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Nucleic Acids Research 2004 32(20):6086-6095; doi:10.1093/nar/gkh941
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Published online 18 November 2004

Nucleic Acids Research, Vol. 32 No. 20 © Oxford University Press 2004; all rights reserved

DNA recombination with a heterospecific Cre homolog identified from comparison of the pac-c1 regions of P1-related phages

Brian Sauer1,2,* and Jeffrey McDermott1

1 Stowers Institute, 1000 E 50th Street, Kansas City, MO 64110 and 2 Department of Biochemistry and Molecular Biology, University of Kansas Medical Center, Kansas City, KS 66160, USA

* To whom correspondence should be addressed. Tel: +1 816 926 4432; Fax: +1 816 926 2068; Email: BLS{at}stowers-institute.org
+AY751747–AY751749 and AY753669

Received September 22, 2004; Revised and Accepted October 26, 2004

Sequencing of the 7 kb immC region from four P1-related phages identified a novel DNA recombinase that exhibits many Cre-like characteristics, including recombination in mammalian cells, but which has a distinctly different DNA specificity. DNA sequence comparison to the P1 immC region showed that all phages had related DNA terminase, C1 repressor and DNA recombinase genes. Although these genes from phages P7, {varphi}w39 and p15B were highly similar to those from P1, those of phage D6 showed significant divergence. Moreover, the D6 sequence showed evidence of DNA deletion and substitution in this region relative to the other phages. Characterization of the D6 site-specific DNA recombinase (Dre) showed that it was a tyrosine recombinase closely related to the P1 Cre recombinase, but that it had a distinct DNA specificity for a 32 bp DNA site (rox). Cre and Dre are heterospecific: Cre did not catalyze recombination at rox sites and Dre did not catalyze recombination at lox sites. Like Cre, Dre catalyzed both integrative and excisive recombination and required no other phage-encoded proteins for recombination. Dre-mediated recombination in mammalian cells showed that, like Cre, no host bacterial proteins are required for efficient Dre-mediated site-specific DNA recombination.


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