Abstract
Pseudomonas sp. strain NyZ402 was isolated for its ability to grow on para-nitrophenol (PNP) as a sole source of carbon, nitrogen, and energy, and was shown to degrade PNP via an oxidization pathway. This strain was also capable of growing on hydroquinone or catechol. A 15, 818 bp DNA fragment extending from a 800-bp DNA fragment of hydroxyquinol 1,2-dioxygenase gene (pnpG) was obtained by genome walking. Sequence analysis indicated that the PNP catabolic gene cluster (pnpABCDEFG) in this fragment shared significant similarities with a recently reported gene cluster responsible for PNP degradation from Pseudomonas sp. strain WBC-3. PnpA is PNP 4-monooxygenase converting PNP to hydroquinone via benzoquinone in the presence of NADPH, and genetic analysis indicated that pnpA plays a key role in PNP degradation. pnpA1 present in the upstream of the cluster (absent in the cluster from strain WBC-3) encodes a protein sharing as high as 55% identity with PnpA, but was not involved in PNP degradation by either in vitro or in vivo analyses. Furthermore, an engineered strain capable of growing on PNP and ortho-nitrophenol (ONP) was constructed by introducing onpAB (encoding ONP monooxygenase and ortho-benzoquinone reductase which catalyzed the transformation of ONP to catechol) from Alcaligenes sp. strain NyZ215 into strain NyZ402.
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This work was supported by the National High Technology Research and Development Program of China (grant 2007AA10Z402), the Knowledge Innovation Program of the Chinese Academy of Sciences (grant KSCX2-YW-G-072), and National Natural Science Foundation of China (grant 30800015).
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Wei, Q., Liu, H., Zhang, JJ. et al. Characterization of a para-nitrophenol catabolic cluster in Pseudomonas sp. strain NyZ402 and construction of an engineered strain capable of simultaneously mineralizing both para- and ortho-nitrophenols. Biodegradation 21, 575–584 (2010). https://doi.org/10.1007/s10532-009-9325-4
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DOI: https://doi.org/10.1007/s10532-009-9325-4