米曲霉酸性蛋白酶Ap的结构分析
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

Q816;Q71

基金项目:


Structural Analysis of Acid Protease ( Ap) from Aspergillus oryzae
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:

    米曲霉(Aspergillus oryzae)酸性蛋白酶与部分商品化的蛋白酶相比,具有对大豆蛋白水解效率高且水解产物苦味弱的特性。作者采用RT-PCR技术克隆获得酸性蛋白酶(Ap)基因,结合生物信息学手段,对Ap进行分析与预测。结果表明:Ap基因对密码子使用频率具有偏好性,特别是第3位密码子对GC碱基的使用频率高,达到74%;编码404个氨基酸残基。Ap属于胞外天冬氨酸蛋白酶。以海枣曲霉(A. phoenicis)的酸性蛋白酶(PDB code:1IBQ)作为模板同源建模结果可知,Ap分子至少能与2个Zn2+结合,内含1个二硫键、163个氢键、35个盐碱。该酶与1IBQ相比空间结构总体相似,部分重要位点(如flap环、转角和ψ-loops)的氨基酸残基较为保守。

    Abstract:

    Compared with some commercial proteases,acid protease(Ap) from Aspergillus oryzae has high hydrolysis efficiency and produces soy hydrosates with weaker bitterness. In order to uncover the structural characteristics,Ap gene from A. oryzae was cloned by RT-PCR technology,and then was analyzed with bioinformatics technology. Results showed that Ap gene had a preference for codon usage,especially for the third codon with the 74% usage frequency of GC base,and encoded 404 amino acid residues. Ap was an extracellular aspartic proteinase. According to the structure obtained by homology modeling with acid protease from A. phoenicis(PDB code:1IBQ),Ap was found to possess at least two Zn2+ binding sites,one disulfide bond,163 hydrogen bonds,35 salt bonds,and two solvent accessible surfaces of D33(4.7849?魡2) and D215(3.5941?魡2). Though the spatial structures of Ap and 1IBQ were similar,residues of some important sites(such as flap ring,angle and ψ-loops) were conservative.

    参考文献
    相似文献
    引证文献
引用本文

柯野,李嘉盛,曾松荣,朱兆静.米曲霉酸性蛋白酶Ap的结构分析[J].食品与生物技术学报,2016,35(1):95-100.

KE Ye, LI Jiasheng, ZENG Songrong, ZHU Zhaojing. Structural Analysis of Acid Protease ( Ap) from Aspergillus oryzae[J]. Journal of Food Science and Biotechnology,2016,35(1):95-100.

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: 2016-03-11
  • 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