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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
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An Unprecedented Knot-like G-Quadruplex Peripheral Motif.
Thi Hong Anh Truong1, Fernaldo Richtia Winnerdy1, Anh Tuân Phan1,2
1School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Angewandte Chemie (International Ed. in English)
|July 19, 2019
Summary
Researchers discovered a novel knot-like DNA structure formed by the DL7 sequence. This G-quadruplex structure, with its unique folding, has potential applications in drug design and DNA engineering.
Area of Science:
- Structural biology
- Biochemistry
- Molecular biology
Background:
- G-quadruplexes are non-canonical DNA secondary structures implicated in various biological processes.
- Single-stranded DNA can adopt complex folding patterns beyond simple duplexes.
Purpose of the Study:
- To elucidate the solution NMR structure of a DNA oligonucleotide containing the DL7 sequence.
- To characterize the interaction between a G-quadruplex core and a novel peripheral knot-like structure.
Main Methods:
- Solution Nuclear Magnetic Resonance (NMR) spectroscopy was used to determine the three-dimensional structure.
- Analysis of a 24-nucleotide (nt) DNA oligonucleotide incorporating the DL7 sequence.
Main Results:
- A knot-like peripheral structure formed by the 7-nt DL7 DNA sequence was identified.
- This structure interacts with a two-layer anti-parallel G-quadruplex core, featuring two sharp turns in the DNA backbone.
- Demonstrated compatibility of the DL7 knot-like structure with various G-quadruplexes.
Conclusions:
- The novel structural element highlights intricate single-stranded DNA folding properties.
- The DL7 knot-like structure's compatibility suggests potential applications in drug design and DNA engineering.
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