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Porphyrins are among the first ligands that have been tested for their quadruplex binding and stabilization potential. We report the differential interaction of the positional cationic porphyrin isomers TMPyP3 and TMPyP4 with a parallel G‐quadruplex (GQ) formed by 33‐mer (TP) regulatory sequence present in the promoter region of the human multidrug resistance protein 1 (MRP1) transporter gene. This...
Most of the important genomic regions, especially the G,C rich gene promoters, consist of sequences with potential to form G,C‐tetraplexes on both the DNA strands. In this study, we used three C‐rich oligonucleotides (11Py, 21Py, and HTPy), of which 11Py and 21Py are located at various transcriptional regulatory elements of the human genome while HTPy sequence is a C‐rich strand of human telomere...
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