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Both cis-diamminedichloroplatinum(II) (cisplatin or cis-DDP) and trans-diamminedichloroplatinum(II) form covalent adducts with DNA. However, only the cis isomer is a potent anticancer agent. It has been postulated that the selective action of cis-DDP occurs through specific binding of nuclear proteins to cis-DDP-damaged DNA sites and that binding blocks DNA repair. We find that a very abundant nuclear protein, the linker histone H1, binds much more strongly to cis-platinated DNA than to trans-platinated or unmodified DNA. In competition experiments, H1 is shown to bind much more strongly than HMG1, which had been previously considered a major candidate for such binding in vivo.

The major chromatin protein histone H1 binds preferentially to cis -platinum-damaged DNA