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Updated: Aug 5, 2026
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Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes
Published on: July 6, 2016
Sequence-Directed Control of Cyanine Dye Stacking Geometry within DNA Duplexes
Ya Wang1, Nan Cui1, Weina Fang1
1Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University, Dongchuan Road 500, Shanghai 200241, China.
JACS Au
|July 30, 2026
Summary
DNA sequence dictates how cyanine dyes stack, influencing their optical properties. This discovery offers a new method for designing advanced nanomaterials by controlling molecular arrangements.
Area of Science:
- Supramolecular Chemistry
- DNA Nanotechnology
- Materials Science
Background:
- Dye aggregate photophysics depend on supramolecular stacking (H- and J-type).
- DNA nanotechnology precisely organizes chromophores, but sequence-specific dye stacking is unclear.
Purpose of the Study:
- Investigate how DNA nearest-neighbor base-pair sequences regulate cyanine dye dimer stacking geometry.
- Determine if DNA sequence acts as a regulator for dye arrangement.
Main Methods:
- Covalently tethered cyanine dyes (Cy5 and Cy3) within DNA duplexes.
- Systematic variation of local base-pair sequences adjacent to dyes.
- Analysis of stacking geometries (H-type, J-type, oblique).
Main Results:
- Cy5 dimers: C/G neighbors favor H-type stacking; A/T promote J-type; C/T promote oblique.
- Cy3 dimers: Predominantly J-type stacking regardless of sequence context.
- Demonstrated dye-dependent selectivity in sequence-controlled stacking.
Conclusions:
- DNA acts as an active, sequence-dependent microenvironment, not just a scaffold.
- Nearest-neighbor base-pair variation precisely modulates supramolecular order.
- Provides a predictive strategy for engineering tunable excitonic nanomaterials.
