Publication Date:
2012-09-27
Description:
Because various non-parallel G-quadruplexes of human telomeric sequences in K + solution can be converted to a parallel G-quadruplex by adding polyethylene glycol (PEG) as a co-solvent, we have taken advantage of this property of PEG to study the covalent attachment of a PEG unit to a G-quadruplex ligand, 3,6-bis(1-methyl-4-vinylpyridinium) carbazole diiodide (BMVC). The hybrid ligand with the PEG unit, BMVC-8C3O or BMVC-6C2O by substituting either the tetraethylene glycol or the triethylene glycol terminated with a methyl-piperidinium cation in N-9 position of BMVC, not only induces structural change from different non-parallel G-quadruplexes to a parallel G-quadruplex but also increases the melting temperature of human telomeres in K + solution by more than 45°C. In addition, our ligand work provides further confidence that the local water structure plays the key to induce conformational change of human telomere.
Print ISSN:
0305-1048
Electronic ISSN:
1362-4962
Topics:
Biology
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