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- W2925078176 abstract "Abstract Some molecular chaperones are involved not only in assisting the folding of proteins but also, given appropriate conditions, in their degradation. This is the case for Hsp70 and Hsp90 which, in concert with the cochaperone CHIP, direct their bound substrate to degradation through ubiquitination. We generated complexes between the chaperones (Hsp70 or Hsp90), the cochaperone CHIP and, as substrate, a p53 variant containing the GST protein (p53-TMGST). Both ternary complexes (Hsp70:p53-TMGST:CHIP and Hsp90:p53-TMGST:CHIP) ubiquitinated the substrate at a higher efficiency than in the absence of the chaperones. The 3D structures of the two complexes, obtained using a combination of cryoelectron microscopy and crosslinking mass spectrometry, showed the substrate located between the chaperone and the cochaperone, suggesting a ubiquitination mechanism in which the chaperone-bound substrate is presented to CHIP. These complexes are inherently flexible, which is important for the ubiquitination process." @default.
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- W2925078176 date "2019-03-25" @default.
- W2925078176 modified "2023-10-17" @default.
- W2925078176 title "The cochaperone CHIP marks Hsp70- and Hsp90-bound substrates for degradation through a very flexible mechanism" @default.
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- W2925078176 doi "https://doi.org/10.1038/s41598-019-41060-0" @default.
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