6GJH image
Deposition Date 2018-05-16
Release Date 2019-05-29
Last Version Date 2024-10-16
Entry Detail
PDB ID:
6GJH
Keywords:
Title:
Human Hsp27 (HspB1) alpha-crystallin domain in complex with a peptide mimic of its phosphorylatable N-terminal region
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Heat shock protein beta-1
Gene (Uniprot):HSPB1
Chain IDs:A, B, C (auth: E), D (auth: F), E (auth: G), F (auth: H), G (auth: C), H (auth: D)
Chain Length:87
Number of Molecules:8
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:LEU-SER-GLY-VAL
Chain IDs:J
Chain Length:4
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:ALA-LEU-SER-ARG-GLN
Chain IDs:I (auth: K)
Chain Length:5
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:ALA-LEU-SER-ARG
Chain IDs:K (auth: L), L (auth: I)
Chain Length:4
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
HspB1 phosphorylation regulates its intramolecular dynamics and mechanosensitive molecular chaperone interaction with filamin C.
Sci Adv 5 eaav8421 eaav8421 (2019)
PMID: 31131323 DOI: 10.1126/sciadv.aav8421

Abstact

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.

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Primary Citation of related structures