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2015 ; 21
(39
): 13598-608
Nephropedia Template TP
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Activation of Hsp90 Enzymatic Activity and Conformational Dynamics through
Rationally Designed Allosteric Ligands
#MMPMID26286886
Sattin S
; Tao J
; Vettoretti G
; Moroni E
; Pennati M
; Lopergolo A
; Morelli L
; Bugatti A
; Zuehlke A
; Moses M
; Prince T
; Kijima T
; Beebe K
; Rusnati M
; Neckers L
; Zaffaroni N
; Agard DA
; Bernardi A
; Colombo G
Chemistry
2015[Sep]; 21
(39
): 13598-608
PMID26286886
show ga
Hsp90 is a molecular chaperone of pivotal importance for multiple cell pathways.
ATP-regulated internal dynamics are critical for its function and current
pharmacological approaches block the chaperone with ATP-competitive inhibitors.
Herein, a general approach to perturb Hsp90 through design of new allosteric
ligands aimed at modulating its functional dynamics is proposed. Based on the
characterization of a first set of 2-phenylbenzofurans showing stimulatory
effects on Hsp90 ATPase and conformational dynamics, new ligands were developed
that activate Hsp90 by targeting an allosteric site, located 65?Å from the active
site. Specifically, analysis of protein responses to first-generation activators
was exploited to guide the design of novel derivatives with improved ability to
stimulate ATP hydrolysis. The molecules' effects on Hsp90 enzymatic,
conformational, co-chaperone and client-binding properties were characterized
through biochemical, biophysical and cellular approaches. These designed probes
act as allosteric activators of the chaperone and affect the viability of cancer
cell lines for which proper functioning of Hsp90 is necessary.