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J. Bacteriol., 09 1996, 5164-5173, Vol 178, No. 17
Copyright © 1996, American Society for Microbiology

A resolvase-like protein is required for the site-specific integration of the temperate lactococcal bacteriophage TP901-1

B Christiansen, L Brondsted, FK Vogensen and K Hammer
Department of Microbiology, Technical University of Denmark, Lyngby, Denmark.

The integration system of the temperate lactococcal phage TP901-1 was characterized in Lactococcus lactis subsp. cremoris LM0230 and MG1363 with the use of deletion derivatives of the integration vector pBC143 (B. Christiansen, M. G. Johnsen, E. Stenby, F. K. Vogensen, and K. Hammer, J. Bacteriol. 176:1069-1076, 1994). The phage-encoded elements necessary for integration were localized on a 2.8-kb NsiI-EcoRI fragment including the phage attachment site, attP. This fragment was DNA sequenced, and sequence analysis revealed three putatively expressed open reading frames, Orf1, Orf2, and Orf3 By the introduction of mutations within the orf1, orf2, and orf3 genes, it was shown that only Orf1 was necessary for the integration process. Furthermore, it was found that Orf1, attP, and a 425-bp region upstream of the orf1 gene are sufficient for integration. Orf1 contains 485 amino acids and is located just upstream of attP. The N-terminal 150 to 180 amino acids of Orf1 showed 38 to 44% similarity to the resolvase group of site- specific integrases, while no similarity to known proteins was found in the C-terminal end. Bacteriophage TP901-1 therefore contains a unique integration system that does not resemble the Int class of site- specific integrases usually found in temperate bacteriophages. The constructed integration vector, pBC170, integrates into the chromosomal attachment site very efficiently and forms stable transformants with a frequency corresponding to 20% of the transformation efficiency.


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