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Related Concept Videos

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...
MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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...
Diversity in Cell Signaling Responses01:22

Diversity in Cell Signaling Responses

The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
Graded and Abrupt Responses
Some signaling systems generate...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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

Updated: Jun 14, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

Multiple signals converge on a differentiation MAPK pathway.

Colin A Chavel1, Heather M Dionne, Barbara Birkaya

  • 1Department of Biological Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America.

Plos Genetics
|March 25, 2010
PubMed
Summary

Budding yeast filamentous growth involves integrating signals from multiple pathways. Researchers discovered that the MSB2 promoter acts as a central hub, coordinating these signals for a unified cellular response.

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Last Updated: Jun 14, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Temporal Quantification of MAPK Induced Expression in Single Yeast Cells
07:59

Temporal Quantification of MAPK Induced Expression in Single Yeast Cells

Published on: October 4, 2013

Area of Science:

  • Cellular signaling and signal transduction
  • Yeast genetics and molecular biology
  • Systems biology and network regulation

Background:

  • Signal transduction pathways must integrate information for coordinated cellular responses.
  • Filamentous growth in budding yeast is a complex differentiation process regulated by multiple signaling pathways.
  • Understanding how these pathways converge is crucial for deciphering cellular behavior.

Purpose of the Study:

  • To identify novel regulators of filamentous growth in budding yeast.
  • To investigate how different signaling pathways integrate to control the filamentous growth (FG) MAPK pathway.
  • To elucidate the role of Msb2p signaling in integrating global cellular signals.

Main Methods:

  • Developed and employed a novel 'secretion profiling' screen to measure Msb2p extracellular domain release.
  • Utilized complementary genomic collections for comprehensive screening.
  • Analyzed the regulatory roles of RAS, RIM101, OPI1, and RTG pathways, and the histone deacetylase Rpd3p(L).

Main Results:

  • Secretion profiling identified multiple pathways (RAS, RIM101, OPI1, RTG) essential for FG pathway activation.
  • The MSB2 promoter was identified as a convergence hub for signals regulating filamentous growth.
  • Histone deacetylase Rpd3p(L) positively regulates FG pathway activity by controlling MSB2 promoter accessibility.

Conclusions:

  • Multiple signaling pathways converge at the MSB2 promoter to regulate filamentous growth.
  • This convergence sensitizes and synchronizes the FG pathway with the global signaling network.
  • The study reveals a global regulatory hierarchy for filamentous growth, highlighting systems-level integration in cellular signaling.