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Related Concept Videos

Operon Model01:23

Operon Model

The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Structure of a Gene01:30

Structure of a Gene

A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...

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Related Experiment Video

Updated: Jun 1, 2026

Inducible T7 RNA Polymerase-mediated Multigene Expression System, pMGX
10:09

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Published on: June 27, 2017

Fundamental relationship between operon organization and gene expression.

Han N Lim1, Yeong Lee, Razika Hussein

  • 1Department of Integrative Biology, University of California, Berkeley, CA 94720, USA. hanlim@berkeley.edu

Proceedings of the National Academy of Sciences of the United States of America
|June 15, 2011
PubMed
Summary

Gene expression in bacterial operons increases with operon length and gene position, driven by enhanced translation during transcription. This fundamental relationship impacts genome organization and synthetic biology applications.

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Last Updated: Jun 1, 2026

Inducible T7 RNA Polymerase-mediated Multigene Expression System, pMGX
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Area of Science:

  • Molecular Biology
  • Genetics
  • Synthetic Biology

Background:

  • Operons, groups of genes transcribed together, are crucial in bacterial gene networks.
  • The precise relationship between operon organization and gene expression levels is not fully understood.

Purpose of the Study:

  • To investigate how operon organization influences gene expression in Escherichia coli.
  • To elucidate the mechanisms underlying the observed gene expression patterns.

Main Methods:

  • Construction and analysis of synthetic operons in Escherichia coli.
  • Experimental validation of translation's role in gene expression.
  • Quantitative analysis of transcription distance and gene expression correlation.

Main Results:

  • Gene expression increases with operon length and gene position (further from the operon's end).
  • Increased "transcription distance" allows more time for translation during transcription, boosting expression.
  • Translation initiation is sixfold higher during transcription than post-release, amplifying transcription distance effects.

Conclusions:

  • A fundamental link exists between operon architecture (number, length, gene order) and gene expression.
  • Findings offer insights into genome organization and provide practical tools for synthetic biology.
  • Operon structure significantly modulates gene expression through coupled transcription-translation mechanisms.