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- W1570668711 abstract "Five monoclonal anti-Z-DNA antibodies were characterized with respect to their binding of synthetic nucleic acid polymers and of supercoiled circular plasmid DNA. All of the antibodies reacted only with DNA in the Z-conformation; however, they fell into two classes on the basis of sequence specificity. One class, with broad specificity, reacted well with all sequences in the Z-form, including poly(dG-dC), poly(dG-dm5C), and poly (dG-dBr5C) in linear polymers and poly(dG-dC)n and poly[(dC-dA)n.(dT-dG)n] sequences in supercoiled plasmids. The other class bound only Z-DNA formed by poly(dG-dC). Binding of the monoclonal antibodies specifically to inserts of Z-DNA-forming sequences in plasmids was mapped directly by cross-linking of antibody to the DNA, digestion with restriction nuclease, and electrophoretic analysis of both the unbound fragments and the bound fragments recovered from immune complexes. The monoclonal antibodies were used for indirect immunofluorescence staining of Drosophila polytene chromosomes fixed by two procedures. One procedure yielded chromosomes with Z-specific antibody binding in many interbands, a few specific bands, and parts of some puffs. On chromosomes fixed by the second procedure, antibody staining appeared to follow the DNA concentration, staining all bands brightly. For each fixation procedure, chromosomes showed the same staining pattern with each of the broad specificity monoclonal antibodies that had been seen with polyclonal antibodies. The antibodies that reacted only with poly(dG-dC) and poly (dG-dC)n plasmid inserts did not stain chromosomes fixed by either protocol. We conclude that stretches of poly(dG-dC)n sequences do not contribute significantly to the presence of Z-DNA in fixed polytene chromosomes of Drosophila melanogaster." @default.
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- W1570668711 date "1986-01-01" @default.
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- W1570668711 title "Analysis of Z-DNA in fixed polytene chromosomes with monoclonal antibodies that show base sequence-dependent selectivity in reactions with supercoiled plasmids and polynucleotides." @default.
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- W1570668711 doi "https://doi.org/10.1016/s0021-9258(17)42494-x" @default.
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