ArticleCommunications biology2023
Short hydrophobic loop motifs in BRICHOS domains determine chaperone activity against amorphous protein aggregation but not against amyloid formation.
Article in Communications biology, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Chaperone-Mediated Regulation of Tau Phase Separation, Fibrillation, and Toxicity.Journal of the American Chemical Society · 2025Article
- Determinants for Substoichiometric Inhibition of IAPP and Aβ Amyloid Aggregations by Bri2 BRICHOS.ACS chemical neuroscience · 2025Article
- Molecular basis for different substrate-binding sites and chaperone functions of the BRICHOS domain.Protein science : a publication of the Protein Society · 2024Article
- Identification of potential aggregation hotspots on Aβ42 fibrils blocked by the anti-amyloid chaperone-like BRICHOS domain.Nature communications · 2024Article
- A new kid in the folding funnel: Molecular chaperone activities of the BRICHOS domain.Protein science : a publication of the Protein Society · 2023Review
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Authors and funding
11 authors.
Funding
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Abstract
ATP-independent molecular chaperones are important for maintaining cellular fitness but the molecular determinants for preventing aggregation of partly unfolded protein substrates remain unclear, particularly regarding assembly state and basis for substrate recognition. The BRICHOS domain can perform small heat shock (sHSP)-like chaperone functions to widely different degrees depending on its assembly state and sequence. Here, we observed three hydrophobic sequence motifs in chaperone-active domains, and found that they get surface-exposed when the BRICHOS domain assembles into larger oligomers. Studies of loop-swap variants and site-specific mutants further revealed that the biological hydrophobicities of the three short motifs linearly correlate with the efficiency to prevent amorphous protein aggregation. At the same time, they do not at all correlate with the ability to prevent ordered amyloid fibril formation. The linear correlations also accurately predict activities of chimeras containing short hydrophobic sequence motifs from a sHSP that is unrelated to BRICHOS. Our data indicate that short, exposed hydrophobic motifs brought together by oligomerisation are sufficient and necessary for efficient chaperone activity against amorphous protein aggregation.
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Registered trials
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