The S/T-Rich Motif in the DNAJB6 Chaperone Delays Polyglutamine Aggregation and the Onset of Disease in a Mouse Model

Vaishali Kakkar, Cecilia Månsson, Eduardo P. de Mattos, Steven Bergink, Marianne van der Zwaag, Maria A.W.H. van Waarde, Niels J. Kloosterhuis, Ronald Melki, Remco T.P. van Cruchten, Salam Al-Karadaghi, Paolo Arosio, Christopher M. Dobson, Tuomas P.J. Knowles, Gillian P. Bates, Jan M. van Deursen, Sara Linse, Bart van de Sluis, Cecilia Emanuelsson, Harm H. Kampinga

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


Expanded CAG repeats lead to debilitating neurodegenerative disorders characterized by aggregation of proteins with expanded polyglutamine (polyQ) tracts. The mechanism of aggregation involves primary and secondary nucleation steps. We show how a noncanonical member of the DNAJ-chaperone family, DNAJB6, inhibits the conversion of soluble polyQ peptides into amyloid fibrils, in particular by suppressing primary nucleation. This inhibition is mediated by a serine/threonine-rich region that provides an array of surface-exposed hydroxyl groups that bind to polyQ peptides and may disrupt the formation of the H bonds essential for the stability of amyloid fibrils. Early prevention of polyQ aggregation by DNAJB6 occurs also in cells and leads to delayed neurite retraction even before aggregates are visible. In a mouse model, brain-specific coexpression of DNAJB6 delays polyQ aggregation, relieves symptoms, and prolongs lifespan, pointing to DNAJB6 as a potential target for disease therapy and tool for unraveling early events in the onset of polyQ diseases. Kakkar et al. show that DNAJB6 is a chaperone that inhibits early steps in the formation of polyQ amyloid fibrils. An S/T-rich region in DNAJB6 is crucial for this function. In a polyQ mouse model, the inhibitory effects of DNAJB6 delay disease onset and increase lifespan.

Original languageEnglish (US)
Pages (from-to)272-283
Number of pages12
JournalMolecular Cell
Issue number2
StatePublished - Apr 21 2016

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


Dive into the research topics of 'The S/T-Rich Motif in the DNAJB6 Chaperone Delays Polyglutamine Aggregation and the Onset of Disease in a Mouse Model'. Together they form a unique fingerprint.

Cite this