Quantized biopolymer translocation through nanopores: Departure from simple scaling

被引:7
作者
Melchionna, Simone [1 ,2 ,3 ]
Bernaschi, Massimo [4 ]
Fyta, Maria [1 ,2 ]
Kaxiras, Efthimios [1 ,2 ]
Succi, Sauro [4 ]
机构
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[3] Univ Roma La Sapienza, Dept Phys, INFM SOFT, I-00185 Rome, Italy
[4] CNR, Ist Appl Calcolo, I-00161 Rome, Italy
来源
PHYSICAL REVIEW E | 2009年 / 79卷 / 03期
关键词
DNA; molecular biophysics; molecular dynamics method; nanoporous materials; polymers; SOLID-STATE NANOPORE; POLYNUCLEOTIDE MOLECULES; DNA TRANSLOCATION;
D O I
10.1103/PhysRevE.79.030901
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We discuss multiscale simulations of long biopolymer translocation through wide nanopores that can accommodate multiple polymer strands. The simulations provide clear evidence of folding quantization, namely the translocation proceeds through multifolded configurations characterized by a well-defined integer number of folds. As a consequence, the translocation time acquires a dependence on the average folding number, which results in a deviation from the single-exponent power law characterizing single-file translocation through narrow pores. The mechanism of folding quantization allows polymers above a threshold length (approximately 1000 persistence lengths for double-stranded DNA) to exhibit cooperative behavior, and as a result to translocate noticeably faster.
引用
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页数:4
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