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Langmuir 2015: Effects of Water on the Single-chain Elasticity of poly(U) RNA  
Langmuir 2015: Effects of Water on the Single-chain Elasticity of poly(U) RNA
資料類型: PDF文件
關(guān)鍵詞: RNA  
資料大?。?/td> 904k
所屬學(xué)科: 高分子物理
來源: 來源網(wǎng)絡(luò)
簡(jiǎn)介:
Water, the dominant component in the physiological condition, is a complicated solvent, which greatly affects the properties of solute molecules. Here, we utilize atomic force microscope-based single-molecule force spectroscopy to study the influence of water on the single-molecule elasticity of an unstructured single-stranded RNA (poly(U)). In nonpolar solvents, RNA presents its inherent elasticity, which is consistent with the theoretical single-chain elasticity calculated by quantum mechanics calculations. In aqueous buffers, however, an additional energy of 1.9 kJ/mol?base is needed for the stretching of the ssRNA chain. This energy is consumed by bound water rearrangement (Ew) during the chain elongation. Further experimental results indicate that the Ew value is uncorrelated to the salt concentrations and stretching velocity. The results obtained in an 8 M guanidine?HCl solution provide more evidence that the bound water molecules around RNA give rise to the observed deviation between aqueous and nonaqueous environments. Compared with synthetic water-soluble polymers, the value of Ew of RNA is much lower. The weak interference of water is supposed to be the precondition for the RNA secondary structure to exist in aqueous solution.
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上傳時(shí)間: 2015-06-15 17:29:15
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