Detection of ligand-induced CNTF receptor dimers in living cells by fluorescence cross correlation spectroscopy.
Detection of ligand-induced CNTF receptor dimers in living cells by fluorescence cross correlation spectroscopy.
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通过荧光互相关光谱检测活细胞中配体诱导的 CNTF 受体二聚体。
DOI:
10.1016/j.bbamem.2009.05.013
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
L. Graeve
中科院分区:
文献类型:
--
作者:
Felix Neugart;Andrea Zappe;Deborah M. Buk;I. Ziegler;S. Steinert;Monika Schumacher;Eva Schopf;Ralph Bessey;K. Wurster;C. Tietz;M. Börsch;J. Wrachtrup;L. Graeve
Ciliary neurotrophic factor (CNTF) signals via a receptor complex consisting of the specific CNTF receptor (CNTFR) and two promiscuous signal transducers, gp130 and leukemia inhibitory factor receptor (LIFR). Whereas earlier studies suggested that the signaling complex is a hexamer, more recent analyses strongly support a tetrameric structure. However, all studies so far analyzed the stoichiometry of the CNTF receptor complex in vitro and not in the context of living cells. We generated and expressed in mammalian cells acyl carrier protein-tagged versions of both CNTF and CNTFR. After labeling CNTF and CNTFR with different dyes we analyzed their diffusion behavior at the cell surface. Fluorescence (cross) correlation spectroscopy (FCS/FCCS) measurements reveal that CNTFR diffuses with a diffusion constant of about 2×10−9cm2s−1independent of whether CNTF is bound or not. FCS and FCCS measurements detect the formation of receptor complexes containing at least two CNTFs and CNTFRs. In addition, we measured Förster-type fluorescence resonance energy transfer between two differently labeled CNTFs within a receptor complex indicating a distance of 5–7 nm between the two. These findings are not consistent with a tetrameric structure of the CNTFR complex suggesting that either hexamers and or even higher-order structures (e.g. an octamer containing two tetramers) are formed.
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影响因子:
3.9
作者:
Santhanam,U;Ghrayeb,J;Sehgal,PB;May,LT
通讯作者:
May,LT
影响因子:
16
作者:
Skiniotis, Georgios;Lupardus, Patrick J.;Martick, Monika;Walz, Thomas;Garcia, K. Christopher
通讯作者:
Garcia, K. Christopher
影响因子:
--
作者:
Rodriguez-Boulan,E;Salas,PJ;Sargiacomo,M;Lisanti,M;Lebivic,A;Sambuy,Y;Vega-Salas,D;Graeve,L
通讯作者:
Graeve,L
影响因子:
29.7
作者:
Wang X;Lupardus P;Laporte SL;Garcia KC
通讯作者:
Garcia KC
DOI:
10.1016/s1357-2725(99)00075-8
发表时间:
1999
期刊:
The international journal of biochemistry & cell biology
影响因子:
--
作者:
Watowich,SS
通讯作者:
Watowich,SS