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The applied side of antimicrobial peptide-inducible promoters from Firmicutes bacteria: expression systems and whole-cell biosensors

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Abstract

The cell envelope is an essential bacterial structure that consists of the cytoplasmic membrane, the cell wall, and—in Gram-negative bacteria—the outer membrane. Because of its crucial functions, it represents a prime antibiotic target. Monitoring and maintaining its integrity are therefore keys to survival, especially in competitive environments where antibiotics represent one means of suppressing the growth of competitors. Resistance against external antibiotic threat, as well as auto-immunity against self-produced antibiotics, is often mediated by two-component systems (2CSs). They respond to antibiotic threat by inducing gene expression that results in the production of specific resistance determinants. The underlying transcriptional control is exhibited at the level of specific target promoters, which usually share a number of relevant features: They are tightly controlled and only induced in the presence of specific (sets of) antibiotics. This induction is dose dependent and often very sensitive, that is, it occurs well below inhibitory antibiotic concentrations. Because of these characteristics, a number of well-characterized cell envelope stress-inducible promoters have been developed for two different applied purposes: first, as whole-cell biosensors for antibiotic detection and mechanism-of-action studies, and second, as antibiotic-inducible expression systems for biotechnological purposes. The current state of research in both fields will be discussed in this review, focusing on 2CS-regulated promoters from Firmicutes bacteria that are induced to mediate resistance against antimicrobial peptides (AMPs) targeting the cell envelope.

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Acknowledgments

The authors would like to thank Carolin Kobras, Susanne Gebhard, and Anna Staron for providing pictures for Fig. 2. Work in the authors’ laboratory on AMP-responsive 2CSs and their target promoters was financially supported by the Deutsche Forschungsgemeinschaft (to TM).

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  1. Institute of Microbiology, Technische Universität (TU) Dresden, 01062, Dresden, Germany

    Diana Wolf & Thorsten Mascher

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Correspondence to Thorsten Mascher.

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Work in the authors’ laboratory on AMP-responsive 2CSs and their target promoters was financially supported by the Deutsche Forschungsgemeinschaft (to TM).

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The authors declare that they have no conflict of interest.

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Wolf, D., Mascher, T. The applied side of antimicrobial peptide-inducible promoters from Firmicutes bacteria: expression systems and whole-cell biosensors. Appl Microbiol Biotechnol 100, 4817–4829 (2016). https://doi.org/10.1007/s00253-016-7519-3

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