HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

J. Biol. Chem., Vol. 282, Issue 19, 14028-14037, May 11, 2007

This Article Full Text Full Text (PDF) All Versions of this Article: 282/19/14028    most recent M700256200v1 Submit a Letter to Editor Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by West, M. Articles by Johnson, A. W. Search for Related Content PubMed PubMed Citation Articles by West, M. Articles by Johnson, A. W. Social Bookmarking                      What's this?

Novel Interaction of the 60S Ribosomal Subunit Export Adapter Nmd3 at the Nuclear Pore Complex^*

From the Section of Molecular Genetics and Microbiology and the Institute for Cellular and Molecular Biology, the University of Texas, Austin, Texas 78712

Nuclear export of the large (60S) ribosomal subunit depends on the adapter protein Nmd3 to provide a nuclear export signal (NES). The leucine-rich NES is recognized by the export receptor Crm1 to mediate export via interaction with the nuclear pore complex (NPC). Here, we show that certain mutant Nmd3 proteins that are impaired for binding to the 60S subunit accumulate at the nuclear envelope. These mutant proteins also show enhanced binding to Crm1, both in vivo and in vitro. Although their interaction with the NPC is dependent on recognition of the NES by Crm1, their interaction with Crm1 is not strictly dependent on RanGTP. Using a collection of GFP-tagged nucleoporin mutants, we identified several nucleoporins, including components of the Nup82 complex that copurified with the mutant Nmd3. The Nup82 complex is on the cytoplasmic face of the NPC and has previously been shown to be important as a terminal binding site for Crm1-mediated export. Mutations in the Nup82 complex led to accumulation of wild-type Nmd3 in the nucleoplasm, suggesting that the interaction of mutant Nmd3 with the Nup82 complex reflects a defect in the bona fide export pathway for the 60S subunit. These results suggest that in the absence of the ribosome, Nmd3 is not efficiently released from Crm1 at the NPC.

Received for publication, January 10, 2007 , and in revised form, March 7, 2007.

^* This work was supported by National Institutes of Health Grant GM53655 (to A. W. J.). 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 Current address: The University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104.

² Current address: Asuragen, Austin, TX 78744.

³ To whom correspondence should be addressed: Section of Molecular Genetics and Microbiology, 1 University Station, A5000, The University of Texas at Austin, Austin, TX 78712-0162. Tel.: 512-475-6350; Fax: 512-471-7088; E-mail: arlen{at}mail.utexas.edu.

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

This article has been cited by other articles:

				H. Cui, S. K. Ghosh, and M. Jayaram The selfish yeast plasmid uses the nuclear motor Kip1p but not Cin8p for its localization and equal segregation J. Cell Biol., April 20, 2009; 185(2): 251 - 264. [Abstract] [Full Text] [PDF]

				M. E. Grespin, G. M. C. Bonamy, V. R. Roggero, N. G. Cameron, L. E. Adam, A. P. Atchison, V. M. Fratto, and L. A. Allison Thyroid Hormone Receptor {alpha}1 Follows a Cooperative CRM1/Calreticulin-mediated Nuclear Export Pathway J. Biol. Chem., September 12, 2008; 283(37): 25576 - 25588. [Abstract] [Full Text] [PDF]

				D. Engelsma, N. Valle, A. Fish, N. Salome, J. M. Almendral, and M. Fornerod A Supraphysiological Nuclear Export Signal Is Required for Parvovirus Nuclear Export Mol. Biol. Cell, June 1, 2008; 19(6): 2544 - 2552. [Abstract] [Full Text] [PDF]

				N.-J. Hung, K.-Y. Lo, S. S. Patel, K. Helmke, and A. W. Johnson Arx1 Is a Nuclear Export Receptor for the 60S Ribosomal Subunit in Yeast Mol. Biol. Cell, February 1, 2008; 19(2): 735 - 744. [Abstract] [Full Text] [PDF]