Experimental Measurement of Surface Charge Effects on the Stability of a Surface-Bound Biopolymer.
Experimental Measurement of Surface Charge Effects on the Stability of a Surface-Bound Biopolymer.
复制标题
表面电荷对表面结合生物聚合物稳定性影响的实验测量。
DOI:
10.1021/acs.langmuir.8b01004
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Plaxco,KevinW
中科院分区:
文献类型:
--
作者:
Watkins,HerschelM;Ricci,Francesco;Plaxco,KevinW
Quantitative experimental studies of the thermodynamics with which biopolymers interact with specific surfaces remain quite limited. In response, here we describe experimental and theoretical studies of the change in folding free energy that occurs when a simple biopolymer, a DNA stem-loop, is site-specifically attached to a range of chemically distinct surfaces generated via self-assembled monolayer formation on a gold electrode. Not surprisingly, the extent to which surface attachment alters the biopolymer’s folding free energy depends strongly on the charge of the surface, with increasingly negatively charged surfaces leading to increased destabilization. A simple model that considers only the excluded volume and electrostatic repulsion generated by the surface and models the ionic environment above the surface as a continuum quantitatively recovers the observed free energy change associated with attachment to weakly charged negative surfaces. For more strongly charged negative surfaces a model taking into account the discrete size of the involved ions is required. Our studies thus highlight the important role that electrostatics can play in the physics of surface–biomolecule interactions.
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影响因子:
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DOI:
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发表时间:
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期刊:
影响因子:
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