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. 1980 Jun;77(6):3201–3205. doi: 10.1073/pnas.77.6.3201

Recognition of chemical carcinogen-modified DNA by a DNA-binding protein.

F Moranelli, M W Lieberman
PMCID: PMC349582  PMID: 6932015

Abstract

Using a filter binding assay, we have detected and partially purified a protein from human placenta that has a high affinity for N-acetoxy-2-acetylaminofluorene-modified double-stranded DNA (AAF-[3H]DNA) of bacteriophage T7. This protein has been partially purified from a 1 M NaCl extract of a crude nuclear fraction by a combination of ion-exchange and nucleic acid affinity chromatography. With AAF-[3H]DNA as the substrate, the binding reaction reached equlibrium within 1 hr at 4 degrees C, and the extent of binding ws proportional to the amount of protein added. Complex formation was dependent on both pH and salt concentration and was unaffected by the presence of sulfhydryl-blocking agents. The purest protein fraction also recognizes DNA modified with methylmethane-sulfonate or methylnitrosourea. It shows little or no recognition of single-stranded DNA, double-stranded DNA, supercoiled bacteriophage phiX174 DNA, partially depurinated DNA, glucosylated bacteriophage T4DNA, or UV-irradiated DNA. No endo- or exonuclease activity, DNA polymerase activity, or glucosylase activity for AAF-DNA was detectable in the preparation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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