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Published on: September 21, 2017
Ordered self-assembled locked nucleic acid (LNA) structures on gold(111) surface with enhanced single base mismatch
Sourav Mishra1, Srabani Ghosh, Rupa Mukhopadhyay
1Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 8, 2012
Summary
Locked nucleic acid (LNA) monolayers form ordered, bioactive surfaces on gold, significantly enhancing DNA detection signals and mismatch discrimination compared to DNA. This breakthrough offers improved biosensor technology.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Molecular Biology
Background:
- Locked nucleic acid (LNA) offers superior DNA/RNA detection and reduced surface interactions compared to DNA for biosensors.
- Developing ordered LNA monolayers on solid surfaces is crucial for advanced biosensor applications.
Purpose of the Study:
- To develop a straightforward method for creating ordered, bioactive LNA monolayers on gold surfaces.
- To characterize the self-assembly process and properties of LNA monolayers.
- To compare the performance of LNA-based biosensors with DNA-based ones.
Main Methods:
- Simple immersion method for LNA self-assembly on gold(111) surfaces.
- High-resolution atomic force microscopy (AFM) for imaging molecular ordering.
- Reflection absorption infrared (RAIR) spectroscopy for analyzing molecular orientation.
Main Results:
- Achieved ordered, bioactive LNA monolayers with well-defined 1D and 2D molecular arrangements.
- Demonstrated 4-4.5 times stronger DNA recognition signals compared to DNA.
- Showcased nearly twofold improved mismatch discrimination between complementary and single-base mismatch DNA targets.
- Observed an orientational transition of LNA molecules from 'lying down' to 'upright' within hours.
Conclusions:
- The simple immersion method effectively generates ordered, bioactive LNA monolayers on gold.
- LNA monolayers significantly enhance DNA detection sensitivity and specificity in biosensors.
- LNA's unique properties and self-assembly behavior pave the way for next-generation nucleic acid-based biosensor technologies.
