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Protein microarrays have been used extensively to identify protein-protein interactions; however, this technology has not been widely applied to protein-DNA interactions. In particular, this work demonstrates the utility of this technique for rapidly identifying interactions of proteins with metal-modified DNA. Protein macroarray experiments were carried out with high mobility group protein 1 (HMG-1) and cisplatin- and chromium-modified 50-mer oligonucleotides to demonstrate "proof of principle." Commercially available protein microarrays containing many different classes of human proteins were then employed to search for additional interactions with cisplatin-modified DNA. The results of the microarray experiments confirmed some known interactions and, more importantly, identified many novel protein interactions, demonstrating the utility of this method as a rapid, high-throughput technique to discover proteins that interact with metal-modified DNA. |
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