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Bacterial Transcription

Bacterial Transcription

RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:

Transcription in Prokaryotes

Transcription in Prokaryotes

Transcription is a highly regulated process that converts genetic information into RNA molecules. The transcription cycle is divided into three key stages: initiation, elongation, and termination, each driven by specific molecular mechanisms.Initiation of TranscriptionIn bacteria, transcription begins when the RNA polymerase core enzyme associates with a sigma factor to form a holoenzyme. For example, the E. coli sigma factor called σ70 forms a holoenzyme, which recognizes the -10 (Pribnow...

Eukaryotic Transcription Activators

Eukaryotic Transcription Activators

Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
The binding domains are capable of recognizing and interacting with regulatory sequences on the DNA. These...

Transcription Elongation Factors

Transcription Elongation Factors

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...

Transcription Elongation Factors

Transcription Elongation Factors

Eukaryotic Transcription Inhibitors

Eukaryotic Transcription Inhibitors

Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
Eukaryotic transcription inhibitors usually contain two distinct domains, a...

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Related Experiment Video

Updated: Jan 4, 2026

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Published on: September 13, 2018

Eukaryotic Transcription Turns 50.

Patrick Cramer¹

¹Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany.

|November 2, 2019

Summary

This year marks 50 years since the discovery of eukaryotic RNA polymerases. Research into gene transcription mechanisms continues to impact developmental, stem cell, and cancer biology.

Area of Science:

Molecular Biology
Genetics
Biochemistry

Background:

The discovery of three eukaryotic RNA polymerases in 1969 was a landmark event.
Gene transcription is a fundamental process in all living organisms.

Observation:

Researchers have dedicated 50 years to unraveling the complexities of gene transcription.
The field of transcription continues to yield significant insights.

Findings:

The intricate mechanisms of eukaryotic gene transcription are still under intense investigation.
Eukaryotic RNA polymerases play crucial roles in cellular processes.

Implications:

Understanding transcription is vital for fields such as developmental biology.

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Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on TRO Approach

Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on TRO Approach

Published on: March 12, 2017

Single-Molecule Imaging of EWS-FLI1 Condensates Assembling on DNA

Single-Molecule Imaging of EWS-FLI1 Condensates Assembling on DNA

Published on: September 8, 2021

Related Experiment Videos

Last Updated: Jan 4, 2026

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms

Published on: September 13, 2018

Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on TRO Approach

Analysis of Termination of Transcription Using BrUTP-strand-specific Transcription Run-on TRO Approach

Published on: March 12, 2017

Single-Molecule Imaging of EWS-FLI1 Condensates Assembling on DNA

Single-Molecule Imaging of EWS-FLI1 Condensates Assembling on DNA

Published on: September 8, 2021

Advances in transcription research impact stem cell biology and cancer studies.

Continued exploration of RNA polymerases promises further breakthroughs.