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. 1992 Mar 15;89(6):2307–2311. doi: 10.1073/pnas.89.6.2307

Isolation and characterization of human cDNA clones encoding a high mobility group box protein that recognizes structural distortions to DNA caused by binding of the anticancer agent cisplatin.

S L Bruhn 1, P M Pil 1, J M Essigmann 1, D E Housman 1, S J Lippard 1
PMCID: PMC48646  PMID: 1372440

Abstract

Human cDNA clones encoding a structure-specific recognition protein, SSRP1, that binds specifically to DNA modified with cisplatin have been isolated and characterized. The SSRP1 gene maps to human chromosome 11q12. The cDNA clones, obtained by using partial-length cDNAs described previously, predict an 81-kDa protein containing several highly charged domains and a stretch of 75 amino acids 47% identical to a portion of the high mobility group (HMG) protein HMG1. This HMG box most likely constitutes the structure recognition element for cisplatin-modified DNA, with the probable recognition motif being the local duplex unwinding and bending toward the major groove that occurs upon formation of intrastrand cis-[Pt(NH3)2]2+ d(GpG) and d(ApG) cross-links. Although the DNA recognition properties of members of the HMG-box family of proteins have been characterized with respect to their sequence specificity, the present work demonstrates that proteins with this domain can recognize particular DNA structures as well. The Pt-DNA SSRP described here is the human homolog of a recently identified mouse protein that binds to recombination signal sequences [Shirakata, M., Hüppi, K., Usuda, S., Okazaki, K., Yoshida, K. & Sakano, H. (1991) Mol. Cell. Biol. 11, 4528-4536]. These sequences have been postulated to form stem-loop structures, further implicating local bends and unwinding in DNA as a recognition target for HMG-box proteins. Expression analysis in a variety of tissues and cisplatin-resistant cell lines and the inability of cisplatin to induce the message in HeLa cells argue against a direct link between SSRP1 mRNA levels and the response of cells to the drug.

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Selected References

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