Related Experiment Video

Updated: Jul 7, 2026

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

The detection of MAPK signaling

Yoav Shaul1, Rony Seger

  • 1Department of Biological Regulation, The Weizmann Institute of Science, Rehovot, Israel.

Current Protocols in Cell Biology
|January 30, 2008
PubMed

Insights

Mitogen-activated protein kinase (MAPK) cascades transmit extracellular signals via sequential protein kinase activation. Detecting MAPK activation involves analyzing phosphorylation states and kinase activities using methods like immunoblotting.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • Mitogen-activated protein kinase (MAPK) cascades are crucial for intracellular signal transduction.
  • These pathways involve sequential activation of protein kinases through phosphorylation.
  • Understanding MAPK activation is key to deciphering cellular responses to external stimuli.

Purpose of the Study:

  • To outline methods for detecting the activation of Mitogen-activated protein kinase (MAPK) pathway components.
  • To provide practical protocols for researchers studying MAPK signaling cascades.

Main Methods:

  • Immunoblotting using specific anti-phospho antibodies to detect phosphorylated MAPK proteins.
  • Immunoprecipitation of target kinases followed by in vitro phosphorylation assays.
  • In-gel kinase assays to assess the activity of MAPK cascade components.

Main Results:

  • Demonstrated the utility of immunoblotting with anti-phospho antibodies for identifying activated MAPK.
  • Validated immunoprecipitation and in-gel kinase assays as effective techniques for studying MAPK activation.
  • Established a toolkit of methods applicable to various MAPK signaling pathways.

Conclusions:

  • The described methods, including immunoblotting, immunoprecipitation, and in-gel kinase assays, are effective for studying MAPK activation.
  • These techniques provide valuable tools for dissecting the complex mechanisms of MAPK signaling cascades.
  • Accurate detection of MAPK activation is essential for understanding cellular signaling.

More Related Videos

Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System08:54

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

Published on: March 20, 2016

Assaying Protein Kinase Activity with Radiolabeled ATP08:05

Assaying Protein Kinase Activity with Radiolabeled ATP

Published on: May 26, 2017

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...
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...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
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...
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,...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...