Biotechnology Bulletin ›› 2015, Vol. 31 ›› Issue (2): 160-166.doi: 10.13560/j.cnki.biotech.bull.1985.2015.02.024

• Research Report • Previous Articles     Next Articles

Isolation, Expression and Identification of Multifunctional Glucoamylase from Marine Streptomyces olivaceus FXJ7.023

Wang Miao1, Li Yuanyuan1, Yue Changwu1, Shao Meiyun1 , Lü Yuhong1, Bao Yuxin1, Huang Ying2   

  1. 1. Guizhou Key Laboratory of Microbial Resources & Drug Development, Zunyi Medical College, Zunyi 563003;
    2. Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101
  • Received:2014-06-23 Online:2015-02-05 Published:2015-02-06

Abstract: SoGA, a predicted glucoamylase encoded by a full-length 1 788 bp gene consists of 595 amino acids was cloned from Streptomyces olivaceus strain FXJ7.023 genomic DNA by PCR. Heterologous expression of SoGA in Escherischia coli strains BL21(DE3) plysS was performed and a fusion protein with molecular weight of 83.22 kD was obtained. The novel recombinant glucoamylase showed multifunctional catalytic activity of hydrolyze carboxymethylcellulose and starch under different temperature and pH.

Key words: streptomycetes, glucoamylase, gene clone, protein expression, enzyme activity