Specific interactions of distamycin with G-quadruplex DNA
- 1 June 2003
- journal article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 31 (11) , 2944-2951
- https://doi.org/10.1093/nar/gkg392
Abstract
Distamycin binds the minor groove of duplex DNA at AT-rich regions and has been a valuable probe of protein interactions with double-stranded DNA. We find that distamycin can also inhibit protein interactions with G-quadruplex (G4) DNA, a stable four-stranded structure in which the repeating unit is a G-quartet. Using NMR, we show that distamycin binds specifically to G4 DNA, stacking on the terminal G-quartets and contacting the flanking bases. These results demonstrate the utility of distamycin as a probe of G4 DNA-protein interactions and show that there are (at least) two distinct modes of protein-G4 DNA recognition which can be distinguished by sensitivity to distamycin.Keywords
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