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J. Bacteriol., 07 1996, 3710-3714, Vol 178, No. 13
Copyright © 1996, American Society for Microbiology

Mutagenesis of hydroxylamine oxidoreductase in Nitrosomonas europaea by transformation and recombination

NG Hommes, LA Sayavedra-Soto and DJ Arp
Laboratory for Nitrogen Fixation Research, Oregon State University, Corvallis, Oregon 97331-2902, USA.

Mutagenesis of Nitrosomonas europaea was achieved by electroporation and recombination. To demonstrate this, an aminoglycoside 3'- phosphotransferase (kan) gene was specifically inserted into each of the three gene copies of hao individually. Southern hybridizations and PCR analysis showed the incorporation of the kan gene at the chosen genetic loci. The isolation of mutant strains was achieved in 7 to 14 days when the strains were grown on solid medium. The induced mutations were stable even in the absence of kanamycin-selective pressure for periods of up to 45 days in culture. The mutant strains did not show an observable phenotype different from that of the wild type when grown under the same conditions.


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