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. 1989 Nov;86(21):8328–8332. doi: 10.1073/pnas.86.21.8328

Isolation of cDNAs encoding a human protein that binds selectively to DNA modified by the anticancer drug cis-diamminedichloroplatinum(II)

J H Toney 1, B A Donahue 1, P J Kellett 1, S L Bruhn 1, J M Essigmann 1, S J Lippard 1
PMCID: PMC298274  PMID: 2530581

Abstract

DNA modified by the antitumor drug cis-diamminedichloroplatinum(II) (cis-DDP or cisplatin) was used to identify a factor in mammalian cells that binds to cis-DDP-damaged DNA and hence may play a role in repair. This factor selectively recognizes double-stranded DNA fragments modified by cis-DDP or [Pt(en)Cl2] (en, ethylenediamine). Little or no binding occurs to unmodified double-stranded DNA or to DNA modified with the clinically ineffective compounds trans-DDP and [Pt(dien)Cl]Cl (dien, diethylenetriamine). Low levels of binding to single-stranded DNA modified by cis-DDP are observed. The apparent molecular mass of the factor in a variety of mammalian cells is approximately 100 kDa, as determined by modified Western blotting. Two recombinant phage have been isolated from a human B-cell lambda gt11 library by using a cis-DDP-modified DNA restriction fragment as a probe. The two clones have insert sizes of 1.88 and 1.44 kilobases and are aligned at their 5' ends. The polypeptides encoded by the recombinant phage exhibit DNA binding properties similar to those of the cellular factor identified in crude extracts prepared from mammalian cells. Northern analysis with one of the clones revealed an mRNA of 2.8 kilobases that is conserved in humans and rodents. The methods used here should be applicable in studies of other damage-specific DNA binding proteins.

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