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Applied and Environmental Microbiology, January 2006, p. 753-759, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.753-759.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Multicopy Integration and Expression of Heterologous Genes in Methylobacterium extorquens ATCC 55366{dagger}

Young J. Choi, Denis Bourque, Lyne Morel, Denis Groleau, and Carlos B. Míguez*

Microbial and Enzymatic Technology Group, Bioprocess Platform, Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Ave., Montreal, Quebec H4P 2R2, Canada

Received 8 August 2005/ Accepted 22 September 2005

High-level expression of chromosomally integrated genes in Methylobacterium extorquens ATCC 55366 was achieved under the control of the strong M. extorquens AM1 methanol dehydrogenase promoter (PmxaF) using the mini-Tn7 transposon system. Stable maintenance and expression of the integrated genes were obtained in the absence of antibiotic selective pressure. Furthermore, using this technology, a multicopy integration protocol for M. extorquens was also developed. Chromosomal integration of one to five copies of the gene encoding the green fluorescent protein (gfp) was achieved. The multicopy-based expression system permitted expression of a preset number of gene copies. A unique specific Tn7 integration locus in the chromosome of M. extorquens, known as the Tn7 attachment site (attTn7 site), was identified. This single attTn7 site was identified in an intergenic region between glmS, which encodes the essential enzyme glucosamine-6-phosphate synthetase, and dhaT, which encodes 1,3-propanediol dehydrogenase. The fact that the integration event is site specific and the fact that the attTn7 site is a noncoding region of the chromosome make the mini-Tn7 transposon system very useful for insertion of target genes and subsequent expression. In all transformants tested, expression and segregation of the transforming gene were stable without generation of secondary mutations in the host. In this paper, we describe single and multicopy chromosome integration and stable expression of heterologous genes (bgl [ß-galactosidase], est [esterase], and gfp [green fluorescent protein]) in M. extorquens.

* Corresponding author. Mailing address: Microbial and Enzymatic Technology Group, Bioprocess Platform, Biotechnology Research Institute, National Research Council of Canada, 6100 Royalmount Ave., Montreal, Quebec H4P 2R2, Canada. Phone: (514) 496-6280. Fax: (514) 496-7251. E-mail: carlos.miguez{at}nrc-cnrc.gc.ca

{dagger} National Research Council of Canada publication number 47749.

Applied and Environmental Microbiology, January 2006, p. 753-759, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.753-759.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Choi, Y. J., Gringorten, J. L., Belanger, L., Morel, L., Bourque, D., Masson, L., Groleau, D., Miguez, C. B. (2008). Production of an Insecticidal Crystal Protein from Bacillus thuringiensis by the Methylotroph Methylobacterium extorquens. Appl. Environ. Microbiol. 74: 5178-5182 [Abstract] [Full Text]  
  • Choi, Y. J., Morel, L., Bourque, D., Mullick, A., Massie, B., Miguez, C. B. (2006). Bestowing Inducibility on the Cloned Methanol Dehydrogenase Promoter (PmxaF) of Methylobacterium extorquens by Applying Regulatory Elements of Pseudomonas putida F1. Appl. Environ. Microbiol. 72: 7723-7729 [Abstract] [Full Text]  


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