Published online 12 August 2005
Article |
Synergistic defect in 60S ribosomal subunit assembly caused by a mutation of Rrs1p, a ribosomal protein L11-binding protein, and 3'-extension of 5S rRNA in Saccharomyces cerevisiae
Department of Bioresource Science and Technology, Graduate School of Biosphere Science, Hiroshima University Kagamiyama, Higashi-Hiroshima 739-8528, Japan
*To whom correspondence should be addressed. Tel: +81 82 424 7923; Fax: +81 82 424 7923; Email: kmizuta{at}hiroshima-u.ac.jp
Received May 26, 2005. Revised August 1, 2005. Accepted August 1, 2005.
Rrs1p, a ribosomal protein L11-binding protein, has an essential role in biogenesis of 60S ribosomal subunits. We obtained conditionally synthetic lethal allele with the rrs1-5 mutation and determined that the mutation is in REX1, which encodes an exonuclease. The highly conserved leucine at 305 was substituted with tryptophan in rex1-1. The rex1-1 allele resulted in 3'-extended 5S rRNA. Polysome analysis revealed that rex1-1 and rrs1-5 caused a synergistic defect in the assembly of 60S ribosomal subunits. In vivo and in vitro binding assays indicate that Rrs1p interacts with the ribosomal protein L55S rRNA complex. The rrs1-5 mutation weakens the interaction between Rrs1p with both L5 and L11. These data suggest that the assembly of L55S rRNA on 60S ribosomal subunits coordinates with assembly of L11 via Rrs1p.
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