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Assembly factors Rpf2 and Rrs1 recruit 5S rRNA and ribosomal proteins rpL5 and rpL11 into nascent ribosomes

¹ Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA; ² Division of Pulmonary and Critical Care Medicine, School of Medicine, John Hopkins University, Baltimore, Maryland 21224, USA; ³ Rockefeller University, New York, New York 10021, USA; ⁴ Banting and Best Department of Medical Research, University of Toronto, Toronto, Ontario M5S 3E1, Canada

More than 170 proteins are necessary for assembly of ribosomes in eukaryotes. However, cofactors that function with each of these proteins, substrates on which they act, and the precise functions of assembly factors—e.g., recruiting other molecules into preribosomes or triggering structural rearrangements of pre-rRNPs—remain mostly unknown. Here we investigated the recruitment of two ribosomal proteins and 5S ribosomal RNA (rRNA) into nascent ribosomes. We identified a ribonucleoprotein neighborhood in preribosomes that contains two yeast ribosome assembly factors, Rpf2 and Rrs1, two ribosomal proteins, rpL5 and rpL11, and 5S rRNA. Interactions between each of these four proteins have been confirmed by binding assays in vitro. These molecules assemble into 90S preribosomal particles containing 35S rRNA precursor (pre-rRNA). Rpf2 and Rrs1 are required for recruiting rpL5, rpL11, and 5S rRNA into preribosomes. In the absence of association of these molecules with pre-rRNPs, processing of 27SB pre-rRNA is blocked. Consequently, the abortive 66S pre-rRNPs are prematurely released from the nucleolus to the nucleoplasm, and cannot be exported to the cytoplasm.

[Keywords: 5S rRNA; rpL5; rpL11; yeast preribosomes; ribosome assembly subcomplexes]

Received May 9, 2007; revised version accepted August 21, 2007.

E-MAIL jw17{at}andrew.cmu.edu; FAX (412) 268-7129.

Supplemental material is available at http://www.genesdev.org

Article is online at http://www.genesdev.org/cgi/doi/10.1101/gad.1569307

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