Abstract
The bis-(3′-5′)-cyclic dimeric guanosine monophosphate (c-di-GMP) is a ubiquitous second messenger that determines bacterial lifestyle between the planktonic and biofilm modes of life. Although the role of c-di-GMP signaling in biofilm development and dispersal has been extensively studied, how c-di-GMP signaling influences environmental bioprocess activities such as biodegradation remains unexplored. To elucidate the impacts of elevating c-di-GMP level on environmental bioprocesses, we constructed a Comamonas testosteroni strain constitutively expressing a c-di-GMP synthase YedQ from Escherichia coli and examined its capability in biofilm formation and biodegradation of 3-chloroaniline (3-CA). The high c-di-GMP strain exhibited an increased binding to Congo red dye, a decreased motility, and an enhanced biofilm formation capability. In planktonic cultures, the strain with an elevated c-di-GMP concentration and the wild type could degrade 3-CA comparably well. However, under batch growth conditions with a high surface to volume ratio, an elevated c-di-GMP concentration in C. testosteroni significantly increased the contribution of biofilms in 3-CA biodegradation. In continuous submerged biofilm reactors, C. testosteroni with an elevated c-di-GMP level exhibited an enhanced 3-CA biodegradation and a decreased cell detachment rate. Taken together, this study provides a novel strategy to enhance biofilm-based biodegradation of toxic xenobiotic compounds through manipulating bacterial c-di-GMP signaling.
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Acknowledgments
The c-di-GMP quantification was carried out with the help of Dr. Peter Imre Benke and Professor Sanjay Swarup in the Metabolomics Laboratory of the Singapore Centre on Environmental Life Sciences Engineering (SCELSE). We thank Dr. Liang Yang for providing the plasmids used in this study. We also thank William Jak Soon Phang and Hari Seshan for their assistance. This research was supported by the National Research Foundation and Ministry of Education Singapore under its Research Centre of Excellence Programme, SCELSE (M4330005.C70) and a Start-up Grant (M4080847.030) from the College of Engineering, Nanyang Technological University, Singapore. The authors thank the Singapore Ministry of Education for providing research scholarship to Yichao Wu (Grant No. MOE2011-T2-2-035, ARC 3/12).
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Wu, Y., Ding, Y., Cohen, Y. et al. Elevated level of the second messenger c-di-GMP in Comamonas testosteroni enhances biofilm formation and biofilm-based biodegradation of 3-chloroaniline. Appl Microbiol Biotechnol 99, 1967–1976 (2015). https://doi.org/10.1007/s00253-014-6107-7
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DOI: https://doi.org/10.1007/s00253-014-6107-7