Wiring of cellular proteostasis by J-domain proteins.

Originally J-domain proteins (JDPs) were viewed as accessory co-chaperones of 70 kDa heat shock proteins (Hsp70s), the actual chaperones, stimulating ATPase activity of Hsp70s when a protein substrate is bound. This view apparently underestimates the role of JDPs, as most of the decisions within the Hsp70 network seems to be taken at the level of JDPs. The JDPs are the brain, so to speak, and the Hsp70s are the muscles of this chaperone network.