Abstract
The phenylacetyl-CoA (Paa) catabolic pathway and genome-wide gene expression responses to phenylacetate catabolism were studied in the polychlorinated biphenyl (PCB)-degrading strain Burkholderia xenovorans LB400. Microarray and RT-qPCR analyses identified three non-contiguous chromosomal clusters of genes that are predicted to encode a complete Paa pathway that were induced up to 40-fold during growth of LB400 on phenylacetate: paaGHIJKR, paaANEBDF, and paaC. Comparison of the available genome sequences revealed that this organization is unique to Burkholderiaceae. Parallel proteomic studies identified 7 of the 14 predicted Paa proteins, most of which were detected only in phenylacetate-grown cells, but not in benzoate- or succinate-grown cells. Finally, the transcriptomic and proteomic analyses revealed the induction of at least 7 predicted catabolic pathways of aromatic compounds and some aromatic plant products (phenols, mandelate, biphenyl, C1 compounds, mevalonate, opine, and isoquinoline), as well as an oxidative stress response and a large group of transporters. Most of these genes were not induced during growth on benzoate or biphenyl, suggesting that phenylacetate or a metabolite may act as a signal that triggers multiple physiological processes. Identifying the components of the Paa pathway is important since the pathway appears to contribute to virulence of Burkholderia pathogens.
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Acknowledgments
This work was supported by Genome Canada and an NSERC Discovery Grant to LDE, and by the Superfund Basic Research Program grant P42 ES 04911-20 from the U.S. National Institute of Environmental Health Sciences. Jeff Landgraf assisted with RT-qPCR analysis.
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Communicated by Shuang-Jiang Liu.
The authors Marianna A. Patrauchan and J. Jacob Parnell contributed equally.
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Patrauchan, M.A., Parnell, J.J., McLeod, M.P. et al. Genomic analysis of the phenylacetyl-CoA pathway in Burkholderia xenovorans LB400. Arch Microbiol 193, 641–650 (2011). https://doi.org/10.1007/s00203-011-0705-x
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DOI: https://doi.org/10.1007/s00203-011-0705-x