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Molecular and Cellular Biology, February 2001, p. 1260-1271, Vol. 21, No. 4
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.4.1260-1271.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Rrb1p, a Yeast Nuclear WD-Repeat Protein Involved in the Regulation of Ribosome Biosynthesis

Tatiana L. Iouk,1 John D. Aitchison,1,2 Shawna Maguire,1 and Richard W. Wozniak1,*

Department of Cell Biology, University of Alberta, Edmonton, Alberta, Canada T6G 2H7,1 and Institute for Systems Biology, Seattle, Washington 98105-60992

Received 14 June 2000/Returned for modification 24 July 2000/Accepted 20 November 2000

Ribosome biogenesis is regulated by environmental cues that coordinately modulate the synthesis of ribosomal components and their assembly into functional subunits. We have identified an essential yeast WD-repeat-containing protein, termed Rrb1p, that has a role in both the assembly of the 60S ribosomal subunits and the transcriptional regulation of ribosomal protein (RP) genes. Rrb1p is located in the nucleus and is concentrated in the nucleolus. Its presence is required to maintain normal cellular levels of 60S subunits, 80S ribosomes, and polyribosomes. The function of Rrb1p in ribosome biogenesis appears to be linked to its association with the ribosomal protein rpL3. Immunoprecipitation of Rrb1p from nuclear extracts revealed that it physically interacts with rpL3. Moreover, the overproduction of Rrb1p led to increases in cellular levels of free rpL3 that accumulated in the nucleus together with Rrb1p. The concentration of these proteins within the nucleus was dependent on ongoing protein translation. We also showed that overexpression of RRB1 led to an increase in the expression of RPL3 while all other examined RP genes were unaffected. In contrast, depletion of RRB1 caused an increase in the expression of all RP genes examined except RPL3. These results suggest that Rrb1p regulates RPL3 expression and uncouples it from the coordinated expression of other RP genes.

* Corresponding author. Mailing address: 5-14 Medical Sciences Bldg., Department of Cell Biology, University of Alberta, Edmonton, Alberta, Canada T6G 2H7. Phone: (780) 492-1384. Fax: (780) 492-0450. E-mail: rick.wozniak{at}ualberta.ca.

Molecular and Cellular Biology, February 2001, p. 1260-1271, Vol. 21, No. 4
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.4.1260-1271.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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