NMR characterization of copper and lipid interactions of the C2B domain of synaptotagmin I-relevance to the non-classical secretion of the human acidic fibroblast growth factor (hFGF-1).

NMR characterization of copper and lipid interactions of the C2B domain of synaptotagmin I-relevance to the non-classical secretion of the human acidic fibroblast growth factor (hFGF-1).
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突触结合蛋白 I 的 C2B 结构域的铜和脂质相互作用的 NMR 表征与人酸性成纤维细胞生长因子 (hFGF-1) 的非经典分泌相关。

DOI:
10.1016/j.bbamem.2009.09.024
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发表时间:
2010
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Kumar,ThallapuranamKrishnaswamySuresh
Kumar,ThallapuranamKrishnaswamySuresh
中科院分区:
--
文献类型:
--
作者:
Kathir,KaruppananMuthusamy;Gao,Li;Rajalingam,Dakshinamurthy;Daily,AnnaE;Brixey,Sherri;Liu,Huimin;Davis,Dan;Adams,Paul;Prudovsky,Igor;Kumar,ThallapuranamKrishnaswamySuresh

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人成纤维细胞生长因子(hFGF-1)是一种分子量约为17 kDa的肝素结合细胞因子。它缺乏常规的疏水性N-末端信号序列,并通过非经典分泌途径分泌。在应激下,hFGF-1作为由hFGF-1、S100 A13(钙结合蛋白)和p40突触结合蛋白(Syt 1)组成的多蛋白复合物释放。铜(Cu 2+)被证明是形成多蛋白hFGF-1释放复合物所必需的(Landriscina等,2001; Di Serio等,2008年)。Syt 1含有脂质结合C2B结构域,被认为在最终输出hFGF-1穿过脂质双层中起重要作用。在这项研究中,我们使用多维NMR光谱表征C2B结构域的Syt 1的Cu 2+和脂质的相互作用。结果突出了Cu 2+似乎如何稳定与pS囊泡结合的蛋白质。利用2D 1H-15 N异质结单量子相干实验绘制的Cu ~(2+)与脂质结合界面表明,β链I上的残基是C_2B结构域中唯一的Cu ~(2+)结合位点。在不存在金属离子的情况下,位于环II和β-链IV中的残基有助于与单层pS囊泡结合。在Cu 2+的存在下,位于环I和III中的另外的残基似乎稳定蛋白质-脂质相互作用。本研究的结果为理解铜离子诱导hFGF-1非经典分泌的分子机制提供了有价值的信息。
Human fibroblast growth factor (hFGF-1) is a ∼17 kDa heparin binding cytokine. It lacks the conventional hydrophobic N-terminal signal sequence and is secreted through non-classical secretion routes. Under stress, hFGF-1 is released as a multiprotein complex consisting of hFGF-1, S100A13 (a calcium binding protein), and p40 synaptotagmin (Syt1). Copper (Cu2+) is shown to be required for the formation of the multiprotein hFGF-1 release complex (Landriscina et al. ,2001; Di Serio et al., 2008). Syt1, containing the lipid binding C2B domain, is believed to play an important role in the eventual export of the hFGF-1 across the lipid bilayer. In this study, we characterize Cu2+and lipid interactions of the C2B domain of Syt1 using multidimensional NMR spectroscopy. The results highlight how Cu2+appears to stabilize the protein bound to pS vesicles. Cu2+and lipid binding interface mapped using 2D1H–15N heteronuclear single quantum coherence experiments reveal that residues in β-strand I contributes to the unique Cu2+binding site in the C2B domain. In the absence of metal ions, residues located in Loop II and β-strand IV contribute to binding to unilamelar pS vesicles. In the presence of Cu2+, additional residues located in Loops I and III appear to stabilize the protein-lipid interactions. The results of this study provide valuable information towards understanding the molecular mechanism of the Cu2+-induced non-classical secretion of hFGF-1.
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影响因子: 3.4
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