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PMID:1825809

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Citation

Tollervey, D, Lehtonen, H, Carmo-Fonseca, M and Hurt, EC (1991) The small nucleolar RNP protein NOP1 (fibrillarin) is required for pre-rRNA processing in yeast. EMBO J. 10:573-83

Abstract

The yeast snoRNP protein, NOP1, is structurally and functionally homologous to vertebrate fibrillarin and is essential for viability. A conditionally lethal allele was constructed by placing NOP1 expression under the control of a GAL promoter. Growth on glucose medium results in the depletion of NOP1 over several generations, during which cell growth is progressively impaired. Pulse labelling of proteins shows that NOP1 depleted strains are greatly impaired in the production of cytoplasmic ribosomes, and they have a reduced level of rRNA. Northern hybridization and pulse-chase labelling of pre-rRNA show a progressive impairment of all pre-rRNA processing steps. The pathway leading to 18S rRNA is particularly affected. Methylation of pre-rRNA is concomitantly impaired and unmethylated pre-rRNA accumulates and is not processed over long periods. NOP1 depletion does not prevent the accumulation of seven snoRNAs tested including U3; the levels of two species, U14 and snR190, decline. The snoRNAs synthesized in the absence of NOP1 retain TMG cap structures. Subnuclear fractionation and immunocytochemistry indicate that they continue to be localized in the nucleolus.

Links

PubMed PMC452687

Keywords

Base Sequence; Blotting, Northern; Chromosomal Proteins, Non-Histone/metabolism; DNA, Ribosomal/genetics; Fungal Proteins/genetics; Fungal Proteins/metabolism; Genes, Fungal; Genes, Lethal; Molecular Sequence Data; Nuclear Proteins/genetics; Nuclear Proteins/metabolism; Nucleic Acid Hybridization; Oligonucleotide Probes; Promoter Regions, Genetic; RNA Precursors/genetics; RNA, Ribosomal/genetics; RNA, Small Nuclear/genetics; RNA, Small Nuclear/isolation & purification; Ribonucleoproteins/metabolism; Ribonucleoproteins, Small Nuclear; Ribonucleoproteins, Small Nucleolar; Ribosomes/metabolism; Saccharomyces cerevisiae/genetics; Saccharomyces cerevisiae/metabolism; Saccharomyces cerevisiae Proteins

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

YEAST:FBRL

involved_in

GO:0006364: rRNA processing

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

YEAST:FBRL

involved_in

GO:0043144: sno(s)RNA processing

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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