Stacking of G-quadruplexes: NMR structure of a G-rich oligonucleotide with potential anti-HIV and anticancer activity
Do, N.Q., Lim, K.W., Teo, M.H., Heddi, B., Phan, A.T.(2011) Nucleic Acids Res 
- PubMed: 21840903 
- DOI: https://doi.org/10.1093/nar/gkr539
- Primary Citation of Related Structures:  
2LE6 - PubMed Abstract: 
G-rich oligonucleotides T30695 (or T30923), with the sequence of (GGGT)(4), and T40214, with the sequence of (GGGC)(4), have been reported to exhibit anti-HIV and anticancer activity. Here we report on the structure of a dimeric G-quadruplex adopted by a derivative of these sequences in K(+) solution. It comprises two identical propeller-type parallel-stranded G-quadruplex subunits each containing three G-tetrad layers that are stacked via the 5'-5' interface. We demonstrated control over the stacking of the two monomeric subunits by sequence modifications. Our analysis of possible structures at the stacking interface provides a general principle for stacking of G-quadruplexes, which could have implications for the assembly and recognition of higher-order G-quadruplex structures.
Organizational Affiliation: 
School of Physical and Mathematical Sciences and School of Biological Sciences, Nanyang Technological University, Singapore.