Interaction of small molecules with double-stranded RNA: spectroscopic, viscometric, and calorimetric study of hoechst and proflavine binding to PolyCG structures.

Abstract:

:Design and synthesis of new small molecules binding to double-stranded RNA necessitate complete understanding of the molecular aspects of the binding of many existing molecules. Toward this goal, in this work we evaluated the biophysical aspects of the interaction of a DNA intercalator (proflavine) and a minor groove binder (hoechst 33258) with two polymorphic forms of polyCG, namely, the right-handed Watson-Crick base paired A-form and the left-handed Hoogsteen base paired H(L)-form, by absorption, fluorescence, and viscometry experiments. The energetics of the interaction of these molecules with the RNA structures has also been elucidated by isothermal titration calorimetry (ITC). Results suggest that proflavine strongly intercalates in both forms of polyCG, whereas hoechst shows mainly groove-binding modes. The binding of both drugs to both forms of RNA resulted in significant conformational change to the RNA structure with the bound molecules being placed in the chiral RNA helix. ITC profiles for both proflavine and hoechst show two binding sites. Binding of proflavine to both forms of RNA is endothermic and entropy driven in the first site and exothermic and enthalpy driven in the second site, whereas hoechst binding to both forms of RNA is exothermic and enthalpy driven in the first site and endothermic and entropy driven in the second site. This study suggests that the binding affinity characteristics and energetics of interaction of these DNA binding molecules with the RNA conformations are significantly different and may serve as data for future development of effective structure-selective RNA-based drugs.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

Sinha R,Hossain M,Kumar GS

doi

10.1089/dna.2008.0838

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

209-19

issue

4

eissn

1044-5498

issn

1557-7430

journal_volume

28

pub_type

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