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- W2031865362 abstract "Mechanical stretch-induced tyrosine phosphorylation in the proline-rich 306-residue substrate domain (CasSD) of p130Cas (or BCAR1) has eluded an experimentally validated structural understanding. Cellular p130Cas tyrosine phosphorylation is shown to function in areas without internal actomyosin contractility, sensing force at the leading edge of cell migration. Circular dichroism shows CasSD is intrinsically disordered with dominant polyproline type II conformations. Strongly conserved in placental mammals, the proline-rich sequence exhibits a pseudo-repeat unit with variation hotspots 2-9 residues before substrate tyrosine residues. Atomic-force microscopy pulling experiments show CasSD requires minimal extension force and exhibits infrequent, random regions of weak stability. Proteolysis, light scattering and ultracentrifugation results show that a monomeric intrinsically disordered form persists for CasSD in solution with an expanded hydrodynamic radius. All-atom 3D conformer sampling with the TraDES package yields ensembles in agreement with experiment when coil-biased sampling is used, matching the experimental radius of gyration. Increasing β-sampling propensities increases the number of prolate conformers. Combining the results, we conclude that CasSD has no stable compact structure and is unlikely to efficiently autoinhibit phosphorylation. Taking into consideration the structural propensity of CasSD and the fact that it is known to bind to LIM domains, we propose a model of how CasSD and LIM domain family of transcription factor proteins may function together to regulate phosphorylation of CasSD and effect machanosensing." @default.
- W2031865362 created "2016-06-24" @default.
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- W2031865362 date "2014-04-10" @default.
- W2031865362 modified "2023-10-14" @default.
- W2031865362 title "Biophysical Properties of Intrinsically Disordered p130Cas Substrate Domain — Implication in Mechanosensing" @default.
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- W2031865362 doi "https://doi.org/10.1371/journal.pcbi.1003532" @default.
- W2031865362 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3983058" @default.
- W2031865362 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24722239" @default.
- W2031865362 hasPublicationYear "2014" @default.
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