Abstract
Biofilm-forming and acyl homoserine lactone (AHL) synthase-positive Pseudomonas aeruginosa N6P6 was isolated from seawater after selective enrichment with two polycyclic aromatic hydrocarbons (PAHs), viz. phenanthrene and pyrene. AHL synthesis was detected qualitatively using bioreporter strains. This marine bacterium putatively synthesized N-(3-oxododecanoyl)-l-homoserine lactone and N-butyryl-l-homoserine lactone, which were identified by TLC, GC-MS, and HPLC. Two quorum sensing (QS) genes coding for AHL synthase, i.e., lasI and rhlI, were identified in the bacterium. lasI and rhlI gene expression was studied during biofilm mode of growth at different phases using quantitative real-time PCR (qRT-PCR). The expression of lasI increased with increase in biofilm growth. In contrast, the expression of rhlI decreased during log phase of biofilm growth. The changes in lasI/rhlI expression level had significant effects (P < 0.05) on biofilm architecture and subsequent PAH degradation rate. Degradation of phenanthrene and pyrene by P. aeruginosa N6P6 was affected by biofilm growth and lasI expression. The respective phenanthrene degradation for 15, 24, 48, and 72 h old biofilm after 7 days was 21.5, 54.2, 85.6, and 85.7 %. However, the corresponding pyrene degradation was 15, 18.28, 47.56, and 46.48 %, respectively, after 7 days. A significant positive correlation (P < 0.05) was observed between lasI expression and PAHs degradation. However, in the presence of tannic acid, a QS inhibitor (QSI), PAHs degradation, biofilm formation, and pyocyanin production reduced significantly which confirmed the pivotal role of QS in biodegradation of PAHs. The findings suggest that AHLs play a pivotal role during biofilm development and subsequent bioremediation of PAHs.
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Acknowledgments
The authors would like to thank the authorities of NIT, Rourkela for providing facilities. Financial support received from the Department of Biotechnology, Ministry of Science and Technology, Government of India on the research project on bioremediation by biofilm-forming marine bacteria is gratefully acknowledged. They are also thankful to Central Instrument Facility, Bose Institute, Kolkata for providing the GC-MS and HPLC facilities.
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Mangwani, N., Kumari, S. & Das, S. Involvement of quorum sensing genes in biofilm development and degradation of polycyclic aromatic hydrocarbons by a marine bacterium Pseudomonas aeruginosa N6P6. Appl Microbiol Biotechnol 99, 10283–10297 (2015). https://doi.org/10.1007/s00253-015-6868-7
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DOI: https://doi.org/10.1007/s00253-015-6868-7