Cited by 2Amyotrophic Lateral Sclerosis ResearchHeat shock proteins researchAlzheimer's disease research and treatments

Small heat shock protein HSPB8 interacts with a pre-fibrillar TDP43 low complexity domain species to delay fibril formation

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Jami, Khaled M., Corbett, Katherine E., Farb, Daniel C., Osumi, Kayla M., Shafer, Catelynn C., Criscione, Sophie, Murray, Dylan T.·2026·Biophysical Chemistry

Published version of a preprint

Abstract

The loss of cellular proteostasis through aberrant stress granule formation is implicated in neurodegenerative diseases. Stress granules are formed by biomolecular condensation involving protein-protein and protein-RNA interactions. These assemblies are protective, but can rigidify, leading to amyloid-like fibril formation, a hallmark of the disease pathology. Key proteins dictating stress granule formation and disassembly, such as TDP43, contain low-complexity (LC) domains that drive fibril formation. HSPB8, a small heat shock protein, localizes to stress granules, has known aggregation delaying activity, and helps direct aggregated proteins to protein degradation pathways. It is not known how HSPB8 interacts with aggregation prone LC domains in stress granules. Here, we examine the interaction between isolated HSPB8 and the TDP43 LC using thioflavin T (ThT) and fluorescence polarization (FP) aggregation assays, fluorescence microscopy and photobleaching experiments, and crosslinking mass spectrometry (XL-MS). Our results indicate that HSPB8 delays TDP43 LC aggregation through domain-specific interactions with fibril nucleating species, without affecting fibril elongation rates. These findings provide mechanistic insight into how HSPB8 mediates LC domain aggregation and provides bases for investigating how the TDP43 LC subverts chaperone activity in neurodegenerative disease and comparing differing mechanisms between members of the HSPB protein family.

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Crossref · 10.1016/j.bpc.2026.107590

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Authors
Jami, K. M., Corbett, K. E., Farb, D. C., Osumi, K. M., Shafer, C. C., Criscione, S., & Murray, D. T.
Affiliations
  • University of California, Davis (US)
  • University of Connecticut (US)
Corresponding author
Murray, Dylan T.
Venue
Biophysical Chemistry
Publisher
Elsevier BV
Published
2026-05
Volume
332
Pages
107590
ISSN
0301-4622 (ISSN-L)
OpenAlex
W7127624013
Cited by
2
References
101
Citations by year
2026: 2
FWCI
8.50
Type
journal article
Language
en
Open access
Locations
  • Biophysical Chemistry (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by-nc)
Funders
  • University of California, Davis
  • National Institutes of Health (S10OD025271, S10OD026918-01A1, S10OD018913, 1S10OD026702-01)
  • National Institute of General Medical Sciences (R35GM142892)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
HSPB8, TDP-43, low-complexity domains, stress granules, amyloid fibril formation, protein aggregation, fibril nucleation, chaperone activity, neurodegenerative diseases, proteostasis, protein-protein interaction

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