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Nucleic Acids Research, 1981, Vol. 9, No. 20 5469-5482
© 1981

CHEMISTRY

Determination of DNA cooperativity factor

B.R. Amirikyan, A.V. Vologodskii and Yu.L. Lyubchenko

Institute of Molecular Genetics, USSR Academy of Sciences Moscow, USSR

Received July 6, 1981. The paper presents measurements of the difference in the melting temperature of a Co1E1 DNA region when it is located inside the DNA helix and at its end. A direct comparison of calculations based on the rigorous theory of helix-coil transition with experimental data for 0.2 M Na+ (the conditions for fully reversible melting) yielded the value of 2.5-5x10–5 for the cooperatively factor {sigma}. We discuss the reversibility of DNA melting and the possibility of applying the "all-or-nothing" concept to the melting of DNA regions.


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