PMID: 23875832

Authors:

Hall JP, Cook D, Morte SR, McIntyre P, Buchner K, Beer H, Cardin DJ, Brazier JA, Winter G, Kelly JM, Cardin CJ

Title:

X-ray Crystal Structure of rac-[Ru(phen)2dppz](2+) with d(ATGCAT)2 Shows Enantiomer Orientations and Water Ordering.

Journal:

J Am Chem Soc. 2013 Aug 28;135(34):12652-9. doi: 10.1021/ja403590e. Epub 2013 Aug, 14.

Abstract:

We report an atomic resolution X-ray crystal structure containing both enantiomers of rac-[Ru(phen)2dppz](2+) with the d(ATGCAT)2 DNA duplex (phen = phenanthroline; dppz = dipyridophenazine). The first example of any enantiomeric pair crystallized with a DNA duplex shows different orientations of the Lambda and Delta binding sites, separated by a clearly defined structured water monolayer. Job plots show that the same species is present in solution. Each enantiomer is bound at a TG/CA step and shows intercalation from the minor groove. One water molecule is directly located on one phenazine N atom in the Delta-enantiomer only.