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2014 ; 157
(7
): 1685-97
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Glucocorticoid receptor function regulated by coordinated action of the Hsp90 and
Hsp70 chaperone cycles
#MMPMID24949977
Kirschke E
; Goswami D
; Southworth D
; Griffin PR
; Agard DA
Cell
2014[Jun]; 157
(7
): 1685-97
PMID24949977
show ga
The glucocorticoid receptor (GR), like many signaling proteins, depends on the
Hsp90 molecular chaperone for in vivo function. Although Hsp90 is required for
ligand binding in vivo, purified apo GR is capable of binding ligand with no
enhancement from Hsp90. We reveal that Hsp70, known to facilitate client delivery
to Hsp90, inactivates GR through partial unfolding, whereas Hsp90 reverses this
inactivation. Full recovery of ligand binding requires ATP hydrolysis on Hsp90
and the Hop and p23 cochaperones. Surprisingly, Hsp90 ATP hydrolysis appears to
regulate client transfer from Hsp70, likely through a coupling of the two
chaperone's ATP cycles. Such coupling is embodied in contacts between Hsp90 and
Hsp70 in the GR:Hsp70:Hsp90:Hop complex imaged by cryoelectron microscopy.
Whereas GR released from Hsp70 is aggregation prone, release from Hsp90 protects
GR from aggregation and enhances its ligand affinity. Together, this illustrates
how coordinated chaperone interactions can enhance stability, function, and
regulation.