Accessibility navigation


Stabilization of the i-motif structure by the intra-strand cross-link formation

Kikuta, K., Piao, H., Brazier, J., Taniguchi, Y., Onizuka, K., Nagatsugi, F. and Sasaki, S. (2015) Stabilization of the i-motif structure by the intra-strand cross-link formation. Bioorganic & Medicinal Chemistry Letters, 25 (16). pp. 3307-3310. ISSN 0960-894X

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1016/j.bmcl.2015.05.064

Abstract/Summary

The i-motif structures are formed by oligonucleotides containing cytosine tracts under acidic conditions. The folding of the i-motif under physiological conditions is of great interest because of its biological role. In this study, we investigated the effect of the intra-strand cross-link on the stability of the i-motif structure. The 4-vinyl-substituted analog of thymidine (T-vinyl) was incorporated into the 5′-end of the human telomere complementary strand, which formed the intra-strand cross-link with the internal adenine. The intra-strand cross-linked i-motif displayed CD spectra similar to that of the natural i-motif at acidic pH, which was transformed into a random coil with the increasing pH. The pH midpoint for the transition from the i-motif to random coil increased from pH 6.1 for the natural one to pH 6.8 for the cross-linked one. The thermodynamic parameters were obtained by measuring the thermal melting behaviors by CD and UV, and it was determined that the intra-strand cross-linked i-motif is stabilized due to a favorable entropy effect. Thus, this study has clearly indicated the validity of the intra-strand cross-linking for stabilization of the i-motif structure.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > School of Pharmacy > Medicinal Chemistry Research Group
ID Code:40717
Publisher:Elsevier

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation