Non-catalytic signaling by pseudokinase ILK for regulating cell adhesion.Vaynberg, J., Fukuda, K., Lu, F., Bialkowska, K., Chen, Y., Plow, E.F., Qin, J.
(2018) Nat Commun 9: 4465-4465
- PubMed: 30367047
- DOI: https://doi.org/10.1038/s41467-018-06906-7
- Primary Citation of Related Structures:
- PubMed Abstract:
Dynamic communication between integrin-containing complexes (focal adhesions, FAs) and actin filaments is critical for regulating cell adhesion. Pseudokinase ILK plays a key role in this process but the underlying mechanism remains highly elusive. Here we show that by recruiting FA adaptors PINCH and Parvin into a heterotrimeric complex (IPP), ILK triggers F-actin filament bundling - a process known to generate force/mechanical signal to promote cytoskeleton reassembly and dynamic cell adhesion. Structural, biochemical, and functional analyses revealed that the F-actin bundling is orchestrated by two previously unrecognized WASP-Homology-2 actin binding motifs within IPP, one from PINCH and the other from Parvin. Strikingly, this process is also sensitized to Mg-ATP bound to the pseudoactive site of ILK and its dysregulation severely impairs stress fibers formation, cell spreading, and migration. These data identify a crucial mechanism for ILK, highlighting its uniqueness as a pseudokinase to transduce non-catalytic signal and regulate cell adhesion.
Department of Biochemistry, School of Medicine, Case Western Reserve University, Cleveland, OH, 44106, USA.