Abstract
RNAs that contain specific high-affinity binding sites for small molecule ligands immobilized on a solid support are present at a frequency of roughly one in 1010-1011 in pools of random sequence RNA molecules1,2. Here we describe a new in vitro selection procedure designed to ensure the isolation of RNAs that bind the ligand of interest in solution as well as on a solid support. We have used this method to isolate a remarkably small RNA motif that binds ATP, a substrate in numerous biological reactions and the universal biological high-energy intermediate. The selected ATP-binding RNAs contain a consensus sequence, embedded in a common secondary structure. The binding properties of ATP analogues and modified RNAs show that the binding interaction is characterized by a large number of close contacts between the ATP and RNA, and by a change in the conformation of the RNA.
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Sassanfar, M., Szostak, J. An RNA motif that binds ATP. Nature 364, 550–553 (1993). https://doi.org/10.1038/364550a0
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DOI: https://doi.org/10.1038/364550a0
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