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Updated: May 4, 2026

Synthesis of Wavelength-shifting DNA Hybridization Probes by Using Photostable Cyanine Dyes

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Published on: July 6, 2016

Control of Indodicarbocyanine Dimer Geometry Using Variable-Length Linkers to DNA Scaffolds.

Adam A Meares¹, Sara R Ansteatt², Sebastián A Díaz¹

¹Center for Biomolecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, District of Columbia 20375, United States.

Journal of the American Chemical Society

|August 2, 2025

Summary

This summary is machine-generated.

Modifying the linker length between DNA-bound dyes controls their orientation and packing. Shorter linkers promote J-like dye aggregates, while longer linkers yield H-like aggregates, improving control over optical properties.

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Area of Science:

Supramolecular chemistry
Biophysics
Materials science

Background:

DNA scaffolds enable precise organization of dye molecules for tailored optical properties.
Controlling dye relative orientation within DNA-templated aggregates remains a significant challenge.

Purpose of the Study:

To investigate the effect of linker length between indodicarbocyanine (Cy5) dyes and DNA templates on aggregate geometry.
To determine if linker length can control dye-DNA aggregate structure and optical properties.

Main Methods:

Synthesis of Cy5 dyes with varying linker lengths (2-carbon and 4-carbon).
Experimental spectroscopy to analyze optical properties.
Theoretical modeling and molecular dynamics simulations to understand aggregate structure.

Main Results:

Shortening the linker to 2-carbon limited dye π-π interactions, favoring J-like Cy5 dimers.
Increasing linker length to 4-carbon allowed more freedom, promoting H-like Cy5 dimers.
Shorter linkers suppressed packing heterogeneity by restricting dye accessible volume.

Conclusions:

Dye linker chemistry is crucial for determining optical and photophysical properties of DNA-scaffolded dye aggregates.
Tuning linker length is an effective strategy to control dye aggregate geometry and reduce packing heterogeneity for photonics applications.