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Related Concept Videos

Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
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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...
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,...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...

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Assaying Protein Kinase Activity with Radiolabeled ATP
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UnPAKing the class differences among p21-activated kinases.

Jeyanthy Eswaran1, Meera Soundararajan, Rakesh Kumar

  • 1University of Oxford, Structural Genomics, Old Road Campus Research Building, Old Road Campus, Roosevelt Drive, Headington, Oxford, UK. jeyanthy.eswaran@sgc.ox.ac.uk

Trends in Biochemical Sciences
|July 22, 2008
PubMed
Summary

p21-activated kinases (PAKs) are crucial cell signaling proteins involved in many processes. Understanding PAK family functions is key to developing new therapeutics for various diseases.

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Area of Science:

  • Cellular Biology
  • Molecular Signaling
  • Biochemistry

Background:

  • p21-activated kinases (PAKs) are serine/threonine kinases regulating vital cellular processes like morphology, motility, survival, gene transcription, and hormone signaling.
  • The mammalian PAK family comprises six kinases, divided into Group I (PAK1-3) and Group II (PAK4-6), distinguished by their domain structure and regulation.
  • PAKs act as dynamic signaling nodes, making them significant targets for therapeutic interventions in oncology, neurology, and infectious diseases.

Purpose of the Study:

  • To provide a comprehensive overview of the PAK family.
  • To highlight recent findings on PAK cellular functions, activation mechanisms, catalysis, and substrate specificity.
  • To emphasize the importance of understanding the entire PAK family for therapeutic development.

Main Methods:

  • Review of recent scientific literature on PAK family kinases.
  • Analysis of newly reported structural data for PAKs.
  • Synthesis of information on PAK activation, catalysis, and substrate interactions.

Main Results:

  • Recent studies have elucidated the cellular functions of all PAKs.
  • New structural insights reveal molecular mechanisms of PAK activation, catalysis, and substrate specificity.
  • The distinct domain architecture and regulation differentiate Group I (PAK1-3) and Group II (PAK4-6) PAKs.

Conclusions:

  • A thorough understanding of the entire PAK family is essential for advancing therapeutic strategies.
  • Targeting PAKs holds promise for treating tumors, neurological disorders, and infections.
  • Continued research into PAK molecular mechanisms will facilitate the development of PAK-targeted therapeutics.