Download MendeleyStructural basis of DNA duplex distortion induced by thiazole-containing hairpin polyamides.
Padroni, G., Parkinson, J.A., Fox, K.R., Burley, G.A.(2018) Nucleic Acids Res 46: 42-53
- PubMed: 29194552
- DOI: https://doi.org/10.1093/nar/gkx1211
- Primary Citation of Related Structures:
5OCZ, 5ODF, 5ODM, 5OE1 - PubMed Abstract:
This manuscript reports the molecular basis for double-stranded DNA (dsDNA) binding of hairpin polyamides incorporating a 5-alkyl thiazole (Nt) unit. Hairpin polyamides containing an N-terminal Nt unit induce higher melting stabilisation of target dsDNA sequences relative to an archetypical hairpin polyamide incorporating an N-terminal imidazole (Im) unit. However, modification of the N-terminus from Im to Nt-building blocks results in an increase in dsDNA binding affinity but lower G-selectivity. A general G-selectivity trend is observed for Nt-containing polyamide analogues. G-selectivity increases as the steric bulk in the Nt 5-position increases. Solution-based NMR structural studies reveal differences in the modulation of the target DNA duplex of Nt-containing hairpin polyamides relative to the Im-containing archetype. A structural hallmark of an Nt polyamide•dsDNA complex is a more significant degree of major groove compression of the target dsDNA sequence relative to the Im-containing hairpin polyamide.
Organizational Affiliation:
Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, UK.
