کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5370574 | 1503890 | 2017 | 9 صفحه PDF | دانلود رایگان |
- C8-conjugates of pyrrolobenzodiazepines with benzofused rings modulate sequence-selective DNA binding.
- The conjugates bind best to guanines flanked by A/T-rich sequences.
- Bi- and tri-phasic melting curves show that 14-mer oligonucleotides can bind more than one ligand.
DNA footprinting and melting experiments have been used to examine the sequence-specific binding of C8-conjugates of pyrrolobenzodiazepines (PBDs) and benzofused rings including benzothiophene and benzofuran, which are attached using pyrrole- or imidazole-containing linkers. The conjugates modulate the covalent attachment points of the PBDs, so that they bind best to guanines flanked by A/T-rich sequences on either the 5â²- or 3â²-side. The linker affects the binding, and pyrrole produces larger changes than imidazole. Melting studies with 14-mer oligonucleotide duplexes confirm covalent attachment of the conjugates, which show a different selectivity to anthramycin and reveal that more than one ligand molecule can bind to each duplex.
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Journal: Biophysical Chemistry - Volume 230, November 2017, Pages 53-61