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- W2007320275 abstract "In order to expand the recognition code by hairpin polyamides to include DNA sequences of the type 5'-CWWC-3' two polyamides, PyPyPyPy-(R)(H2N)gamma-ImPyPyIm-beta-Dp (1) and PyPyPyPy-(R)(H2N)gamma-ImPy-beta-Im-beta-Dp (2) were synthesized which have in common an Py/Im pair in the terminal position for targeting C x G but differ with respect to internal placement of a beta-alanine residue. The equilibrium association constants (Ka) were determined at four DNA sites which differ at a single common position, 5'-TNTACA-3' (N = T, A, G, C). Quantitative DNase I footprint titration experiments reveal that the eight-ring hairpin PyPyPyPy-(R)(H2N)gamma-ImPyPyIm-beta-Dp (1) binds the four binding sites with similar affinities, Ka = 1.3-1.9 x 10(10) M(-1) indicating that there is no preference for the position N. In contrast, a redesigned polyamide PyPyPyPy-(R)(H2N)gamma-ImPy-beta-Im-beta-Dp (2) that places an internal flexible aliphatic beta-alanine to the 5'-side of a key imidazole group bound the match site 5'-TCTACA-3' with high affinity and good sequence discrimination (Ka(match) = 4.9 x 10(10) M(-1) and the single base pair mismatch sites with 5- to 25-fold lower affinity). These results expand the repertoire of sequences targetable by hairpins and emphasize the importance of beta-alanine as a key element for minor groove recognition." @default.
- W2007320275 created "2016-06-24" @default.
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- W2007320275 date "2001-03-01" @default.
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- W2007320275 title "Expanding the recognition of the minor groove of DNA by incorporation of β-alanine in hairpin polyamides" @default.
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- W2007320275 doi "https://doi.org/10.1016/s0968-0896(00)00282-0" @default.
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