首页|Theoretical study of the nonlinear force-loading control in single-molecule stretching experiments
Theoretical study of the nonlinear force-loading control in single-molecule stretching experiments
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Force spectrum measurements with constant loading rates are widely used in single-molecule manipulation experiments to study the mechanical stability and force response of biomolecules.Force-dependent transition rates can be obtained from the transition force distribution,but it is limited to the force range with non-zero force distribution.Although constant loading rate control can be realized with magnetic tweezers,the loading rate range is limited due to the slow movement of permanent magnets.Non-linear exponential and exponential squared force loading functions are more feasible in magnetic tweezers,while there is no theoretical result available for these two kinds of non-linear force loading functions.In this study,we solved the unfolding process of a protein following Bell's model under nonlinear exponential and exponential squared force loading functions,which offer a broader range of unfolding force distribution compared to the traditional constant loading rate experiments.Furthermore,we derived two force loading functions,which can produce uniform unfolding force distribution.This research contributes fundamental equations for the analysis of experimental data obtained through single-molecule manipulation under nonlinear force loading controls,paving the way for the use of nonlinear force control in magnetic tweezer experiments.
single-molecule manipulationmagnetic tweezersforce loadingtransition ratesforce distribution
Xingyu Qi、Zilong Guo、Shimin Le、Hu Chen
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Research Institute for Biomimetics and Soft Matter,Fujian Provincial Key Lab for Soft Functional Materials Research,Department of Physics,Xiamen University,Xiamen 361005,China
Center of Biomedical Physics,Wenzhou Institute,University of Chinese Academy of Sciences,Wenzhou 325000,China
国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金高等学校学科创新引智计划(111计划)Research Fund of Wenzhou Institute
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