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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

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The Pyk2 FERM regulates Pyk2 complex formation and phosphorylation.

Daniel Riggs¹, Zhongbo Yang, Jean Kloss

¹Department of Biochemistry and Molecular Biology, Mayo Clinic Arizona, Scottsdale, AZ 85259, USA.

Cellular Signalling

|September 21, 2010

Summary

The focal adhesion kinase Pyk2

Area of Science:

Cell biology
Molecular signaling
Protein biochemistry

Background:

Focal adhesion kinase Proline-rich tyrosine kinase 2 (Pyk2) regulates cellular functions by integrating external signals.
The precise mechanism controlling Pyk2 activation is not fully understood.
Previous studies indicated the N-terminal FERM domain is crucial for Pyk2 activity.

Purpose of the Study:

To elucidate the mechanism by which the Pyk2 FERM domain regulates Pyk2 activity.
To investigate the role of Pyk2 oligomerization in its activation.

Main Methods:

Utilized differentially epitope-tagged Pyk2 constructs in cellular assays.
Investigated Pyk2 complex formation and tyrosine phosphorylation.
Examined the effects of expressing Pyk2 FERM domain as an autonomous fragment and deleting the FERM domain from full-length Pyk2.

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Published on: May 3, 2018

Identification of Kinase-substrate Pairs Using High Throughput Screening

Identification of Kinase-substrate Pairs Using High Throughput Screening

Published on: August 29, 2015

Assessing Cellular Target Engagement by SHP2 (PTPN11) Phosphatase Inhibitors

Assessing Cellular Target Engagement by SHP2 (PTPN11) Phosphatase Inhibitors

Published on: July 17, 2020

Main Results:

Pyk2 forms oligomeric complexes in cells, correlating with increased tyrosine phosphorylation.
The Pyk2 FERM domain interacts with other Pyk2 FERM domains.
Autonomous Pyk2 FERM domain inhibits Pyk2 oligomerization and phosphorylation of full-length Pyk2.
Deletion of the FERM domain enhances Pyk2 complex formation and phosphorylation.

Conclusions:

The Pyk2 FERM domain negatively regulates Pyk2 activity by controlling the formation of Pyk2 oligomers.
Pyk2 oligomerization is critical for its activation.
These findings reveal a novel regulatory mechanism for Pyk2 activity.