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Interactions between copolypeptides containing Glu and Tyr residues and polynucleotides can be mediated through divalent metal ions such as Zn-2+ and Ci-2+. Circular dichroism studies show that the binding of metal ion - polypeptide complexes to poly(A) induces an unstacking of adenine bases. Fluorescence investigations demonstrate that Tyrosine - Adenine interactions result from the formation of ternary complexes polypeptide-Zn-2 plus-polynucleotide.
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Claude Hélène (1975) studied this question.
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