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Vol. 15, Issue 9, 4003-4010, September 2004
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Institut für Zellbiologie and Bonner Forum Biomedizin, Rheinische Friedrich-Wilhelms-Universität Bonn, D-53121 Bonn, Germany
Submitted April 8, 2004;
Revised May 14, 2004;
Accepted June 11, 2004
Monitoring Editor: Peter Walter
The CHIP ubiquitin ligase turns molecular chaperones into protein degradation factors. CHIP associates with the chaperones Hsc70 and Hsp90 during the regulation of signaling pathways and during protein quality control, and directs chaperone-bound clients to the proteasome for degradation. Obviously, this destructive activity should be carefully controlled. Here, we identify the cochaperone HspBP1 as an inhibitor of CHIP. HspBP1 attenuates the ubiquitin ligase activity of CHIP when complexed with Hsc70. As a consequence, HspBP1 interferes with the CHIP-induced degradation of immature forms of the cystic fibrosis transmembrane conductance regulator (CFTR) and stimulates CFTR maturation. Our data reveal a novel regulatory mechanism that determines folding and degradation activities of molecular chaperones.
* Corresponding author. E-mail address: hoehfeld{at}uni-bonn.de.
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