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Science 17 August 1990:
Vol. 249. no. 4970, pp. 778 - 781
DOI: 10.1126/science.249.4970.778
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Articles

Rapid, Sensitive Bioluminescent Reporter Technology for Naphthalene Exposure and Biodegradation

J. M. H. King 1, P. M. DiGrazia 1, B. Applegate 1, R. Burlage 1, J. Sanseverino 1, P. Dunbar 1, F. Larimer 2, and G. S. Sayler 1

1 Center for Environmental Biotechnology, University of Tennessee, 10515 Research Drive, Suite 200, Knoxville, TN 37932
2 Biology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831

A bioluminescent reporter plasmid for naphthalene catabolism (pUTK21) was developed by transposon (Tn4431) insertion of the lux gene cassette from Vibrio fischeri into a naphthalene catabolic plasmid in Pseudomonas fluorescens. The insertion site of the lux transposon was the nahG gene encoding for salicylate hydroxylase. Luciferasemediated light production from P. fluorescens strains harboring this plasmid was induced on exposure to naphthalene or the regulatory inducer metabolite, salicylate. In continuous culture, light induction was rapid (15 minutes) and was highly responsive to dynamic changes in naphthalene exposure. Strains harboring pUTK21 were responsive to aromatic hydrocarbon contamination in Manufactured Gas Plant soils and produced sufficient light to serve as biosensors of naphthalene exposure and reporters of naphthalene biodegradative activity. The robust and sensitive nature of the bioluminescent reporter technology suggests that new sensing methods can be developed for on-line process monitoring and control in complex environmental matrices.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)