Abstract
Loc1p is an exclusively nuclear dsRNA-binding protein that affects the asymmetric sorting of ASH1 mRNA to daughter cells in Saccharomyces cerevisiae. In addition to the role in cytoplasmic RNA localization, Loc1p is a constituent of pre-60S ribosomes. Cells devoid of Loc1p display a defect in the synthesis of 60S ribosomal subunits, resulting in “half-mer” polyribosomes. Previously, we reported that Loc1p is located throughout the entire nucleus; however, upon closer inspection we discovered that Loc1p is enriched in the nucleolus consistent with a role in 60S ribosome biogenesis. Given that Loc1p is an RNA-binding protein and presumably functions in the assembly of 60S ribosomal subunits, we investigated if Loc1p has a role in rRNA processing and nuclear export of 60S subunits. Analysis of pre-rRNA processing revealed that loc1Δ cells exhibit gross defects in 25S rRNA synthesis, specifically a delay in processing at sites A0, A1 and A2 in 35S pre-rRNA. Furthermore, loc1Δ cells exhibit nuclear export defects for 60S ribosomal subunits, again, consistent with a role for Loc1p in the assembly of 60S ribosomal subunits. It is attractive to hypothesize that the two phenotypes associated with loc1Δ cells, namely altered ASH1 mRNA localization and ribosome biogenesis, are not mutually exclusive, but that ribosome biogenesis directly impacts mRNA localization.
Similar content being viewed by others
References
Adams CC, Jakovljevic J, Roman J, Harnpicharnchai P, Woolford JL Jr (2002) Saccharomyces cerevisiae nucleolar protein Nop7p is necessary for biogenesis of 60S ribosomal subunits. RNA 8:150–165
Aris JP, Blobel G (1988) Identification and characterization of a yeast nucleolar protein that is similar to a rat liver nucleolar protein. J Cell Biol 107:17–31
Bernstein A, Granneman S, Lee AV, Manickam S, Baserga SJ (2006) Comprehensive mutational analysis of yeast DEXD/H box RNA helicases involved in large ribosome subunit biogenesis. Mol Cell Biol 26:1195–1208
Brodsky AS, Silver PA (2000) Pre-mRNA processing factors are required for nuclear export. RNA 6:1737–1749
Catala M, Lamontagne B, Larose S, Ghazal G, Elela SA (2004) Cell cycle-dependent nuclear localization of yeast RNase III is required for efficient cell division. Mol Biol Cell 15:3015–3030
Chartrand P, Bertrand E, Singer RH, Long RM (2000) Sensitive and high-resolution detection of RNA in situ. Methods Enzymol 318:493–506
Collart MA, Oliviero S (1993) Preparation of yeast RNA. In: Ausubel FM, Brent R, Kingston RE, Moore DD, Seidman JG, Smith JA, Struhl K (eds) Current protocols in molecular biology. Greene Publishing Associates and Wiley-Interscience, New York, pp 13.12.11–13.12.12
De la Cruz J, Kressler D, Tollervey D, Linder P (1998) Dob1p (Mtr4p) is a putative ATP-dependent RNA helicase required for 3′ end formation of 5.8S rRNA in Saccharomyces cerevisiae. EMBO J 17:1128–1140
De Marchis ML, Giorgi A, Schinina ME, Bozzoni I, Fatica A (2005) Rrp15p, a novel component of pre-ribosomal particles required for 60S ribosome subunit maturation. RNA 11:495–502
Dez C, Tollervey D (2004) Ribosome synthesis meets the cell cycle. Curr Opin Microbiol 7:631–637
Dez C, Houseley J, Tollervey D (2006) Surveillance of nuclear-restricted pre-ribosomes within a subnucleolar region of Saccharomyces cerevisiae. EMBO J 25:1534–1546
Du YC, Stillman B (2002) Yph1p, an ORC-interacting protein: potential links between cell proliferation control, DNA replication, and ribosome biogenesis. Cell 109:835–848
Dunbar DA, Dragon F, Lee SJ, Baserga SJ (2000) A nucleolar protein related to ribosomal protein L7 is required for an early step in large ribosomal subunit biogenesis. Proc Natl Acad Sci USA 97:13027–13032
Fang F, Phillips S, Butler JS (2005) Rat1p and Rai1p function with the nuclear exosome in the processing and degradation of rRNA precursors. RNA 11:1571–1578
Fatica A, Tollervey D (2002) Making ribosomes. Curr Opin Cell Biol 14:313–318
Fatica A, Oeffinger M, Tollervey D, Bozzoni I (2003) Cic1p/Nsa3p is required for synthesis and nuclear export of 60S ribosomal subunits. RNA 9:1431–1436
Fingerman I, Nagaraj V, Norris D, Vershon AK (2003) Sfp1 plays a key role in yeast ribosome biogenesis. Eukaryot Cell 2:1061–1068
Fromont-Racine M, Senger B, Saveanu C, Fasiolo F (2003) Ribosome assembly in eukaryotes. Gene 313:17–42
Galani K, Nissan TA, Petfalski E, Tollervey D, Hurt E (2004) Rea1, a dynein-related nuclear AAA-ATPase, is involved in late rRNA processing and nuclear export of 60 S subunits. J Biol Chem 279:55411–55418
Gonsalvez GB, Urbinati CR, Long RM (2005) RNA localization in yeast: moving towards a mechanism. Biol Cell 97:75–86
Granneman S, Baserga SJ (2005) Crosstalk in gene expression: coupling and co-regulation of rDNA transcription, pre-ribosome assembly and pre-rRNA processing. Curr Opin Cell Biol 17:281–286
Gu W, Deng Y, Zenklusen D, Singer RH (2004) A new yeast PUF family protein, Puf6p, represses ASH1 mRNA translation and is required for its localization. Genes Dev 18:1452–1465
Harnpicharnchai P, Jakovljevic J, Horsey E, Miles T, Roman J, Rout M, Meagher D, Imai B, Guo Y, Brame CJ, Shabanowitz J, Hunt DF, Woolford JL Jr (2001) Composition and functional characterization of yeast 66S ribosome assembly intermediates. Mol Cell 8:505–515
Hong B, Brockenbrough JS, Wu P, Aris JP (1997) Nop2p is required for pre-rRNA processing and 60S ribosome subunit synthesis in yeast. Mol Cell Biol 17:378–388
Horsey EW, Jakovljevic J, Miles TD, Harnpicharnchai P, Woolford JL Jr (2004) Role of the yeast Rrp1 protein in the dynamics of pre-ribosome maturation. RNA 10:813–827
Huh W-K, Falvo JV, Gerke LC, Carroll AS, Howson RW, Weissman JS, O’Shea EK (2003) Global analysis of protein localization in budding yeast. Nature 425:686–691
Kadowaki T, Chen S, Hitomi M, Jacobs E, Kumagai C, Liang S, Schneiter R, Singleton D, Wisniewska J, Tartakoff AM (1994) Isolation and characterization of Saccharomyces cerevisiae mRNA transport-defective (mtr) mutants. J Cell Biol 126:649–659
Kallstrom G, Hedges J, Johnson A (2003) The putative GTPases Nog1p and Lsg1p are required for 60S ribosomal subunit biogenesis and are localized to the nucleus and cytoplasm, respectively. Mol Cell Biol 23:4344–4355
Kressler D, Linder P, de La Cruz J (1999) Protein trans-acting factors involved in ribosome biogenesis in Saccharomyces cerevisiae. Mol Cell Biol 19:7897–7912
Liang S, Hitomi M, Hu Y-H, Liu Y, Tartakoff AM (1996) A DEAD-Box-family protein is required for nucleocytoplasmic transport of yeast mRNA. Mol Cell Biol 16:5139–5146
Loar JW, et al (2004) Genetic and biochemical interactions among Yar1, Ltv1 and Rps3 define novel links between environmental stress and ribosome biogenesis in Saccharomyces cerevisiae. Genetics 168:1877–1889
Long RM, Singer RH, Meng X, Gonzalez I, Nasmyth K, Jansen RP (1997) Mating type switching in yeast controlled by asymmetric localization of ASH1 mRNA. Science 277:383–387
Long RM, Gu W, Meng X, Gonsalvez G, Singer RH, Chartrand P (2001) An exclusively nuclear RNA-binding protein affects asymmetric localization of ASH1 mRNA and Ash1p in yeast. J Cell Biol 153:307–318
Milkereit P, et al (2001) Maturation and intranuclear transport of pre-ribosomes requires Noc proteins. Cell 105:499–509
Miyoshi K, Shirai C, Horigome C, Takenami K, Kawasaki J, Mizuta K (2004) Rrs1p, a ribosomal protein L11-binding protein, is required for nuclear export of the 60S pre-ribosomal subunit in Saccharomyces cerevisiae. FEBS Lett 565:106–110
Morita D, et al (2002) Rpf2p, an evolutionarily conserved protein, interacts with ribosomal protein L11 and is essential for the processing of 27 SB Pre-rRNA to 25 S rRNA and the 60 S ribosomal subunit assembly in Saccharomyces cerevisiae. J Biol Chem 277:28780–28786
Nissan TA, Bassler J, Petfalski E, Tollervey D, Hurt E (2002) 60S pre-ribosome formation viewed from assembly in the nucleolus until export to the cytoplasm. EMBO J 21:5539–5547
Oeffinger M, Tollervey D (2003) Yeast Nop15p is an RNA-binding protein required for pre-rRNA processing and cytokinesis. EMBO J 22:6573–6583
Oeffinger M, Leung A, Lamond A, Tollervey D (2002) Yeast Pescadillo is required for multiple activities during 60S ribosomal subunit synthesis. RNA 8:626–636
Peng WT, et al (2003) A panoramic view of yeast noncoding RNA processing. Cell 113:919–933
Rose M, Winston F, Hieter P (1990) Methods in yeast genetics: a laboratory course manual. Cold Spring Harbor Laboratory Press, Cold Spring Harbor
Sambrook J, Russell DW (2001) Chapter 7: Protocol 6: separation of RNA according to size: electrophoresis of RNA through agarose gels containing formaldehyde. Protocol 7: transfer and fixation of denature RNA to membranes. In: Molecular cloning, 3rd edn. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, pp 7.31–7.41
Saracino F, Bassler J, Muzzini D, Hurt E, Agostoni Carbone ML (2004) The yeast kinase Swe1 is required for proper entry into cell cycle after arrest due to ribosome biogenesis and protein synthesis defects. Cell Cycle 3:648–654
Saveanu C, et al (2003) Sequential protein association with nascent 60S ribosomal particles. Mol Cell Biol 23:4449–4460
Stage-Zimmermann T, Schmidt U, Silver PA (2000) Factors affecting nuclear export of the 60S ribosomal subunit in vivo. Mol Biol Cell 11:3777–3789
Thomson E, Tollervey D (2005) Nop53p is required for late 60S ribosome subunit maturation and nuclear export in yeast. RNA 11:1215–1224
Tschochner H, Hurt E (2003) Pre-ribosomes on the road from the nucleolus to the cytoplasm. Trends Cell Biol 13:255–263
Venema J, Tollervey D (1999) Ribosome synthesis in Saccharomyces cerevisiae. Annu Rev Genet 33:261–311
Warner JR (1999) The economics of ribosome biosynthesis in yeast. Trends Biochem Sci 24:437–440
Acknowledgment
We thank Dr Pamela Silver (Harvard University) for the kind gift of Rpl11b-GFP plasmid, pPS2167. This work was supported by research grant NIH R01 GM060392 to R.M.L.
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by H. Ronne
Rights and permissions
About this article
Cite this article
Urbinati, C.R., Gonsalvez, G.B., Aris, J.P. et al. Loc1p is required for efficient assembly and nuclear export of the 60S ribosomal subunit. Mol Genet Genomics 276, 369–377 (2006). https://doi.org/10.1007/s00438-006-0151-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00438-006-0151-7