The KRR1 gene encodes a protein required for 18S rRNA synthesis and 40S ribosomal subunit assembly in Saccharomyces cerevisiae.
The newly discovered Saccharomyces cerevisiae gene KRR1 (YCL059c) encodes a protein essential for cell viability. Krr1p contains a motif of clustered basic amino acids highly conserved in the evolutionarly distant species from yeast to human. We demonstrate that Krr1p is localized in the nucleolus. The KRR1 gene is highly expressed in dividing cells and its expression ceases almost completely when cells enter the stationary phase. In vivo depletion of Krr1p leads to drastic reduction of 40S ribosomal subunits due to defective 18S rRNA synthesis. We propose that Krr1p is required for proper processing of pre-rRNA and the assembly of preribosomal 40S subunits.
Gromadka
R
R
Institute of Biochemistry and Biophysics, Polish Academy of Science, Warszawa.
Rytka
J
J
D001665:Binding Sites; D015152:Blotting, Northern; D015153:Blotting, Western; D002455:Cell Division; D000939:Epitopes; D005656:Fungal Proteins / Q000235:genetics / Q000502:physiology*; D008957:Models, Genetic; D010957:Plasmids / Q000378:metabolism; D016133:Polymerase Chain Reaction; D011132:Polyribosomes / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D012335:RNA, Ribosomal / Q000378:metabolism* / Q000502:physiology*; D012337:RNA, Ribosomal, 18S / Q000378:metabolism*; D016601:RNA-Binding Proteins; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D013997:Time Factors
D000939:Epitopes; D005656:Fungal Proteins; C099980:KRR1 protein, S cerevisiae; D012335:RNA, Ribosomal; D012337:RNA, Ribosomal, 18S; D016601:RNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D012313:RNA