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Formation of ternary complexes involving zinc or copper ions, polynucleotides, and polypeptides containing glutamic acid and tyrosine residues

✍ Scribed by Augustin Bere; Claude Helene

Publisher: Wiley (John Wiley & Sons)
Year: 1979
Tongue: English
Weight: 682 KB
Volume: 18
Category: Article
ISSN: 0006-3525
DOI: 10.1002/bip.1979.360181103

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✦ Synopsis

Abstract

Metal ions such as Zn^2+^ and Cu^2+^ can mediate interactions between copolypeptides (Glu~x~, Tyr~y~)~n~ and polynucleotides. CD data show that these ternary complexes are characterized by an unstacking of nucleic acid bases, while the polypeptide adopts an α‐helical conformation as observed in the two binary complexes polynucleotide–cation and polypeptide–cation. Fluorescence studies demonstrate that tyrosyl side chains interact with nucleic acid bases in the ternary complexes, leading to a quenching of tyrosine fluorescence.

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