Table of Contents
Metal-Based Drugs
Volume 7 (2000), Issue 5, Pages 253-256

Comparative Analysis of [Au(en)2]3+ and [Pt(en)2]2+ non Covalent Binding to Calf Thymus DNA

1CIRCMSB, Unit of Florence, via Gino Capponi 7, Florence I-50121, Italy
2Department of Chemistry, University of Florence, Florence I-50121, Italy

Received 8 December 2000; Accepted 14 December 2000

Copyright © 2000 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Reactions of the complexes bisethylendiammine gold(III) and bisethylendiammine platinum(II) with calfthymus DNA were comparatively analysed. Both complexes bind DNA non-covalently most probably on the basis of electrostatic interactions. Binding of either complex at low ratios results into modest modifications of B-type DNA conformations, as detected by CD. Far larger CD alterations are observed at high ratios. The gold(III) chromophore is scarcely perturbed by DNA addition Binding of [Au(en)2]Cl3 to calf thymus DNA is reversed by sodium cyanide. By analogy with the case of [Pt(en)2]Cl2 it is suggested that Auen acts as a minor groove binder.