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- W2039173614 abstract "The binding affinity, energetics and conformational aspects of the interaction of isoquinoline alkaloids berberine and palmatine to four single stranded polyribonucleotides polyguanylic acid [poly(G)], polyinosinic acid [poly(I)], polycytidylic acid [poly(C)] and polyuridylic acid [poly(U)] were studied by absorption, fluorescence, isothermal titration calorimetry and circular dichroism spectroscopy and compared with ethidium. Berberine, palmatine and ethidium binds strongly with poly(G) and poly(I) with affinity in the order 105 M−1 while their binding to poly(C) and poly(U) were very weak or practically nil. The same conclusions have also emerged from isothermal titration calorimetric studies. The binding of all the three compounds to poly(C) and poly(I) was exothermic and favored by both negative enthalpy change and positive entropy change. Conformational change in the polymer associated with the binding was observed in poly(I) with all the three molecules and poly(U) with ethidium but not in poly(G) and poly(C) revealing differences in the orientation of the bound molecules in the hitherto different helical organization of these polymers. These fundamental results may be useful and serve as database for the development of futuristic RNA based small molecule therapeutics." @default.
- W2039173614 created "2016-06-24" @default.
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- W2039173614 date "2008-03-01" @default.
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- W2039173614 title "RNA targeting by small molecule alkaloids: Studies on the binding of berberine and palmatine to polyribonucleotides and comparison to ethidium" @default.
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