Smoothened adopts multiple active and inactive conformations capable of trafficking to the primary cilium.

Smoothened adopts multiple active and inactive conformations capable of trafficking to the primary cilium.
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DOI:
10.1371/journal.pone.0005182
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发表时间:
2009
期刊:
影响因子:
3.7
通讯作者:
Chuang PT
Chuang PT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wilson CW;Chen MH;Chuang PT

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Hedgehog(Hh)信号传导的激活需要跨膜蛋白Smoothened(Smo),其为G蛋白偶联受体超家族的成员。在哺乳动物中,Smo在Hh配体与其受体Patched(Ptch 1)结合后易位至初级纤毛,但尚不清楚Smo的纤毛运输是否足以激活通路。在这里,我们表明,环巴胺和jervine,两个结构相关的抑制剂的Smo,力纤毛易位的Smo。用SANT-1(一种无关的Smo拮抗剂)治疗可消除环巴胺和jervine介导的Smo易位。此外,蛋白激酶A的激活(直接或通过Gαs的激活)导致Smo移位到初级纤毛的近端区域。我们建议,Smo采用多种非活性和活性构象,影响其定位和运输的初级纤毛。
Activation of Hedgehog (Hh) signaling requires the transmembrane protein Smoothened (Smo), a member of the G-protein coupled receptor superfamily. In mammals, Smo translocates to the primary cilium upon binding of Hh ligands to their receptor, Patched (Ptch1), but it is unclear if ciliary trafficking of Smo is sufficient for pathway activation. Here, we demonstrate that cyclopamine and jervine, two structurally related inhibitors of Smo, force ciliary translocation of Smo. Treatment with SANT-1, an unrelated Smo antagonist, abrogates cyclopamine- and jervine-mediated Smo translocation. Further, activation of protein kinase A, either directly or through activation of Gαs, causes Smo to translocate to a proximal region of the primary cilium. We propose that Smo adopts multiple inactive and active conformations, which influence its localization and trafficking on the primary cilium.
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