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. 1983;2(4):505–510. doi: 10.1002/j.1460-2075.1983.tb01454.x

Recognition of chemically damaged DNA by the gene 32 protein from bacteriophage T4.

J J Toulmé, T Behmoaras, M Guigues, C Hélène
PMCID: PMC555052  PMID: 6605246

Abstract

We have used fluorescence spectroscopy to investigate the binding of gene 32 protein from bacteriophage T4 to DNA which has been chemically modified with carcinogens or antitumor drugs. This protein exhibits a high specificity for single-stranded nucleic acids and binds more efficiently to DNA modified either with cis-diaminodichloroplatinum(II) or with aminofluorene derivatives than to native DNA. This increased affinity is related to the formation of locally unpaired regions which are strong binding sites for the single-strand binding protein. In contrast, gene 32 protein has the same affinity for native DNA, DNA containing methylated purines and DNA that has reacted with trans-diaminodichloroplatinum(II) or with chlorodiethylenetriaminoplatinum(II) chloride. These types of damage do not induce a sufficient structural change to allow gene 32 protein binding. Depurination of DNA does not create binding sites for the T4 gene 32 protein but nicked apurinic sites are strong ligands for the protein. This T4 single-strand binding protein does not exhibit a significantly increased affinity for nicked DNA as compared with native DNA. These results are discussed with respect to the recognition of DNA damage by proteins involved in DNA repair and to the possible role of single-strand binding proteins in DNA repair mechanisms.

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Selected References

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