Download MendeleySolution structures of multiple G-quadruplex complexes induced by a platinum(II)-based tripod reveal dynamic binding
Liu, W., Zhong, Y.F., Liu, L.Y., Shen, C.T., Zeng, W., Wang, F., Yang, D., Mao, Z.W.(2018) Nat Commun 9: 3496-3496
- PubMed: 30158518
- DOI: https://doi.org/10.1038/s41467-018-05810-4
- Primary Citation of Related Structures:
5Z80, 5Z8F - PubMed Abstract:
DNA G-quadruplexes are not only attractive drug targets for cancer therapeutics, but also have important applications in supramolecular assembly. Here, we report a platinum(II)-based tripod (Pt-tripod) specifically binds the biological relevant hybrid-1 human telomeric G-quadruplex (Tel26), and strongly inhibits telomerase activity. Further investigations illustrate Pt-tripod induces the formation of monomeric and multimeric Pt-tripod‒Tel26 complex structures in solution. We solve the 1:1 and the unique dimeric 4:2 Pt-tripod-Tel26 complex structures by NMR. The structures indicate preferential binding of Pt-tripod to the 5'-end of Tel26 at a low Pt-tripod/Tel26 ratio of 0-1.0. After adding more Pt-tripod, the Pt-tripod binds the 3'-end of Tel26, unexpectedly inducing a unique dimeric 4:2 structure interlocked by an A:A non-canonical pair at the 3'-end. Our structures provide a structural basis for understanding the dynamic binding of small molecules with G-quadruplex and DNA damage mechanisms, and insights into the recognition and assembly of higher-order G-quadruplexes.
Organizational Affiliation:
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, China.
