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Multiple stepwise pattern for potential of mean force in unfolding the thrombin binding aptamer in complex with Sr2+
Changwon Yang1, Soonmin Jang, Youngshang Pak
1Department of Chemistry and Institute of Functional Materials, Pusan National University, Busan 609-735, South Korea.
The Journal of Chemical Physics
|December 16, 2011
Summary
This study reveals how strontium ions influence the unfolding of thrombin binding DNA aptamers (15-TBA) through molecular dynamics simulations. The findings detail the interplay of metal ions, guanine bases, and water molecules during DNA stretching.
Area of Science:
- Molecular Biophysics
- Computational Chemistry
- Structural Biology
Background:
- Thrombin binding DNA aptamers (15-TBA) are crucial in molecular recognition.
- Understanding DNA aptamer-metal ion interactions is vital for therapeutic applications.
Purpose of the Study:
- To quantitatively describe the unfolding process of 15-TBA in the presence of Sr(2+).
- To provide molecular-level insights into DNA aptamer structural changes driven by mechanical stretching.
Main Methods:
- All-atom molecular dynamics (MD) simulations.
- Umbrella sampling techniques.
- Potential of Mean Force (PMF) calculations.
Main Results:
- The unfolding free energy and force extension profiles of 15-TBA-Sr(2+) complex were determined.
- The PMF exhibited a multi-step pattern, indicating distinct unfolding stages.
- Plateaus in the PMF arise from metal ion-guanine interactions and water molecule uptake.
Conclusions:
- The study provides a quantitative description of 15-TBA unfolding under stretching.
- Molecular insights into base pair interactions and metal cation influence were elucidated.
- Findings enhance understanding of DNA aptamer mechanics and ion binding.
