CNKI《中国期刊全文数据库》收录期刊
《中国核心期刊(遴选)数据库》收录期刊
《中文科技期刊数据库》收录期刊

Enzymatic synthesis of L-alanyl-L-glutamine by L-amino acid ligase fromBacillus subtilis

Expand
  • 1.Key Laboratory of Industrial Fermentation Microbiology,Ministry of Education,Tianjin University of Science and  Technology,Tianjin 300457,China;
    2.College of Biotechnology,Tianjin University of Science and Technology,
    Tianjin 300457,China;
    3.Nutraceutical Research Division,Tasly Holding Group Co.,Ltd.,Tianjin 300040,China

Abstract

L-amino acid ligase(Lal)gene from Bacillus subtilis ATCC 15245was cloned and  expressed in Escherichia coli BL21(DE 3).The recombinant Lal was purified by Ni-NAT.Lalanyl-L-glutamine was synthesized by purified Lal using L-alanine and L-glutamine as the substrate.Lal is an ATP-dependent enzyme,the results showed that the optimal reaction  temperature and pH value of Lal was 37 ℃ and 9.0,respectively.30 mmol/L amino acids  substrate was converted into 22.4mmol/L L-alanyl-L-glutamine by 14hcontinuous catalytic  reaction,the maximum molar yield reached 74.7%.In this study,Lal from Bacillus subtilis  ATCC 15245was successfully expressed and applied to L-alanyl-L-glutamine production.The  results can lay theoretical foundation for the bio-manufacturing of L-alanyl-L-glutamine.

Cite this article

HONG Xiang,ZHU Xinya,JIA Zifan,HUANG Han,TAN Xu,FAN Xiaoguang . Enzymatic synthesis of L-alanyl-L-glutamine by L-amino acid ligase fromBacillus subtilis[J]. Bulletin of Fermentation Science and Technology, 2017 , 46(2) : 83 -87 . DOI: 10.16774/j.cnki.issn.1674-2214.2017.02.004

Outlines

/