Roles of the HEAT repeat proteins Utp10 and Utp20 in 40S ribosome maturation

A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae. We report the detailed characterization of two of these factors, Utp10 and Utp20, which were initially identified as components of the small subunit processome. Coprecipitation analys...

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Published inRNA (Cambridge) Vol. 13; no. 9; pp. 1516 - 1527
Main Authors Dez, Christophe, Dlakić, Mensur, Tollervey, David
Format Journal Article
LanguageEnglish
Published United States Cold Spring Harbor Laboratory Press 01.09.2007
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Abstract A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae. We report the detailed characterization of two of these factors, Utp10 and Utp20, which were initially identified as components of the small subunit processome. Coprecipitation analyses confirmed the association of Utp10 and Utp20 with U3 snoRNA and the early pre-rRNA processing intermediates. Particularly strong association was seen with aberrant processing intermediates, which may help target these RNAs for degradation. Genetic depletion of either protein inhibited the early pre-rRNA processing steps in 18S rRNA maturation but had little effect on pre-rRNA transcription or synthesis of the 25S or 5.8S rRNAs. The absence of the poly(A) polymerase Trf5, a component of the TRAMP5 complex and exosome cofactor, led to stabilization of the aberrant 23S RNA in strains depleted of Utp10 or Utp20. In the case of Utp10, 20S pre-rRNA synthesis was also modestly increased by this loss of surveillance activity.
AbstractList A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae. We report the detailed characterization of two of these factors, Utp10 and Utp20, which were initially identified as components of the small subunit processome. Coprecipitation analyses confirmed the association of Utp10 and Utp20 with U3 snoRNA and the early pre-rRNA processing intermediates. Particularly strong association was seen with aberrant processing intermediates, which may help target these RNAs for degradation. Genetic depletion of either protein inhibited the early pre-rRNA processing steps in 18S rRNA maturation but had little effect on pre-rRNA transcription or synthesis of the 25S or 5.8S rRNAs. The absence of the poly(A) polymerase Trf5, a component of the TRAMP5 complex and exosome cofactor, led to stabilization of the aberrant 23S RNA in strains depleted of Utp10 or Utp20. In the case of Utp10, 20S pre-rRNA synthesis was also modestly increased by this loss of surveillance activity.
A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae . We report the detailed characterization of two of these factors, Utp10 and Utp20, which were initially identified as components of the small subunit processome. Coprecipitation analyses confirmed the association of Utp10 and Utp20 with U3 snoRNA and the early pre-rRNA processing intermediates. Particularly strong association was seen with aberrant processing intermediates, which may help target these RNAs for degradation. Genetic depletion of either protein inhibited the early pre-rRNA processing steps in 18S rRNA maturation but had little effect on pre-rRNA transcription or synthesis of the 25S or 5.8S rRNAs. The absence of the poly(A) polymerase Trf5, a component of the TRAMP5 complex and exosome cofactor, led to stabilization of the aberrant 23S RNA in strains depleted of Utp10 or Utp20. In the case of Utp10, 20S pre-rRNA synthesis was also modestly increased by this loss of surveillance activity.
Author Dlakić, Mensur
Tollervey, David
Dez, Christophe
AuthorAffiliation 2 Department of Microbiology, Montana State University, Bozeman, Montana 59717-3520, USA
1 Wellcome Trust Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3JR, Scotland
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Reprint requests to: David Tollervey, Wellcome Trust Centre for Cell Biology, University of Edinburgh, King's Buildings, Edinburgh EH9 3JR, Scotland; e-mail: d.tollervey@ed.ac.uk; fax: 44-131-650-7040.
Present address: Laboratoire de Biologie Moléculaire Eucaryote, CNRS-Université Paul Sabatier, IFR109, Toulouse, France.
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Snippet A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae. We report the detailed characterization of...
A family of HEAT-repeat containing ribosome synthesis factors was previously identified in Saccharomyces cerevisiae . We report the detailed characterization...
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SubjectTerms Models, Molecular
Repetitive Sequences, Amino Acid
Ribonucleoproteins, Small Nuclear - genetics
Ribonucleoproteins, Small Nuclear - physiology
Ribonucleoproteins, Small Nucleolar - genetics
Ribonucleoproteins, Small Nucleolar - physiology
RNA Processing, Post-Transcriptional - physiology
RNA, Ribosomal, 18S - biosynthesis
RNA, Small Nucleolar - genetics
RNA, Small Nucleolar - physiology
Saccharomyces cerevisiae
Saccharomyces cerevisiae - genetics
Saccharomyces cerevisiae - growth & development
Saccharomyces cerevisiae - metabolism
Saccharomyces cerevisiae Proteins - genetics
Saccharomyces cerevisiae Proteins - physiology
Signal Transduction - genetics
Title Roles of the HEAT repeat proteins Utp10 and Utp20 in 40S ribosome maturation
URI https://www.ncbi.nlm.nih.gov/pubmed/17652137
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