Fluorescent structural DNA nanoballs functionalized with phosphate-linked nucleotide triphosphates

Area of Science:

• Biotechnology
• Nanotechnology
• Molecular Biology

Background:

• DNA polymerase requires nucleotide triphosphates (dNTPs) for DNA synthesis.
• Efficient delivery of dNTPs is crucial for various molecular biology applications.
• Current dNTP delivery methods may have limitations in stability or controlled release.

Purpose of the Study:

• To develop a novel, highly labeled DNA nanoball system as a dNTP source.
• To functionalize DNA nanoballs with phosphate-linked dNTPs for DNA polymerase activity.
• To characterize the physical and fluorescent properties of the developed nanoballs.

Main Methods:

• Preparation of DNA nanoballs via strand-displacement polymerization from a self-complementary circular template.
• Functionalization of nanoballs with phosphate-linked nucleotide triphosphates (dNTPs).
• Characterization using atomic force microscopy (AFM) and total internal reflection fluorescence (TIRF) microscopy.

Main Results:

• DNA nanoballs functionalized with dNTPs were successfully synthesized.
• AFM imaging revealed particles as condensed fuzzy balls (50-150 nm diameter).
• High fluorescent signal detected with a signal-to-noise ratio of 25 in 2 ms exposures using TIRF microscopy.

Conclusions:

• Developed DNA nanoballs serve as an effective, highly labeled dNTP source.
• The nanoball system demonstrates potential for enhanced dNTP delivery in biological assays.
• The bright fluorescence and rapid detection capabilities open avenues for high-throughput screening and imaging.