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Quality control of spliced mRNAs requires the shuttling SR-proteins Gbp2 and Hrb1

ABSTRACT: Eukaryotic cells have to prevent the export of unspliced pre-mRNAs until intron removal is completed to avoid the expression of aberrant and potentially harmful proteins. Only mature RNAs associate with the export receptor Mex67 (mammalian TAP) and enter the cytoplasm. The underlying nuclear quality control mechanisms are still unclear. Here we show that two shuttling SR-proteins Gbp2 and Hrb1 are key surveillance factors for the selective export of spliced mRNAs in yeast. Their absence leads to the significant leakage of unspliced pre-mRNAs into the cytoplasm. They bind to pre-mRNAs and the spliceosome during splicing, where they are necessary for the surveillance of splicing and the stable binding of the TRAMP-complex to the spliceosome-bound transcripts. Faulty transcripts are marked for their degradation at the nuclear exosome. On correct mRNAs the SR-proteins recruit Mex67 upon completion of splicing to allow a quality controlled nuclear export. Altogether, these data identify a role for shuttling SR-proteins in mRNA surveillance and nuclear mRNA quality control. 6 samples, i.e. 2 replicates per protein Gbp2, Hrb1 and Npl3

ORGANISM(S): Saccharomyces cerevisiae

SUBMITTER: Klaus Jung

PROVIDER: E-GEOD-52808 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The shuttling SR-like proteins Gbp2 and Hrb1 mediate the nuclear export of spliced mRNAs

Project description:Three shuttling SR-like proteins exist in Saccharomyces cerevisiae, Npl3, Gbp2 and Hrb1, that are involved in the nuclear export of mRNAs. In a screen for genes that regulate the export of Gbp2, we identified novel mutants of the splicing factors PRP8 and PRP17 that lead to severe mislocalization defects for Gbp2 and Hrb1, but not Npl3. Microarray and qRT-PCR analyses show that Gbp2 and Hrb1 preferentially bind to transcripts derived from intron-containing genes. Moreover, in contrast to Npl3, Gbp2 and Hrb1 show genetic and physical interactions with late splicing factors such as Prp17 and Prp43. Further, RNA co-immunoprecipitation experiments reveal that, unlike Npl3, association of Gbp2 and Hrb1 with the mRNA requires splicing, and this in turn is required for their Mex67 recruitment. We propose a model in which Gbp2 and Hrb1 are attached to the mRNAs at late stages of splicing to promote the subsequent export of spliced mRNAs. keyword: RIP-chip RNA-IP of endogenously expressed 3-fold C-terminal myc-tagged Gbp2 and Hrb1 in S288C background cells was each performed once in cells grown to a density of 4x10^7 cells/ml and hybridized against a total (input) RNA reference.

2013-08-30 | E-GEOD-20738 | biostudies-arrayexpress

Quality control of spliced mRNAs requires the shuttling SR-proteins Gbp2 and Hrb1

Project description:Eukaryotic cells have to prevent the export of unspliced pre-mRNAs until intron removal is completed to avoid the expression of aberrant and potentially harmful proteins. Only mature RNAs associate with the export receptor Mex67 (mammalian TAP) and enter the cytoplasm. The underlying nuclear quality control mechanisms are still unclear. Here we show that two shuttling SR-proteins Gbp2 and Hrb1 are key surveillance factors for the selective export of spliced mRNAs in yeast. Their absence leads to the significant leakage of unspliced pre-mRNAs into the cytoplasm. They bind to pre-mRNAs and the spliceosome during splicing, where they are necessary for the surveillance of splicing and the stable binding of the TRAMP-complex to the spliceosome-bound transcripts. Faulty transcripts are marked for their degradation at the nuclear exosome. On correct mRNAs the SR-proteins recruit Mex67 upon completion of splicing to allow a quality controlled nuclear export. Altogether, these data identify a role for shuttling SR-proteins in mRNA surveillance and nuclear mRNA quality control.

2013-12-04 | GSE52808 | GEO

Identification of GBP2- and NAB2-interacting proteins in malaria parasites

Project description:The quality control and export of mRNA by RNA-binding proteins are necessary for the survival of malaria parasites, which have complex life cycles. Malarial nuclear poly(A) binding protein 2 (NAB2), ALWAYS EARLY (ALY) and serine/arginine-rich (SR) proteins, such as nucleolar protein 3 (NPL3), G-strand binding protein 2 (GBP2) and SR1, are involved in nuclear mRNA export in malaria parasites. However, their functions and cellular localization are not fully understood. In this study, we found that NAB2 and SR1, but not ALY, NPL3 or GBP2, played essential roles in the asexual development of malaria parasites, while GBP2 was involved in gametocyte production. Moreover, GBP2 localized to both the nucleus and cytoplasm of malaria parasites and interacted with the proteins ALBA4, DOZI and CITH, which play roles in translational repression. Our findings suggest that malarial GBP2 may be involved in the recruitment of ALBA4, DOZI and CITH. Immunoprecipitation coupled to mass spectrometry (IP-MS) revealed that PHAX domain-containing protein, an adaptor protein for exportin-1, also interacted with GBP2, suggesting that mRNA export occurs via the PHAX domain-containing protein pathway in malaria parasites. Fluorescence live cell imaging revealed that malarial NAB2 localized at the nuclear periphery and co-localized with NUP205. Moreover, using IP-MS, we found that malarial NAB2 interacted with transportin. RNA immunoprecipitation coupled to RNA sequencing revealed that malarial NAB2 bound directly to 143 mRNAs, including those encoding 40S and 60S ribosomal proteins. This indicates that malarial NAB2 is involved in general mRNA assembly and is shuttled between the nucleus and cytoplasm. Our findings suggest that unique mRNA export and post-transcriptional gene regulation mediated by RNA-binding proteins occur in malaria parasites.

2021-11-03 | PXD027302 | Pride

A single SR-like protein, Npl3, promotes pre-mRNA splicing in budding yeast

2008-12-31 | GSE11491 | GEO

A single SR-like protein, Npl3, promotes pre-mRNA splicing in budding yeast

Project description:Mammalian SR proteins are a family of reversibly phosphorylated RNA binding proteins primarily studied for their roles in alternative splicing. While budding yeast lack alternative splicing, they do have three SR-like proteins: Npl3, Gbp2, and Hrb1. However, these have been primarily studied for their roles in mRNA export, leaving their potential roles in splicing largely unexplored. Here we combined high-density genetic interaction profiling and genome-wide splicing-sensitive microarray analysis to demonstrate that a single SR-like protein, Npl3, is required for efficient splicing of a large set of pre-mRNAs in Saccharomyces cerevisiae. We tested the hypothesis that Npl3 promotes splicing by facilitating co-transcriptional recruitment of splicing factors. Using chromatin immunoprecipitation, we showed that mutation of NPL3 reduces the occupancy of U1 and U2 snRNPs at Npl3-stimulated genes. This provides the first evidence that an SR protein can promote recruitment of splicing factors to chromatin. Splicing-specific microarrays were used to assay changes to splicing in single and double deletion mutants of non-essential SR proteins, in a deletion mutant of a non-essential component of the nonsense-mediated decay pathway, and in a double deletion mutant of in an SR protein plus a non-sense mediated decay factor in Saccharomyces cerevisiae. The data includes both samples obtained at the permissive temperature and also shifts to the non-permissive temperature for some mutants, as well as dye-flipped technical replicates.

2008-12-30 | E-GEOD-11491 | biostudies-arrayexpress

Double stranded RNA formation leads to preferential nuclear export and gene expression

Project description:mRNAs are transcribed and processed in the nucleus before they are exported into the cytoplasm for translation. Export is mediated by the export receptor heterodimer Mex67-Mtr2 in yeast (TAP-p15 in humans). Interestingly, also many lncRNAs leave the nucleus but it is currently unclear why they travel into the cytoplasm. Here we show that antisense (as)RNAs accelerate mRNA export by annealing with their sense counterparts through the helicase Dbp2. These double-stranded (ds)RNAs dominate export compared to single-stranded (ss)RNA, as they have a higher capacity and affinity for the export receptor Mex67. In this way, asRNAs boost gene expression, which is beneficial for cells. This is particularly important upon expression program changes. Consequently, the degradation or prevention of the formation of dsRNA is toxic for cells. This mechanism illuminates the general cellular occurrence of asRNAs and explains their nuclear export.

2024-04-30 | GSE252951 | GEO

Mip6 binds directly to the Mex67 UBA domain to maintain low levels of Msn2/4 stress dependent mRNAs

Project description:RNA binding proteins (RBPs) participate in almost all steps of gene expression, underscoring their potential as key regulators of RNA homeostasis. We structurally and functionally characterized Mip6, a four-RNA Recognition Motif (RRM)-containing RBP, as a functional and physical interactor of the mRNA export factor Mex67. Mip6 directly interacts with the ubiquitin-associated (UBA) domain of Mex67 through tryptophan 442 of Mip6-RRM4, whose mutation leads to slow growth of yeast cells in vivo. Although Mip6-RRM4 binds to RNA in vitro, Mex67 UBA binding prevents Mip6-RRM4 interaction with RNA. Mip6 shuttles between the nucleus and the cytoplasm in a Mex67-dependent manner and concentrates in cytoplasmic foci under several stressors. Photoactivatable Ribonucleoside-Enhanced Crosslinking and Immunoprecipitation (PAR-CLIP) experiments showed preferential binding of Mip6 to mRNAs regulated by the stress-response Msn2/4 transcription factors. Consistent with this binding, MIP6 deletion affected their export and expression levels. These results reveal a novel role for Mip6 in the homeostasis of Msn2/4 dependent transcripts by its direct interaction with Mex67 UBA domain.

2019-08-29 | GSE126236 | GEO

Nuclear mRNA quality control is bypassed for rapid export of stress responsive transcripts (Microarray)

Project description:Comparative analyses of Mex67 and Npl3 binding to mRNA at normal growth condition (25Â°C) and upon shift to heat stress (30 min, 42Â°C). Comparative analyses of mRNA binding of Mex67, Npl3 and no tag control at normal growth condition (25Â°C) and upon heat stress (30 min, 42Â°C) via RNA Co-IP experiments. Respective co-purified mRNAs were subjected to cDNA Microarray chips.

2016-06-14 | E-GEOD-83267 | biostudies-arrayexpress

Double-stranded RNA formation leads to preferential nuclear export and gene expression

Project description:mRNAs are transcribed and processed in the nucleus before they are exported into the cytoplasm for translation. Export is mediated by the export receptor heterodimer Mex67-Mtr2 in yeast (TAP-p10 in humans). Interestingly, also long non-coding RNAs (lncRNAs) leave the nucleus and so-called XUTs (Xrn1 sensitive unstable transcripts) accumulate in the cytoplasm of the degradation defective xrn1∆ mutant. Curiously, it is currently unclear why so many lncRNAs travel into the cytoplasm. Here we show that such ncRNAs accelerate mRNA export by annealing with their sense counterparts through the helicase Dbp2. These double stranded (ds) RNAs dominate export, because Mex67 has a higher affinity to dsRNAs and more molecules bind. Cells benefit from this mechanism as it quickly regulates gene expression, which is particularly important upon expression program changes. Consequently, prevention of the dsRNA formation or destroying dsRNAs is lethal to cells. This mechanism could explain the general cellular occurrence of antisense RNAs.

2024-04-30 | GSE188455 | GEO

The Deubiquitylase Ubp15 Couples Transcription to mRNA Export

Project description:The nuclear export of messenger RNAs (mRNAs) is intimately coupled to their synthesis. pre-mRNAs assemble into dynamic ribonucleoparticles as they are being transcribed, processed and exported. The role of ubiquitylation in this process is increasingly recognized as the ubiquitylation of many key players have been shown to affect mRNA nuclear export. While a few E3 ligases have been shown to regulate nuclear export, evidence for deubiquitylases is currently lacking. Here, we identified the deubiquitylase Ubp15 as a regulator of nuclear export in Saccharomyces cerevisiae. Ubp15 interacts both with RNA polymerase II and with the nuclear pore complex, and its deletion reverts the nuclear export defect of mutants of the E3 ligase Rsp5. The deletion of UBP15 leads to hyper-ubiquitylation of the main nuclear export receptor Mex67 and affects its association with THO, a complex coupling transcription to mRNA processing and involved in the recruitment of mRNA export factors to nascent transcripts. Collectively, our data support a role for Ubp15 in coupling transcription to mRNA export.

2020-11-23 | GSE154671 | GEO

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