Issue 3, 2007

Multidimensional NMR spectroscopy for the study of histone H4–Ni(ii) interaction

Abstract

The N-terminal 30-amino acid tail of histone H4, a nuclear protein, was studied as a model for the interaction of this protein with Ni(II) ions. The behaviour of the ends-blocked Ac-SGRGKGGKGLGKGGA15K16R17H18R19KVLRDNIQGIT-Am fragment towards Ni(II) was analyzed with multidimensional NMR (1D, 2D TOCSY, NOESY) and UV-Vis spectroscopy. As expected, the coordination involved the imidazolic nitrogen of the His18 residue and the three deprotonated amidic nitrogens of the His18, Arg17 and Lys16 residues, respectively. A model for the structure of the complex was calculated from the inter-residual NOEs recorded in 2D NOESY spectra. The structure obtained shows that the interaction with the metal is responsible for deep changes in the conformation of the peptide, blocking the side chain of Arg17 and Lys16 residues above the coordination plane. These structural modifications may be physiologically relevant to the mechanism of nickel carcinogenesis.

Graphical abstract: Multidimensional NMR spectroscopy for the study of histone H4–Ni(ii) interaction

Supplementary files

Article information

Article type
Paper
Submitted
25 Jul 2006
Accepted
21 Nov 2006
First published
05 Dec 2006

Dalton Trans., 2007, 379-384

Multidimensional NMR spectroscopy for the study of histone H4–Ni(II) interaction

M. A. Zoroddu, M. Peana and S. Medici, Dalton Trans., 2007, 379 DOI: 10.1039/B610725G

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