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Related Concept Videos

Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

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...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...

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Related Experiment Video

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Monitoring Kinase and Phosphatase Activities Through the Cell Cycle by Ratiometric FRET
13:38

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Published on: January 27, 2012

The Rcs phosphorelay: more than just a two-component pathway.

David J Clarke1

  • 1Department of Microbiology & Alimentary Pharmabiotic Centre, University College Cork, Ireland. david.clarke@ucc.ie

Future Microbiology
|August 21, 2010
PubMed
Summary

The Rcs phosphorelay, a bacterial signaling pathway involving RcsC, RcsD, and RcsB proteins, regulates virulence and biofilm formation. This review explores its inputs, outputs, and role in bacterial adaptation.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Signaling

Background:

  • The Rcs phosphorelay is a complex signaling system present in Enterobacteriaceae.
  • It involves three core proteins (RcsC, RcsD, RcsB) and accessory proteins.
  • This pathway modulates cellular responses to environmental cues.

Purpose of the Study:

  • To discuss the inputs and outputs of the Rcs phosphorelay.
  • To present a model for the pathway's role in bacterial processes.
  • To highlight the pathway's significance in virulence and biofilm formation.

Main Methods:

  • Literature review of Rcs phosphorelay research.
  • Analysis of protein interactions and regulatory mechanisms.
  • Model development for pathway function.

Main Results:

  • Detailed description of Rcs phosphorelay components and their interactions.
  • Identification of diverse inputs and outputs influencing the pathway.
  • Proposed model linking Rcs signaling to temporal control of virulence and biofilm.

Conclusions:

  • The Rcs phosphorelay is a key regulator of bacterial adaptation.
  • It plays a crucial role in controlling Salmonella virulence and E. coli biofilm formation.
  • Further research into this pathway can reveal novel therapeutic targets.