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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2015 ; 6
(ä): 8023
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Identification of a novel actin-dependent signal transducing module allows for
the targeted degradation of GLI1
#MMPMID26310823
Schneider P
; Bayo-Fina JM
; Singh R
; Kumar Dhanyamraju P
; Holz P
; Baier A
; Fendrich V
; Ramaswamy A
; Baumeister S
; Martinez ED
; Lauth M
Nat Commun
2015[Aug]; 6
(ä): 8023
PMID26310823
show ga
The Down syndrome-associated DYRK1A kinase has been reported as a stimulator of
the developmentally important Hedgehog (Hh) pathway, but cells from Down syndrome
patients paradoxically display reduced Hh signalling activity. Here we find that
DYRK1A stimulates GLI transcription factor activity through phosphorylation of
general nuclear localization clusters. In contrast, in vivo and in vitro
experiments reveal that DYRK1A kinase can also function as an inhibitor of
endogenous Hh signalling by negatively regulating ABLIM proteins, the actin
cytoskeleton and the transcriptional co-activator MKL1 (MAL). As a final effector
of the DYRK1A-ABLIM-actin-MKL1 sequence, we identify the MKL1 interactor Jumonji
domain demethylase 1A (JMJD1A) as a novel Hh pathway component stabilizing the
GLI1 protein in a demethylase-independent manner. Furthermore, a Jumonji-specific
small-molecule antagonist represents a novel and powerful inhibitor of Hh signal
transduction by inducing GLI1 protein degradation in vitro and in vivo.