XIAP monoubiquitylates Groucho/TLE to promote canonical Wnt signaling.

XIAP monoubiquitylates Groucho/TLE to promote canonical Wnt signaling.
复制标题

Xiap MonubiquityLETS GROUCHO/TLE以促进典型的Wnt信号传导。

DOI:
10.1016/j.molcel.2011.12.032
复制
发表时间:
2012-03-09
期刊:
影响因子:
16
通讯作者:
Lee, Ethan
Lee, Ethan
中科院分区:
生物学1区
文献类型:
--
作者:
Hanson, Alison J.;Wallace, Heather A.;Freeman, Tanner J.;Beauchamp, R. Daniel;Lee, Laura A.;Lee, Ethan

文献摘要

参考文献

被引文献

相似文献

Wnt信号传导中的一个关键事件是TCF/Lef从转录阻遏物转化为激活物,但这种转换如何发生还不清楚。在这里,我们报告了一个意想不到的作用,X-连锁细胞凋亡抑制剂(XIAP)在调节这一关键的Wnt信号转导事件是独立的抗凋亡功能。我们在基于果蝇S2细胞的RNAi筛选中将DIAP 1鉴定为Wingless信号传导的正调节因子。XIAP,其脊椎动物同源物,同样需要在培养的哺乳动物细胞和非洲爪蟾胚胎中的Wnt信号,表明功能的进化保守。在Wnt途径激活后,XIAP被募集到TCF/Lef,在那里它单泛素化Groucho(Gro)/TLE。这种修饰降低了Gro/TLE对TCF/Lef的亲和力。我们的数据揭示了一个转录开关,涉及XIAP介导的Gro/TLE泛素化,促进其从TCF/Lef中去除,从而允许β-连环蛋白-TCF/Lef复合物组装和启动Wnt特异性转录程序。
A key event in Wnt signaling is conversion of TCF/Lef from a transcriptional repressor to an activator, yet how this switch occurs is not well understood. Here, we report an unanticipated role for X-linked Inhibitor of Apoptosis (XIAP) in regulating this critical Wnt signaling event that is independent of its anti-apoptotic function. We identified DIAP1 as a positive regulator of Wingless signaling in a Drosophila S2 cell-based RNAi screen. XIAP, its vertebrate homolog, is similarly required for Wnt signaling in cultured mammalian cells and in Xenopus embryos, indicating evolutionary conservation of function. Upon Wnt pathway activation, XIAP is recruited to TCF/Lef where it mono-ubiquitylates Groucho(Gro)/TLE. This modification decreases affinity of Gro/TLE for TCF/Lef. Our data reveal a transcriptional switch involving XIAP-mediated ubiquitylation of Gro/TLE that facilitates its removal from TCF/Lef, thus allowing β-catenin-TCF/Lef complex assembly and initiation of a Wnt-specific transcriptional program.
DOI: 10.1016/j.molcel.2006.04.024
发表时间: 2006-06-09
期刊: MOLECULAR CELL
影响因子: 16
作者:
Jennings, Barbara H.;Pickles, Laura M.;Ish-Horowicz, David
通讯作者: Ish-Horowicz, David
DOI: 10.1038/ncb1381
发表时间: 2006-04-01
影响因子: 21.3
作者:
Angers, S;Thorpe, CJ;Moon, RT
通讯作者: Moon, RT
DOI: 10.1128/mcb.17.5.2679
发表时间: 1997-05-01
影响因子: 5.3
作者:
Minoguchi, S;Taniguchi, Y;Honjo, T
通讯作者: Honjo, T
DOI: 10.1016/j.cell.2008.10.051
发表时间: 2009-01-09
期刊: CELL
影响因子: 64.5
作者:
Dupont, Sirio;Mamidi, Anant;Piccolo, Stefano
通讯作者: Piccolo, Stefano
DOI: 10.1016/0092-8674(89)90506-0
发表时间: 1989-09-22
期刊: CELL
影响因子: 64.5
作者:
MCMAHON, AP;MOON, RT
通讯作者: MOON, RT