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Journal of Bacteriology, August 2000, p. 4241-4248, Vol. 182, No. 15
E. I. DuPont de Nemours Co., Central
Research and Development, Wilmington, Delaware 19800-0328
Received 31 January 2000/Accepted 4 May 2000
The technique of mRNA differential display was used to identify
simultaneously two metabolic genes involved in the degradation of
cyclohexanone in a new halotolerant Brevibacterium
environmental isolate. In a strategy based only on the knowledge that
cyclohexanone oxidation was inducible in this strain, the mRNA
population of cells exposed to cyclohexanone was compared to that of
control cells using reverse transcription-PCR reactions primed with a collection of 81 arbitrary oligonucleotides. Three DNA fragments encoding segments of flavin monooxygenases were isolated with this
technique, leading to the identification of the genes of two distinct
cyclohexanone monooxygenases, the enzymes responsible for the oxidation
of cyclohexanone. Each monooxygenase was expressed in Escherichia
coli and characterized. This work validates the application of
mRNA differential display for the discovery of new microbial metabolic genes.
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Simultaneous Identification of Two Cyclohexanone
Oxidation Genes from an Environmental Brevibacterium Isolate
Using mRNA Differential Display
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Corresponding author. Mailing address: E. I. DuPont de Nemours Co., Central Research and Development, E328/B46,
Wilmington, DE 19800-0328. Phone: (302) 695-1782. Fax: (302)
695-1829. E-mail: Pierre.E.Rouviere{at}USA.Dupont.com.
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