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. 1987 Sep 11;15(17):6917–6935. doi: 10.1093/nar/15.17.6917

Reaction conditions affect the specificity of bromoacetaldehyde as a probe for DNA cruciforms and B-Z junctions.

M J McLean 1, J E Larson 1, F Wohlrab 1, R D Wells 1
PMCID: PMC306184  PMID: 2821485

Abstract

The reaction of bromoacetaldehyde (BAA) was investigated further with recombinant plasmids containing tracts of (CG)16, in pRW756, or (CA)32, in pRW777, which adopt left-handed Z-structures under the influence of negative supercoiling. The cruciform structures adopted by the inverted repeat sequences near the replication origins of the pBR322 vectors served as internal controls for the number of unpaired bases. The extent of reaction with the B-Z junctions and the cruciforms was dependent on the reaction and analysis conditions, the method of preparation of BAA, ionic conditions, and the amount of negative supercoiling. In contrast to the previous results of Kang and Wells, B-Z junctions in addition to cruciforms do react with BAA. However, more forcing conditions are required to detect this reaction since B-Z junctions appear to be less reactive than the single stranded loops of cruciforms. The site of reaction with DNA was readily mapped with high precision at the nucleotide level. Also, a simple method is described for determining the concentration of BAA as well as its intrinsic reactivity in a given ionic medium.

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