Small heat shock protein HSPB8 interacts with a pre-fibrillar TDP43 low complexity domain species to delay fibril formation
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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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Shatov, V. M., Strelkov, S. V., & Gusev, N. B. (2020) · International Journal of Molecular Sciences · doi:10.3390/ijms21124248 · Cited by 20 · see citing works
Chaperone‐like activity and surface hydrophobicity of 70S ribosome
Singh, R., & Rao, C. M. (2002) · FEBS Letters · doi:10.1016/s0014-5793(02)03243-x · Cited by 19 · see citing works
Haider, R., Shipley, B., Surewicz, K. A., Hinczewski, M., & Surewicz, W. K. (2024) · Protein Science · doi:10.1002/pro.5179 · Cited by 17 · see citing works
Yin, C.-F., Kao, S.-C., Hsu, C., Chang, Y.-W., Cheung, C. H. Y., Huang, H., & Juan, H. (2020) · Journal of Proteome Research · doi:10.1021/acs.jproteome.9b00836 · Cited by 13 · see citing works
Hussein, R. M., Benjamin, I. J., & Kampinga, H. H. (2015) · PLoS ONE · doi:10.1371/journal.pone.0126761 · Cited by 13 · see citing works
Oxidized GroEL can function as a chaperonin
Melkani, G. C. (2004) · Frontiers in bioscience · doi:10.2741/1258 · Cited by 12 · see citing works
Jovcevski, B., Aquilina, J. A., Benesch, J. L. P., & Ecroyd, H. W. (2018) · Cell Stress and Chaperones · doi:10.1007/s12192-018-0889-y · Cited by 9 · see citing works
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Biophysical Studies of LLPS and Aggregation of TDP-43 LCD
Babinchak, W. M., & Surewicz, W. K. (2022) · Methods in molecular biology · doi:10.1007/978-1-0716-2597-2_31 · Cited by 3 · see citing works
Evolution towards simplicity in bacterial small heat shock protein system
Karaś, P., Kochanowicz, K., Pitek, M., Domanski, P., Obuchowski, I., Tomiczek, B., & Liberek, K. (2023) · eLife · doi:10.7554/elife.89813 · Cited by 2 · see citing works
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Droplet growth, Ostwald’s rule, and emergence of order in Fused in Sarcoma
Maksudov, F., Mugnai, M. L., Domı́nguez, L., Makarov, D. E., & Thirumalai, D. (2026) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2519135123 · Cited by 4 · see citing works
UBQLN2 links proteotoxicity with lipid metabolism in neurodegeneration
Liu, Y., Huang, Z., hsu, Y.-W., Deme, P., Frankenfield, A. M., Wu, S., Zhao, X., Liu, H., Zhang, T., Alexander, E. J., et al. (2026) · Nature Neuroscience · doi:10.1038/s41593-026-02226-y · Cited by 4 · see citing works
- 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)
- PMC
- PMC11838303
- OpenAlex
- W7127624013
- Cited by
- 2
- References
- 101
- Citations by year
- 2026: 2
- FWCI
- 8.50
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- 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
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
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