Bacteriophage P1 Cre-loxP site-specific recombination. Site-specific DNA topoisomerase activity of the Cre recombination protein - PubMed (original) (raw)
. 1986 Jan 5;261(1):391-6.
- PMID: 3001054
Bacteriophage P1 Cre-loxP site-specific recombination. Site-specific DNA topoisomerase activity of the Cre recombination protein
K Abremski et al. J Biol Chem. 1986.
Abstract
Site-specific recombination in bacteriophage P1 occurs between two loxP sites in the presence of the Cre recombination protein. The structure of the 34-base pair loxP site consists of two 13-base pair inverted repeats separated by an 8-base pair spacer region. A mutation in the loxP site has been constructed which deletes one of the internal bases of the spacer region at the axis of dyad symmetry. This mutant loxP site shows a 10-fold reduction in recombination activity with a wild-type site both in vivo and in vitro. This low level of intramolecular recombination between a wild-type loxP site and the mutant loxP501 site is observed in vitro only when the DNA substrate is supercoiled. The majority of the supercoiled substrate is relaxed by the Cre protein, and on longer incubations, single-stranded nicks accumulate in the DNA. We have determined that these nicks occur in both the wild-type and the mutant sites. The positions of these nicks correspond to the positions of cleavage found during recombination of two wild-type sites, suggesting that the Cre protein is attempting to carry out recombination with the mutant site but most of the time this reaction is abortive. We have determined that the Cre protein relaxes a supercoiled topoisomer of a DNA substrate containing one wild-type site and one mutant site to yield a distribution of topoisomers whose linking numbers differ by steps of one, indicating that Cre can act as a type I topoisomerase.
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