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RNA polymerase

ABSTRACT: RNA polymerase

PROVIDER: PRJNA202214 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR847728.fastq.gz	Fastqsanger.gz
	SRR847729.fastq.gz	Fastqsanger.gz
	SRR847730.fastq.gz	Fastqsanger.gz
	SRR847731.fastq.gz	Fastqsanger.gz
	SRR847732.fastq.gz	Fastqsanger.gz

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Project description:The interactions between RNA polymerase and ribosomes are critical for the coordination of transcription with translation. We report that RNA polymerase directly binds ribosomes and isolated large and small ribosomal subunits.

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Structure of the Plant Plastid-Encoded RNA Polymerase

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RNA polymerase III interactome

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.

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RNA polymerase II Immunoprecipitation from Arabidopsis LC-MSMS

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Project description:During eukaryotic transcription, RNA polymerase II undergoes dynamic post-translational modification on the C-terminal domain (CTD) of the largest subunit , generating a sophisticated PTM landscape for the spatiotemporal recruitment to transcriptional regulators. To delineate the protein interactomes recruited to Pol II at different stages of transcription, we in vitro reconstructed phosphorylation patterns of the CTD at Ser5 and Ser2 positions, the hallmark phosphorylation at the initation and productive elongation stages of transcription, respectively. Distinctive protein interactomes indicates different proteins are recruited to RNA polymerase II at different stages of transcription by the phosphorylation of Ser2 and Ser5 of the CTD heptads. Calcium Homeostasis Endoplasmic Reticulum Protein (CHERP) specifically binds to the Ser2 of the heptad. The loss of the interaction between CHERP and Pol II results in broad alternative splicing events. Our method points to a new method to distinguish the PTM codes that coordinate the transcription process.

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KINETIC AND COMPOSITIONAL ANALYSIS OF RNA POLYMERASE II IN TRYPANOSOMA BRUCEI

Project description:Genome-wide analysis of nascent RNA synthesis gives kinetic information on the transcriptional status of RNA polymerase II (Pol II). In parallel, immunoprecipitation of the largest subunit of Pol II (RPB1) provides the protein composition of the enzyme complex in the presence or absence of the transcriptional inhibitor Actinomycin D.

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Project description:There are about 600 loci in the mammalian genome that are annotated as RNA polymerase III genes. These comprise tRNA genes, the genes encoding 5S RNA, the smallest ribosomal RNA, and genes encoding catalytic or structural RNAs involved in processes as diverse as RNA processing or transcription elongation. Most RNA polymerase III genes have similar promoter structures, yet they are transcribed with different efficiencies. Here we have explored how RNA polymerase III occupancy of these genomic loci varies in a normal tissue, the liver, during the transition from a resting state to a proliferating state. We find that after partial hepatectomy, which causes synchronous entry of remaining liver cells into the cell division cycle, there is a tremendous increase in RNA polymerase III occupancy. This increase is, however, not uniform and concerns mostly loci that were lowly occupied by RNA polymerase III in resting liver. The changes in RNA polymerase III occupancy cannot be correlated with changes in RNA polymerase II occupancy around the RNA polymerase III loci nor at nearby RNA polymerase II promoters. RNA polymerase III loci with the largest fold change tend to be located in clusters, with the cluster displaying the largest changes located on chromosome 13. This suggests that increases in RNA polymerase III occupancy during the transition from resting to proliferating state affect mostly genes whose basal rate of transcription is relatively low and which are located in clusters.

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