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Applied and Environmental Microbiology, March 2003, p. 1408-1416, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1408-1416.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Construction and Screening of Metagenomic Libraries Derived from Enrichment Cultures: Generation of a Gene Bank for Genes Conferring Alcohol Oxidoreductase Activity on Escherichia coli

Anja Knietsch,1 Tanja Waschkowitz,1 Susanne Bowien,1 Anke Henne,2 and Rolf Daniel1*

Abteilung Allgemeine Mikrobiologie,1 Göttingen Genomics Laboratory, Institut für Mikrobiologie und Genetik der Georg-August-Universität, 37077 Göttingen, Germany2

Received 3 October 2002/ Accepted 27 November 2002

Enrichment of microorganisms with special traits and the construction of metagenomic libraries by direct cloning of environmental DNA have great potential for identifying genes and gene products for biotechnological purposes. We have combined these techniques to isolate novel genes conferring oxidation of short-chain (C2 to C4) polyols or reduction of the corresponding carbonyls. In order to favor the growth of microorganisms containing the targeted genes, samples collected from four different environments were incubated in the presence of glycerol and 1,2-propanediol. Subsequently, the DNA was extracted from the four samples and used to construct complex plasmid libraries. Approximately 100,000 Escherichia coli strains of each library per test substrate were screened for the production of carbonyls from polyols on indicator agar. Twenty-four positive E. coli clones were obtained during the initial screen. Sixteen of them contained a plasmid (pAK101 to pAK116) which conferred a stable carbonyl-forming phenotype. Eight of the positive clones exhibited NAD(H)-dependent alcohol oxidoreductase activity with polyols or carbonyls as the substrates in crude extracts. Sequencing revealed that the inserts of pAK101 to pAK116 encoded 36 complete and 17 incomplete presumptive protein-encoding genes. Fifty of these genes showed similarity to sequenced genes from a broad collection of different microorganisms. The genes responsible for the carbonyl formation of E. coli were identified for nine of the plasmids (pAK101, pAK102, pAK105, pAK107 to pAK110, pAK115, and pAK116). Analyses of the amino acid sequences deduced from these genes revealed that three (orf12, orf14, and orf22) encoded novel alcohol dehydrogenases of different types, four (orf5, sucB, fdhD, and yabF) encoded novel putative oxidoreductases belonging to groups distinct from alcohol dehydrogenases, one (glpK) encoded a putative glycerol kinase, and one (orf1) encoded a protein which showed no similarity to any other known gene product.

* Corresponding author. Mailing address: Institut für Mikrobiologie und Genetik der Georg-August-Universität, Grisebachstr. 8, 37077 Göttingen, Germany. Phone: 49 551 393827. Fax: 49 551 393793. E-mail: rdaniel{at}gwdg.de.

Applied and Environmental Microbiology, March 2003, p. 1408-1416, Vol. 69, No. 3
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.3.1408-1416.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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