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Updated: Jun 11, 2025
08:48
Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
Published on: October 13, 2011
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Chain stretching in brushes favors sequence recognition for nucleobase-functionalized flexible precise oligomers
Kseniia Grafskaia1, Qian Qin1, Jie Li1
1Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Croix du Sud 1 L7.04.02, Louvain-la-Neuve, Belgium. karine.glinel@uclouvain.be.
Soft Matter
|October 10, 2024
Summary
Flexible nucleobase oligomers show unspecific binding due to backbone flexibility. However, increasing grafting density on surfaces enhances sequence-specific binding by preserving positional information.
Area of Science:
- Polymer Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Nucleobase-functionalized oligomers are explored for molecular recognition.
- Oligomer flexibility can impact sequence-specific interactions.
- Controlling self-assembly is crucial for functional materials.
Purpose of the Study:
- To synthesize flexible oligo(triazole-urethane)s with nucleobase sequences.
- To investigate the impact of chain flexibility and grafting density on specific complexation.
- To understand factors governing molecular recognition in synthetic oligomers.
Main Methods:
- Synthesis of flexible stereocontrolled oligo(triazole-urethane)s.
- Molecular dynamics simulations of oligomer complexation.
- Irreversible adsorption studies on grafted oligomer layers (mushroom and brush configurations).
Main Results:
- Flexible backbones lead to unspecific oligomer complexation, irrespective of sequence complementarity.
- Grafting oligomers in a dense brush configuration significantly enhances sequence-specific binding.
- Optimal grafting density balances specificity and binding efficiency, avoiding penetration issues.
Conclusions:
- Chain flexibility generally hinders specific complexation in nucleobase oligomers.
- Tuning grafting density of target oligomers on substrates is key to improving specificity.
- This work provides insights for designing sequence-specific synthetic materials.
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