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Title: Non-catalytic signaling by pseudokinase ILK for regulating cell adhesion

Journal Article · · Nature Communications
 [1];  [1];  [2];  [1];  [3];  [1];  [2]
  1. Cleveland Clinic, Cleveland, OH (United States)
  2. Cleveland Clinic, Cleveland, OH (United States); Case Western Reserve Univ., Cleveland, OH (United States)
  3. Case Western Reserve Univ., Cleveland, OH (United States)

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 in this paper 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.

Research Organization:
Cleveland Clinic, Cleveland, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357; HL058758; 1S10RR026820-01
OSTI ID:
1483387
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (5)

Cell Adhesion by Integrins journal October 2019
Identification of ILK as a critical regulator of VEGFR 3 signalling and lymphatic vascular growth journal December 2018
Genetic Animal Models for Arrhythmogenic Cardiomyopathy journal June 2020
ILK supports RhoA/ROCK-mediated contractility of human intestinal epithelial crypt cells by inducing the fibrillogenesis of endogenous soluble fibronectin during the spreading process journal March 2020
Emerging regulators of vascular smooth muscle cell migration journal June 2019