Establishment of a markerless gene deletion system in Chromohalobacter salexigens DSM 3043@

文献类型： 外文期刊

第一作者： Shao, Ya-Hui

作者： Shao, Ya-Hui;Guo, Li-Zhong;Yu, Hao;Lu, Wei-Dong;Zhao, Bai-Suo

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关键词： Chromohalobacter salexigens;Allelic exchange;Homologous recombination;Markerless deletion;sacB

期刊名称：EXTREMOPHILES （ 影响因子：2.395； 五年影响因子：2.668 ）

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收录情况： SCI

摘要： Chromohalobacter salexigens DSM 3043 can grow over a wide range of salinity, which makes it as an excellent model organism for understanding the mechanism of prokaryotic osmoregulation. Functional analysis of C. salexigens genes is an essential way to reveal their roles in cellular osmoregulation. However, the lack of an effective markerless gene deletion system has prevented construction of multiple gene deletion mutants for the members in the genus. Here, we report the development of a markerless gene deletion system in C. salexigens using allelic exchange method. In this system, the in vitro mutant allele of target gene was inserted into a pK18mobsacB-based integrative vector pMDC21, which contained a chloramphenicol resistance cassette as the positive selection marker and a sacB gene from Bacillus subtilis as the counterselectable marker. To validate this system, two single-gene deletion mutants and a double-gene deletion mutant were constructed. In addition, our results showed that growth of the merodiploids and sucrose screening at 25 degrees C were more effective to decrease the occurrence of spontaneous sucrose resistance colonies than at higher temperature (30 or 37 degrees C), and growth of the merodiploids in mineral salt medium instead of the complex medium was critical to increase the recovery rate of deletion mutants.

分类号： Q93

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