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Pericentrin anchors protein kinase A at the centrosome through a newly identified RII-binding domain
D Diviani1, L K Langeberg, S J Doxsey
1Howard Hughes Medical Institute and Vollum Institute, Oregon Health Science University, Portland, 97201, USA.
Current Biology : CB
|February 7, 2001
Summary
Pericentrin, a centrosome protein, directly binds to cAMP-dependent protein kinase (PKA). This interaction suggests pericentrin functions as an A-kinase anchoring protein (AKAP) within the cell.
Area of Science:
- Cell Biology
- Molecular Biology
- Signal Transduction
Background:
- Centrosomes are critical for cell division, regulating microtubule nucleation and spindle assembly.
- cAMP-dependent protein kinase (PKA) is localized to centrosomes via A-kinase anchoring proteins (AKAPs).
- AKAPs bind PKA's regulatory subunit (RII) and target the kinase to specific cellular locations.
Purpose of the Study:
- To investigate the interaction between pericentrin and PKA.
- To determine if pericentrin functions as an AKAP at the centrosome.
Main Methods:
- Co-immunoprecipitation of PKA subunits (RII and catalytic) with pericentrin from HEK-293 cell extracts.
- Assay of PKA catalytic activity in pericentrin immunoprecipitates.
- Analysis of the pericentrin-RII binding domain.
Main Results:
- Pericentrin directly interacts with both the RII and catalytic subunits of PKA.
- PKA catalytic activity is significantly enriched in pericentrin immunoprecipitates.
- A novel 100-amino acid binding domain mediates pericentrin's interaction with RII, distinct from conventional AKAP motifs.
Conclusions:
- Pericentrin functions as an A-kinase anchoring protein (AKAP) in vivo.
- This finding identifies a new role for pericentrin in regulating PKA localization and activity at the centrosome.