Characterization of a salt-resistant isocitrate lyase gene from mangrove wetland using shotgun metagenomic sequencing
文献类型: 外文期刊
作者: Bo Xu;Wenfei Zhang;Dongming Li;Yinghong Jin;Xianzi Rong;徐玉泉;Ruiping Wang
作者机构:
关键词: activity;enzymes;genes;genomics;identification
期刊名称: Letters in applied microbiology
ISSN: 1472-765X
年卷期: 2023 年 76 卷 4 期
页码:
收录情况: SCIE(2023版)
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 × 102 U/mg occurring at pH 7.5 and 37°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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