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Characterization of the p53-rescue drug CP-31398 in vitro and in living cells

Abstract

The Pfizer compound CP-31398 has been reported to stabilize the core domain of the tumour suppressor p53 in vitro and be an effective anti-cancer drug by virtue of rescuing destabilized mutants of p53. We did not detect any interaction between the p53 core domain and CP-31398 in vitro by a wide range of quantitative biophysical techniques over a wide range of conditions. CP-31398 did not stabilize p53 in our experiments. However, we found that CP-31398 intercalated with DNA and also altered and destabilized the DNA-p53 core domain complex. We analysed by NMR TROSY the interaction of the domain with a DNA oligomer and identified the changes in the complex on the binding of CP-31398. CP-31398 also decreased sequence-specific DNA binding of wild-type p53 and His-273 mutant p53. CP-31398 had a non-specific toxic effect independent of mutant p53 expression in several cell lines carrying Tet-regulated mutant p53. CP-31398 caused a small increase in MDM-2 expression and a more pronounced p53-independent increase in Bax expression. CP-31398 did, however, induce the PAb1620 epitope (characteristic of native p53) in cells expressing His-175 mutant p53. This was prevented by cycloheximide, suggesting that any stabilizing action of CP-31398 would have to be on newly synthesized p53. One of the unstable mutants that was reported to have been rescued by CP-31398, R249S, does not bind DNA when folded at lower temperatures.

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Acknowledgements

This work was supported by the MRC of the UK, and the Swedish Cancer Society (Cancerfonden). TM Rippin receives a Herchel Smith Student of Organic Chemistry and an MRC scholarship, VJN Bykov is supported by a postdoctoral fellowship from the Swedish Cancer Society. We would like to thank SF Poget, A Ashtekar and K Goode for their expertise and assistance in mass spectrometry and Farzan Rastinejad, Pfizer Central Research, for the gift of CP-31398 and comments on the manuscript.

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Correspondence to Alan R Fersht.

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Rippin, T., Bykov, V., Freund, S. et al. Characterization of the p53-rescue drug CP-31398 in vitro and in living cells. Oncogene 21, 2119–2129 (2002). https://doi.org/10.1038/sj.onc.1205362

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