To gain a general understanding of the SOS system in Proteus species, in this study LexA-binding sites and the LexA regulons in 23 Proteus genomes were first predicted by phylogenetic footprinting server, then with Proteus vulgaris as an example, the expression of LexA regulon in iron limitation was investigated by proteomic analysis and quantitative reverse transcription polymerase chain reaction (RT-qPCR) method. The results showed that LexA proteins were highly conserved in Proteus species, and were in a close phylogenetic relationship with those in Gram-negative bacteria; the core SOS response genes lexA and recA were found in all the 23 genomes, indicating that this system was widely distributed in this genus; besides that, putative LexA-binding sites were also found in the upstream sequences of some genes involved in other biological processes such as biosynthesis, drug resistance, and stress response. Proteomic and RT-qPCR analyses showed that under iron deficient condition, the expression of lexA, recA and sulA was transcriptionally upregulated (p < 0.05), lexA was also translationally upregulated but recA was on the contrary (p < 0.05), whereas another SOS response gene dinI was transcriptionally downregulated (p < 0.01). These results indicated that in response to iron deficiency, the members of LexA regulon were not regulated by the same way, suggesting the existence of a precise regulation mechanism of SOS response in P. vulgaris. In conclusion, this study provided a preliminary understanding of the SOS system in Proteus species, which laid the foundation for further investigation of its roles in SOS response and other biological processes.
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Conflict of interest
The authors declare that they have no conflict of interest in the publication.
No human or animal subjects were involved in the experiments, so an ethical approval was not required.
Informed consent was not required in this study.
This work was supported by the Open Project Program of State Key Laboratory of Food Science and Technology, Jiangnan University (No. SKLF-KF-201921), and Shandong Provincial Key Research and Development Program, China (2019GHY112087).
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Lu, Y., Cheng, L. Computational analysis of LexA regulons in Proteus species. 3 Biotech 11, 131 (2021). https://doi.org/10.1007/s13205-021-02683-1
- Phylogenetic footprinting
- SOS response