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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Engineering of solvent-tolerant Pseudomonas putida S12 for bioproduction of phenol from glucose.

Efficient bioconversion of glucose to phenol via the central metabolite tyrosine was achieved in the solvent-tolerant strain Pseudomonas putida S12. The tpl gene from Pantoea agglomerans, encoding tyrosine phenol lyase, was introduced into P. putida S12 to enable phenol production. Tyrosine availability was a bottleneck for efficient production. The production host was optimized by overexpressing the aroF-1 gene, which codes for the first enzyme in the tyrosine biosynthetic pathway, and by random mutagenesis procedures involving selection with the toxic antimetabolites m-fluoro-dl-phenylalanine and m-fluoro-l-tyrosine. High-throughput screening of analogue-resistant mutants obtained in this way yielded a P. putida S12 derivative capable of producing 1.5 mM phenol in a shake flask culture with a yield of 6.7% (mol/mol). In a fed-batch process, the productivity was limited by accumulation of 5 mM phenol in the medium. This toxicity was overcome by use of octanol as an extractant for phenol in a biphasic medium-octanol system. This approach resulted in accumulation of 58 mM phenol in the octanol phase, and there was a twofold increase in the overall production compared to a single-phase fed batch.[1]

References

  1. Engineering of solvent-tolerant Pseudomonas putida S12 for bioproduction of phenol from glucose. Wierckx, N.J., Ballerstedt, H., de Bont, J.A., Wery, J. Appl. Environ. Microbiol. (2005) [Pubmed]
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