Long-range electrostatic trapping of single-protein molecules at a liquid-solid interface

被引:156
作者
Xu, XHN
Yeung, ES [1 ]
机构
[1] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Chem, Ames, IA 50011 USA
关键词
D O I
10.1126/science.281.5383.1650
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The motion of single, dye-labeled protein molecules was monitored at various pH and ionic strengths within the 180-nanometer-thick evanescent-field layer at a fused-silica surface. Below the isoelectric point, molecules partitioning into the excitation region increased in number but maintained a random spatial distribution, implying that surface charge can influence the charged protein at. distances beyond that of the electrical double-layer thickness. The residence times of the molecules in the interfacial layer also increased below the isoelectric point. However, immobilization on the solid surface for extended periods was not observed. Histograms of residence times exhibit nearly identical asymmetry as the corresponding elution peaks in capillary electrophoresis. These results are a direct verification of the statistical theory of chromatography at the single-molecule level, with the caveat that Long-range trapping rather than adsorption is the dominant mechanism.
引用
收藏
页码:1650 / 1653
页数:4
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