Acta Crystallographica Section D

Biological Crystallography

Volume 69, Part 8 (August 2013)

research papers

Acta Cryst. (2013). D69, 1358-1366    [ doi:10.1107/S0907444913004459 ]

The structure of an MDM2-Nutlin-3a complex solved by the use of a validated MDM2 surface-entropy reduction mutant

B. Anil, C. Riedinger, J. A. Endicott and M. E. M. Noble

Abstract: The p53-binding site of MDM2 holds great promise as a target for therapeutic intervention in MDM2-amplified p53 wild-type forms of cancer. Despite the extensive validation of this strategy, there are relatively few crystallographically determined co-complex structures for small-molecular inhibitors of the MDM2-p53 interaction available in the PDB. Here, a surface-entropy reduction mutant of the N-terminal domain of MDM2 that has been designed to enhance crystallogenesis is presented. This mutant has been validated by comparative ligand-binding studies using differential scanning fluorimetry and fluorescence polarization anisotropy and by cocrystallization with a peptide derived from p53. Using this mutant, the cocrystal structure of MDM2 with the benchmark inhibitor Nutlin-3a has been determined, revealing subtle differences from the previously described co-complex of MDM2 with Nutlin-2.

PDB references: 4hfz and 4hg7

Keywords: MDM2; p53; Nutlin-3a; surface-entropy reduction; mutant validation.

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[ doi:10.1107/S0907444913004459/mn5020sup1.pdf ]
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