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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 J+Biol+Chem
2016 ; 291
(47
): 24418-24430
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SUMO Modification Reverses Inhibitory Effects of Smad Nuclear Interacting
Protein-1 in TGF-? Responses
#MMPMID27703003
Liu S
; Long J
; Yuan B
; Zheng M
; Xiao M
; Xu J
; Lin X
; Feng XH
J Biol Chem
2016[Nov]; 291
(47
): 24418-24430
PMID27703003
show ga
SNIP1 (Smad nuclear interacting protein 1) is a transcription repressor for the
TGF-? and NF-?B signaling pathways through disrupting the recruitment of
co-activator p300. However, it is unclear how the functions of SNIP1 in the TGF-?
signaling pathway are controlled. Our present studies show that SNIP1 is
covalently modified by small ubiquitin-like modifier (SUMO) in vitro and in vivo
at three lysine sites: Lys(5), Lys(30), and Lys(108), with Lys(30) being the
major SUMO modification site. SUMOylation of SNIP1 is enhanced by SUMO E3 ligase
PIAS proteins and inhibited by SUMO proteases SENP1/2. Furthermore, we find that
SUMOylation of SNIP1 attenuates its inhibitory effect in TGF-? signaling because
the SUMO-conjugated form of SNIP1 exhibits impaired ability to disrupt the
formation of Smad complex and the interaction between p300 and Smads.
Subsequently, SUMOylation of SNIP1 leads to the loss of SNIP1-mediated inhibition
on expression of the TGF-? target genes PAI-1 and MMP2 and eventually enhances
TGF-?-regulated cell migration and invasion.
|A549 Cells
[MESH]
|Animals
[MESH]
|COS Cells
[MESH]
|Cell Movement/*physiology
[MESH]
|Chlorocebus aethiops
[MESH]
|HeLa Cells
[MESH]
|Humans
[MESH]
|Intracellular Signaling Peptides and Proteins/genetics/*metabolism
[MESH]