Chaperone-like activity of the N-terminal region of a human small heat shock protein and chaperone-functionalized nanoparticles.
Publication/Presentation Date
5-1-2019
Abstract
Small heat shock proteins (sHsps) are molecular chaperones employed to interact with a diverse range of substrates as the first line of defense against cellular protein aggregation. The N-terminal region (NTR) is implicated in defining features of sHsps; notably in their ability to form dynamic and polydisperse oligomers, and chaperone activity. The physiological relevance of oligomerization and chemical-scale mode(s) of chaperone function remain undefined. We present novel chemical tools to investigate chaperone activity and substrate specificity of human HspB1 (B1NTR), through isolation of B1NTR and development of peptide-conjugated gold nanoparticles (AuNPs). We demonstrate that B1NTR exhibits chaperone capacity for some substrates, determined by anti-aggregation assays and size-exclusion chromatography. The importance of protein dynamics and multivalency on chaperone capacity was investigated using B1NTR-conjugated AuNPs, which exhibit concentration-dependent chaperone activity for some substrates. Our results implicate sHsp NTRs in chaperone activity, and demonstrate the therapeutic potential of sHsp-AuNPs in rescuing aberrant protein aggregation.
Volume
87
Issue
5
First Page
401
Last Page
415
ISSN
1097-0134
Published In/Presented At
Gliniewicz, E. F., Chambers, K. M., De Leon, E. R., Sibai, D., Campbell, H. C., & McMenimen, K. A. (2019). Chaperone-like activity of the N-terminal region of a human small heat shock protein and chaperone-functionalized nanoparticles. Proteins, 87(5), 401–415. https://doi.org/10.1002/prot.25662
Disciplines
Medicine and Health Sciences
PubMedID
30684363
Department(s)
Fellows and Residents
Document Type
Article