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This study analyzed the influence offinR deletion on the transcriptomic profile ofPseudomonas 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 ofnicC andnicX operons. Furthermore, a transcriptomic analysis also indicated a potentially negative role of FinR in the expression of thehut cluster involved in bacterial histidine utilization. The work deepened our knowledge of FinR function and nicotinic acid degradation inP. putida .

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