Structural insight into Wnt signaling inhibition by Clostridium difficile toxin B.

Structural insight into Wnt signaling inhibition by Clostridium difficile toxin B.
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艰难梭菌毒素B对Wnt信号传导抑制的结构洞察力B。

DOI:
10.1111/febs.14681
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发表时间:
2019-03
期刊:
The FEBS journal
影响因子:
--
通讯作者:
Jin R
Jin R
中科院分区:
其他
文献类型:
--
作者:
Chen P;Tao L;Liu Z;Dong M;Jin R

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艰难梭菌感染(CDI)的发病率在全球范围内显著增加,导致大量的发病率和死亡率。主要毒力因子之一TcdB通过人卷曲蛋白(FZD)进入结肠上皮,所述人卷曲蛋白是Wnt形态发生素的生理受体。TcdB与FZD的结合抑制Wnt信号传导,这可能有助于CDI的发病机制。在这里,我们回顾了TcdB利用识别FZD进入细胞和抑制Wnt信号传导的结构机制,这揭示了调节Wnt信号传导用于治疗干预的新策略。TcdBFBD-CRD 2复合物的整体结构。TcdB使用内源性棕榈油酸(PAM)作为识别FZD的共受体,所述PAM占据FZD上Wnt加合的PAM的结合位点。TcdB结合将这种脂质锁定在适当的位置,从而阻止Wnt与FZD和信号传导结合。
The incidence of Clostridium difficile infection (CDI) has increased significantly worldwide, causing substantial morbidity and mortality. One of the major virulence factor, TcdB, manages to enter the colonic epithelia via the human frizzled proteins (FZDs), which are physiological receptors for Wnt morphogens. Binding of TcdB to FZDs inhibits Wnt signaling, which may contribute to pathogenesis of CDI. Here, we review the structural mechanism by which TcdB exploits to recognize FZDs for cell entry and inhibiting Wnt signaling, which reveals new strategies to modulate Wnt signaling for therapeutic interventions. Overall structure of the TcdBFBD-CRD2 complex. TcdB uses an endogenous palmitoleic acid (PAM), which occupies the binding site for Wnt-adducted PAM on FZDs, as a co-receptor to recognize FZD. TcdB binding locks this lipid in place, thereby preventing Wnt from engaging FZDs and signaling.
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