Abstract
The adenomatous polyposis coli (APC) protein is a negative regulator of the mitogenic transcription factor β-catenin by stimulating its proteasomal degradation. This involves several APC domains, including the binding sites for axin/conductin, the recently described β-Catenin Inhibitory Domain (CID) and the third 20 amino acid repeat (20R3) that is a β-catenin-binding site. The four 15 amino acid repeats (15R) and the 20R1 are also β-catenin-binding sites, but their role in β-catenin degradation has remained unclear. We show here that binding of β-catenin to the 15R of APC is necessary and sufficient to target β-catenin for degradation whereas binding to the 20R1 is neither necessary nor sufficient. The first 15R displays the highest affinity for β-catenin in the 15R-20R1 module. Biallelic mutations of the APC gene lead tocolon cancer in familial adenomatous polyposis coli (FAP) and result in the synthesis of truncated products lacking domains involved in β-catenin degradation but still having a minimal length. The analysis of the distribution of truncating mutations along the APC sequence in colorectal tumours from FAP patients revealed that the first 15R is one target of the positive selection of mutations that lead to tumour development.
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Acknowledgements
We thank G Daum for technical, and A Doebler for secretarial assistances. We thank also I Wacker for critical reading of the paper. This work was supported by grants from the Interdisziplinäres Zentrum für Klinische Forschung (IZKF) and the Sander Stiftung to JB.
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Kohler, E., Brauburger, K., Behrens, J. et al. Contribution of the 15 amino acid repeats of truncated APC to β-catenin degradation and selection of APC mutations in colorectal tumours from FAP patients. Oncogene 29, 1663–1671 (2010). https://doi.org/10.1038/onc.2009.447
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DOI: https://doi.org/10.1038/onc.2009.447
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