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Divalent Cation Regulation of DNA-Brick Nanofiber Assembly and Stability
Yuqing Liu1,2,3, Jie Cheng1,2,3, Yue Wang4
1CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
ACS Applied Bio Materials
|April 7, 2026
Summary
Divalent cations like magnesium (Mg2+), calcium (Ca2+), and manganese (Mn2+) significantly impact DNA nanostructures. Understanding these effects is crucial for developing stable DNA-based devices in real-world conditions.
Area of Science:
- Nanotechnology
- Biochemistry
- Materials Science
Background:
- DNA nanotechnology often relies on controlled magnesium (Mg2+) environments.
- Real-world applications require DNA nanostructures to maintain integrity in diverse ionic conditions.
Purpose of the Study:
- To investigate the effects of extra divalent cations (Mg2+, Ca2+, Mn2+) on DNA-brick nanofiber assembly and stability.
- To understand how cation properties influence DNA nanostructure formation and resilience.
Main Methods:
- Studied the assembly and stability of DNA-brick nanofibers.
- Introduced varying concentrations of Mg2+, Ca2+, and Mn2+.
- Analyzed fiber bending profiles and structural integrity.
Main Results:
- Mg2+ promotes assembly but can cause aggregation and hysteresis at higher concentrations.
- Ca2+ leads to progressive structural degradation.
- Mn2+ inhibits assembly through nucleobase coordination.
- Individual fiber bending remained unaffected by cation type.
Conclusions:
- Divalent cation choice critically influences DNA nanostructure assembly pathways and stability.
- Ionic radius, hydration, and coordination properties are key factors modulating DNA nanostructure behavior.
- Findings are vital for designing robust DNA nanodevices for practical applications.
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