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2006:
Correa Bryan J; Canzio Daniele; Kahane Alexandra L; Reddy Putta Mallikarjuna; Bruice Thomas C
DNA sequence recognition by Hoechst 33258 conjugates of hairpin pyrrole/imidazole polyamides.
Bioorganic & medicinal chemistry letters 2006;
16(
14):.
A series of hairpin pyrrole/imidazole polyamides linked to a Hoechst 33258 (Ht) analogue (5-7) were synthesized on solid-phase by adopting an Fmoc technique using a series of PyBOP/HOBt mediated coupling reactions. The dsDNA binding properties of Ht-polyamides 5-7 were determined by thermal denaturation experiments. Hairpin Ht-polyamides 5-7 bound to dsDNA sequences 16 and 18 show DeltaTm values that are 14-18 degrees higher than linear Ht-polyamides bound to the same sequences. All three Ht-polyamides were found to be selective for their 9-bp match dsDNA sequences, supporting a relative stronger interaction of an Im/Py anti-parallel dimer with an appropriately positioned G/Cbp rather than sequences containing only A/Tbps. In addition, Ht-polyamides 5 and 7 showed a 20-fold preference for a properly placed G/Cbp over a C/Gbp, while 6 showed a 10-fold preference.
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