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Regulation of VASP by phosphorylation: consequences for cell migration
1Department of Cancer Biology; Mayo Clinic Comprehensive Cancer Center; Mayo Clinic; Jacksonville, FL USA.
Cell Adhesion & Migration
|January 10, 2014
Summary
Phosphorylations regulate vasodilator-stimulated phospho-protein (VASP) function. Protein Kinase D1 (PKD1) phosphorylates VASP at S157 and S322, impacting cell motility by controlling F-actin accumulation and filopodia formation.
Area of Science:
- Cell biology
- Molecular signaling
- Biochemistry
Background:
- Phosphorylation is a key regulatory mechanism for protein function.
- Vasodilator-stimulated phospho-protein (VASP) is involved in cytoskeletal dynamics.
- Multiple phosphorylation sites on VASP have been identified, influencing its function.
Purpose of the Study:
- To investigate the role of Protein Kinase D1 (PKD1) in VASP phosphorylation.
- To elucidate how specific VASP phosphorylation sites affect cell motility.
- To understand the regulatory switch mechanism controlling cell migration.
Main Methods:
- Phosphorylation site mapping of VASP.
- Kinase assays to identify VASP phosphorylating enzymes.
- Analysis of F-actin accumulation and filopodia formation in migrating cells.
- Assessment of focal adhesion dynamics.
Main Results:
- VASP phosphorylation sites include Y39, S157, S239, T278, and S322.
- PKD1 directly phosphorylates VASP at S157 and S322.
- S157 phosphorylation promotes membrane localization.
- S322 phosphorylation enhances filopodia formation, while S239/T278 phosphorylation inhibits it and disrupts focal adhesions.
Conclusions:
- PKD1 acts as a critical regulator of VASP phosphorylation.
- Specific VASP phosphorylation events serve as molecular switches controlling cell migration.
- Understanding these phosphorylation dynamics is crucial for deciphering cell motility mechanisms.
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