期刊
NANO LETTERS
卷 15, 期 1, 页码 732-737出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl504375c
关键词
Nanopore; DNA; velocity; translocation; DNA origami
类别
资金
- Netherlands Organisation for Scientific Research (NWO/OCW), as part of the Frontiers of Nanoscience program
- European Research Council under Research Grant NanoforBio [247072]
While understanding translocation of DNA through a solid-state nanopore is vital for exploiting its potential for sensing and sequencing at the single-molecule level, surprisingly little is known about the dynamics of the propagation of DNA through the nanopore. Here we use linear double-stranded DNA molecules, assembled by the DNA origami technique, with markers at known positions in order to determine for the first time the local velocity of different segments along the length of the molecule. We observe large intramolecular velocity fluctuations, likely related to changes in the drag force as the DNA blob unfolds. Furthermore, we observe an increase in the local translocation velocity toward the end of the translocation process, consistent with a speeding up due to unfolding of the last part of the DNA blob. We use the velocity profile to estimate the uncertainty in determining the position of a feature along the DNA given its temporal location and demonstrate the error introduced by assuming a constant translocation velocity.
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