Cross-linking of nuclear proteins to DNA by platinum compounds

In this work we investigated the lymphocyte nuclear proteins which participated in DNA-protein cross-links induced by three platinum compounds: cis-DDP, trans-DDP and carboplatin. Our studies indicated that many proteins were cross- linked to DNA in the intact cell. Trans-DDP was the most effective cross-linker. The cross-linking process depended on time of the cells incubation with aforementioned compounds. Carboplatin produced the DNA-protein cross-links more slowly and less effectively than cis-DDP. After incubation of the cells with cis-DDP, trans- DDP and carboplatin a similar protein pattern was obtained. In case of all compounds studied 34.5 kDa protein was abundantly represented.