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- W2130885824 abstract "Abstract Structural distortions on the boundary between right-handed and left-handed DNA segments in negatively supercoiled plasmid pRW751 (a derivative of pBR322 containing (dC-dG)13 and (dC-dG)16 segments) were studied by means of osmium tetroxide, pyridine and glyoxal. These two probes react preferentially with single-stranded DNA but only the latter requires non-paired bases for the reaction. Nuclease SI and testing of the inhibition of BamHI cleavage (whose recognition sequences GGATCC lie on the “outer” boundaries between the (dC-dG)n and the pBR322 nucleotide sequence) were used to detect the site-specific chemical modification in pRW751. As a result of glyoxal treatment BamHI cleavage was strongly inhibited in topoisomeric samples whose superhelical density was sufficiently negative to stabilize the (dC-dG)n segments in the left-handed form. Osmium tetroxide, pyridine modification resulted in a similar inhibition of BamHI cleavage and in a formation of nuclease SI sensitive sites. The results suggest that the “outer” B-Z junctions in pRW751 contain one or few non-paired bases or non-Watson- Crick base pairs." @default.
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- W2130885824 date "1987-10-01" @default.
- W2130885824 modified "2023-10-17" @default.
- W2130885824 title "B-Z Junctions in Supercoiled pRW751 DNA Contain Unpaired Bases or Non-Watson-Crick Base Pairs" @default.
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- W2130885824 doi "https://doi.org/10.1080/07391102.1987.10506395" @default.
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