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An enzyme-powered, three-dimensional lame DNA walker.

Jie Fang1, Changjing Yuan2, Junjie Li3

  • 1Department of Laboratory Medicine, Southwest Hospital, Army Medical University (Third Military Medical University), Chongqing, 400038, China; Key Laboratory of Laboratory Medical Diagnostics, Ministry of Education, Department of Laboratory Medicine, Chongqing Medical University, Chongqing, 400016, China.

Biosensors & Bioelectronics
|January 18, 2021
PubMed
Summary

Researchers developed a novel DNA walker for autonomous movement on 3D tracks. This molecular machine demonstrates efficient DNA detection, advancing DNA walking systems for biosensors and beyond.

Keywords:
BiosensorLame DNA walkerMicrosphereNicking endonuclease

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Nanotechnology

Background:

  • Three-dimensional (3-D) DNA walkers are emerging as key components for advanced applications like biosensors and drug delivery.
  • Autonomous molecular machines offer precise control and novel functionalities in nanoscale engineering.

Purpose of the Study:

  • To introduce a novel, autonomously moving DNA walker capable of operating on a microsphere-based 3-D track.
  • To characterize the kinetic and persistent movement properties of this new DNA walker.
  • To evaluate its potential for specific DNA detection.

Main Methods:

  • Design and construction of a 'lame' DNA walker with distinct long and short legs for movement and substrate cleavage.
  • Utilizing nicking endonuclease for propulsion along hybridized DNA tracks on a 3-D scaffold.
  • Kinetic studies to determine reaction equilibrium times and movement rates.
  • Demonstration of target DNA detection using a toehold exchange mechanism.

Main Results:

  • The lame DNA walker achieves reaction equilibrium within 30 minutes.
  • Persistent movement on 3-D tracks was observed at an average rate of 6.467 × 10-11 M s-1.
  • High specificity in detecting target DNA within the range of 10 pM-5 nM was achieved.

Conclusions:

  • The developed lame DNA walker represents a significant advancement in 3-D DNA walking systems.
  • This molecular machine shows promise for applications in highly specific biosensing.
  • The study enhances the understanding of DNA walking mechanisms and their potential applications.