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RNA polymerase II holoenzyme is a form of eukaryotic RNA polymerase II that is recruited to the promoters of protein-coding genes in living cells. [11] It consists of RNA polymerase II, a subset of general transcription factors , and regulatory proteins known as SRB proteins.
RNA polymerase II (also called RNAP II and Pol II) is an enzyme found in eukaryotic cells. It catalyzes the transcription of DNA to synthesize precursors of mRNA and most snRNA and microRNA . [ 3 ] [ 4 ] In humans, RNAP II consists of seventeen protein molecules (gene products encoded by POLR2A-L, where the proteins synthesized from POLR2C ...
Unlike prokaryotic RNA polymerase that initiates the transcription of all different types of RNA, RNA polymerase in eukaryotes (including humans) comes in three variations, each translating a different type of gene. A eukaryotic cell has a nucleus that separates the processes of transcription and translation.
Structure of eukaryotic RNA polymerase II (light blue) in complex with α-amanitin (red), a strong poison found in death cap mushrooms that targets this vital enzyme Eukaryotes have multiple types of nuclear RNAP, each responsible for synthesis of a distinct subset of RNA.
The positive transcription elongation factor, P-TEFb, is a multiprotein complex that plays an essential role in the regulation of transcription by RNA polymerase II (Pol II) in eukaryotes. [1] Immediately following initiation Pol II becomes trapped in promoter proximal paused positions on the majority of human genes (Figure 1).
The added complexity of generating a eukaryotic cell carries with it an increase in the complexity of transcriptional regulation. Eukaryotes have three RNA polymerases, known as Pol I, Pol II, and Pol III. Each polymerase has specific targets and activities, and is regulated by independent mechanisms.
[2] [3] Thus, activator proteins help to promote the binding of the RNA polymerase to the promoter. [2] [3] This is done through various mechanisms. Activators may bend the DNA in order to better expose the promoter so the RNA polymerase can bind more effectively. [3] Activators may make direct contact with the RNA polymerase and secure it to ...
5430 20020 Ensembl ENSG00000284832 ENSG00000181222 ENSMUSG00000005198 UniProt P24928 P08775 RefSeq (mRNA) NM_000937 NM_009089 NM_001291068 RefSeq (protein) NP_000928 NP_001277997 Location (UCSC) Chr 17: 7.48 – 7.51 Mb Chr 11: 69.62 – 69.65 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse DNA-directed RNA polymerase II subunit RPB1, also known as RPB1, is an enzyme that is encoded ...