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Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Related Experiment Video

Updated: Oct 15, 2025

A Fast and Reliable Pipeline for Bacterial Transcriptome Analysis Case study: Serine-dependent Gene Regulation in Streptococcus pneumoniae
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The Effect of Impaired Polyamine Transport on Pneumococcal Transcriptome.

Mary F Nakamya1, Moses B Ayoola1, Leslie A Shack1

  • 1Department of Comparative Biomedical Sciences, College of Veterinary Medicine, Mississippi State University, Starkville, MS 39762, USA.

Pathogens (Basel, Switzerland)
|October 23, 2021
PubMed
Summary

Targeting polyamine transport in Streptococcus pneumoniae offers a novel therapeutic strategy. Disrupting this transport impacts virulence, reducing stress resistance and capsule production, thereby attenuating the pathogen.

Keywords:
Streptococcus pneumoniaemetabolomenitrosative stressoxidative stresspolyamine transportertranscriptome

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Pathogen Physiology

Background:

  • Streptococcus pneumoniae infections cause significant global mortality.
  • Current vaccines have limitations in serotype coverage and antibiotic resistance is a growing concern.
  • Understanding pneumococcal adaptation mechanisms is crucial for developing new therapies.

Purpose of the Study:

  • To investigate the physiological impact of polyamine transport deficiency (ΔpotABCD) in Streptococcus pneumoniae.
  • To characterize the transcriptome, metabolome, and stress responses of the mutant strain.
  • To evaluate polyamine transport as a potential therapeutic target.

Main Methods:

  • Comparative transcriptomic and metabolomic analysis of wild-type and ΔpotABCD S. pneumoniae strains.
  • Assessment of stress responses (oxidative and nitrosative) in the mutant.
  • Analysis of metabolic pathway alterations, including nucleotide sugar and pentose phosphate pathways.

Main Results:

  • ΔpotABCD mutant showed reduced expression of oxidative stress response genes and nucleotide sugar metabolism.
  • Increased expression of Leloir, tagatose, and pentose phosphate pathways observed in the mutant.
  • Lower levels of glutathione and pyruvate, and increased susceptibility to oxidative and nitrosative stress were noted in ΔpotABCD.

Conclusions:

  • Polyamine transport is vital for S. pneumoniae physiology and virulence.
  • Metabolic shifts in the mutant limit capsule polysaccharide precursor synthesis.
  • Targeting polyamine transport presents a promising novel therapeutic avenue against pneumococcal infections.