Cited by 28Heat shock proteins researchProtein Structure and DynamicsMuscle Physiology and Disorders

The DOI matches its Crossref record; 61 of the 61 references it cites were found in a registry or an index.

Specific sequences in the N-terminal domain of human small heat-shock protein HSPB6 dictate preferential hetero-oligomerization with the orthologue HSPB1

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Abstract

Small heat-shock proteins (sHSPs) are a conserved group of molecular chaperones with important roles in cellular proteostasis. Although sHSPs are characterized by their small monomeric weight, they typically assemble into large polydisperse oligomers that vary in both size and shape but are principally composed of dimeric building blocks. These assemblies can include different sHSP orthologues, creating additional complexity that may affect chaperone activity. However, the structural and functional properties of such hetero-oligomers are poorly understood. We became interested in hetero-oligomer formation between human heat-shock protein family B (small) member 1 (HSPB1) and HSPB6, which are both highly expressed in skeletal muscle. When mixed in vitro , these two sHSPs form a polydisperse oligomer array composed solely of heterodimers, suggesting preferential association that is determined at the monomer level. Previously, we have shown that the sHSP N-terminal domains (NTDs), which have a high degree of intrinsic disorder, are essential for the biased formation. Here we employed iterative deletion mapping to elucidate how the NTD of HSPB6 influences its preferential association with HSPB1 and show that this region has multiple roles in this process. First, the highly conserved motif RLFDQ X FG is necessary for subunit exchange among oligomers. Second, a site ˜20 residues downstream of this motif determines the size of the resultant hetero-oligomers. Third, a region unique to HSPB6 dictates the preferential formation of heterodimers. In conclusion, the disordered NTD of HSPB6 helps regulate the size and stability of hetero-oligomeric complexes, indicating that terminal sHSP regions define the assembly properties of these proteins.

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Crossref · 10.1074/jbc.m116.773515

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Metadata

Authors
Heirbaut, M., Lermyte, F., Martin, E. M., Beelen, S., Sobott, F., Strelkov, S. V., & Weeks, S. D.
Affiliations
  • KU Leuven (BE)
  • University of Antwerp (BE)
  • University of Leeds (GB)
Corresponding author
  • Strelkov, Sergei V.
  • Weeks, Stephen D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2017-06
Volume
292
Issue
24
Pages
9944-9957
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2613815235
Cited by
28
References
61
Citations by year
2026: 2 · 2025: 3 · 2023: 5 · 2022: 2 · 2021: 2 · 2020: 7 · 2019: 3 · 2018: 4
FWCI
1.56
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (submittedVersion)
  • Lirias (submittedVersion, other-oa)
Funders
Fonds Wetenschappelijk Onderzoek (G093615N, WO03315N, 11L4115N)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
small heat shock proteins, HSPB6, HSPB1, hetero-oligomerization, N-terminal domain, intrinsically disordered regions, heterodimer, molecular chaperones, oligomer assembly, subunit exchange, oligomer size, skeletal muscle, proteostasis
MeSH terms
Cross-Linking Reagents, Heat-Shock Proteins, Humans, Models, Molecular, Nitrogen Isotopes, Peptide Fragments, Protein Conformation, Recombinant Fusion Proteins, Recombinant Proteins, Sulfhydryl Reagents, Mutagenesis, Site-Directed, Conserved Sequence, Gene Deletion, Point Mutation, Molecular Chaperones, Dimerization, Amino Acid Substitution, Amino Acid Motifs, HSP20 Heat-Shock Proteins, Scattering, Small Angle, Protein Interaction Domains and Motifs, Protein Multimerization, Protein Stability, HSP27 Heat-Shock Proteins

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