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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...
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...
Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...
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...
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...

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A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
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Transcript analysis of the Halothiobacillus neapolitanus cso operon.

Fei Cai1, Sabine Heinhorst, Jessup M Shively

  • 1Department of Chemistry and Biochemistry, The University of Southern Mississippi, Hattiesburg, MS 39406-0001, USA.

Archives of Microbiology
|September 28, 2007
PubMed
Summary

This study investigates the transcriptional regulation of carboxysome genes in Halothiobacillus neapolitanus. It confirms these genes form an operon and identifies potential regulatory mechanisms for protein expression levels.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Carboxysomes are essential protein shells in autotrophic bacteria, concentrating carbon dioxide for the enzyme RuBisCO.
  • The genes encoding carboxysome proteins are organized in a cluster, presumed to function as an operon (cso operon).

Purpose of the Study:

  • To systematically investigate the transcriptional regulation of carboxysome protein expression.
  • To confirm the operon structure of the cso gene cluster in Halothiobacillus neapolitanus.
  • To explore regulatory mechanisms influencing differential expression of carboxysome proteins.

Main Methods:

  • Transcriptional analysis using quantitative methods to measure cso operon transcript levels.
  • Comparative genomic analysis to support the operon hypothesis.
  • Analysis of transcript 5' and 3' ends, and examination of potential regulatory sequences and secondary structures.

Main Results:

  • All genes within the cso operon of Halothiobacillus neapolitanus are transcribed, but at varying levels.
  • Evidence supports the cso gene cluster functioning as a single transcriptional unit (operon).
  • Identification of potential regulatory elements and secondary structures within the operon.

Conclusions:

  • The cso gene cluster in H. neapolitanus operates as an operon.
  • Differential transcript levels suggest complex regulatory strategies governing carboxysome protein stoichiometry.
  • Further research into regulatory sequences and structures can elucidate mechanisms for carboxysome assembly.