Genome-wide mapping of RNA Polymerase II binding sites
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE13008 | GEO | 2008/10/02
REPOSITORIES: GEO
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Project description:Protein coding genes and some of the non-coding RNA genes in eucaryotes are transcribed by RNA Polymerase II. A transcription machinery complex consists of RNA Pol II and many other proteins including transcription factors, activators and repressors of transcription. Pol II binding sites are found in actively transcribing genes and many which are not actively transcribing. For data usage terms and conditions, please refer to http://www.genome.gov/27528022 and http://www.genome.gov/Pages/Research/ENCODE/ENCODEDataReleasePolicyFinal2008.pdf Map binding sites of RNA Polymerase II in the genome of K562 & NB4 cells
2008-10-02 | E-GEOD-13008 | biostudies-arrayexpress
Project description:For transcription through chromatin, RNA polymerase (Pol) II associates with elongation factors (EFs). Here we show that many EFs crosslink to RNA emerging from transcribing Pol II in the yeast Saccharomyces cerevisiae. Most EFs crosslink preferentially to mRNAs, rather than unstable non-coding RNAs. RNA contributes to chromatin association of many EFs, including the Pol II serine 2 kinases Ctk1 and Bur1 and the histone H3 methyltransferases Set1 and Set2. The Ctk1 kinase complex binds RNA in vitro , consistent with direct EF-RNA interaction. Set1 recruitment to genes in vivo depends on its RNA recognition motifs (RRMs). These results strongly suggest that nascent RNA contributes to EF recruitment to transcribing Pol II. We propose that EF-RNA interactions facilitate assembly of the elongation complex on transcribed genes when RNA emerges from Pol II, and that loss of EF-RNA interactions upon RNA cleavage at the polyadenylation site triggers disassembly of the elongation complex.
2017-05-23 | GSE81822 | GEO
Project description:Many regulatory proteins and complexes have been identified which influence transcription by RNA polymerase (pol) II with a fine precision. In comparison, only a few regulatory proteins are known for pol III, which transcribes mostly house-keeping and non-coding RNAs. Yet, pol III transcription is precisely regulated under various stress conditions like starvation. We used proteomic approaches and pol III transcription complex components TFIIIC (Tfc6), pol III (Rpc128) and TFIIIB (Brf1) as baits to find identify the potential interactors through mass spectrometry-based proteomics. A large number of proteins were found in the interactome, which includes known chromatin modifiers, factors and regulators of transcription by pol I and pol II.
2019-01-02 | PXD003748 | Pride
Project description:RNA Polymerase II (Pol II) carries out transcription of both protein-coding and non-coding genes. Whereas Pol II initiation at protein-coding genes has been studied in detail, Pol II initiation at non-coding genes such as small nuclear RNA (snRNA) genes is not understood at the structural level. Here we study Pol II initiation at snRNA gene promoters and show that the snRNA-activating protein complex (SNAPc) enables DNA opening and transcription initiation independent of TFIIE and TFIIH in vitro. We then resolve cryo-EM structures of the SNAPc-containing Pol II preinitiation complex (PIC) assembled on U1 and U5 snRNA promoters. The core of SNAPc binds two turns of DNA and recognizes the snRNA promoter-specific proximal sequence element (PSE) located upstream of the TATA box-binding protein TBP. Two extensions of SNAPc called wing-1 and wing-2 bind TFIIA and TFIIB, respectively, explaining how SNAPc directs Pol II to snRNA promoters. Comparison of structures of closed and open promoter complexes elucidates TFIIH-independent DNA opening. These results provide the structural basis of Pol II initiation at non-coding RNA gene promoters.
2023-03-11 | PXD033638 | Pride
Project description:Ribosome biogenesis is a highly regulated multistep process that controls cell growth and proliferation. The first and key regulatory step of ribosome biogenesis is represented by the transcription of ribosomal RNA (rRNA) genes by RNA polymerase (pol) I in the nucleolus. Activity of RNA pol I is tightly regulated by interactions with many auxiliary factors that mediate promoter recognition and contribute to transcription initiation, elongation and termination. In this study we were able to identify by mass spectrometry some of the known components of the RNA pol I transcribing machinery, and at the same time we identify some novel interactors.
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Project description:Elongin is a hetero-trimeric elongation factor for RNA polymerase (Pol) II transcription that is conserved among metazoa. We solved three structures of human Elongin bound to transcribing Pol II using cryo-EM assisted by crosslinking mass spectrometry. The structures show that Elongin subunit ELOA binds the RPB2 side of Pol II and anchors the ELOB-8 ELOC subunit heterodimer. ELOA contains an N-terminal ‘latch’ that binds between the end of the RPB1 bridge helix and the funnel helices, thereby inducing a conformational change near the Pol II active center. The latch is strictly required for the elongation-stimulatory activity of Elongin, but not for its binding to Pol II, indicating that Elongin functions by allosterically influencing the conformational mobility of the active center. Structural comparisons show that Elongin binding to Pol II is incompatible with association of super elongation complex, the PAF1 complex, and RTF1, which also contains a latch element that stimulates Pol II.
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Project description:RNA polymerase II (Pol II) subunits are thought to be involved in various transcription-associated processes, but it is unclear whether they play different regulatory roles in modulating gene expression. Here, we performed nascent and mature transcript sequencing after the acute degradation of 12 mammalian Pol II subunits and profiled their genomic binding sites and protein interactomes to dissect their molecular functions. We found that Pol II subunits contribute differently to Pol II cellular localization and transcription process and preferentially regulate RNA processing (such as RNA splicing and 3’ end maturation). Genes sensitive to the depletion of different Pol II subunits tend to be involved in diverse biological functions and show different RNA half-lives. Sequences, associated protein factors, and RNA structures are correlated with Pol II subunit-mediated differential gene expression. These findings collectively suggest that the heterogeneity of Pol II and different genes appear to depend on some of the subunits.
2022-08-09 | PXD035866 |
Project description:RNA polymerase II (pol II) transcribes all protein-coding and many non-coding RNAs in the human genome. Pol II transcription initiation is governed by the Pre-Initiation Complex (PIC), which contains TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIH, pol II, and Mediator. After initiation, pol II enzymes typically pause after transcribing less than 100 bases, and paused polymerases represent a common regulatory intermediate. Accordingly, paused pol II has been implicated in enhancer function, development and homeostasis, and diseases ranging from cancer to viral pathogenesis. Precisely how pol II promoter-proximal pausing is enforced and regulated remains unclear; however, protein complexes such as NELF and DSIF increase pausing whereas the activity of CDK9 (P-TEFb complex) correlates with pause release. To address specific mechanistic questions about pol II pausing and its regulation, we reconstituted human pol II promoter-proximal pausing in vitro, entirely with purified factors (no extracts). As expected, NELF and DSIF increased pol II pausing in vitro, whereas P-TEFb promoted pause release. Unexpectedly, the PIC alone was sufficient to reconstitute pol II pausing, suggesting that pausing is an inherent property of the PIC. In agreement, pol II pausing was lost upon replacement of the TFIID complex with TATA-binding protein (TBP); moreover, pausing was dependent upon TFIID subunits TAF1 and TAF2. TAF1/2 bind genomic DNA downstream of the pol II initiation site, invoking a “complex interaction” model for pausing. Consistent with this model, PRO-Seq experiments revealed increased transcription upon acute depletion (t=60 min) of TAF1 and TAF2 in human cells, and pol II pausing was disrupted at thousands of genes. Similar results were obtained in TAF1-depleted Drosophila S2 cells. Collectively, these data establish the general transcription factor TFIID as a genome-wide regulator of pol II promoter-proximal pausing.
2020-05-28 | GSE132764 | GEO
Project description:CDK9 is a critical kinase required for the productive transcription of protein-coding genes by RNA polymerase II (pol II). As part of P-TEFb, CDK9 phosphorylates the carboxyl-terminal domain (CTD) of pol II and elongation factors, including SPT5, which allows pol II to elongate past the early elongation checkpoint (EEC) encountered soon after initiation. We show that, in addition to halting pol II at the EEC, loss of CDK9 activity causes premature termination of transcription across the last exon, loss of polyadenylation factors from chromatin, and loss of polyadenylation of nascent transcripts. Inhibition of the phosphatase PP2A abrogates the premature termination and loss of polyadenylation caused by CDK9 inhibition, indicating that this kinase/phosphatase pair regulates transcription elongation and RNA processing at the end of protein-coding genes. Our phosphoproteomic analyses after CDK9 inhibition, using either DRB or an analog-sensitive CDK9 cell line, confirm the splicing factor SF3B1 as an additional key target of this kinase. These results emphasize the important roles that CDK9 plays in coupling transcription elongation and termination to RNA maturation downstream of the EEC. As part of this project, we characterized the interactome of SF3B1 in HeLa cells in duplicate.
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Project description:The DNA damage response is an essential process for the survival of living cells. In a subset of stress-responsive genes in humans,Elongin controls transcription in response to multiple stimuli, such as DNA damage, oxidative stress, and heat shock. Yeast Elongin (Ela1-Elc1), along with Def1, is known to facilitate ubiquitylation and degradation of RNA polymerase II (pol II) in response tomultiple stimuli, yet transcription activity has not been examined. We have found that Def1 copurifies from yeast whole-cell extract with TFIIH,the largest general transcription factor required for transcription initiation and nucleotide excision repair. The addition of recombinant Def1 and Ela1-Elc1 enhanced transcription initiation in an in vitro reconstituted system including pol II, the general transcription factors, and TFIIS. Def1 also enhanced transcription restart from TFIIS-induced cleavage in a pol II transcribing complex. In the Δdef1 strain, heat shock genes were misregulated, indicating that Def1 is required for induction of some stress-responsive genes in yeast. Taken together, our results extend the understanding of the molecular mechanism of transcription regulation on cellular stress and reveal functional similarities to the mammalian system.
2018-10-22 | PXD008223 | Pride