Characterization of a salt-resistant isocitrate lyase gene from mangrove wetland using shotgun metagenomic sequencing

文献类型： 外文期刊

第一作者： Xu, Bo

作者： Xu, Bo;Zhang, Wenfei;Li, Dongming;Jin, Yinghong;Rong, Xianzi;Xu, Yuquan;Wang, Ruiping;Xu, Yuquan;Zhang, Wenfei;Wang, Ruiping

作者机构：

关键词： genomics; genes; identification; enzymes; activity

期刊名称：LETTERS IN APPLIED MICROBIOLOGY （ 影响因子：2.4； 五年影响因子：2.8 ）

ISSN： 0266-8254

年卷期： 2023 年 76 卷 4 期

页码：

收录情况： SCI

摘要： Isocitrate lyase (ICL), as the key enzyme in the glyoxylate metabolic pathway, plays an important role in metabolic adaptation to environmental changes. In this study, metagenomic DNA from the soil and water microorganism collected from the Dongzhai Harbor Mangroves (DHM) reserve, in Haikou City, China, was high-throughput sequenced using an Illumina HiSeq 4000 platform. The icl121 gene, encoding an ICL with the highly conserved catalytic pattern IENQVSDEKQCGHQD was identified. Then, this gene was subcloned into the pET-30a vector and overexpressed in Escherichia coli BL21 (DE3) cells. The maximum enzymatic activity of the recombinant ICL121 protein is 9.47 x 10(2) U/mg occurring at pH 7.5 and 37 degrees C. Furthermore, as a metalo-enzyme, ICL121 can utilize the appropriate concentrations of Mg2+, Mn2+, and Na+ ion as cofactors to exhibit high enzymatic activity. In particular, the novel metagenomic-derived icl121 gene displayed distinct salt tolerance (NaCl) and might be useful for generating salt-tolerant crops in the future.

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