Abstract

Conformational dynamics and observed equilibrium constants for ligand binding of the adenine-specific riboswitch (add-A riboswitch) in the absence of Mg(2+) and presence of various concentrations of poly-ethylene glycol having an average molecular weight of 200 indicated that 54.2 water molecules were released from P2 and P3 stem regions of the add-A riboswitch during conformational transition upon the binding of 2-aminopurine, an analog of the natural ligand adenine.

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