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. 1980 Aug;66(2):210–219. doi: 10.1172/JCI109846

Secondary Structure in Denatured DNA is Responsible for Its Reaction with Antinative DNA Antibodies of Systemic Lupus Erythematosus Sera

B David Stollar 1, Michael Papalian 1
PMCID: PMC371700  PMID: 6156950

Abstract

Experiments were designed to determine the basis for the strong competitive reaction of denatured DNA with systemic lupus erythematosus (SLE) antinative DNA antibodies. Secondary structure in denatured DNA was reflected in hyperchromicity upon heating and in multiphase kinetics of its digestion by S1 nuclease. Partial digestion by S1 nuclease completely eliminated the ability of denatured DNA to react with antidenatured DNA antibodies, but not its ability to react with SLE sera. S1 nuclease-resistant cores were isolated from extensively digested denatured DNA. These cores had secondary structure, including some stable fold-back helical regions. The cores, from 20 to several hundred base pairs in size, competed with native DNA for binding by SLE sera. Other experiments measured reactions of denatured DNA under conditions that affected its secondary structure content. Its competitive activity decreased as temperature was increased from 0° to 37°C, whereas the activity of native DNA was not altered in this temperature range. With DNA pieces of 90-110 base pairs, native fragments were much more effective than the denatured fragments, in which stable helical structure is less likely to occur than in high molecular weight denatured DNA. Competitive assays with mononucleotides, oligonucleotides, homopolymers, and RNA-DNA hybrids also indicated that two strands of polydeoxyribonucleotide were required for optimal reactions with these SLE serum antibodies. The antibodies can measure stable helical regions in denatured DNA; they may also stabilize short helical regions that occur in an equilibrium of conformational forms.

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Selected References

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