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Genetics and Molecular Biology

FinR Regulates Expression of nicC and nicX Operons, Involved in Nicotinic Acid Degradation in Pseudomonas putida KT2440

Yujie Xiao, Wenjing Zhu, Huizhong Liu, Hailing Nie, Wenli Chen, Qiaoyun Huang
Frank E. Löffler, Editor
Yujie Xiao
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
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Wenjing Zhu
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
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Huizhong Liu
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
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Hailing Nie
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
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Wenli Chen
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, China
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Qiaoyun Huang
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, ChinaKey Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan, China
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Frank E. Löffler
University of Tennessee and Oak Ridge National Laboratory
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DOI: 10.1128/AEM.01210-18
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ABSTRACT

Many proteobacteria harbor FinR homologues in their genomes as putative LysR-type proteins; however, the function of FinR is poorly studied except in the induction of fpr-1 under superoxide stress conditions in Pseudomonas putida and Pseudomonas aeruginosa. Here, by analyzing the influence of finR deletion on the transcriptomic profile of P. putida KT2440 through RNA sequencing and real-time quantitative PCR (RT-qPCR), we found 11 operons that are potentially regulated by FinR. Among them, the expression of nicC and nicX operons, which were reported to be responsible for the aerobic degradation of nicotinic acid (NA), was significantly decreased in the finR mutant, and complementation with intact finR restored the expression of the two operons. The results of bacterial NA utilization demonstrated that the deletion of finR impaired bacterial growth in minimal medium supplemented with NA/6HNA (6-hydroxynicotinic acid) as the sole carbon source and that complementation with intact finR restored the growth of the mutant strain. The expression of nicC and nicX operons was previously revealed to be repressed by the NicR repressor and induced by NA/6HNA. Our transcriptional assay revealed that the deletion of finR weakened the induction of nicC and nicX by NA/6HNA. Meanwhile, the deletion of finR largely decreased the effect of nicR deletion on the expression of nicC and nicX operons. These results suggest that finR plays a positive role and cooperates with NicR in the regulation of nicC and nicX operons. In vitro experiments showed that both FinR and NicR bound to nicX and nicC promoter regions directly. The results of this study deepened our knowledge of FinR function and nicotinic acid degradation in P. putida.

IMPORTANCE This study analyzed the influence of finR deletion on the transcriptomic profile of Pseudomonas putida KT2440. The FinR regulator is widely distributed but poorly studied in diverse proteobacteria. Here, we found 11 operons that potentially are regulated by FinR in KT2440. We further demonstrated that FinR played a positive role and cooperated with the NicR repressor in bacterial nicotinic acid (NA) degradation via regulating the expression of nicC and nicX operons. Furthermore, a transcriptomic analysis also indicated a potentially negative role of FinR in the expression of the hut cluster involved in bacterial histidine utilization. The work deepened our knowledge of FinR function and nicotinic acid degradation in P. putida.

FOOTNOTES

    • Received 19 May 2018.
    • Accepted 31 July 2018.
    • Accepted manuscript posted online 10 August 2018.
  • Supplemental material for this article may be found at https://doi.org/10.1128/AEM.01210-18.

  • Copyright © 2018 American Society for Microbiology.

All Rights Reserved.

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FinR Regulates Expression of nicC and nicX Operons, Involved in Nicotinic Acid Degradation in Pseudomonas putida KT2440
Yujie Xiao, Wenjing Zhu, Huizhong Liu, Hailing Nie, Wenli Chen, Qiaoyun Huang
Appl. Environ. Microbiol. Oct 2018, 84 (20) e01210-18; DOI: 10.1128/AEM.01210-18

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FinR Regulates Expression of nicC and nicX Operons, Involved in Nicotinic Acid Degradation in Pseudomonas putida KT2440
Yujie Xiao, Wenjing Zhu, Huizhong Liu, Hailing Nie, Wenli Chen, Qiaoyun Huang
Appl. Environ. Microbiol. Oct 2018, 84 (20) e01210-18; DOI: 10.1128/AEM.01210-18
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KEYWORDS

FinR
Pseudomonas putida KT2440
nicC and nicX operons
nicotinic acid
transcriptomic profile

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