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2015 ; 29
(12
): 1285-97
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Homeostatic control of Hippo signaling activity revealed by an endogenous
activating mutation in YAP
#MMPMID26109051
Chen Q
; Zhang N
; Xie R
; Wang W
; Cai J
; Choi KS
; David KK
; Huang B
; Yabuta N
; Nojima H
; Anders RA
; Pan D
Genes Dev
2015[Jun]; 29
(12
): 1285-97
PMID26109051
show ga
The Hippo signaling pathway converges on YAP to regulate growth, differentiation,
and regeneration. Previous studies with overexpressed proteins have shown that
YAP is phosphorylated by its upstream kinase, Lats1/2, on multiple sites,
including an evolutionarily conserved 14-3-3-binding site whose phosphorylation
is believed to inhibit YAP by excluding it from the nucleus. Indeed, nuclear
localization of YAP or decreased YAP phosphorylation at this site (S168 in
Drosophila, S127 in humans, and S112 in mice) is widely used in current
literature as a surrogate of YAP activation even though the physiological
importance of this phosphorylation event in regulating endogenous YAP activity
has not been defined. Here we address this question by introducing a Yap(S112A)
knock-in mutation in the endogenous Yap locus. The Yap(S112A) mice are
surprisingly normal despite nuclear localization of the mutant YAP protein in
vivo and profound defects in cytoplasmic translocation in vitro. Interestingly,
the mutant Yap(S112A) mice show a compensatory decrease in YAP protein levels due
to increased phosphorylation at a mammalian-specific phosphodegron site on YAP.
These findings reveal a robust homeostatic mechanism that maintains physiological
levels of YAP activity and caution against the assumptive use of YAP localization
alone as a surrogate of YAP activity.
|Adaptor Proteins, Signal Transducing/*genetics/*metabolism
[MESH]