Abstract
The polymorphism of 5 stress response genes (hrcA, ctsR, clpP, ftsH, dnaK) in 32 Lactobacillus plantarum strains was evaluated by multilocus restriction typing (MLRT) and by sequence analysis of ctsR, hrcA and clpP genes. Both these approaches allowed the discrimination of the subspecies L. plantarum ssp. plantarum and L. plantarum ssp. argentoratensis. HrcA sequence analysis also allowed discrimination at the species and subspecies level of several species of lactic acid bacteria, thus confirming that it can be used as a valuable taxonomic marker. No significant relationship was found between stress response gene polymorphism and resistance to heat treatments. The effect of temperature on growth kinetics and the protein expression were investigated for selected strains carrying different mutations in hrcA. L. plantarum ssp. argentoratensis NCIMB12120 and L. plantarum ssp. plantarum DPC2159, both of which had mutations in domains of HrcA which are important for the repressor functionality, had a reduced growth rate at all temperatures tested (25, 30, 37, 40, and 42 °C) compared to L. plantarum WCFS1. In L. plantarum DPC2159, protein expression upon temperature shifts from 25 to 40 °C or growth at 40 °C was altered compared to L. plantarum WCFS1, but further study is needed to unequivocally confirm the relationship with mutations in hrcA.
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Acknowledgments
This work was partly funded by Ministero dell’Istruzione, dell’Università e della Ricerca, Rome, Italy, PRIN n. 20088SZB9B, and by the Science Foundation of Ireland, Centre for Science, Engineering and Technology (SFI-CSET) grant 02/CE/B124. The Alimentary Pharmabiotic Centre is a research centre funded by Science Foundation Ireland (SFI).
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Guidone, A., Parente, E., Zotta, T. et al. Polymorphisms in stress response genes in Lactobacillus plantarum: implications for classification and heat stress response. Ann Microbiol 65, 297–305 (2015). https://doi.org/10.1007/s13213-014-0862-7
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DOI: https://doi.org/10.1007/s13213-014-0862-7