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Immunochemical detection of multiple conformations within a 36 base pair oligonucleotide
D G Sanford1, K J Kotkow, B D Stollar
1Department of Biochemistry, Tufts University Health Sciences Campus, Boston, MA 02111.
Nucleic Acids Research
|November 25, 1988
Summary
This study synthesized a chimeric oligonucleotide with distinct DNA and RNA/DNA hybrid regions. Antibody probes confirmed these regions adopt different conformations, including B-DNA, Z-DNA, and a unique RNA/DNA hybrid structure.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Oligonucleotides are crucial in molecular biology and therapeutics.
- Understanding DNA and RNA hybrid conformations is vital for nucleic acid research.
Purpose of the Study:
- To synthesize and characterize a chimeric oligonucleotide with distinct structural domains.
- To investigate the conformational adaptability of DNA and RNA/DNA hybrid regions within a single molecule.
Main Methods:
- Synthesis of a 36 base pair chimeric oligonucleotide.
- Utilized antibody probes for conformational detection.
- Employed Enzyme-Linked Immunosorbent Assay (ELISA) and gel electrophoresis retardation assays.
Main Results:
- The DNA duplex core adopted B-conformation in low salt (0.14 M NaCl).
- The DNA duplex core transitioned to Z-conformation in high salt (4 M NaCl).
- The RNA/DNA hybrid regions exhibited a unique conformation distinct from B-DNA and A-RNA.
Conclusions:
- Chimeric oligonucleotides can exhibit distinct, conformationally adaptable regions.
- Antibody probes are effective tools for discerning nucleic acid conformations.
- This work provides insights into the structural plasticity of hybrid nucleic acid structures.