Abstract
Exopolysaccharides (EPS) from lactic acid bacteria contribute to specific rheology and texture of fermented milk products and find applications also in non-dairy foods and in therapeutics. Recently, four clusters of genes (cps) associated with surface polysaccharide production have been identified in Lactobacillus plantarum WCFS1, a probiotic and food-associated lactobacillus. These clusters are involved in cell surface architecture and probably in release and/or exposure of immunomodulating bacterial molecules. Here we show a transcriptional analysis of these clusters. Indeed, RT-PCR experiments revealed that the cps loci are organized in five operons. Moreover, by reverse transcription–qPCR analysis performed on L. plantarum WCFS1 (wild type) and WCFS1-2 (ΔccpA), we demonstrated that expression of three cps clusters is under the control of the global regulator CcpA. These results, together with the identification of putative CcpA target sequences (catabolite responsive element CRE) in the regulatory region of four out of five transcriptional units, strongly suggest for the first time a role of the master regulator CcpA in EPS gene transcription among lactobacilli.
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Acknowledgments
We gratefully acknowledge the financial support of POR Campania, Misura 2014 (2010–2015) AGRIGENET—Network per la salvaguardia e la gestione delle risorse genetiche agroalimentari campane.
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Communicated by Pierre Béguin.
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Vastano, V., Perrone, F., Marasco, R. et al. Transcriptional analysis of exopolysaccharides biosynthesis gene clusters in Lactobacillus plantarum . Arch Microbiol 198, 295–300 (2016). https://doi.org/10.1007/s00203-015-1169-1
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DOI: https://doi.org/10.1007/s00203-015-1169-1