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Weakly bound water molecules shorten single-stranded DNA  
Weakly bound water molecules shorten single-stranded DNA
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关键词: DNA  single  molecule  
资料大小: 125k
所属学科: 高分子物理
来源: 来源网络
简介:
In this paper, we measure the single chain elasticity of an oligomer ssDNA in both aqueous and non-aqueous, apolar liquid environments by AFM-based single molecule force spectroscopy. We find a marked deviation between the force-extension relations recorded in the two ambients. This difference is attributed to the additional energy required to break the H-bond directed water bridges around ssDNA chain in aqueous solutions, which are non-existent in organic solvents. The results obtained in8Mguanidine-HCl solution provide another evidence that water bridges around ssDNA originate the observed deviation. Based on the results obtained by an ab-initio quantum mechanics calculation, a parameter-free freely-rotating-chain model is proposed. We find that this model is in a perfect agreement with the experimental force-extension curve obtained in organic solvents, which further corroborates our assumption. Based on the experimental results, it is suggested that the weak H-bonding between ssDNA and water molecules may be a precondition for a stable dsDNA to exist in water.
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