Download MendeleyStructure of an unprecedented G-quadruplex scaffold in the human c-kit promoter.
Phan, A.T., Kuryavyi, V.V., Burge, S., Neidle, S., Patel, D.J.(2007) J Am Chem Soc 129: 4386-4392
- PubMed: 17362008
- DOI: https://doi.org/10.1021/ja068739h
- Primary Citation of Related Structures:
2O3M - PubMed Abstract:
The c-kit oncogene is an important target in the treatment of gastrointestinal tumors. A potential approach to inhibition of the expression of this gene involves selective stabilization of G-quadruplex structures that may be induced to form in the c-kit promoter region. Here we report on the structure of an unprecedented intramolecular G-quadruplex formed by a G-rich sequence in the c-kit promoter in K+ solution. The structure represents a new folding topology with several unique features. Most strikingly, an isolated guanine is involved in G-tetrad core formation, despite the presence of four three-guanine tracts. There are four loops: two single-residue double-chain-reversal loops, a two-residue loop, and a five-residue stem-loop, which contain base-pairing alignments. This unique structural scaffold provides a highly specific platform for the future design of ligands specifically targeted to the promoter DNA of c-kit.
Organizational Affiliation:
Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA. phantuan@ntu.edu.sg
