Abstract
The ubiquitin-like molecule NEDD8 is essential for viability, growth and development, and is a potential target for therapeutic intervention. We found that the small molecule inhibitor of NEDDylation, MLN4924, alters the morphology and increases the surface size of the nucleolus in human and germline cells of Caenorhabditis elegans in the absence of nucleolar fragmentation. SILAC proteomics and monitoring of rRNA production, processing and ribosome profiling shows that MLN4924 changes the composition of the nucleolar proteome but does not inhibit RNA Pol I transcription. Further analysis demonstrates that MLN4924 activates the p53 tumour suppressor through the RPL11/RPL5-Mdm2 pathway, with characteristics of nucleolar stress. The study identifies the nucleolus as a target of inhibitors of NEDDylation and provides a mechanism for p53 activation upon NEDD8 inhibition. It also indicates that targeting the nucleolar proteome without affecting nucleolar transcription initiates the required signalling events for the control of cell cycle regulators.
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Acknowledgements
We are grateful to Dr Yanping Zhang for providing the wild-type and mutant Mdm2 C305F MEFs, the Montpellier RIO Imaging facility and Stefano Fumagalli for critical reading of the manuscript. AB and AP are supported by an ANR (National Agency for Research) postdoctoral fellowship awarded to AB. The project in DPX laboratory was supported by ATIP/AVENIR and Marie Curie Career Integration (FP7) grants.
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PS was an employee of Millennium Pharmaceuticals at the start of the studies. The other authors declare no conflict of interest.
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Bailly, A., Perrin, A., Bou Malhab, L. et al. The NEDD8 inhibitor MLN4924 increases the size of the nucleolus and activates p53 through the ribosomal-Mdm2 pathway. Oncogene 35, 415–426 (2016). https://doi.org/10.1038/onc.2015.104
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DOI: https://doi.org/10.1038/onc.2015.104
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