Rationally designed nucleobase and nucleotide coordinated nanoparticles for selective DNA adsorption and detection

Area of Science:

• Biomaterials Science
• Nanotechnology
• Molecular Biology

Background:

• Current DNA adsorption nanomaterials lack sequence specificity, relying on non-specific interactions like electrostatic attraction.
• Achieving sequence-specific DNA detection requires methods that exploit specific molecular interactions, such as hydrogen bonding and metal coordination.

Purpose of the Study:

• To develop and characterize novel nucleobase/nucleotide-coordinated nanomaterials for sequence-specific DNA adsorption.
• To investigate the role of metal ions and surface charge in DNA adsorption kinetics and specificity.
• To evaluate the potential of these nanomaterials for DNA detection sensors and intracellular delivery.

Main Methods:

• Synthesis of diverse nucleobase/nucleotide-coordinated materials with various metal ions (Au(III), Ag(I), Ce(III), Gd(III), Tb(III)).
• Characterization of nanoparticle formation and surface charge.
• Analysis of DNA adsorption kinetics for different sequences on negatively charged materials.
• Assessment of adsorption strength influenced by metal ions.
• Evaluation of materials for DNA sensing and cellular delivery.

Main Results:

• Nanoparticles were formed, with varying surface charges influencing DNA adsorption.
• Negatively charged materials exhibited sequence-dependent adsorption kinetics, favoring complementary DNA homopolymers.
• Adsorption strength was primarily dictated by the metal ion, with gold showing the strongest interaction.
• Materials demonstrated potential for DNA detection sensors and non-toxic intracellular DNA delivery.

Conclusions:

• Metal-coordinated nanomaterials offer a pathway to sequence-specific DNA adsorption and detection.
• The rational design of these materials, considering metal ions and surface properties, is crucial for optimizing biomolecular interactions.
• These findings represent a significant advancement in developing advanced nanomaterials for biosensing and biomedical applications.