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2018 ; 7
(ä): ä Nephropedia Template TP
gab.com Text
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English Wikipedia
Ensemble cryoEM elucidates the mechanism of insulin capture and degradation by
human insulin degrading enzyme
#MMPMID29596046
Zhang Z
; Liang WG
; Bailey LJ
; Tan YZ
; Wei H
; Wang A
; Farcasanu M
; Woods VA
; McCord LA
; Lee D
; Shang W
; Deprez-Poulain R
; Deprez B
; Liu DR
; Koide A
; Koide S
; Kossiakoff AA
; Li S
; Carragher B
; Potter CS
; Tang WJ
Elife
2018[Mar]; 7
(ä): ä PMID29596046
show ga
Insulin degrading enzyme (IDE) plays key roles in degrading peptides vital in
type two diabetes, Alzheimer's, inflammation, and other human diseases. However,
the process through which IDE recognizes peptides that tend to form amyloid
fibrils remained unsolved. We used cryoEM to understand both the apo- and
insulin-bound dimeric IDE states, revealing that IDE displays a large opening
between the homologous ~55 kDa N- and C-terminal halves to allow selective
substrate capture based on size and charge complementarity. We also used cryoEM,
X-ray crystallography, SAXS, and HDX-MS to elucidate the molecular basis of how
amyloidogenic peptides stabilize the disordered IDE catalytic cleft, thereby
inducing selective degradation by substrate-assisted catalysis. Furthermore, our
insulin-bound IDE structures explain how IDE processively degrades insulin by
stochastically cutting either chain without breaking disulfide bonds. Together,
our studies provide a mechanism for how IDE selectively degrades amyloidogenic
peptides and offers structural insights for developing IDE-based therapies.