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Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast
Small ribosomal subunits are co-transcriptionally assembled on the nascent precursor rRNA in Saccharomyces cerevisiae. It is unknown how the highly intertwined structure of 60S large ribosomal subunits is initially formed. Here, we affinity purified and analyzed a series of pre-60S particles assembl...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499802/ https://www.ncbi.nlm.nih.gov/pubmed/28402444 http://dx.doi.org/10.1093/nar/gkx254 |
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author | Chen, Wu Xie, Zhensheng Yang, Fuquan Ye, Keqiong |
author_facet | Chen, Wu Xie, Zhensheng Yang, Fuquan Ye, Keqiong |
author_sort | Chen, Wu |
collection | PubMed |
description | Small ribosomal subunits are co-transcriptionally assembled on the nascent precursor rRNA in Saccharomyces cerevisiae. It is unknown how the highly intertwined structure of 60S large ribosomal subunits is initially formed. Here, we affinity purified and analyzed a series of pre-60S particles assembled in vivo on plasmid-encoded pre-rRNA fragments of increasing lengths, revealing a spatiotemporal assembly map for 34 trans-acting assembly factors (AFs), 30 ribosomal proteins and 5S rRNA. The gradual association of AFs and ribosomal proteins with the pre-rRNA fragments strongly supports that the pre-60S is co-transcriptionally, rather than post-transcriptionally, assembled. The internal and external transcribed spacers ITS1, ITS2 and 3΄ ETS in pre-rRNA must be processed in pre-60S. We show that the processing machineries for ITS1 and ITS2 are primarily recruited by the 5΄ and 3΄ halves of pre-27S RNA, respectively. Nevertheless, processing of both ITS1 and ITS2 requires a complete 25S region. The 3΄ ETS plays a minor role in ribosome assembly, but is important for efficient rRNA processing and ribosome maturation. We also identified a distinct pre-60S state occurring before ITS2 processing. Our data reveal the elusive co-transcriptional assembly pathway of large ribosomal subunit. |
format | Online Article Text |
id | pubmed-5499802 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-54998022017-07-12 Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast Chen, Wu Xie, Zhensheng Yang, Fuquan Ye, Keqiong Nucleic Acids Res RNA Small ribosomal subunits are co-transcriptionally assembled on the nascent precursor rRNA in Saccharomyces cerevisiae. It is unknown how the highly intertwined structure of 60S large ribosomal subunits is initially formed. Here, we affinity purified and analyzed a series of pre-60S particles assembled in vivo on plasmid-encoded pre-rRNA fragments of increasing lengths, revealing a spatiotemporal assembly map for 34 trans-acting assembly factors (AFs), 30 ribosomal proteins and 5S rRNA. The gradual association of AFs and ribosomal proteins with the pre-rRNA fragments strongly supports that the pre-60S is co-transcriptionally, rather than post-transcriptionally, assembled. The internal and external transcribed spacers ITS1, ITS2 and 3΄ ETS in pre-rRNA must be processed in pre-60S. We show that the processing machineries for ITS1 and ITS2 are primarily recruited by the 5΄ and 3΄ halves of pre-27S RNA, respectively. Nevertheless, processing of both ITS1 and ITS2 requires a complete 25S region. The 3΄ ETS plays a minor role in ribosome assembly, but is important for efficient rRNA processing and ribosome maturation. We also identified a distinct pre-60S state occurring before ITS2 processing. Our data reveal the elusive co-transcriptional assembly pathway of large ribosomal subunit. Oxford University Press 2017-06-20 2017-04-11 /pmc/articles/PMC5499802/ /pubmed/28402444 http://dx.doi.org/10.1093/nar/gkx254 Text en © The Author(s) 2017. Published by Oxford University Press on behalf of Nucleic Acids Research. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com |
spellingShingle | RNA Chen, Wu Xie, Zhensheng Yang, Fuquan Ye, Keqiong Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title | Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title_full | Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title_fullStr | Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title_full_unstemmed | Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title_short | Stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
title_sort | stepwise assembly of the earliest precursors of large ribosomal subunits in yeast |
topic | RNA |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5499802/ https://www.ncbi.nlm.nih.gov/pubmed/28402444 http://dx.doi.org/10.1093/nar/gkx254 |
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