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Related Concept Videos

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...
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...
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...
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...
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...

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Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
08:54

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Published on: March 20, 2016

Challenges ahead in signal transduction: MAPK as an example.

Christina Kiel1, Luis Serrano

  • 1EMBL/CRG Systems Biology Research Unit, Centre for Genomic Regulation (CRG), UPF, Barcelona, Dr. Aiguader 88, 08003 Barcelona, Spain. christina.kiel@crg.eu

Current Opinion in Biotechnology
|November 1, 2011
PubMed
Summary

Signal transduction converts external signals into cellular functions. This study examines challenges in understanding receptor/MAPK signaling, including scaffolds, concentration, and alternative splicing integration.

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Systems Biology

Background:

  • Signal transduction is crucial for cellular functions, converting stimuli into diverse responses.
  • Recent advances include pathway identification, cross-talk analysis, and spatial-temporal dynamics.

Purpose of the Study:

  • To discuss current and remaining challenges in understanding signal transduction.
  • To use the receptor/MAPK signaling system as a model for these challenges.

Main Methods:

  • Review of recent progress in signal transduction research.
  • Focus on the receptor/MAPK signaling pathway as an illustrative example.
  • Discussion of key challenges and future directions.

Main Results:

  • Identified challenges include the role of scaffolds, concentration dynamics, and structural information.
  • Highlighted the need to integrate large-scale proteomic data.
  • Emphasized the future challenge of incorporating alternative splicing into signaling pathways.

Conclusions:

  • Understanding signal transduction requires addressing complex factors like molecular organization and data integration.
  • Future research must incorporate alternative splicing for a comprehensive view of signaling pathways.