Structural insights into the role of the Smoothened cysteine-rich domain in Hedgehog signalling.

Structural insights into the role of the Smoothened cysteine-rich domain in Hedgehog signalling.
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对平滑半胱氨酸域在刺猬信号传导中的作用的结构见解。

DOI:
10.1038/ncomms3965
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发表时间:
2013
影响因子:
16.6
通讯作者:
Zheng, Jie J.
Zheng, Jie J.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Rana, Rajashree;Carroll, Candace E.;Lee, Ho-Jin;Bao, Ju;Marada, Suresh;Grace, Christy R. R.;Guibao, Cristina D.;Ogden, Stacey K.;Zheng, Jie J.

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Smoothened(Smo)是G蛋白偶联受体(GPCRs)卷曲(FzD)类的成员,并且作为Hedgehog(Hh)信号传导途径中的关键转导子起作用。Smo具有细胞外富含半胱氨酸的结构域(CRD),其功能和下游Hh信号传导不可或缺。尽管它的重要作用,CRD的Smo信号的功能性贡献尚未明确阐明。然而,鉴于FzD CRD结合内源性Wnt配体,已经提出Smo CRD可以结合其自身的内源性配体。在这里,我们提出了果蝇Smo CRD的NMR溶液结构,并描述糖皮质激素布地奈德(Bud)之间的相互作用和Smo CRD从果蝇和人类。我们的研究结果突出了Smo CRD的功能,证明了其在结合小分子调节剂中的作用。
Smoothened (Smo) is a member of the Frizzled (FzD) class of G-protein-coupled-receptors (GPCRs), and functions as the key transducer in the Hedgehog (Hh) signalling pathway. Smo has an extracellular cysteine-rich domain (CRD), indispensable for its function and downstream Hh signalling. Despite its essential role, the functional contribution of the CRD to Smo signalling has not been clearly elucidated. However, given that the FzD CRD binds to the endogenous Wnt ligand, it has been proposed that the Smo CRD may bind its own endogenous ligand. Here we present the NMR solution structure of the Drosophila Smo CRD, and describe interactions between the glucocorticoid budesonide (Bud) and the Smo CRDs from both Drosophila and human. Our results highlight a function of the Smo CRD, demonstrating its role in binding to small molecule modulators.
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