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Non-catalytic signaling by pseudokinase ILK for regulating cell adhesion
Julia Vaynberg1, Koichi Fukuda1, Fan Lu1,2
1Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH, 44195, USA.
Nature Communications
|October 28, 2018
Summary
Integrin-linked kinase (ILK) uses a novel mechanism involving actin filament bundling to regulate cell adhesion. This pseudokinase activity is critical for cell spreading and migration.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Dynamic communication between focal adhesions (FAs) and actin filaments is essential for cell adhesion regulation.
- Pseudokinase ILK is implicated in this process, but its mechanism is poorly understood.
Purpose of the Study:
- To elucidate the mechanism by which ILK regulates cell adhesion through F-actin bundling.
- To identify the structural components and signaling pathways involved in ILK-mediated cell adhesion.
Main Methods:
- Structural, biochemical, and functional analyses were employed.
- Investigated the role of the ILK-PINCH-Parvin (IPP) complex in F-actin binding and bundling.
- Assessed the impact of ILK dysregulation on cellular processes.
Main Results:
- ILK recruits FA adaptors PINCH and Parvin to form a heterotrimeric IPP complex.
- The IPP complex directly induces F-actin filament bundling via two novel WH2 motifs.
- This bundling is dependent on Mg-ATP binding to ILK's pseudoactive site.
- ILK dysregulation impairs stress fiber formation, cell spreading, and migration.
Conclusions:
- Identified a novel mechanism where ILK acts as a pseudokinase to transduce non-catalytic signals.
- Demonstrated that ILK-mediated F-actin bundling is crucial for regulating cell adhesion dynamics.
- Highlighted the importance of the IPP complex and its actin-binding motifs in cytoskeleton organization and cell motility.
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