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. 1985 Mar;161(3):1103–1111. doi: 10.1128/jb.161.3.1103-1111.1985

Comparison of physical and genetic properties of palindromic DNA sequences.

G J Warren, R L Green
PMCID: PMC215013  PMID: 2982785

Abstract

Some viable palindromic DNA sequences were found to cause an increase in the recovery of genetic recombinants. Although these palindromes contained no Chi sites, their presence in cis caused apparent recA+-dependent recombination to increase severalfold. This biological property did not correlate with the physical properties of the palindromes' extrusion of cruciform structures in vitro. Thus, two unrelated palindromes with similar effects on recombination in both Escherichia coli and Pseudomonas syringae displayed quite different kinetics of cruciform formation. In plasmids of native superhelical density, one palindrome underwent rapid cruciform formation at 55 degrees C, whereas the other did not form detectable cruciforms at any temperature. A shorter palindrome with similarly rapid kinetics of cruciform formation did not affect recombination detectably. The lack of a clear relationship between physical and genetic properties was also demonstrated in the case of longer, inviable palindromes. Here we found that the degree of asymmetry required in vivo to rescue a long palindrome from inviability far exceeded that required to kinetically prohibit cruciform extrusion in vitro.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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