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. 1983 Sep;80(18):5545–5549. doi: 10.1073/pnas.80.18.5545

Slow cruciform transitions in palindromic DNA.

M Gellert, M H O'Dea, K Mizuuchi
PMCID: PMC384294  PMID: 6577442

Abstract

Extrusion of cruciform structures in self-complementary regions of DNA is known to be favored by negative supercoiling of DNA. We show here that, in moderately supercoiled DNA, cruciform extrusion is a very slow process. In plasmid pUC7 DNA, with a 48-base-pair palindrome, the half-time of extrusion at 50 degrees C is typically several hours; rates are even slower at lower temperature. The rates increase significantly with increasing DNA supercoiling but are only slightly faster in DNA species with much longer palindromes. The reabsorption of cruciform arms is also very slow. The equilibrium between cruciform and regular DNA structures is sensitive to changes in the linking number. Measurement of this equilibrium leads to an estimate of 18 kcal/mol (75.3 kJ/mol) for the free energy required to generate a cruciform structure. In bacterial cells, cruciform DNA may be rare, even when it is thermodynamically favored, because of its slow formation.

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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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