HspB1 phosphorylation regulates its intramolecular dynamics and mechanosensitive molecular chaperone interaction with filamin C

Miranda P Collier, T R Alderson, Carin P de Villiers, Daisy Nicholls, Heidi Y Gastall, Timothy M Allison, Matteo T Degiacomi, He Jiang, Georg Mlynek, Dieter O Furst, Peter F M van der Ven, Kristina Djinovic-Carugo, Andrew J Baldwin, Hugh Watkins, Katja Gehmlich, Justin L P Benesch

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15 Citations (Scopus)
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Abstract

Mechanical force-induced conformational changes in proteins underpin a variety of physiological functions, typified in muscle contractile machinery. Mutations in the actin-binding protein filamin C (FLNC) are linked to musculoskeletal pathologies characterized by altered biomechanical properties and sometimes aggregates. HspB1, an abundant molecular chaperone, is prevalent in striated muscle where it is phosphorylated in response to cues including mechanical stress. We report the interaction and up-regulation of both proteins in three mouse models of biomechanical stress, with HspB1 being phosphorylated and FLNC being localized to load-bearing sites. We show how phosphorylation leads to increased exposure of the residues surrounding the HspB1 phosphosite, facilitating their binding to a compact multidomain region of FLNC proposed to have mechanosensing functions. Steered unfolding of FLNC reveals that its extension trajectory is modulated by the phosphorylated region of HspB1. This may represent a posttranslationally regulated chaperone-client protection mechanism targeting over-extension during mechanical stress.

Original languageEnglish
Article numbereaav8421
JournalScience Advances
Volume5
Issue number5
DOIs
Publication statusPublished - 22 May 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • General

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