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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

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Reversible strain-promoted DNA polymerization.

Zhenyu Han1, Oliver G Hayes1, Benjamin E Partridge1

  • 1Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.

Science Advances
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed reversible, strain-promoted DNA polymerization. Removing strain triggers depolymerization and cyclic dimer recovery, enabling DNA materials with shape-memory and self-healing properties.

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Area of Science:

  • Biochemistry
  • Materials Science
  • Synthetic Biology

Background:

  • Introducing molecular strain influences chemical reactions.
  • Reversing strain-promoted reactions after thermodynamic product formation is difficult.

Purpose of the Study:

  • To report a reversible, strain-promoted polymerization process in cyclic DNA.
  • To demonstrate DNA's utility as a programmable ligand and for creating restorable bonds.

Main Methods:

  • Utilized nonhybridizing, single-stranded DNA spacers for cyclization.
  • Generated molecular strain by duplexing spacers, inducing ring opening and polymerization.
  • Triggered depolymerization by removing strain-generating duplexers.

Main Results:

  • Achieved reversible DNA polymerization and depolymerization.
  • Demonstrated strain removal leads to enthalpy-driven cyclization and entropy-mediated ring contraction for dimer recovery.
  • Maintained reversibility with conjugated proteins, modulating assembly valency.

Conclusions:

  • Developed a novel DNA-based system for reversible polymerization.
  • Established a molecular basis for DNA materials with shape-memory, self-healing, and stimuli-responsive characteristics.