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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

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Scalable One-Pot-Liquid-Phase Oligonucleotide Synthesis for Model Network Hydrogels.

Guido Creusen^1,2,3, Cecilia Oluwadunsin Akintayo^1,2,3,4, Katja Schumann¹

¹A3BMS Lab, Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Strasse 31, 79104 Freiburg, Germany.

Journal of the American Chemical Society

|September 9, 2020

Summary

We developed a novel one-pot liquid-phase DNA synthesis method for scalable oligonucleotide production. This technique overcomes limitations of solid-phase synthesis and enables new DNA-based materials with tunable properties.

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Area of Science:

Organic Chemistry
Polymer Chemistry
Biotechnology

Background:

Solid-phase oligonucleotide synthesis (SPOS) is standard but faces scalability and reagent challenges.
Existing liquid-phase oligonucleotide synthesis (LPOS) is inefficient with multiple steps and acid-induced DNA degradation.

Purpose of the Study:

To introduce a scalable, one-pot liquid-phase DNA synthesis technique.
To address limitations of current oligonucleotide synthesis methods, including adenine-rich sequence degradation.

Main Methods:

Developed a one-pot LPOS protocol with sequential coupling, oxidation, and deprotection, followed by a single precipitation step.
Implemented a method to prevent depurination during adenine nucleotide addition.
Synthesized multigram quantities of 4-arm PEG-DNA building blocks.

Main Results:

Achieved high-purity 4-arm PEG-T20 and 4-arm PEG-A20 building blocks.
Demonstrated reversible self-assembly of PEG-DNA blocks into model network hydrogels.
Characterized enhanced mechanical properties and bond lifetimes in DNA-based hydrogels at room temperature.

Conclusions:

The one-pot LPOS method offers a scalable and efficient alternative to SPOS.
The synthesized PEG-DNA building blocks enable the creation of advanced supramolecular materials.
This work paves the way for next-generation DNA materials with macroscale applications.