Journal
JOURNAL OF APPLIED MICROBIOLOGY
Volume 111, Issue 6, Pages 1473-1481Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2672.2011.05160.x
Keywords
ClpP; HtrA; inhibition of growth; Lactobacillus casei; phenolic compound; purine metabolism
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Funding
- Spanish Ministry of Science and Innovation (MICINN) [AGL2010-15679, CSD2007-00063]
- FEDER
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Aims: To determine the inhibitory effect of phenolic compounds on Lactobacillus casei BL23, the role of two component signal transduction systems (TCS) and the response of Lact. casei BL23 to p-coumaric acid. Methods and Results: Growth of Lact. casei BL23 and 17 derivative strains defective in each TCS harboured by this strain in the presence of p-coumaric acid, ferulic acid, caffeic acid or methyl gallate was monitored. Furthermore, changes in the protein content of Lact. casei BL23 when exposed to p-coumaric acid were evaluated by 2D-SDS-PAGE. Eleven proteins differentially expressed in the presence of p-coumaric acid were detected. Six of them could be identified: ClpP and HtrA, involved in protein turnover and folding, acetyl-CoA carboxylase, involved in lipid metabolism, and an arginyl-tRNA synthetase were more abundant, whereas PurL and PurN, involved in purine biosynthesis, were less abundant. Conclusions: No significant differences were observed between the parental strain and the TCS-defective mutants. p-Coumaric acid elicited a response against membrane and cytoplasmic damages. Significance and Impact of the Study: The inhibitory effect of phenolic compounds on Lact. casei BL23 has been determined. For the first time, cytoplasmic proteins presumably involved in the response of Lact. casei BL23 against p-coumaric acid have been identified.
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