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浙江大学学报（理学版）
浙江大学学报（理学版）  2016, Vol. 43 Issue (6): 740-745    DOI: 10.3785/j.issn.1008-9497.2016.06.020
物理学     
半柔性大分子链穿越微孔行为的研究
马源穗, 李小毛, 李萍, 杨志勇
江西农业大学 物理系, 江西 南昌 330045
Study on the behavior of semiflexible polymer translocating into spherical cavity through the nanopore
MA Yuansui, LI Xiaomao, LI Ping, YANG Zhiyong
Department of Physics, Jiangxi Agriculture University, Nanchang 330045, China
 全文: PDF(797 KB)  
摘要： 采用动态蒙特卡罗模拟方法，模拟半柔性大分子链在电场作用下穿越纳米孔道进入球腔的输运过程. 主要研究电场强度及半柔性大分子链的刚性强度对穿孔过程的影响.发现：平均穿孔时间τ随电场强度的增大而减小，τ与链的长度N满足标度关系τ~Nα，并且电场强度E和弯曲能b对标度指数有显著影响. 研究结果表明，当电场强度为中等时，刚性弱和刚性强的大分子的穿孔过程是完全不同的. 研究半柔性大分子链穿越微孔的行为，有助于更深入认识生物大分子在生命体内的输运过程.
关键词： 动态蒙特卡罗模拟;  半柔性大分子链;  穿孔;  标度行为    
Abstract: The translocation of biomacromolecule(such as protein, RNA/DNA) through channels or nanopores is very important in many biological processes. The semiflexible polymer model can characterize one of the main traits of biomacromolecule: rigidity. Therefore, semiflexible polymer can be used to simulate the biomacromolecule translocation across the nanopore. A semiflexible polymer driven to translocate through the nanopore into spherical cavity is investigated by dynamic Monte Carlo simulation based on three dimensional off-lattice model. This paper focuses on the effect of electric field strength E and bending energy b of semiflexible polymer on the translocation process. It is found that the average translocation time decreases with the increasing E for different b, and τ and N satisfy the relation: τ~Nα. In addition, E and b have obvious influence on the scaling exponent. It also shows that the translocation process is changing with the different b in the regime of moderate electric field strength. Our study on the semiflexible polymer's translocation across a nanopore is helpful to understanding the translocation process of bio-macromolecule in biological body.
Key words: dynamic Monte Carlo    semiflexible polymer    translocation through a nanopore    scaling behavior
收稿日期: 2015-09-06 出版日期: 2017-03-07
CLC:  O631  
基金资助: 国家自然科学基金资助项目(21304039).
通讯作者: 杨志勇,ORCID:http://orcid.org/0000-0003-4506-3956,E-mail:zhiyongyang2009@163.com     E-mail: zhiyongyang2009@163.com
作者简介: 马源穗(1992-),ORCID:http://orcid.org/0000-0003-4506-3956,女,硕士研究生,主要从事生物大分子的输运研究.
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引用本文:

马源穗, 李小毛, 李萍, 杨志勇. 半柔性大分子链穿越微孔行为的研究[J]. 浙江大学学报（理学版）, 2016, 43(6): 740-745.

MA Yuansui, LI Xiaomao, LI Ping, YANG Zhiyong. Study on the behavior of semiflexible polymer translocating into spherical cavity through the nanopore. Journal of ZheJIang University(Science Edition), 2016, 43(6): 740-745.

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https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2016.06.020    或    https://www.zjujournals.com/sci/CN/Y2016/V43/I6/740

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