Investigating a quadruplex-ligand interaction by unfolding kinetics.
Investigating a quadruplex-ligand interaction by unfolding kinetics.
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DOI:
10.1021/ja0615425
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发表时间:
2006-08-02
影响因子:
15
通讯作者:
Balasubramanian, Shankar
中科院分区:
文献类型:
--
作者:
Green, Jeremy J.;Ladame, Sylvain;Ying, Liming;Klenerman, David;Balasubramanian, Shankar
We have investigated the interaction of the intramolecular human telomeric DNA G-quadruplex with a hemicyanine–peptide ligand, by studying the rate of quadruplex opening with a complementary DNA oligonucleotide. By employing a minimal kinetic model, the relationship between the observed rate of quadruplex opening and the ligand concentration has enabled estimation of the dissociation constant. A van't Hoff analysis revealed the enthalpy and entropy changes of binding to be −77 ± 22 kJ mol−1 and −163 ± 75 J mol−1 K−1, respectively. Arrhenius analyses of the rate constants of opening free and bound quadruplex gave activation energies of 118 ± 2 and 98 ± 10 kJ mol−1, respectively. These results indicate that the presence of the ligand has only a small effect on the activation energy, suggesting that the unbinding of the ligand occurs after the transition state for quadruplex unfolding.
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影响因子:
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