Temperature dependent Z→B transitions in poly (dG-dC)

Latha, P. K. ; Majumder, Kumud ; Brahmachari, Samir K. (1983) Temperature dependent Z→B transitions in poly (dG-dC) Current Science, 52 (19). pp. 907-910. ISSN 0011-3891

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The effect of temperature on the Z-form of poly(dG-dC) in a medium of low dielectric constant has been studied. A novel temperature-dependent reversible Z⇌B transition is observed in 60% (v/v) alcohol. The mid-point transition(T1 is found to be lowered from 65°C to 40°C when an extra 1.5m M NaCl was added to the solution having a sodium:phosphate ratio of 1:1. Analysis of the temperature dependent Z-B transitions both in the presence and absence of 1.5 mM NaCl reveals a positive change in enthalphy.

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