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Regulatory Feedback Loop of Two phz Gene Clusters through 5′-Untranslated Regions in Pseudomonas sp. M18

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Listed:
  • Yaqian Li
  • Xilin Du
  • Zhi John Lu
  • Daqiang Wu
  • Yilei Zhao
  • Bin Ren
  • Jiaofang Huang
  • Xianqing Huang
  • Yuhong Xu
  • Yuquan Xu

Abstract

Background: Phenazines are important compounds produced by pseudomonads and other bacteria. Two phz gene clusters called phzA1-G1 and phzA2-G2, respectively, were found in the genome of Pseudomonas sp. M18, an effective biocontrol agent, which is highly homologous to the opportunistic human pathogen P. aeruginosa PAO1, however little is known about the correlation between the expressions of two phz gene clusters. Methodology/Principal Findings: Two chromosomal insertion inactivated mutants for the two gene clusters were constructed respectively and the correlation between the expressions of two phz gene clusters was investigated in strain M18. Phenazine-1-carboxylic acid (PCA) molecules produced from phzA2-G2 gene cluster are able to auto-regulate expression itself and activate the expression of phzA1-G1 gene cluster in a circulated amplification pattern. However, the post-transcriptional expression of phzA1-G1 transcript was blocked principally through 5′-untranslated region (UTR). In contrast, the phzA2-G2 gene cluster was transcribed to a lesser extent and translated efficiently and was negatively regulated by the GacA signal transduction pathway, mainly at a post-transcriptional level. Conclusions/Significance: A single molecule, PCA, produced in different quantities by the two phz gene clusters acted as the functional mediator and the two phz gene clusters developed a specific regulatory mechanism which acts through 5′-UTR to transfer a single, but complex bacterial signaling event in Pseudomonas sp. strain M18.

Suggested Citation

  • Yaqian Li & Xilin Du & Zhi John Lu & Daqiang Wu & Yilei Zhao & Bin Ren & Jiaofang Huang & Xianqing Huang & Yuhong Xu & Yuquan Xu, 2011. "Regulatory Feedback Loop of Two phz Gene Clusters through 5′-Untranslated Regions in Pseudomonas sp. M18," PLOS ONE, Public Library of Science, vol. 6(4), pages 1-12, April.
  • Handle: RePEc:plo:pone00:0019413
    DOI: 10.1371/journal.pone.0019413
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    1. C. K. Stover & X. Q. Pham & A. L. Erwin & S. D. Mizoguchi & P. Warrener & M. J. Hickey & F.S. L. Brinkman & W. O. Hufnagle & D. J. Kowalik & M. Lagrou & R. L. Garber & L. Goltry & E. Tolentino & S. We, 2000. "Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen," Nature, Nature, vol. 406(6799), pages 959-964, August.
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