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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
Published on: October 25, 2017
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Statistical analysis of molecular nanotemplate driven DNA adsorption on graphite
E V Dubrovin1, S Speller, I V Yaminsky
1Chair of Physics of Polymers and Crystals, Faculty of Physics, M. V. Lomonosov Moscow State University , Leninskie gory, 1/2, Moscow 119991, Russia.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 4, 2014
Summary
DNA conformation on nanotemplates depends on surface interactions. Atomic force microscopy reveals DNA forms straight segments on amine and alcohol templates, adopting compact or relaxed 2D shapes, while stearic acid results in rigid rod-like structures.
Area of Science:
- Biophysics
- Materials Science
- Nanotechnology
Background:
- DNA conformation is crucial for its biological functions.
- Surface properties significantly influence DNA adsorption and structure.
- Understanding DNA-nanotemplate interactions is key for nanoscale applications.
Purpose of the Study:
- To investigate DNA molecule conformation on various nanotemplates.
- To analyze the impact of different functional groups on DNA structure.
- To characterize DNA-surface interactions at the nanoscale.
Main Methods:
- Atomic Force Microscopy (AFM) for imaging DNA.
- Wormlike chain model for analyzing polymer fluctuations.
- Scaling exponent analysis to determine polymer conformation.
Main Results:
- DNA forms straight segments on octadecylamine and stearyl alcohol nanotemplates, ordering along graphite axes.
- On large length scales, DNA adopts 2D compact or partially relaxed conformations.
- On short length scales and on stearic acid, DNA exhibits rigid rod-like conformations.
- Persistence length of λ-DNA on octadecylamine decreases, indicating reduced rigidity independent of DNA length.
Conclusions:
- DNA conformation is dictated by the functional group of the nanotemplate (amine, alcohol, acid).
- DNA-surface interactions alter DNA rigidity, with a notable decrease in persistence length.
- The observed changes in DNA rigidity are independent of the biopolymer's length.
