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Molecular and Cellular Biology, May 2001, p. 3405-3415, Vol. 21, No. 10
Biochemie-Zentrum Heidelberg, D-69120
Heidelberg, Germany1; Department of
Biochemistry, Dartmouth Medical School, Hanover, New Hampshire
037552; and Institute of Cell and
Molecular Biology, University of Edinburgh, Edinburgh EH9 3JR,
United Kingdom3
Received 7 December 2000/Returned for modification 17 January
2001/Accepted 19 February 2001
Nuclear export of ribosomes requires a subset of nucleoporins and
the Ran system, but specific transport factors have not been
identified. Using a large subunit reporter (Rpl25p-eGFP), we have
isolated several temperature-sensitive ribosomal export (rix) mutants. One of these corresponds to the ribosomal
protein Rpl10p, which interacts directly with Nmd3p, a conserved and
essential protein associated with 60S subunits. We find that
thermosensitive nmd3 mutants are impaired in large subunit
export. Strikingly, Nmd3p shuttles between the nucleus and cytoplasm
and is exported by the nuclear export receptor Xpo1p. Moreover, we show
that export of 60S subunits is Xpo1p dependent. We conclude that
nuclear export of 60S subunits requires the nuclear export
sequence-containing nonribosomal protein Nmd3p, which directly binds to
the large subunit protein Rpl10p.
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.10.3405-3415.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Nuclear Export of 60S Ribosomal Subunits Depends on Xpo1p and
Requires a Nuclear Export Sequence-Containing Factor, Nmd3p, That
Associates with the Large Subunit Protein Rpl10p
*
Corresponding author. Mailing address:
Biochemie-Zentrum Heidelberg, Im Neuenheimer Feld 328, D-69120
Heidelberg, Germany. Phone: 49-(0)6221-54-4173. Fax:
49-(0)6221-54-4369. E-mail:
cg5{at}ix.urz.uni-heidelberg.de.
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