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Related Concept Videos

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...
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...
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...
Repressible Operon: trp Operon01:21

Repressible Operon: trp Operon

The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...

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Related Experiment Video

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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

Optimal gene partition into operons correlates with gene functional order.

Alon Zaslaver1, Avi Mayo, Michal Ronen

  • 1Department of Molecular Cell Biology and Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Biology
|October 6, 2006
PubMed
Summary

Bacterial gene arrangement in operons can vary. This study reveals that separating co-regulated genes into multiple operons offers benefits through differential regulation, optimizing gene expression timing.

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Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
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Determination of the Optimal Chromosomal Location(s) for a DNA Element in Escherichia coli Using a Novel Transposon-mediated Approach
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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Gene arrangement into operons differs across bacterial species, with co-regulated genes sometimes found on single or multiple operons.
  • Existing theories explain operon formation for co-localization benefits like gene transfer and stoichiometry.
  • The reasons for separating co-regulated genes into multiple operons remain less understood.

Purpose of the Study:

  • To investigate the evolutionary advantages of separating co-regulated genes into multiple operons.
  • To propose and model the benefits of differential operon regulation for gene pathway organization.
  • To determine if gene arrangement reflects an evolutionary optimization problem.

Main Methods:

  • Developed a mathematical model to analyze the optimal distribution of genes into operons.
  • Balanced the costs of operon formation against the benefits of differential, temporally ordered gene regulation.
  • Validated model predictions using genomic data from 137 bacterial species.

Main Results:

  • The model predicts that genes within an operon are arranged sequentially, without skipping functional pathway steps.
  • Genomic analysis supports the prediction that operon structure reflects functional gene order.
  • Gene arrangement is influenced by evolutionary optimization, not solely by historical factors.

Conclusions:

  • Differential regulation of multiple operons provides benefits for co-regulated genes.
  • Bacterial gene arrangement represents a solution to an evolutionary optimization problem balancing regulation and gene organization.
  • Operon structure can be used to infer gene functional order across bacterial genomes.