Journal
CELL REPORTS
Volume 20, Issue 12, Pages 2800-2809Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2017.08.079
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Funding
- NIH [R01-CA095130, P01-CA186866, R01-AI070603]
- Richard and Mae Stone Goode Foundation of Buffalo
- Avon Foundation [02-2016-079]
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Hsp90 chaperones undergo ATP-driven conformational changes during the maturation of client proteins, populating a closed state upon ATP binding in which the N-terminal domains of the homodimer form a second inter-protomer dimer interface. A structure of GRP94, the endoplasmic reticulum hsp90, in a closed conformation has not been described, and the determinants that regulate closure are not well understood. Here, we determined the 2.6-angstrom structure of AMPPNP-bound GRP94 in the closed dimer conformation. The structure includes the pre-N domain, a region preceding the N-terminal domain that is highly conserved in GRP94, but not in other hsp90s. We show that the GRP94 pre-N domain is essential for client maturation, and we identify the pre-N domain as an important regulator of ATPase rates and dimer closure. The structure also reveals a GRP94: polypeptide interaction that partially mimics a client-bound state. The results provide structural insight into the ATP-dependent client maturation process of GRP94.
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