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2020-11-13

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cc-by-nc-nd (c) Elsevier B.V., 2020
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/173308

Study of alkaloid berberine and its interaction with the human telomeric i-motif DNA structure

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https://doi.org/10.1016/j.saa.2020.119185

Abstract

The alkaloid berberine presents many biological activities related to its potential to bind DNA structures, such as duplex or G-quadruplex. Recently, it has been proposed that berberine may interact with i-motif structures formed from the folding of cytosine-rich sequences. In the present work, the interaction of this alkaloid with the i-motif formed by the human telomere cytosine-rich sequence, as well as with several positive and negative controls, has been studied. Molecular fluorescence and circular dichroism spectroscopies, as well as nuclear magnetic resonance spectrometry and competitive dialysis, have been used with this purpose. The results shown here reveal that the interaction of berberine with this i-motif is weak, mostly electrostatics in nature and takes place with bases not involved in C·C+ base pairs. Moreover, this ligand is not selective for i-motif structures, as binds equally to both, folded structure, and unfolded strand, without producing any stabilization of the i-motif. As a conclusion, the development of analytical methods based on the interaction of fluorescent ligands, such as berberine, with i-motif structures should consider the thermodynamic aspects related with the interaction, as well as the selectivity of the proposed ligands with different DNA structures, including unfolded strands.

Subject

G-estructures, ADN, Alcaloides

Subject (English)

G-structures, DNA, Alkaloids

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Articles publicats en revistes (Enginyeria Química i Química Analítica)

Citation

GARGALLO GÓMEZ, Raimundo, et al. Study of alkaloid berberine and its interaction with the human telomeric i-motif DNA structure. Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy. 2020. Vol. 248, num. 119185. ISSN 1386-1425. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/173308

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