Abstract
Genes involved in the transport and catabolism of carbohydrates are usually controlled through the binding of the catabolite control protein A (CcpA) to the catabolite-responsive elements (cre) of target genes in Gram-positive bacteria. In this work, we show how the elimination of the cre sites in Lactobacillus casei BL23 promoters induced by sorbitol (PgutF), maltose (PmalL), and myo-inositol (PiolT) allowed the induction of gene expression in media supplemented with sorbitol, maltose, and myo-inositol, respectively, even in the presence of glucose. This was studied using plasmids encoding the anaerobic fluorescent protein evoglow-Pp1 as a reporter. In addition, gutF cre site was introduced into a bile inducible promoter (P16090) and into the constitutive promoter of the elongation factor P (PEf-P) of L. casei BL23. The existence of the cre site blocked gene expression in the P16090 inducible promoter in the presence of glucose, while it had no influence on the expression of the PEf-P constitutive one. These results demonstrated that the introduction or elimination of cre sites in inducible promoters allows the control and modification of their heterologous genetic expression, showing how the cre site, the transcriptional regulator, and CcpA interact to control gene expression in inducible genes.
Key points
• Cre sequences regulate gene expression in inducible promoters in L. casei BL23.
• Cre sites do not affect gene expression in constitutive promoters in L. casei BL23.
• Cre sequences could control heterologous genic expression in lactobacilli.
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This work was supported by RTA2017-00002-00-00 project from the Ministry of Economy and Competitiveness (Spain).
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JML conceived and designed research and conducted experiments. JML and SL analyzed the data. JML, SL, AP, and JLA interpreted the data and wrote the manuscript. All authors read and approved the submitted manuscript.
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Langa, S., Peirotén, Á., Arqués, J.L. et al. Catabolite responsive elements as a strategy for the control of heterologous gene expression in lactobacilli. Appl Microbiol Biotechnol 105, 225–233 (2021). https://doi.org/10.1007/s00253-020-11010-2
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DOI: https://doi.org/10.1007/s00253-020-11010-2