snRNA 3' End Processing by a CPSF73-Containing Complex Essential for Development in Arabidopsis

Uridine-rich small nuclear RNAs (snRNAs) are the basal components of the spliceosome and play essential roles in splicing. The biogenesis of the majority of snRNAs involves 3' end endonucleolytic cleavage of the nascent transcript from the elongating DNA-dependent RNA ploymerase II. However, th...

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Veröffentlicht in:PLoS biology 2016-10, Vol.14 (10), p.e1002571-e1002571
Hauptverfasser: Liu, Yunfeng, Li, Shengjun, Chen, Yuan, Kimberlin, Athen N, Cahoon, Edgar B, Yu, Bin
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Li, Shengjun
Chen, Yuan
Kimberlin, Athen N
Cahoon, Edgar B
Yu, Bin
description Uridine-rich small nuclear RNAs (snRNAs) are the basal components of the spliceosome and play essential roles in splicing. The biogenesis of the majority of snRNAs involves 3' end endonucleolytic cleavage of the nascent transcript from the elongating DNA-dependent RNA ploymerase II. However, the protein factors responsible for this process remain elusive in plants. Here, we show that DEFECTIVE in snRNA PROCESSING 1 (DSP1) is an essential protein for snRNA 3' end maturation in Arabidopsis. A hypomorphic dsp1-1 mutation causes pleiotropic developmental defects, impairs the 3' end processing of snRNAs, increases the levels of snRNA primary transcripts (pre-snRNAs), and alters the occupancy of Pol II at snRNA loci. In addition, DSP1 binds snRNA loci and interacts with Pol-II in a DNA/RNA-dependent manner. We further show that DSP1 forms a conserved complex, which contains at least four additional proteins, to catalyze snRNA 3' end maturation in Arabidopsis. The catalytic component of this complex is likely the cleavage and polyadenylation specificity factor 73 kDa-I (CSPF73-I), which is the nuclease cleaving the pre-mRNA 3' end. However, the DSP1 complex does not affect pre-mRNA 3' end cleavage, suggesting that plants may use different CPSF73-I-containing complexes to process snRNAs and pre-mRNAs. This study identifies a complex responsible for the snRNA 3' end maturation in plants and uncovers a previously unknown function of CPSF73 in snRNA maturation.
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The catalytic component of this complex is likely the cleavage and polyadenylation specificity factor 73 kDa-I (CSPF73-I), which is the nuclease cleaving the pre-mRNA 3' end. However, the DSP1 complex does not affect pre-mRNA 3' end cleavage, suggesting that plants may use different CPSF73-I-containing complexes to process snRNAs and pre-mRNAs. 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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: . PLoS Biol 14(10): e1002571. doi:10.1371/journal.pbio.1002571</rights><rights>2016 Liu et al 2016 Liu et al</rights><rights>2016 Public Library of Science. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: . 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The biogenesis of the majority of snRNAs involves 3' end endonucleolytic cleavage of the nascent transcript from the elongating DNA-dependent RNA ploymerase II. However, the protein factors responsible for this process remain elusive in plants. Here, we show that DEFECTIVE in snRNA PROCESSING 1 (DSP1) is an essential protein for snRNA 3' end maturation in Arabidopsis. A hypomorphic dsp1-1 mutation causes pleiotropic developmental defects, impairs the 3' end processing of snRNAs, increases the levels of snRNA primary transcripts (pre-snRNAs), and alters the occupancy of Pol II at snRNA loci. In addition, DSP1 binds snRNA loci and interacts with Pol-II in a DNA/RNA-dependent manner. We further show that DSP1 forms a conserved complex, which contains at least four additional proteins, to catalyze snRNA 3' end maturation in Arabidopsis. The catalytic component of this complex is likely the cleavage and polyadenylation specificity factor 73 kDa-I (CSPF73-I), which is the nuclease cleaving the pre-mRNA 3' end. However, the DSP1 complex does not affect pre-mRNA 3' end cleavage, suggesting that plants may use different CPSF73-I-containing complexes to process snRNAs and pre-mRNAs. This study identifies a complex responsible for the snRNA 3' end maturation in plants and uncovers a previously unknown function of CPSF73 in snRNA maturation.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>27780203</pmid><doi>10.1371/journal.pbio.1002571</doi><orcidid>https://orcid.org/0000-0002-4166-9056</orcidid><oa>free_for_read</oa></addata></record>
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subjects Arabidopsis
Arabidopsis - genetics
Arabidopsis - growth & development
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
Biology and Life Sciences
Cleavage And Polyadenylation Specificity Factor - metabolism
Colleges & universities
Deoxyribonucleic acid
Development
DNA
Gene expression
Genes, Plant
Genetic aspects
Methods
Mutation
Plant sciences
Plants
Pollen
Proteins
Research and Analysis Methods
RNA Processing, Post-Transcriptional
RNA sequencing
RNA, Small Nuclear - genetics
RNA, Small Nuclear - metabolism
title snRNA 3' End Processing by a CPSF73-Containing Complex Essential for Development in Arabidopsis
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