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Nucleic Acid Structure

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA has a double-helix structure. The...

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Preparation of Carbon Nanosheets at Room Temperature

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Published on: March 8, 2016

Two-Dimensional Nucleic Acid Brushes on Colloidal MXene Sheets.

Jiyoung Lee^1,2,3, Jaeeun Yoon^1,2,4, Ki Hong Park¹

¹Extreme Materials Research Center, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea.

|December 12, 2025

Summary

This summary is machine-generated.

Researchers developed a novel method to attach DNA to 2D MXene materials, creating advanced DNA brushes. This breakthrough enables new possibilities for gene sensing and intracellular delivery applications.

Keywords:

DNA conjugation MXene Self-assembly Surface chemistry Surface functionalization Two-dimensional material

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Area of Science:

Materials Science
Nanotechnology
Biotechnology

Background:

DNA immobilization on nanoparticles is crucial for applications like gene sensing and intracellular delivery.
Functionalizing atomically thin 2D materials, especially their inert basal planes, for dense DNA attachment remains a significant challenge.
Two-dimensional transition metal carbides (MXenes) offer a chemically active surface ideal for biofunctionalization due to polar terminations.

Purpose of the Study:

To develop a robust method for DNA grafting onto 2D MXene surfaces.
To create a high-density two-dimensional (2D) DNA brush structure.
To establish a versatile platform for bioactive nanobrush applications in nanoscience and biotechnology.

Main Methods:

Designing a bifunctional ligand with catechol and azide groups for MXene surface anchoring and DNA conjugation.
Utilizing strain-promoted cycloaddition between azide and dibenzocyclooctyne (DBCO) functional groups for DNA attachment.
Characterizing the DNA brush via sequence-controlled self-assembly of MXene flakes and heteroassembly with gold nanoparticles.

Main Results:

Achieved robust DNA grafting onto MXene surfaces with high density.
Demonstrated sequence-controlled self-assembly of DNA-functionalized MXene flakes.
Successfully achieved heteroassembly between DNA-MXene brushes and complementary gold nanoparticles, confirming the structure's integrity and programmability.

Conclusions:

Presented a simple and effective strategy for creating colloidal two-dimensional nucleic acid brushes.
Established MXenes as a versatile platform for dense DNA functionalization.
Paved the way for exploring advanced bioactive nanobrush structures in nanoscience and biotechnology.