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Molecular cloning, characterization, and heterologous expression of a new kappa-carrageenase gene from marine bacterium Zobellia sp ZM-2

文献类型： 外文期刊

作者： Liu, Zhemin 1 ; Li, Guiyang 2 ; Mo, Zhaolan 2 ; Mou, Haijin 1 ;

作者机构： 1.Ocean Univ China, Coll Food Sci & Engn, Qingdao 266003, Peoples R China

2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

关键词： Gene cgkZ;Natural signal peptide;Heterologous expression;Posttranslational process;Enzyme properties

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

ISSN： 0175-7598

年卷期： 2013 年 97 卷 23 期

页码：

收录情况： SCI

摘要： kappa-Carrageenases exhibit apparent distinctions in gene sequence, molecular weight, enzyme properties, and posttranslational processes. In this study, a new kappa-carrageenase gene named cgkZ was cloned from the marine bacterium Zobellia sp. ZM-2. The gene comprised an open reading frame of 1,638 bp and encoded 545 amino acids. The natural signal peptide of kappa-carrageenase was used successfully for the secretory production of the recombinant enzyme in Escherichia coli. A posttranslational process that removes an amino acid sequence of about 20 kDa from the C-terminal end of kappa-carrageenase was first discovered in E. coli. An increase in enzyme activity by 167.3 % in the presence of 5 mM DTT was discovered, and Na+ at a certain concentration range was positively correlated with enzyme activity. The kappa-carrageenase production of E. coli was 9.0 times higher than that of ZM-2. These results indicate the potential use of the enzyme in the biotechnological industry.

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