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Mol Cell February 12, 2010; 37 (3): 355-69.

A DNAJB chaperone subfamily with HDAC-dependent activities suppresses toxic protein aggregation.

Hageman J , Rujano MA , van Waarde MA , Kakkar V , Dirks RP , Govorukhina N , Oosterveld-Hut HM , Lubsen NH , Kampinga HH .

Misfolding and aggregation are associated with cytotoxicity in several protein folding diseases. A large network of molecular chaperones ensures protein quality control. Here, we show that within the Hsp70, Hsp110, and Hsp40 (DNAJ) chaperone families, members of a subclass of the DNAJB family (particularly DNAJB6b and DNAJB8) are superior suppressors of aggregation and toxicity of disease-associated polyglutamine proteins. The antiaggregation activity is largely independent of the N-terminal Hsp70-interacting J-domain. Rather, a C-terminal serine-rich (SSF-SST) region and the C-terminal tail are essential. The SSF-SST region is involved in substrate binding, formation of polydisperse oligomeric complexes, and interaction with histone deacetylases (HDAC4, HDAC6, SIRT2). Inhibiting HDAC4 reduced DNAJB8 function. DNAJB8 is (de)acetylated at two conserved C-terminal lysines that are not involved in substrate binding, but do play a role in suppressing protein aggregation. Combined, our data provide a functional link between HDACs and DNAJs in suppressing cytotoxic protein aggregation.

PubMed ID: 20159555
Article link: Mol Cell

Genes referenced: ar cfp dnaja2 dnajb1 dnajb6 hdac3 hdac4 hdac6 hsp70 hspa1a hspa1l hsph1 ppan sirt2

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