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Applied and Environmental Microbiology, September 2005, p. 5077-5084, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5077-5084.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Establishment of Tn5096-Based Transposon Mutagenesis in Gordonia polyisoprenivorans

Quyen Banh, Matthias Arenskötter, and Alexander Steinbüchel*

Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 3, D-48149 Münster, Germany

Received 21 January 2005/ Accepted 24 March 2005

The transposons Tn5, Tn10, Tn611, and Tn5096 were characterized regarding transposition in Gordonia polyisoprenivorans strain VH2. No insertional mutants were obtained employing Tn5 or Tn10. The thermosensitive plasmid pCG79 harboring Tn611 integrated into the chromosome of G. polyisoprenivorans; however, the insertional mutants were fairly unstable und reverted frequently to the wild-type phenotype. In contrast, various stable mutants were obtained employing Tn5096-mediated transposon mutagenesis. Auxotrophic mutants, mutants defective or deregulated in carotenoid biosynthesis, and mutants defective in utilization of rubber and/or highly branched isoprenoid hydrocarbons were obtained by integration of plasmid pMA5096 harboring Tn5096 as a whole into the genome. From about 25,000 isolated mutants, the insertion loci of pMA5096 were subsequently mapped in 20 independent mutants in genes which could be related to the above-mentioned metabolic pathways or to putative regulation proteins. Analyses of the genotypes of pMA5096-mediated mutants defective in biodegradation of poly(cis-1,4-isoprene) did not reveal homologues to recently identified genes coding for enzymes catalyzing the initial cleavage of poly(cis-1,4-isoprene). One rubber-negative mutant was disrupted in mcr, encoding an {alpha}-methylacyl-coenzyme A racemase. This mutant was defective in degradation of poly(cis-1,4-isoprene) and also of highly branched isoprenoid hydrocarbons.

* Corresponding author. Mailing address: Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 3, D-48149 Münster, Germany. Phone: 49 (251) 8339821. Fax: 49 (251) 8338388. E-mail: steinbu{at}uni-muenster.de.

Applied and Environmental Microbiology, September 2005, p. 5077-5084, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5077-5084.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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