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Related Concept Videos

Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Transcriptional Regulation: Riboswitches01:23

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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General Transcription Factors01:30

General Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Operons02:09

Operons

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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...
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Functional modules of sigma factor regulons guarantee adaptability and evolvability.

Sebastian C Binder1, Denitsa Eckweiler2,3, Sebastian Schulz2,3

  • 1Department of Systems Immunology and Braunschweig Integrated Centre of Systems Biology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany.

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Alternative sigma factor regulons in Pseudomonas aeruginosa act as functional modules for adaptation and survival. Their modular organization enhances robustness and facilitates evolution, crucial for biological network evolvability.

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Area of Science:

  • Molecular Biology
  • Systems Biology
  • Microbial Pathogenesis

Background:

  • Modern molecular biology increasingly focuses on gene expression and regulation of molecular sets.
  • Understanding complex biological organization is key to adaptation and survival.

Purpose of the Study:

  • To investigate the role of alternative sigma factor regulons in Pseudomonas aeruginosa.
  • To determine if these regulons represent insulated functional modules.
  • To analyze the impact of network structure on adaptation and evolution.

Main Methods:

  • Analysis of the sigma factor network's operational state.
  • In silico testing of transcription factor evolution with consideration of network structure.

Main Results:

  • Alternative sigma factor regulons function as insulated modules for adaptation and survival.
  • Transcription factors couple regulons and modulate gene expression under stress.
  • Network structure accelerates and robustifies transcription factor evolution.

Conclusions:

  • Modular organization of sigma factor regulons provides robustness and facilitates evolution in P. aeruginosa.
  • Modularity in biological networks is essential for robustness and drives evolvability.