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Journal of Bacteriology, November 1998, p. 5505-5514, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Int-B13, an Unusual Site-Specific Recombinase of the Bacteriophage P4 Integrase Family, Is Responsible for Chromosomal Insertion of the 105-Kilobase clc Element of Pseudomonas sp. Strain B13

Roald Ravatn,dagger Sonja Studer, Alexander J. B. Zehnder, and Jan Roelof van der Meer*

Swiss Federal Institute for Environmental Science and Technology (EAWAG) and Swiss Federal Institute for Technology (ETH), CH-8600 Dübendorf, Switzerland

Received 12 June 1998/Accepted 25 August 1998

Pseudomonas sp. strain B13 carries the clcRABDE genes encoding chlorocatechol-degradative enzymes on the self-transmissible 105-kb clc element. The element integrates site and orientation specifically into the chromosomes of various bacterial recipients, with a glycine tRNA structural gene (glyV) as the integration site. We report here the localization and nucleotide sequence of the integrase gene and the activity of the integrase gene product in mediating site-specific integration. The integrase gene (int-B13) was located near the right end of the clc element. It consisted of an open reading frame (ORF) of maximally 1,971 bp with a coding capacity for 657 amino acids (aa). The full-length protein (74 kDa) was observed upon overexpression and sodium dodecyl sulfate-polyacrylamide gel electrophoresis separation. The N-terminal 430 aa of the predicted Int-B13 protein had substantial similarity to integrases from bacteriophages of the P4 family, but Int-B13 was much larger than P4-type integrases. The C-terminal 220 aa of Int-B13 were homologous to an ORF flanking a gene cluster for naphthalene degradation in Pseudomonas aeruginosa PaK1. Similar to the bacteriophages phi R73 and P4, the clc element integrates into the 3' end of the target tRNA gene. This target site was characterized from four different recipient strains into which the clc element integrated, showing sequence specificity of the integration. In Pseudomonas sp. strain B13, a circular form of the clc element, which carries an 18-bp DNA sequence identical to the 3'-end portion of glyV as part of its attachment site (attP), could be detected. Upon chromosomal integration of the clc element into a bacterial attachment site (attB), a functional glyV was reconstructed at the right end of the element. The integration process could be demonstrated in RecA-deficient Escherichia coli with two recombinant plasmids, one carrying the int-B13 gene and the attP site and the other carrying the attB site of Pseudomonas putida F1.


* Corresponding author. Mailing address: EAWAG, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland. Phone: (41) 1-823-5438. Fax: (41) 1-823-5547. E-mail: vdmeer{at}eawag.ch.

dagger Present address: Department of Molecular Genetics and Microbiology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854.


Journal of Bacteriology, November 1998, p. 5505-5514, Vol. 180, No. 21
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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