Braunlin WH, Nordenskiöld L. A potassium-39 NMR study of potassium binding to double-helical DNA.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1984;
142:133-7. [PMID:
6745263 DOI:
10.1111/j.1432-1033.1984.tb08260.x]
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Abstract
The binding of K+ to double-helical DNA has been examined by 39K NMR. The results obtained are in substantial agreement with previous measurements of 23Na+ binding to DNA. Thus, in both cases the fractional neutralization of DNA phosphate charge appears independent of the total univalent cation concentration. Further, the dependences of the 23Na+ and 39K+ linewidths on Mg2+ and on temperature are strikingly similar. The implications of these results are discussed in terms of current theories of counterion binding to cylindrical polyelectrolytes.
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