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:
影响因子:
--
通讯作者:
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
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
作者:
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通讯作者:
K. Fuson;Liang Ma;R B Sutton;A. Oberhauser
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10.1529/biophysj.105.079988
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