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J. Biol. Chem., Vol. 282, Issue 27, 19321-19330, July 6, 2007

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Nuclear Import of the MUC1-C Oncoprotein Is Mediated by Nucleoporin Nup62^*

From the Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115

The MUC1 heterodimeric transmembrane protein is aberrantly overexpressed by most human carcinomas. The MUC1 C-terminal subunit (MUC1-C) is devoid of a classical nuclear localization signal and is targeted to the nucleus by an unknown mechanism. The present results demonstrate that MUC1-C associates with importin and not importin . The results also show that, like importin , MUC1-C binds to Nup62 (nucleoporin p62). MUC1-C binds directly to the Nup62 central domain and indirectly to the Nup62 C-terminal -helical coiled-coil domain. We demonstrate that MUC1-C forms oligomers and that oligomerization is necessary for binding to Nup62. The MUC1-C cytoplasmic domain contains a CQC motif that when mutated to AQA abrogates oligomerization and binding to Nup62. Stable expression of MUC1 with the CQC AQA mutations was associated with targeting to the cell membrane and cytosol and attenuation of nuclear localization. The results further show that expression of MUC1(CQC-AQA) attenuates MUC1-induced (i) transcriptional coactivation, (ii) anchorage-independent growth, and (iii) tumorigenicity. These findings indicate that the MUC1-C oncoprotein is imported to the nucleus by a pathway involving Nup62.

Received for publication, April 17, 2007

^* This work was supported by NCI, National Institutes of Health Grant CA97098 and United States Army Grant DAMD17-03-1-0672. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement"in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ Present address: Beijing Institute of Biotechnology, Beijing 100850, China.

² To whom correspondence should be addressed: Dana-Farber Cancer Institute, 44 Binney St., Boston, MA 02115. Tel.: 617-632-3141; Fax: 617-632-2934; E-mail: donald_kufe{at}dfci.harvard.edu.

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