炭素ドットと核酸の相互作用は表面電荷によって駆動される

科学分野:

• Nanomaterials science
• Biophysics
• Computational chemistry

背景:

• Carbon dots (CDs) are versatile nanomaterials with potential in biomedical applications, including theranostics.
• Understanding carbon dot interactions with biomolecules like nucleic acids (NAs) is crucial for safe and effective use.
• Nucleic acids are fundamental to cellular processes, including gene regulation and chromatin organization.

研究 の 目的:

• To investigate the atomistic interactions between carbon dots (CDs) and various nucleic acid (NA) structures.
• To determine how CD properties, such as size and surface charge, influence NA binding and structural integrity.
• To provide guidance for designing carbon dots for NA-related theranostic applications.

主な方法:

• Atomistic molecular dynamics simulations exceeding 150 μs.
• Simulation of diverse NA structures: DNA/RNA helices, tetraloops, G-quadruplexes, and nucleosomes.
• Modeling interactions with graphitic carbon dots of varying sizes and surface chemistries (neutral, negative, positive).

主要な成果:

• All simulated carbon dot types interacted with nucleic acids through nonspecific binding modes.
• Only positively charged carbon dots (CD+) demonstrated sustained binding to nucleic acids.
• Carbon dot binding did not disrupt global NA architecture, including base pairing or intercalation.
• CD+ adsorption onto nucleosomal DNA may influence local chromatin dynamics.

結論:

• Surface charge and particle size are critical determinants of carbon dot-nucleic acid interactions.
• Positively charged carbon dots are suitable candidates for nucleic acid-targeted theranostic applications.
• Atomistic insights guide the rational design of carbon dots for optimized biomedical performance.