Abstract:
:Cytosolic HSP90 requires multiple cochaperones in folding client proteins. However, the function of gp96 (HSP90b1, grp94), an HSP90 paralogue in the endoplasmic reticulum (ER), is believed to be independent of cochaperones. Here, we demonstrate that gp96 chaperones multiple Toll-like receptors (TLRs), but not TLR3, in a manner that is dependent on another ER luminal protein, CNPY3. gp96 directly interacts with CNPY3, and the complex dissociates in the presence of adenosine triphosphate (ATP). Genetic disruption of gp96-CNPY3 interaction completely abolishes their TLR chaperone function. Moreover, we demonstrate that TLR9 forms a multimolecular complex with gp96 and CNPY3, and the binding of TLR9 to either molecule requires the presence of the other. We suggest that CNPY3 interacts with the ATP-sensitive conformation of gp96 to promote substrate loading. Our study has thus established CNPY3 as a TLR-specific cochaperone for gp96.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Liu B,Yang Y,Qiu Z,Staron M,Hong F,Li Y,Wu S,Li Y,Hao B,Bona R,Han D,Li Zdoi
10.1038/ncomms1070subject
Has Abstractpub_date
2010-09-21 00:00:00pages
79issn
2041-1723pii
ncomms1070journal_volume
1pub_type
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