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HMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE77641 | GEO | 2017/12/06

SECONDARY ACCESSION(S): PRJNA311068

REPOSITORIES: GEO

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hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export VI

Project description:To examine whether the competition between hMTR4 with ALYREF is important for the specific exosome recruitment, we performed stranded RNA-seq using rRNA-depleted nuclear RNAs isolated from ALYREF and control overexpression cells.

2017-12-06 | GSE100982 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export V

Project description:To examine whether the competition between hMTR4 with AlyREF is important for the specific exosome recruitment,we sequenced the RNAs associating with hMTR4 in control and AlyREF overexpression cells.

2017-12-06 | GSE100606 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export III

Project description:To eliminate the possibility that for a particular gene the increased RNA level is an effect of enhanced transcription. We carried out ChIP-seq for RNAPII to compare transcription of mRNAs and lncRNAs in control, hRRP40 and hMTR4 knockdown cells. Among 15000 RNAPII binding peaks identified in these samples, only less than 50 peaks was significantly increased in hRRP40 or hMTR4 knockdown cells.

2017-12-06 | GSE77640 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export II

Project description:To define the in vivo targets of the human nuclear exosome, we performed stranded RNA-seq using polyA RNAs isolated from nuclei of HeLa cells. To compare the RNA levels in each sample in an unbiased fashion, we added spike-in controls to equal amount of total nuclear RNAs.

2017-12-06 | GSE77639 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export I

Project description:To define the in vivo targets of the human nuclear exosome, we performed stranded RNA-seq using rRNA-depleted RNAs isolated from nuclei of HeLa cells. To compare the RNA levels in each sample in an unbiased fashion, we added spike-in controls to equal amount of total nuclear RNAs.

2017-12-06 | GSE77638 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export IV

Project description:To define the in vivo targets of the human nuclear exosome, we performed stranded RNA-seq using rRNA-depleted RNAs isolated from HeLa cells.

2018-07-09 | GSE89123 | GEO

hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export

Project description:hMTR4 plays a central role in creating balanced nuclear RNA pools for degradation and export

| PRJNA311068 | ENA

Exosome cofactor hMTR4 competes with export adaptor ALYREF to ensure balanced nuclear RNA pools for degradation and export.

Project description:The exosome is a key RNA machine that functions in the degradation of unwanted RNAs. Here, we found that significant fractions of precursors and mature forms of mRNAs and long noncoding RNAs are degraded by the nuclear exosome in normal human cells. Exosome-mediated degradation of these RNAs requires its cofactor hMTR4. Significantly, hMTR4 plays a key role in specifically recruiting the exosome to its targets. Furthermore, we provide several lines of evidence indicating that hMTR4 executes this role by directly competing with the mRNA export adaptor ALYREF for associating with ARS2, a component of the cap-binding complex (CBC), and this competition is critical for determining whether an RNA is degraded or exported to the cytoplasm. Together, our results indicate that the competition between hMTR4 and ALYREF determines exosome recruitment and functions in creating balanced nuclear RNA pools for degradation and export.

| S-EPMC5623860 | biostudies-other

Role of nuclear pools of aminoacyl-tRNA synthetases in tRNA nuclear export.

Project description:Reports of nuclear tRNA aminoacylation and its role in tRNA nuclear export (Lund and Dahlberg, 1998; Sarkar et al., 1999; Grosshans et al., 20001) have led to the prediction that there should be nuclear pools of aminoacyl-tRNA synthetases. We report that in budding yeast there are nuclear pools of tyrosyl-tRNA synthetase, Tys1p. By sequence alignments we predicted a Tys1p nuclear localization sequence and showed it to be sufficient for nuclear location of a passenger protein. Mutations of this nuclear localization sequence in endogenous Tys1p reduce nuclear Tys1p pools, indicating that the motif is also important for nucleus location. The mutations do not significantly affect catalytic activity, but they do cause defects in export of tRNAs to the cytosol. Despite export defects, the cells are viable, indicating that nuclear tRNA aminoacylation is not required for all tRNA nuclear export paths. Because the tRNA nuclear exportin, Los1p, is also unessential, we tested whether tRNA aminoacylation and Los1p operate in alternative tRNA nuclear export paths. No genetic interactions between aminoacyl-tRNA synthetases and Los1p were detected, indicating that tRNA nuclear aminoacylation and Los1p operate in the same export pathway or there are more than two pathways for tRNA nuclear export.

| S-EPMC34591 | biostudies-literature

Central role of the oxygen-dependent degradation domain of Drosophila HIFalpha/Sima in oxygen-dependent nuclear export.

Project description:The Drosophila HIFalpha homologue, Sima, is localized mainly in the cytoplasm in normoxia and accumulates in the nucleus upon hypoxic exposure. We have characterized the mechanism governing Sima oxygen-dependent subcellular localization and found that Sima shuttles continuously between the nucleus and the cytoplasm. We have previously shown that nuclear import depends on an atypical bipartite nuclear localization signal mapping next to the C-terminus of the protein. We show here that nuclear export is mediated in part by a CRM1-dependent nuclear export signal localized in the oxygen-dependent degradation domain (ODDD). CRM1-dependent nuclear export requires both oxygen-dependent hydroxylation of a specific prolyl residue (Pro850) in the ODDD, and the activity of the von Hippel Lindau tumor suppressor factor. At high oxygen tension rapid nuclear export of Sima occurs, whereas in hypoxia, Sima nuclear export is largely inhibited. HIFalpha/Sima nucleo-cytoplasmic localization is the result of a dynamic equilibrium between nuclear import and nuclear export, and nuclear export is modulated by oxygen tension.

| S-EPMC2735486 | biostudies-literature

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