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. 1996 Oct 15;24(20):3896–3902. doi: 10.1093/nar/24.20.3896

Site-specific and photo-induced alkylation of DNA by a dimethylanthraquinone-oligodeoxynucleotide conjugate.

H Kang 1, S E Rokita 1
PMCID: PMC146215  PMID: 8918789

Abstract

A dialkyl-substituted anthraquinone derivative was synthesized and ligated to a sequence-directing oligodeoxynucleotide to examine its efficiency and specificity for cross-linking to complementary sequences of DNA. The anthraquinone appendage stabilized spontaneous hybridization of the target and probe sequences through non-covalent interactions, as indicated by thermal denaturation studies. Covalent modification of the target was induced by exposure to near UV light (lambda > 335 nm) to generate cross-linked duplexes in yields as great as 45%. Reaction was dependent on the first unpaired nucleotide extended beyond the duplex formed by association of the target and probe. A specificity of C > T > A = G was determined for modification at this position. The overall site and nucleotide selectivity seems to originate from the chemical requirements of cross-linking and does not likely reflect the dominant solution structure of the complex prior to irradiation.

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Selected References

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