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Comparative proteomic analysis of Lactobacillus plantarum WCFS1 and ΔctsR mutant strains under physiological and heat stress conditions.

Russo P, de la Luz Mohedano M, Capozzi V, de Palencia PF, López P, Spano G, Fiocco D - Int J Mol Sci (2012)

Bottom Line: The proteomic analysis of L. plantarum WCFS1 and ctsR mutant strains confirms at the translational level the CtsR-mediated regulation of some members of the Clp family, as well as the heat induction of typical stress response genes.Heat activation of the putative CtsR regulon genes at transcriptional and translational levels, in the ΔctsR mutant, suggests additional regulative mechanisms, as is the case of hsp1.Furthermore, isoforms of ClpE with different molecular mass were found, which might contribute to CtsR quality control.

View Article: PubMed Central - PubMed

Affiliation: Department of Agriculture, Food and Environment Sciences, Via Napoli 25, Foggia 71122, Italy; E-Mails: p.russo@unifg.it (P.R.); vittorio.capozzi@gmail.com (V.C.).

ABSTRACT
Among Gram-positive bacteria, CtsR (Class Three Stress gene Repressor) mainly regulates the expression of genes encoding the Clp ATPases and the ClpP protease. To gain a better understanding of the biological significance of the CtsR regulon in response to heat-shock conditions, we performed a global proteomic analysis of Lactobacillus plantarum WCFS1 and ΔctsR mutant strains under optimal or heat stress temperatures. Total protein extracts from bacterial cells were analyzed by two-dimensional gel fractionation. By comparing maps from different culture conditions and different L. plantarum strains, image analysis revealed 23 spots with altered levels of expression. The proteomic analysis of L. plantarum WCFS1 and ctsR mutant strains confirms at the translational level the CtsR-mediated regulation of some members of the Clp family, as well as the heat induction of typical stress response genes. Heat activation of the putative CtsR regulon genes at transcriptional and translational levels, in the ΔctsR mutant, suggests additional regulative mechanisms, as is the case of hsp1. Furthermore, isoforms of ClpE with different molecular mass were found, which might contribute to CtsR quality control. Our results could add new outlooks in order to determine the complex biological role of CtsR-mediated stress response in lactic acid bacteria.

No MeSH data available.


Related in: MedlinePlus

Focus on some spots of major interest. Spot images of the Hsp3, SerRS2, ClpP, ClpB, and ClpE isoforms in L. plantarum WCFS1 wild type (A and C) and ΔctsR mutant (B and D) unstressed (A and B) or heat-treated (C and D) cultures.
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f2-ijms-13-10680: Focus on some spots of major interest. Spot images of the Hsp3, SerRS2, ClpP, ClpB, and ClpE isoforms in L. plantarum WCFS1 wild type (A and C) and ΔctsR mutant (B and D) unstressed (A and B) or heat-treated (C and D) cultures.

Mentions: Their identification, after in situ digestion with trypsin, by MALDI-TOF-TOF peptide mass fingerprinting, revealed that in several cases, different spots corresponded to essentially the same polypeptide and thus constituted different isoforms, presumably arising from in vivo post-translational modifications or due to artifacts occurring during sample handling. The characteristics of the investigated peptides are summarized in Table 1 and detailed maps of selected spots are reported in Figure 2.


Comparative proteomic analysis of Lactobacillus plantarum WCFS1 and ΔctsR mutant strains under physiological and heat stress conditions.

Russo P, de la Luz Mohedano M, Capozzi V, de Palencia PF, López P, Spano G, Fiocco D - Int J Mol Sci (2012)

Focus on some spots of major interest. Spot images of the Hsp3, SerRS2, ClpP, ClpB, and ClpE isoforms in L. plantarum WCFS1 wild type (A and C) and ΔctsR mutant (B and D) unstressed (A and B) or heat-treated (C and D) cultures.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3472708&req=5

f2-ijms-13-10680: Focus on some spots of major interest. Spot images of the Hsp3, SerRS2, ClpP, ClpB, and ClpE isoforms in L. plantarum WCFS1 wild type (A and C) and ΔctsR mutant (B and D) unstressed (A and B) or heat-treated (C and D) cultures.
Mentions: Their identification, after in situ digestion with trypsin, by MALDI-TOF-TOF peptide mass fingerprinting, revealed that in several cases, different spots corresponded to essentially the same polypeptide and thus constituted different isoforms, presumably arising from in vivo post-translational modifications or due to artifacts occurring during sample handling. The characteristics of the investigated peptides are summarized in Table 1 and detailed maps of selected spots are reported in Figure 2.

Bottom Line: The proteomic analysis of L. plantarum WCFS1 and ctsR mutant strains confirms at the translational level the CtsR-mediated regulation of some members of the Clp family, as well as the heat induction of typical stress response genes.Heat activation of the putative CtsR regulon genes at transcriptional and translational levels, in the ΔctsR mutant, suggests additional regulative mechanisms, as is the case of hsp1.Furthermore, isoforms of ClpE with different molecular mass were found, which might contribute to CtsR quality control.

View Article: PubMed Central - PubMed

Affiliation: Department of Agriculture, Food and Environment Sciences, Via Napoli 25, Foggia 71122, Italy; E-Mails: p.russo@unifg.it (P.R.); vittorio.capozzi@gmail.com (V.C.).

ABSTRACT
Among Gram-positive bacteria, CtsR (Class Three Stress gene Repressor) mainly regulates the expression of genes encoding the Clp ATPases and the ClpP protease. To gain a better understanding of the biological significance of the CtsR regulon in response to heat-shock conditions, we performed a global proteomic analysis of Lactobacillus plantarum WCFS1 and ΔctsR mutant strains under optimal or heat stress temperatures. Total protein extracts from bacterial cells were analyzed by two-dimensional gel fractionation. By comparing maps from different culture conditions and different L. plantarum strains, image analysis revealed 23 spots with altered levels of expression. The proteomic analysis of L. plantarum WCFS1 and ctsR mutant strains confirms at the translational level the CtsR-mediated regulation of some members of the Clp family, as well as the heat induction of typical stress response genes. Heat activation of the putative CtsR regulon genes at transcriptional and translational levels, in the ΔctsR mutant, suggests additional regulative mechanisms, as is the case of hsp1. Furthermore, isoforms of ClpE with different molecular mass were found, which might contribute to CtsR quality control. Our results could add new outlooks in order to determine the complex biological role of CtsR-mediated stress response in lactic acid bacteria.

No MeSH data available.


Related in: MedlinePlus