Rna Polymerase Ii Elongation
Rna Polymerase Ii Elongation - Related Videos
00:58
Eukaryotic RNA Polymerases
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2025
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action. All three eukaryotic RNAPs require specific transcription factors, of which the...
00:43
Bacterial RNA Polymerase
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2020
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity. In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
10:59
Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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Cited by 1 •
2019
Here, we describe the assembly of RNA polymerase II (Pol II) elongation complexes requiring only short synthetic DNA and RNA oligonucleotides and purified Pol II. These complexes are useful for studying mechanisms underlying co-transcriptional processing of transcripts associated with the Pol II elongation complex.
02:35
Transcription Elongation Factors
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2020
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene. The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
02:36
RNA Polymerase II Accessory Proteins
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2020
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
FAQs
Pausing and backtracking create regulated interruptions in polymerase movement rather than allowing uninterrupted RNA synthesis. Together with changes in elongation rate, these events can influence how efficiently a gene is transcribed and how transcription remains coordinated with downstream RNA-processing activities. Their regulation therefore provides cells with control points for adjusting gene expression beyond promoter initiation.
Elongation-associated factors help regulate the polymerase as it advances along the DNA template. Their effects include controlling pausing, backtracking, and the overall elongation rate, allowing transcription to respond to cellular requirements. Because these factors act during ongoing synthesis, they connect polymerase behavior with the accuracy and timing of gene expression.
The elongation stage provides a setting in which RNA synthesis can be coordinated with co-transcriptional RNA processing. As the nascent RNA is produced, regulation of polymerase movement can influence the timing of RNA splicing and 3′-end formation. This coordination helps connect the progress of transcription with the maturation steps needed for accurate gene expression.
Investigating this stage reveals that gene regulation depends on more than whether transcription starts at a promoter. Polymerase pausing, backtracking, elongation rate, and associated regulatory factors can all shape the final transcriptional outcome. Examining these features helps explain how cells achieve accurate gene expression while controlling transcription after initiation has occurred.
Cells can use regulation during elongation to adjust gene expression as developmental programs or environmental conditions change. Modifying polymerase progression and its associated regulatory processes provides control during transcription after initiation. This makes elongation relevant to understanding how cellular gene-expression patterns are reshaped in response to changing biological signals.
Defects in RNA polymerase II elongation can disrupt the regulation of gene expression and interfere with coordination between transcription and RNA processing. Such changes may alter the production or maturation of cellular RNAs. Studying these defects provides a framework for investigating how abnormal transcriptional control contributes to disease-associated changes in cell function.