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. 1994 Sep 1;302(Pt 2):567–571. doi: 10.1042/bj3020567

2-Chloro-2'-deoxyadenosine monophosphate residues in DNA enhance susceptibility to 3'-->5' exonucleases.

P Hentosh 1, P Grippo 1
PMCID: PMC1137265  PMID: 7916566

Abstract

2-Chloro-2'-deoxyadenosine triphosphate, a purine nucleotide analogue and potent antileukaemic agent, was incorporated into double-stranded 36-mers in place of dATP to investigate the effects of 2-chloroadenine (ClAde) on DNA polymerase-associated 3'-->5' exonuclease activity. ClAde residues within one strand of duplex DNA did not inhibit exonuclease activity; on the contrary, ClAde-containing minus strands were digested to a greater extent than was control DNA in the absence of deoxyribonucleoside triphosphates by Escherichia coli Klenow fragment, yeast DNA polymerase II and T4 DNA polymerase. After a 30 min incubation with 5 units of Klenow fragment, approximately 65% of control DNA remained in DNA fragments of 26 bases or larger compared with only approximately 25% of ClAde-substituted substrates. Unsubstituted plus strands opposite a ClAde-containing strand were likewise digested more quickly by 3'-->5' exonuclease, but only in the vicinity of the ClAde sites. Approx. 63% of the plus strands from ClAde-containing oligomers were less than 24 bases in length after a 25 min digestion period with Klenow fragment compared with only approximately 32% of control DNA. Such results indicate that, unlike other base modifications such as pyrimidine dimers, methoxy psoralen adducts and certain nucleoside analogues, all of which inhibit or decrease the rate of strand degradation by 3'-->5' exonucleases, incorporated ClAde enhances strand degradation of duplex DNA.

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Selected References

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