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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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Because many receptor binding ligands are hydrophilic, they do not cross the cell membrane and thus their message must be relayed to a second messenger on the inside. There are several second messenger pathways, each with their own way of relaying information. G-protein coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol path is active when the receptor induces phospholipase C to hydrolyze the phospholipid,...
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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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Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Related Experiment Video

Updated: Jan 19, 2026

From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes T&#252;6028
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Nucleotide second messengers in Streptomyces.

Andreas Latoscha1, Mirka E Wörmann1, Natalia Tschowri1

  • 1Department of Biology / Microbiology, Humboldt-Universität zu Berlin, 10115 Berlin, Germany.

Microbiology (Reading, England)
|September 20, 2019
PubMed
Summary

Streptomyces use nucleotide second messengers like cyclic AMP to control development and antibiotic production. This review details enzymes involved in these signaling pathways, guiding future research.

Keywords:
(p)ppGppStreptomycesc-di-AMPc-di-GMPcAMP

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Streptomyces are crucial antibiotic producers.
  • Environmental signals trigger complex developmental changes in Streptomyces.
  • Nucleotide second messengers regulate these transitions.

Purpose of the Study:

  • To review enzymes synthesizing and degrading key second messengers in Streptomyces.
  • To identify potential targets for future research on Streptomyces signaling.
  • To elucidate the role of second messengers in Streptomyces development and secondary metabolism.

Main Methods:

  • Literature review of enzymes involved in nucleotide second messenger metabolism.
  • Analysis of signaling pathways and target molecules.
  • Identification of candidate enzymes for further study.

Main Results:

  • Overview of enzymes responsible for the synthesis and degradation of (p)ppGpp, cAMP, c-di-GMP, and c-di-AMP.
  • Highlighting target molecules that bind these second messengers.
  • Discussion of the specific functions controlled by these signaling molecules in Streptomyces development.

Conclusions:

  • Nucleotide second messengers are critical regulators of Streptomyces development and antibiotic production.
  • Further investigation into specific enzymes and their targets will advance understanding of these pathways.
  • Open questions remain, offering avenues for future research in Streptomyces signaling.