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Probing of DNA polymorphic structure in the cell with osmium tetroxide
E Palecek1, E Rasovská, P Boublíková
1Institute of Biophysics, Czechoslovak Academy of Sciences, Brno.
Biochemical and Biophysical Research Communications
|January 29, 1988
Summary
Osmium tetroxide, 2,2'-bipyridine effectively probes bacterial DNA structure. This method reveals structural distortions in DNA junctions and unusual DNA insert structures in E. coli.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Understanding DNA structure is crucial for cellular processes.
- Probing DNA structure in vivo presents significant challenges.
- Osmium tetroxide, 2,2ipyridine offers a novel approach for DNA structural analysis.
Purpose of the Study:
- To evaluate osmium tetroxide, 2,2ipyridine as a DNA structure probe in bacterial cells.
- To investigate structural distortions at DNA B-Z junctions.
- To analyze the structure of specific DNA inserts in plasmids.
Main Methods:
- Utilizing osmium tetroxide, 2,2ipyridine as a chemical probe.
- Analyzing DNA structure in recombinant plasmids (pRW751 and pAT32) within E. coli.
- Comparing in vivo and in vitro DNA structural characteristics.
Main Results:
- Demonstrated the presence of structural distortions at junctions between right-handed B-DNA and left-handed Z-DNA in plasmid pRW751.
- Identified an unusual structure of the d(A-T)16 insert within plasmid pAT32.
- Confirmed these structural findings in both E. coli cells and in vitro.
Conclusions:
- Osmium tetroxide, 2,2ipyridine is a valuable tool for probing DNA structure in vivo.
- B-Z DNA junctions and specific DNA inserts can exhibit complex structural features.
- The study provides insights into DNA structural dynamics within bacterial cells.