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Crystal structure of fibroblast growth factor receptor ectodomain bound to ligand and heparin

机译:与配体和肝素结合的成纤维细胞生长因子受体胞外域的晶体结构

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Fibroblast growth factors (FGFs) are a large family of structurally related proteins with a wide range of physiological and pathological activities'. Signal transduction requires association of FGF with its receptor tyrosine kinase (FGFR) and heparan sulphate proteoglycan in a specific complex on the cell surface. Direct involvement of the heparan sulphate glycosaminoglycan polysac-charide in the molecular association between FGF and its receptor is essential for biological activity. Although crystal structures of binary complexes of FGF-heparin and FGF-FGFR have been described, the molecular architecture of the FGF signalling complex has not been elucidated. Here we report the crystal structure of the FGFR2 ectodomain in a dimeric form that is induced by simultaneous binding to FGF1 and a heparin decasaccharide. The complex is assembled around a central heparin molecule linking two FGF1 ligands into a dimer that bridges between two receptor chains. The asymmetric heparin binding involves contacts with both FGF1 molecules but only one receptor chain. The structure of the FGF1-FGFR2-heparin ternary complex provides a structural basis for the essential role of heparan sulphate in FGF signalling.
机译:成纤维细胞生长因子(FGFs)是一大类结构相关的蛋白质,具有广泛的生理和病理活性。信号转导需要FGF与细胞表面特定复合物中的受体酪氨酸激酶(FGFR)和硫酸乙酰肝素蛋白聚糖结合。硫酸乙酰肝素糖胺聚糖多糖直接参与FGF及其受体之间的分子缔合对于生物学活性至关重要。尽管已经描述了FGF-肝素和FGF-FGFR的二元复合物的晶体结构,但尚未阐明FGF信号复合物的分子结构。在这里,我们报告了由二聚体形式的FGFR2胞外域的晶体结构,该结构是通过同时结合FGF1和肝素十糖而诱导的。该复合物围绕将两个FGF1配体连接到桥接两个受体链之间的二聚体的中央肝素分子组装而成。肝素的不对称结合涉及与两个FGF1分子的接触,但仅与一个受体链接触。 FGF1-FGFR2-肝素三元复合物的结构为硫酸乙酰肝素在FGF信号传导中的重要作用提供了结构基础。

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