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  • Title: Detection of proteins that recognize platinum-modified DNA using gel mobility shift assay.
    Author: Fujiwara Y, Kasahara K, Sugimoto Y, Nishio K, Ohmori T, Saijo N.
    Journal: Jpn J Cancer Res; 1990 Dec; 81(12):1210-3. PubMed ID: 2125989.
    Abstract:
    Using a gel mobility shift assay, we have identified proteins, in the nuclear extracts of a human lung cancer cell line, that recognize cis-diamminedichloroplatinum(II) (cis-DDP, CDDP)-modified DNA. A 158-base-pair double-stranded DNA fragment, derived from pBR322 plasmid DNA, was modified by either CDDP, tetrachloro(dl-trans)-1,2-diaminocyclohexaneplatinum(IV) (tetraplatin) or trans-DDP (the stereoisomer of CDDP and clinically ineffective). These platinum drug-modified probes were incubated with nuclear extracts and analyzed by gel mobility shift assay. Proteins in the extracts selectively recognized the clinically active platinum-modified DNA fragment. No binding to the trans-DDP-modified DNA fragment was observed. These proteins may play a role in the cytotoxicity or in a DNA repair process.
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