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Related Concept Videos

Amplifying Signals via Second Messengers01:15

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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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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Related Experiment Video

Updated: Jul 12, 2025

Using Microtiter Dish Radiolabeling for Multiple In Vivo Measurements Of Escherichia coli pppGpp Followed by Thin Layer Chromatography
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Crosstalk between (p)ppGpp and other nucleotide second messengers.

Danny K Fung1, Aude E Trinquier1, Jue D Wang1

  • 1Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA.

Current Opinion in Microbiology
|October 22, 2023
PubMed
Summary
This summary is machine-generated.

Bacteria use nucleotide messengers, like guanosine tetraphosphate (p)ppGpp, to adapt to their environment. New research reveals complex crosstalk between (p)ppGpp and other messengers, enabling fine-tuned cellular responses.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacteria utilize intracellular nucleotide messengers to control cellular processes and physiology in response to environmental changes.
  • Individual nucleotide messengers, such as (p)ppGpp and cyclic (di)nucleotides, have well-defined regulatory roles.
  • Emerging research highlights the interconnectedness of bacterial nucleotide signaling pathways.

Purpose of the Study:

  • To explore the crosstalk mechanisms between (p)ppGpp and other bacterial nucleotide messengers.
  • To understand how these crosstalks contribute to bacterial adaptation and cellular regulation.
  • To elucidate the physiological significance of interconnected nucleotide signaling networks.

Main Methods:

  • Review of existing literature on bacterial nucleotide signaling.
  • Analysis of studies investigating crosstalk between (p)ppGpp and other nucleotide messengers.
  • Integration of findings on signal conversion, allosteric regulation, and target competition.

Main Results:

  • Crosstalk mechanisms such as signal conversion, allosteric regulation, and target competition exist between (p)ppGpp and other nucleotide messengers.
  • These interactions indicate that (p)ppGpp is deeply integrated into various nucleotide signaling pathways.
  • (p)ppGpp exhibits intricate links with diverse nucleotide signaling pathways.

Conclusions:

  • Bacterial nucleotide signaling networks are complex, with significant crosstalk between different messengers.
  • (p)ppGpp plays a central role in coordinating cellular adaptation through its interactions with other nucleotide signals.
  • Understanding these crosstalks is crucial for comprehending bacterial physiology and adaptation strategies.