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Title: Skeletal Dysplasia Mutations Effect on Human Filamins’ Structure and Mechanosensing

Journal Article · · Scientific Reports
 [1];  [2];  [1];  [3];  [1];  [4];  [5];  [1];  [1]
  1. Univ. of Jyvaskyla (Finland). Dept. of Biological and Environmental Science. Nanoscience Center
  2. Univ. of Illinois, Champaign, IL (United States). Beckman Inst. for Advanced Science and Technology
  3. Univ. of Jyvaskyla (Finland). Dept. of Chemistry
  4. Univ. of Illinois, Champaign, IL (United States). Beckman Inst. for Advanced Science and Technology. Dept. of Physics
  5. Univ. of Jyvaskyla (Finland). Dept. of Biological and Environmental Science. Nanoscience Center. Dept. of Chemistry

Cells’ ability to sense mechanical cues in their environment is crucial for fundamental cellular processes, leading defects in mechanosensing to be linked to many diseases. The actin cross-linking protein Filamin has an important role in the conversion of mechanical forces into biochemical signals. Here, we reveal how mutations in Filamin genes known to cause Larsen syndrome and Frontometaphyseal dysplasia can affect the structure and therefore function of Filamin domains 16 and 17. Employing X-ray crystallography, the structure of these domains was first solved for the human Filamin B. The interaction seen between domains 16 and 17 is broken by shear force as revealed by steered molecular dynamics simulations. The effects of skeletal dysplasia associated mutations of the structure and mechanosensing properties of Filamin were studied by combining various experimental and theoretical techniques. The results showed that Larsen syndrome associated mutations destabilize or even unfold domain 17. Interestingly, those Filamin functions that are mediated via domain 17 interactions with other proteins are not necessarily affected as strongly interacting peptide binding to mutated domain 17 induces at least partial domain folding. Mutation associated to Frontometaphyseal dysplasia, in turn, transforms 16–17 fragment from compact to an elongated form destroying the force-regulated domain pair.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Jyvaskyla (Finland)
Sponsoring Organization:
USDOE Office of Science (SC); National Inst. of Health (NIH) (United States); Academy of Finland
Grant/Contract Number:
AC02-05CH11231; 9P41GM104601; 283481; 138327; 278668; 288235; 2000268; jyy2516
OSTI ID:
1490409
Journal Information:
Scientific Reports, Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (3)

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The filamin-B–refilin axis – spatiotemporal regulators of the actin-cytoskeleton in development and disease journal April 2018
Mechanisms of Nanonewton Mechanostability in a Protein Complex Revealed by Molecular Dynamics Simulations and Single-Molecule Force Spectroscopy text January 2019

Figures / Tables (8)