Structural studies reveal the enantiospecific recognition of a DNA G-quadruplex by a ruthenium polypyridyl complex

McQuaid, K., Abell, H., Gurung, S. P., Allan, D. R., Winter, G., Sorensen, T., Cardin, D. J., Brazier, J. A. ORCID: https://orcid.org/0000-0002-4952-584X, Cardin, C. J. ORCID: https://orcid.org/0000-0002-2556-9995 and Hall, J. P. ORCID: https://orcid.org/0000-0003-3716-4378 (2019) Structural studies reveal the enantiospecific recognition of a DNA G-quadruplex by a ruthenium polypyridyl complex. Angewandte Chemie International Edition, 58 (29). pp. 9881-9885. ISSN 1433-7851 doi: 10.1002/anie.201814502

Abstract/Summary

Using X-ray crystallography, we show an enantiospecificity in DNA G-quadruplex binding, using the complexes Λ/∆-[Ru(TAP)2(dppz-11-CN)]2+ (TAP=1,4,5,8-tetraazaphenanthrene) containing the dppz (dipyridophenazine) ligand, paralleling the specificity of the complexes with duplex DNA. The Λ complex crystallises with the normally parallel stranded d(TAGGGTTA) tetraplex to give the first such antiparallel strand assembly in which syn-guanosine is adjacent to the complex at the 5’ end of the quadruplex core. SRCD measurements confirm that the same conformational switch occurs in solution. The Δ enantiomer, by contrast, is present in the structure but stacked at the ends of the assembly. In addition, we report the structure of Λ-[Ru(phen)2(11-CN-dppz)]2+ bound to d(TCGGCGCCGA), a duplex forming sequence, and use both structural models to aid in the elucidation of the motif-specific luminescence response of the isostructural phen analogue enantiomers.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/83173
Item Type	Article
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > NMR (CAF) Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Optical Spectroscopy (CAF) Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) > Xray (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Medicinal Chemistry Research Group
Publisher	John Wiley & Sons
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