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Related Concept Videos

Phosphorylation01:02

Phosphorylation

The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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Identification of Kinase-substrate Pairs Using High Throughput Screening
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Published on: August 29, 2015

Rethinking pseudokinases.

Natarajan Kannan1, Susan S Taylor

  • 1Department of Chemistry, Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA 92014-6054, USA.

Cell
|April 22, 2008
PubMed
Summary
This summary is machine-generated.

Pseudokinases are usually inactive, but new research shows the CASK pseudokinase domain can be active. This study challenges the traditional view of pseudokinase catalytic inactivity in vivo.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Pseudokinases are protein kinases lacking key catalytic residues, leading to their classification as inactive.
  • The traditional view holds that pseudokinases are catalytically inert due to their structural divergence from active kinases.

Purpose of the Study:

  • To investigate the catalytic activity of the pseudokinase domain of CASK (Ca2+/calmodulin activated serine-threonine kinase).
  • To challenge the assumption that all pseudokinases are catalytically inactive.

Main Methods:

  • Structural analysis of the CASK pseudokinase domain.
  • In vivo assays to assess catalytic activity.

Main Results:

  • The pseudokinase domain of CASK was shown to adopt an active conformation.
  • Evidence of catalytic activity for the CASK pseudokinase domain in vivo was demonstrated.

Conclusions:

  • The findings challenge the established dogma of pseudokinase inactivity.
  • CASK represents a pseudokinase that exhibits catalytic activity, suggesting a more nuanced understanding of this protein class is required.