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Physiological Responses of Ribosomal Protein S12 K43 Mutants of Corynebacterium glutamicum

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Abstract

Bacterial resistance to streptomycin is often acquired as a consequence of mutations in rpsL, the gene encoding ribosomal protein S12. Corynebacterium glutamicum is a non-pathogenic Gram-positive soil bacterium that has been widely used in industry. In a previous study, we screened several streptomycin-resistant rpsL K43 mutants of C. glutamicum, and surprisingly found that two of them also confer chloramphenicol and/or kanamycin resistance. In order to understand whether or not a single mutation of rpsLK43 could confer resistance to multiple antibiotics, in this study we attempted to construct saturation mutagenesis of rpsL K43 by rational genetic manipulation. Despite many efforts had been made, only nine mutants were successfully constructed. They were indeed resistant to streptomycin, but not to other antibiotics. This suggested that other mutations should be acquired, contributing to multiple antibiotics in the screened strains. The growth and enhanced green fluorescent protein (eGFP) expression of these nine mutants were then investigated. The results showed that they grew differently in CGXII minimal medium, but not in BHI medium. When cultured in the absence of streptomycin, the expression of eGFP was positively proportional to the growth, approximately, while in the presence of streptomycin, the expression of eGFP was proportional to the ability of streptomycin resistance.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (2021YFC2100900).

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Authors and Affiliations

  1. College of Biotechnology, Tianjin University of Science & Technology, Tianjin, 300457, China

    Guihong Zhao, Rui Su, Meng Yuan, Hongkun Ma, Taidong Bo, Hao Jiang, Chen Wu & Yanjun Li

  2. Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science & Technology, Tianjin, 300457, China

    Yanjun Li

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  1. Guihong Zhao
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Contributions

GHZ, RS, MY, HKM, TDB performed the study; HJ and CW analyzed the data and drafted the manuscript; YJL initiated the work, revised, and edited the manuscript. All authors approved the final version and endorsed the guidance.

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Correspondence to Yanjun Li.

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Zhao, G., Su, R., Yuan, M. et al. Physiological Responses of Ribosomal Protein S12 K43 Mutants of Corynebacterium glutamicum. Curr Microbiol 79, 94 (2022). https://doi.org/10.1007/s00284-022-02795-8

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