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Title: The impact of succinate trace on pWW0 and ortho-cleavage pathway transcription in Pseudomonas putida mt-2 during toluene biodegradation
Authors: Tsipa, Argyro 
Koutinas, Michalis 
Vernardis, Spyros I. 
Mantalaris, Athanasios A. 
Keywords: Ortho-cleavage pathway;Pseudomonas putida mt-2;Succinate trace;TOL plasmid;Toluene
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: 1-Jan-2017
Publisher: Elsevier Ltd
Source: Bioresource Technology, 2017, Volume 234, Pages 397-405
Abstract: Toluene is a pollutant catabolised through the interconnected pWW0 (TOL) and ortho-cleavage pathways of Pseudomonas putida mt-2, while upon succinate and toluene mixtures introduction in batch cultures grown on M9 medium, succinate was previously reported as non-repressing. The effect of a 40 times lower succinate concentration, as compared to literature values, was explored through systematic real-time qPCR monitoring of transcriptional kinetics of the key TOL Pu, Pm and ortho-cleavage PbenR, PbenA promoters in mixed-substrate experiments. Even succinate trace inhibited transcription leading to bi-modal promoters expression. Potential carbon catabolite repression mechanisms and novel expression patterns of promoters were unfolded. Lag phase was shortened and biomass growth levels increased compared to sole toluene biodegradation suggesting enhanced pollutant removal efficiency. The study stressed the noticeable effect of a preferred compound's left-over on the main route of a bioprocess, revealing the beneficiary supply of low preferred substrates concentrations to design optimal bioremediation strategies.
ISSN: 09608524
Rights: © 2017 Elsevier Ltd
Type: Article
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