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J. Biol. Chem., Vol. 277, Issue 43, 41282-41286, October 25, 2002

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The La RNA-binding Protein Interacts with the Vault RNA and Is a Vault-associated Protein^*

Valerie A. Kickhoefer^§, Michael J. Poderycki, Edward K. L. Chan^¶, and Leonard H. Rome

From the  Department of Biological Chemistry and the Jonsson Comprehensive Cancer Center, The David Geffen School of Medicine, University of California, Los Angeles, California 90095-1737 and the ^¶ Department of Molecular and Experimental Medicine, The W. M. Keck Autoimmune Disease Center, Scripps Research Institute, La Jolla, California 92037

Vaults are highly conserved ubiquitous ribonucleoprotein particles with an undefined function. Three protein species (p240/TEP1, p193/VPARP, and p100/MVP) and a small RNA comprise the 13-MDa vault particle. The expression of the unique 100-kDa major vault protein is sufficient to form the basic vault structure. Previously, we have shown that stable association of the vault RNA with the vault particle is dependent on its interaction with the p240/TEP1 protein. To identify other proteins that interact with the vault RNA, we used a UV-cross-linking assay. We find that a portion of the vault RNA is complexed with the La autoantigen in a separate smaller ribonucleoprotein particle. La interacts with the vault RNA (both in vivo and in vitro) presumably through binding to 3'-uridylates. Moreover, we also demonstrate that the La autoantigen is the 50-kDa protein that we have previously reported as a protein that co-purifies with vaults.

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