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Stable sheared A.C pair in DNA hairpins
S H Chou1, Y Y Tseng, S W Wang
1Institute of Biochemistry, Department of National Chung-Hsing University, Taichung 40227, Taiwan. shchou@dragon.nchu.edu.tw
Journal of Molecular Biology
|March 19, 1999
Summary
Researchers discovered a novel sheared adenine-cytosine (A.C) base pair that stabilizes DNA hairpin loops. This finding expands our understanding of DNA structure and has implications for biological systems and aptamer selection.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- Sheared purine-purine base pairs stabilize DNA hairpin loops.
- These motifs are crucial in various biological systems.
Purpose of the Study:
- To investigate the formation and stability of a sheared purine-pyrimidine (A.C) base pair in DNA.
- To characterize this novel base pair under neutral pH conditions.
Main Methods:
- High-resolution Nuclear Magnetic Resonance (NMR) spectroscopy.
- Distance geometry calculations.
- Molecular dynamics simulations of d(GTACANCGTAC) oligomers.
Main Results:
- NMR data revealed numerous nuclear Overhauser enhancements (NOEs) across the A.C base pair.
- Specific NOEs between protons (C4NH2-AH1', C4NH2-AH2, CH5-AH2) confirmed the sheared geometry.
- The A.C base pair was found to be stable under neutral pH.
Conclusions:
- A novel sheared adenine-cytosine (A.C) base pair can stably close DNA hairpin loops.
- This base pair is potentially present in biological systems and DNA aptamers.
- The discovery expands the known repertoire of DNA base pairing.