

地址:江苏省无锡市蠡湖大道1800号  邮政编码:214122

电话:0510-85913526  电子邮件:xbbjb@jiangnan.edu.cn

技术支持:北京勤云科技发展有限公司

微信公众号二维码

手机版网站二维码