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• W2896543408 abstract "Abstract The relative ease of isolating aptamers with high specificity for target molecules suggests that molecular recognition may be common in the folds of natural RNAs. We show here that, when expressed in cells, aptamers can increase the intracellular concentrations of their small molecule ligands. We have named these aptamers as DRAGINs ( D rug B inding A ptamers for G rowing I ntracellular N umbers). The DRAGIN property, assessed here by the ability to enhance the toxicity of their ligands, was found for some, but not all, aminoglycoside aptamers. One aptamer protected cells against killing by its ligand. Another aptamer promoted killing as a singlemer and protected against killing as a tandemer. Based on a mathematical model, cell protection vs. killing is proposed as governed by aptamer affinity and access to the inner surface of the cell membrane, with the latter being a critical determinant. With RNA molecules proposed as the earliest functional polymers to drive the evolution of life, we suggest that RNA aptamer-like structures present in primitive cells might have selectively concentrated precursors for polymer synthesis. Riboswitches may be the evolved forms of these ancient aptamer-like “nutrient procurers”. Aptamers with DRAGIN capability in the modern world could be applied for imaging cells, in synthetic cell constructs, or to draw drugs into cells to make “undruggable” targets accessible to small molecule inhibitors." @default.
• W2896543408 created "2018-10-26" @default.
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• W2896543408 date "2018-10-24" @default.
• W2896543408 modified "2023-09-26" @default.
• W2896543408 title "Aptamer-enabled uptake of small molecule ligands" @default.
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• W2896543408 doi "https://doi.org/10.1038/s41598-018-33887-w" @default.
• W2896543408 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6200808" @default.
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