Download MendeleyMicrosecond Backbone Motions Modulate the Oligomerization of the DNAJB6 Chaperone.
Cawood, E.E., Clore, G.M., Karamanos, T.K.(2022) Angew Chem Int Ed Engl 61: e202116403-e202116403
- PubMed: 35247211
- DOI: https://doi.org/10.1002/anie.202116403
- Primary Citation of Related Structures:
7QBY - PubMed Abstract:
DNAJB6 is a prime example of an anti-aggregation chaperone that functions as an oligomer. DNAJB6 oligomers are dynamic and subunit exchange is critical for inhibiting client protein aggregation. The T193A mutation in the C-terminal domain (CTD) of DNAJB6 reduces both chaperone self-oligomerization and anti-aggregation of client proteins, and has recently been linked to Parkinson's disease. Here, we show by NMR, including relaxation-based methods, that the T193A mutation has minimal effects on the structure of the β-stranded CTD but increases the population and rate of formation of a partially folded state. The results can be rationalized in terms of β-strand peptide plane flips that occur on a timescale of ≈100 μs and lead to global changes in the overall pleat/flatness of the CTD, thereby altering its ability to oligomerize. These findings help forge a link between chaperone dynamics, oligomerization and anti-aggregation activity which may possibly lead to new therapeutic avenues tuned to target specific substrates.
Organizational Affiliation:
Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Mount Preston Street, Leeds, LS2 9JT, UK.
