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Cooperative nonenzymic base recognition. Thermodynamics of the helix—coil transition of a monomer—polymer double helix

✍ Scribed by Geoffrey W. Hoffman; Dietmar Pörschke

Publisher
Wiley (John Wiley & Sons)
Year
1973
Tongue
English
Weight
573 KB
Volume
12
Category
Article
ISSN
0006-3525

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✦ Synopsis

Abstract

The double‐helical complex formed from m^6^m^9^A and poly U has been characterized by circular dichroism and u.v. spectrophotometry. The circular dichroism of the complex is similar to that of the double‐helical poly A poly U complex both in shape and in magnitude and thus indicates a quite similar structure. The double Helix–coil transition has been studied at various nucleotide concentrations and at three different ionic strengths. As expected for the binding of a base to a polymer, the Helix–coil transition is shifted to higher temperatures by increasing nucleotide concentrations, but is not affected by changes of the ionic strength. The melting curves are analyzed according to a linear Ising model taking the stacking of the monomers into account. At 0°C the equilibrium constant for nucleation is found to be 2–5 M^−1^ and that for chain growth is 500 M^−1^. The enthalpy change associated with chain growth is −11.2 ± 1 kcal M^−1^.

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